2.7 V to 5.5 V, <100 μA, 8-/10-/12-Bit
nano
DAC
™
with I
2
C-Compatible Interface, Tiny SC70 Package
AD5602/AD5612/AD5622
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.
FEATURES
Single 8-/10-/12-bit DAC, 2 LSB INL
6-lead SC70 package
Micropower operation: max 100 μA @ 5 V
Power-down to <150 nA @ 3 V
2.7 V to 5.5 V power supply
Guaranteed monotonic by design
Power-on reset to 0 V with brownout detection
3 power-down functions
I2C®-compatible serial interface supports standard (100 kHz),
fast (400 kHz), and high speed (3.4 MHz) modes
On-chip output buffer amplifier, rail-to-rail operation
APPLICATIONS
Process control
Data acquisition systems
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
FUNCTIONAL BLOCK DIAGRAM
AD5602/AD5612/AD5622
V
DD
V
OU
T
GND
POWER-ON
RESET
DAC
REGISTER 8-/10-/12-BIT
DAC
INPUT
CONTROL
LOGIC
POWER-DOWN
CONTROL LOGIC
OUTPUT
BUFFER
RESISTOR
NETWORK
REF(+)
SCL SDA
05446-001
ADDR
Figure 1.
Table 1. Related Devices
Part No. Description
AD5601/AD5611/AD5621 2.7 V to 5.5 V, <100 μA, 8-/10-/12-bit
nanoDAC D/A with SPI® interface in
a tiny SC70 package
GENERAL DESCRIPTION
The AD5602/AD5612/AD5622, members of the nanoDAC
family, are single, 8-/10-/12-bit buffered voltage-out DACs that
operate from a single 2.7 V to 5.5 V supply, consuming <100 μA
at 5 V. These DACs come in tiny SC70 packages. Each DAC
contains an on-chip precision output amplifier that allows rail-
to-rail output swing to be achieved.
The AD5602/AD5612/AD5622 use a 2-wire I2C-compatible
serial interface that operates in standard (100 kHz), fast
(400 kHz), and high speed (3.4 MHz) modes.
The references for AD5602/AD5612/AD5622 are derived from
the power supply inputs to give the widest dynamic output range.
Each part incorporates a power-on reset circuit that ensures the
DAC output powers up to 0 V and remains there until a valid
write takes place to the device. The parts contain a power-down
feature that reduces the current consumption of the devices to
<100 nA at 3 V and provides software-selectable output loads
while in power-down mode. The parts are put into power-down
mode over the serial interface. The low power consumption of
the AD5602/AD5612/AD5622 in normal operation makes them
ideally suited for use in portable battery-operated equipment. The
typical power consumption is 0.4 mW at 5 V.
PRODUCT HIGHLIGHTS
1. Available in 6-lead SC70.
2. Maximum 100 μA power consumption, single-supply
operation. These parts operate from a single 2.7 V to 5.5 V
supply typically consuming 0.2 mW at 3 V and 0.4 mW at
5 V, making them ideal for battery-powered applications.
3. The on-chip output buffer amplifier allows the output of
the DAC to swing rail-to-rail with a typical slew rate of
0.5 V/μs.
4. Reference derived from the power supply.
5. Standard, fast, and high speed mode I2C interface.
6. Designed for very low power consumption.
7. Power-down capability. When powered down, the DAC
typically consumes <150 nA at 3 V.
8. Power-on reset and brownout detection.
AD5602/AD5612/AD5622
Rev. 0 | Page 2 of 24
TABLE OF CONTENTS
Specifications..................................................................................... 3
I2C Timing Specifications............................................................ 4
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Ter mi no log y .................................................................................... 14
Theory of Operation ...................................................................... 15
D/A Section................................................................................. 15
Resistor String............................................................................. 15
Output Amplifier........................................................................ 15
Serial Interface ................................................................................ 16
Input Register.............................................................................. 16
Power-On Reset .......................................................................... 17
Power-Down Modes .................................................................. 17
Write Operation.......................................................................... 18
Read Operation........................................................................... 19
High Speed Mode....................................................................... 20
Applications..................................................................................... 21
Choosing a Reference as Power Supply................................... 21
Bipolar Operation....................................................................... 21
Power Supply Bypassing and Grounding................................ 21
Outline Dimensions ....................................................................... 22
Ordering Guide .......................................................................... 22
REVISION HISTORY
6/05—Revision 0: Initial Version
AD5602/AD5612/AD5622
Rev. 0 | Page 3 of 24
SPECIFICATIONS
VDD = 2.7 V to 5.5 V, RL = 2 kΩ to GND, CL = 200 pF to GND; all specifications TMIN to TMAX, unless otherwise noted.
Table 2.
A, B, W, Y Versions1
Parameter Min Typ Max Unit Test Conditions/Comments
STATIC PERFORMANCE DAC output unloaded
Resolution Bits
AD5602 8
AD5612 10
AD5622 12
Relative Accuracy2
AD5602 ±0.5 LSB B, Y versions
AD5612 ±0.5 LSB B, Y versions
±4 LSB A version
AD5622 ±2 LSB B, Y versions
±6 LSB A, W versions
Differential Nonlinearity2 ±1 LSB Guaranteed monotonic by design
Zero Code Error 0.5 10 mV All 0s loaded to DAC register
Offset Error ±0.063 ±10 mV
Full-Scale Error 0.5 mV All 1s loaded to DAC register
Gain Error ±0.0004 ±0.037 % of FSR
Zero Code Error Drift 5 μV/°C
Gain Temperature Coefficient 2 ppm of FSR/°C
OUTPUT CHARACTERISTICS3
Output Voltage Range 0 VDD V
Output Voltage Settling Time 6 10 μs Code ¼ to ¾
Slew Rate 0.5 V/μs
Capacitive Load Stability 470 pF RL = ∞
1000 pF RL = 2 kΩ
Output Noise Spectral Density 120 nV/Hz DAC code = midscale, 10 kHz
Noise 2
DAC code = midscale, 0.1 Hz to 10 Hz
bandwidth
Digital-to-Analog Glitch Impulse 5 nV-s 1 LSB change around major carry
Digital Feedthrough 0.2 nV-s
DC Output Impedance 0.5 Ω
Short Circuit Current 15 mA VDD = 3 V/5 V
LOGIC INPUTS (SDA, SCL)
IIN, Input Current ±1 μA
VINL, Input Low Voltage 0.3 × VDD V
VINH, Input High Voltage 0.7 × VDD V
CIN, Pin Capacitance 2 pF
VHYST, Input Hysteresis 0.1 × VDD V
LOGIC OUTPUTS (OPEN DRAIN)
VOL, Output Low Voltage 0.4 V ISINK = 3 mA
0.6 V ISINK = 6 mA
Floating-State Leakage Current ±1 μA
Floating-State Output Capacitance 2 pF
POWER REQUIREMENTS
VDD 2.7 5.5 V
IDD (Normal Mode) DAC active and excluding load current
VDD = 4.5 V to 5.5 V 75 100 μA VIH = VDD and VIL = GND
VDD = 2.7 V to 3.6 V 60 90 μA VIH = VDD and VIL = GND
AD5602/AD5612/AD5622
Rev. 0 | Page 4 of 24
A, B, W, Y Versions1
Parameter Min Typ Max Unit Test Conditions/Comments
IDD (All Power-Down Modes)
VDD = 4.5 V to 5.5 V 0.3 1 μA VIH = VDD and VIL = GND
VDD = 2.7 V to 3.6 V 0.15 1 μA VIH = VDD and VIL = GND
POWER EFFICIENCY
IOUT/IDD 96 % ILOAD = 2 mA, VDD = 5 V
1 Temperature ranges for A, B versions: −40°C to +125°C, typical at 25°C.
2 Linearity calculated using a reduced code range 64 to 4032.
3 Guaranteed by design and characterization, not production tested.
I2C TIMING SPECIFICATIONS
VDD = 2.7 V to 5.5 V; all specifications TMIN to TMAX, fSCL = 3.4 MHz, unless otherwise noted1.
Table 3.
Limit at TMIN, TMAX
Parameter Conditions2Min Max Unit Description
fSCL3Standard mode 100 KHz Serial clock frequency
Fast mode 400 KHz
High speed mode, CB = 100 pF B 3.4 MHz
High speed mode, CB = 400 pF B 1.7 MHz
t1Standard mode 4 μs tHIGH, SCL high time
Fast mode 0.6 μs
High speed mode, CB = 100 pF B60 ns
High speed mode, CB = 400 pF B120 ns
t2Standard mode 4.7 μs tLOW, SCL low time
Fast mode 1.3 μs
High speed mode, CB = 100 pF B160 ns
High speed mode, CB = 400 pF B320 ns
t3Standard mode 250 ns tSU;DAT, data setup time
Fast mode 100 ns
High speed mode 10 ns
t4Standard mode 0 3.45 μs tHD;DAT, data hold time
Fast mode 0 0.9 μs
High speed mode, CB = 100 pF B0 70 ns
High speed mode, CB = 400 pF B0 150 ns
t5Standard mode 4.7 μs tSU;STA, set-up time for a repeated start
Fast mode 0.6 μs condition
High speed mode 160 ns
t6Standard mode 4 μs tHD;STA, hold time (repeated) start condition
Fast mode 0.6 μs
High speed mode 160 ns
t7Standard mode 4.7 μs tBUF, bus free time between a stop and a
Fast mode 1.3 μs start condition
t8Standard mode 4 μs tSU;STO, set up time for a stop condition
Fast mode 0.6 μs
High speed mode 160 ns
t9Standard mode 1000 ns tRDA, rise time of SDA signal
Fast mode 300 ns
High speed mode, CB = 100 pF B10 80 ns
High speed mode, CB = 400 pF B20 160 ns
AD5602/AD5612/AD5622
Rev. 0 | Page 5 of 24
Limit at TMIN, TMAX
Parameter Conditions2Min Max Unit Description
t10 Standard mode 300 ns tFDA, fall time of SDA signal
Fast mode 300 ns
High speed mode, CB = 100 pF B10 80 ns
High speed mode, CB = 400 pF B20 160 ns
t11 Standard mode 1000 ns tRCL, rise time of SCL signal
Fast mode 300 ns
High speed mode, CB = 100 pF B10 40 ns
High speed mode, CB = 400 pF B20 80 ns
t11A Standard mode 1000 ns tRCL1, rise time of SCL signal after a repeated
Fast mode 300 ns start condition and after an acknowledge bit
High speed mode, CB = 100 pF B10 80 ns
High speed mode, CB = 400 pF B20 160 ns
t12 Standard mode 300 ns tFCL, fall time of SCL signal
Fast mode 300 ns
High speed mode, CB = 100 pF B10 40 ns
High speed mode, CB = 400 pF B20 80 ns
tSP4Fast mode 0 50 ns Pulse width of spike suppressed
High speed mode 0 10 ns
1 See Figure 2. High speed mode timing specification applies to the AD5602/AD5612/AD5622-1 only. Standard and fast mode timing specifications apply to both the
AD5602/AD5612/AD5622-1 and AD5602/AD5612/AD5622-2.
2 CB refers to the capacitance on the bus line.
3 The SDA and SCL timing is measured with the input filters enabled. Switching off the input filters improves the transfer rate but has a negative effect on EMC behavior
of the part.
4 Input filtering on both the SCL and SDA inputs suppress noise spikes that are less than 50 ns or 10 ns for fast mode or high speed mode, respectively.
05446-002
SCL
S
D
A
PS S P
t
8
t
6
t
5
t
3
t
10
t
9
t
4
t
6
t
1
t
7
t
2
t
11
t
12
Figure 2. 2-Wire Serial Interface Timing Diagram
AD5602/AD5612/AD5622
Rev. 0 | Page 6 of 24
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 4.
Parameter Rating
VDD to GND –0.3 V to + 7.0 V
Digital Input Voltage to GND –0.3 V to VDD + 0.3 V
VOUT to GND –0.3 V to VDD + 0.3 V
Operating Temperature Range
Extended Automotive (W, Y Versions) –40°C to +125°C
Extended industrial (A, B Versions) −40°C to + 85°C
Storage Temperature Range –65°C to +160°C
Maximum Junction Temperature 150°C
SC70 Package
θJA Thermal Impedance 332°C/W
θJC Thermal Impedance 120°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) 215°C
Infrared (15 sec) 220°C
ESD 2.0 kV
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
AD5602/AD5612/AD5622
Rev. 0 | Page 7 of 24
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADDR
1
SCL
2
SDA
3
V
OUT
6
GND
5
V
DD
4
AD5602/
AD5612/
AD5622
TOP VIEW
(Not to Scale)
05446-003
Figure 3. Pin Configuration
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 ADDR Three-State Address Input. Sets the two least significant bits (Bit A1, Bit A0) of the 7-bit slave address. See Table 6.
2 SCL Serial Clock Line. This is used in conjunction with the SDA line to clock data into or out of the 16-bit input register.
3 SDA Serial Data Line. This is used in conjunction with the SCL line to clock data into or out of the 16-bit input register. It
is a bidirectional, open-drain data line that should be pulled to the supply with an external pull-up resistor.
4 VDD Power Supply Input. These parts can be operated from 2.7 V to 5.5 V, and VDD should be decoupled to GND.
5 GND Ground. The ground reference point for all circuitry on the part.
6 VOUT Analog Output Voltage from the DAC. The output amplifier has rail-to-rail operation.
AD5602/AD5612/AD5622
Rev. 0 | Page 8 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
DAC CODE
INL ERROR (LSB)
1.0
0.8
0.6
0.4
0.2
0
–1.0
–0.8
–0.6
–0.4
–0.2
0 1000500 20001500 350030002500 4000
V
DD
= 5V
T
A
= 25°C
05446-004
Figure 4. Typical AD5622 Integral Nonlinearity Error
DAC CODE
DNL ERROR (LSB)
0.15
0
–0.20
–0.15
–0.10
0.10
–0.05
0.05
0 1000500 20001500 350030002500 4000
V
DD
= 5V
T
A
= 25°C
05446-005
Figure 5. Typical AD5622 Differential Nonlinearity Error
DAC CODE
INL ERROR (LSB)
0.25
0.20
0.15
0.10
0.05
0
–0.25
–0.20
–0.15
–0.10
–0.05
0 400200 600 800 1000
V
DD
= 5V
T
A
= 25°C
05446-047
Figure 6. Typical AD5612 Integral Nonlinearity Error
DAC CODE
DNL ERROR (LSB)
0.05
0.04
0.03
0.02
0.01
0
–0.05
–0.04
–0.03
–0.02
–0.01
0 400200 600 800 1000
V
DD
= 5V
T
A
= 25°C
05446-048
Figure 7. Typical AD5612 Differential Nonlinearity Error
DAC CODE
INL ERROR (LSB)
0.06
0.04
0.02
0
–0.06
–0.04
–0.02
0 10050 150 200 250
V
DD
= 5V
T
A
= 25°C
05446-049
Figure 8. Typical AD5602 Integral Nonlinearity Error
DAC CODE
DNL ERROR (LSB)
0.015
0.010
0.005
0
–0.015
–0.005
–0.010
0 10050 150 200 250
V
DD
= 5V
T
A
= 25°C
05446-050
Figure 9. Typical AD5602 Differential Nonlinearity Error
AD5602/AD5612/AD5622
Rev. 0 | Page 9 of 24
DAC CODE
TUE (LSB)
1
0
–7
–6
–5
–4
–3
–2
–1
0 1000500 20001500 350030002500 4000
V
DD
= 5V
T
A
= 25°C
05446-006
Figure 10. Typical AD5622 Total Unadjusted Error
V
DD
(V)
INL ERROR (LSB)
0.8
0.6
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
2.7 3.2 4.23.7 5.24.7
T
A
= 25°C MAX INL
MIN INL
05446-007
Figure 11. AD5622 INL Error vs. Supply
V
DD
(V)
TUE (LSB)
0
–8
–7
–6
–5
–4
–3
–2
–1
2.7 3.2 4.23.7 5.24.7
T
A
= 25°C
MAX TUE
MIN TUE
05446-008
Figure 12. AD5622 Total Unadjusted Error vs. Supply
V
DD
(V)
DNL ERROR (LSB)
0.5
0.4
0.3
0.2
0.1
0
–0.3
–0.2
–0.1
2.7 3.2 4.23.7 5.24.7
T
A
= 25°C
MAX DNL
MIN DNL
05446-009
Figure 13. AD5622 DNL Error vs. Supply
TEMPERATURE (
°C
)
INL ERROR (LSB)
0.5
0.4
0.3
0.2
0.1
0
–0.3
–0.2
–0.1
–40 0–20 604020 12010080
MAX INL = 5V
MAX INL = 3V
MIN INL = 5V
MIN INL = 3V
05446-010
Figure 14. AD5622 INL Error vs. Temperature (3 V/5 V Supply)
TEMPERATURE (
°C
)
TUE (LSB)
8
7
6
5
4
3
0
1
2
–40 0–20 604020 12010080
MAX TUE = 5V
MAX TUE = 3V
MIN TUE = 5V
MIN TUE = 3V
05446-011
Figure 15. AD5622 Total Unadjusted Error vs. Temperature (3 V/5 V Supply)
AD5602/AD5612/AD5622
Rev. 0 | Page 10 of 24
TEMPERATURE (
°C
)
DNL ERROR (LSB)
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.3
–0.2
–0.1
–40 0–20 604020 12010080
MAX DNL = 5V
MAX DNL = 3V
MIN DNL = 5V
MIN DNL = 3V
05446-012
Figure 16. AD5622 DNL Error vs. Temperature (3 V/5 V Supply)
TEMPERATURE (
°C
)
ERROR (mV)
4
0
2
–2
–4
–8
–10
–6
–40 –20 0 604020 100 12080
ZERO CODE ERROR = 3V
FULL-SCALE ERROR = 3V
FULL-SCALE ERROR = 5V
ZERO CODE ERROR = 5V
05446-013
Figure 17. Zero Code/Full-Scale Error vs. Temperature (3 V/5 V Supply)
V
DD
(
V
)
ERROR (mV)
1
0
–1
–2
–3
–4
–5
–8
–7
–6
2.7 3.2 4.23.7 5.24.7
ZERO CODE ERROR T
A
= 25°C
FULL-SCALE ERROR
05446-014
Figure 18. Zero Code/Full-Scale Error vs. Supply
TEMPERATURE (
°C
)
ERROR (mV)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0
0.2
0.4
–40 0–20 604020 12010080
OFFSET ERROR = 5V
OFFSET ERROR = 3V
05446-015
Figure 19. Offset Error vs. Temperature (3 V/5 V Supply)
TEMPERATURE (
°C
)
ERROR (%FSR)
0.00025
0.00020
0.00015
0.00010
0
0.00005
–40 0–20 604020 12010080
GAIN ERROR = 5V
GAIN ERROR = 3V
05446-016
Figure 20. Gain Error vs. Temperature (3 V/5 V Supply)
0
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
2.7 3.2 3.7 4.2 4.7 5.2
V
DD
(V)
I
DD
(μA)
T
A
= 25°C
0.01
05446-017
Figure 21. Supply Current vs. Supply Voltage
AD5602/AD5612/AD5622
Rev. 0 | Page 11 of 24
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
–40 –20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
I
DD
(μA)
V
DD
= 3V
V
DD
= 5V
05446-018
Figure 22. Supply Current vs. Temperature (3 V/5 V Supply)
0
10
20
30
40
50
60
70
0 2000 4000 6000 8000 10000 12000 14000 16000
DAC CODE
IDD (μA)
VDD = 5V
VDD = 3V
05446-019
T
A
= 25°C
Figure 23. Supply Current vs. Digital Input Code
V
LOGIC
(V)
I
DD
(μA)
900
800
700
600
500
400
0
100
200
300
0 0.5 1.0 2.52.01.5 5.04.54.03.53.0
SCL/SDA DECREASING
V
DD
= 5V
SCL/SDA DECREASING
V
DD
= 3V
SCL/SDA
INCREASING
V
DD
= 3V
SCL/SDA INCREASING
V
DD
= 5V
05446-020
Figure 24. Supply Current vs. SCL/SDA Logic Voltage
0
2
4
6
8
10
12
0.05456
0.05527
0.05599
0.05671
0.05742
0.05814
0.05885
0.06648
0.06710
0.06773
0.06835
0.06897
0.06960
0.07022
0.07084
0.07147
0.07209
0.07271
0.07334
I
DD
(μA)
FREQUENCY
05446-021
V
DD
= 5V
V
IH
= V
DD
V
IL
= GND
T
A
= 25°C
V
DD
= 3V
V
IH
= V
DD
V
IL
= GND
T
A
= 25°C
Figure 25. IDD Histogram (3 V/5 V Supply)
–0.6
–0.4
–0.2
0.0
0.2
0.4
0.6
0.8
–15 –10 –5 0 5 10 15
I(mA)
ΔV
O
(V)
05446-037
DAC LOADED WITH ZERO-SCALE CODE
V
DD
= 5V
T
A
= 25°C
DAC LOADED WITH FULL-SCALE CODE
Figure 26. Sink and Source Capability
CH2
CH1
05446-038
V
DD
= 5V
T
A
= 25°C
V
DD
V
OUT
= 70mV
CH1 = 1V/DIV, CH2 = 20mV/DIV, TIME BASE = 20μs/DIV
Figure 27. Power-On Reset to 0 V
AD5602/AD5612/AD5622
Rev. 0 | Page 12 of 24
CH1 = 5V/DIV, CH2 = 1V/DIV, TIME BASE = 2μs/DIV
CH1
CH2
05446-039
VDD = 5V
TA = 25°C
Figure 28. Exiting Power-Down Mode
CH1 = 5V/DIV, CH2 = 1V/DIV, TIME BASE = 2μs/DIV
CH1
CH2
05446-040
VDD = 5V
TA = 25°C
Figure 29. Full-Scale Settling Time
CH1 = 5V/DIV, CH2 = 1V/DIV, TIME BASE = 2μs/DIV
CH1
CH2
05446-041
VDD = 5V
TA = 25°C
Figure 30. Half-Scale Settling Time
CH1 = 1V/DIV, CH2 = 3V/DIV, TIME BASE = 50μs/DIV
CH2
CH1
05446-042
V
DD
V
OUT
V
DD
= 5V
T
A
= 25°C
Figure 31. VOUT vs. VDD
SAMPLE NUMBER
AMPLITUDE (V)
0 100 200 300 400 500
2.458
2.456
2.454
2.452
2.450
2.448
2.446
2.444
2.442
2.440
2.438
2.436
VDD = 5V
TA = 25°C
LOAD = 2kΩ AND 220pF
CODE 0x800 TO 0x7FF
10ns/SAMPLE NUMBER
05446-043
Figure 32. Digital-to-Analog Glitch Impulse
SAMPLE NUMBER
AMPLITUDE (V)
2.4278
2.4276
2.4274
2.4272
2.4270
2.4268
2.4266
2.4264
2.4262
2.4260 0 200100 300 400 500
05446-044
V
DD
= 5V
T
A
= 25°C
LOAD = 2kΩ AND 220pF
10ns/SAMPLE NUMBER
Figure 33. Digital Feedthrough
AD5602/AD5612/AD5622
Rev. 0 | Page 13 of 24
05446-045
CH1
V
DD
= 5V
T
A
= 25°C
MIDSCALE LOADED
CH1 = 5μV/DIV
05446-046
0
100
200
300
400
500
600
700
100 1000 10000 100000
FREQUENCY (Hz)
OUTPUT NOISE SPECTRAL DENSITY (nV/ Hz)
FULL SCALE
ZERO SCALE
V
DD
= 5V
T
A
= 25°C
UNLOADED OUTPUT
MIDSCALE
Figure 34. 1/f Noise, 0.1 Hz to 10 Hz Bandwidth Figure 35. Noise Spectral Density
AD5602/AD5612/AD5622
Rev. 0 | Page 14 of 24
TERMINOLOGY
Relative Accuracy
For the DAC, relative accuracy or integral nonlinearity (INL) is
a measure of the maximum deviation, in LSBs, from a straight
line passing through the endpoints of the DAC transfer
function. A typical INL vs. code plot can be seen in Figure 4.
Differential Nonlinearity (DNL)
Differential nonlinearity is the difference between the measured
change and the ideal 1 LSB change between any two adjacent
codes. A specified differential nonlinearity of ±1 LSB maximum
ensures monotonicity. This DAC is guaranteed monotonic by
design. A typical DNL vs. code plot can be seen in Figure 5.
Zero-Code Error
Zero-code error is due to a combination of the offset errors in
the DAC and output amplifier; it is a measure of the output
error when zero code (0x0000) is loaded to the DAC register.
Ideally, the output should be 0 V. The zero-code error is always
positive in the AD5602/AD5612/AD5622 because the output of
the DAC cannot go below 0 V. Zero-code error is expressed in
mV. A plot of zero-code error vs. temperature can be seen in
Figure 17.
Full-Scale Error
Full-scale error is a measure, expressed in percent of full-scale
range, of the output error when full-scale code (0xFFFF) is loaded
to the DAC register. Ideally, the output should be VDD – 1 LSB. A
plot of full-scale error vs. temperature can be seen in Figure 17.
Gain Error
Gain error is a measure of the span error of the DAC. It is the
deviation in slope of the DAC transfer characteristic from ideal
expressed as a percent of the full-scale range.
Tota l Un a dju ste d Error ( TUE)
Total unadjusted error is a measure of the output error taking
all the various errors into account. A typical TUE vs. code plot
can be seen in Figure 10.
Zero-Code Error Drift
Zero-code error drift is a measure of the change in zero-code
error with a change in temperature. It is expressed in μV/°C.
Gain Error Drift
Gain error drift is a measure of the change in gain error with
changes in temperature. It is expressed in (ppm of full-scale
range)/°C.
Digital-to-Analog Glitch Impulse
Digital-to-analog glitch impulse is the impulse injected into the
analog output when the input code in the DAC register changes
state. It is normally specified as the area of the glitch in nV secs
and is measured when the digital input code is changed by 1 LSB
at the major carry transition (0x7FFF to 0x8000). See Figure 32.
Digital Feedthrough
Digital feedthrough is a measure of the impulse injected into
the analog output of the DAC from the digital inputs of the DAC,
but is measured when the DAC output is not updated. It is
specified in nV secs and measured with a full-scale code change
on the data bus, that is, from all 0s to all 1s, and vice versa. See
Figure 33.
AD5602/AD5612/AD5622
Rev. 0 | Page 15 of 24
THEORY OF OPERATION
D/A SECTION
The AD5602/AD5612/AD5622 DACs are fabricated on a
CMOS process. The architecture consists of a string DAC
followed by an output buffer amplifier. Figure 36 shows a block
diagram of the DAC architecture.
V
DD
V
OUT
GND
RESISTOR
NETWORK
REF (+)
REF (–)
ٛ
OUTPUT
AMPLIFIER
DAC REGISTER
05446-022
Figure 36. DAC Architecture
Since the input coding to the DAC is straight binary, the ideal
output voltage is given by
⎟
⎠
⎞
⎜
⎝
⎛
×= n
DDOUT D
VV 2
where:
D is the decimal equivalent of the binary code that is loaded to
the DAC register; it can range from 0 to 255 (AD5602), 0 to
1023 (AD5612) or 0 to 4095 (AD5622).
n is the bit resolution of the DAC.
RESISTOR STRING
The resistor string structure is shown in Figure 37. It is simply a
string of resistors, each of value R. The code loaded to the DAC
register determines at which node on the string the voltage is
tapped off to be fed into the output amplifier. The voltage is
tapped off by closing one of the switches connecting the string
to the amplifier. Because it is a string of resistors, it is
guaranteed monotonic.
R
R
R
R
RTO OUTPUT
AMPLIFIER
05446-023
Figure 37. Resistor String Structure
OUTPUT AMPLIFIER
The output buffer amplifier is capable of generating rail-to-rail
voltages on its output, giving an output range of 0 V to VDD. It is
capable of driving a load of 2 kΩ in parallel with 1000 pF to
GND. The source and sink capabilities of the output amplifier
can be seen in Figure 26. The slew rate is 0.5 V/μs with a half-
scale settling time of 5 μs with the output unloaded.
AD5602/AD5612/AD5622
Rev. 0 | Page 16 of 24
SERIAL INTERFACE
The AD5602/AD5612/AD5622 have two-wire I2C-compatible
serial interfaces (refer to I2C-Bus Specification, Version 2.1,
January 2000, available from Philips Semiconductor). The
AD5602/AD5612/AD5622 can be connected to an I2C bus as a
slave device, under the control of a master device. See Figure 2
for a timing diagram of a typical write sequence.
The AD5602/AD5612/AD5622 support standard (100 kHz),
fast (400 kHz), and high speed (3.4 MHz) data transfer modes.
Support is not provided for 10-bit addressing and general call
address.
The AD5602/AD5612/AD5622 each have a 7-bit slave address.
The five MSBs are 00011 and the two LSBs are determined by
the state of the ADDR pin. The facility to make hardwired
changes to ADDR allows the user to incorporate up to three of
these devices on one bus as outlined in Table 6.
The 2-wire serial bus protocol operates as follows:
1. The master initiates data transfer by establishing a start
condition, which is when a high-to-low transition on the
SDA line occurs while SCL is high. The following byte is
the address byte, which consists of the 7-bit slave address.
The slave address corresponding to the transmitted address
responds by pulling SDA low during the ninth clock pulse
(this is termed the acknowledge bit). At this stage, all other
devices on the bus remain idle while the selected device
waits for data to be written to, or read from, its shift register.
2. Data is transmitted over the serial bus in sequences of nine
clock pulses (eight data bits followed by an acknowledge
bit). The transitions on the SDA line must occur during the
low period of SCL and remain stable during the high
period of SCL.
3. When all data bits have been read or written, a stop
condition is established. In write mode, the master pulls
the SDA line high during the 10th clock pulse to establish a
stop condition. In read mode, the master issues a no
acknowledge for the ninth clock pulse (that is, the SDA line
remains high). The master then brings the SDA line low
before the 10th clock pulse, and then high during the 10th
clock pulse to establish a stop condition.
Table 6. Device Address Selection
ADDR A1 A0
GND 1 1
VDD 0 0
NC (No Connection) 1 0
INPUT REGISTER
The input register is 16 bits wide. Figure 38, Figure 39, and
Figure 40 illustrate the contents of the input register for each
part. Data is loaded into the device as a 16-bit word under the
control of a serial clock input, SCL. The timing diagram for this
operation is shown in Figure 2. The 16-bit word consists of four
control bits followed by 8, 10, or 12 bits of data, depending on
the device type. MSB (DB15) is loaded first. The first two bits
are reserved bits that must be set to zero, the next two are
control bits that control the mode of operation of the device
(normal mode or any one of three power-down modes). See the
Power-Down Modes section for a complete description. The
remaining bits are left-justified DAC data bits, starting with the
MSB and ending with the LSB.
DATA BITS
DB15 (MSB) DB0 (LSB)
0 0 PD1 PD0 D7 D6 D5 D4 D3 D2 D1 D0 X X X X
05446-024
Figure 38. AD5602 Input Register Contents
DATA BITS
DB15 (MSB) DB0 (LSB)
0 0 PD1 PD0 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X
05446-025
Figure 39. AD5612 Input Register Contents
DATA BITS
DB15 (MSB) DB0 (LSB)
0 0 PD1 PD0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
05446-026
Figure 40. AD5622 Input Register Contents
AD5602/AD5612/AD5622
Rev. 0 | Page 17 of 24
POWER-ON RESET
The AD5602/AD5612/AD5622 each contain a power-on reset
circuit that controls the output voltage during power-up. The
DAC register is filled with zeros and the output voltage is 0 V
where it remains until a valid write sequence is made to the
DAC. This is useful in applications where it is important to
know the state of the output of the DAC while it is in the
process of powering up.
POWER-DOWN MODES
The AD5602/AD5612/AD5622 each contain four separate
modes of operation. These modes are software-programmable
by setting the bits, PD1 and PD0, in the control register. Table 7
shows how the state of the bits corresponds to the mode of
operation of the device.
Table 7. Modes of Operation
PD1 PD0 Operating Mode
0 0 Normal operation
0 1 Power-down (1 kΩ load to GND)
1 0 Power-down (100 kΩ load to GND)
1 1 Power-down (Three-state output)
When both bits are set to 0, the part works normally with its
usual power consumption of 100 μA maximum at 5 V. However,
for the three power-down modes, the supply current falls to
<150 nA (at 3 V). Not only does the supply current fall, but the
output stage is internally switched from the output of the
amplifier to a resistor network of known values. This gives the
advantage of knowing the output impedance of the part while
the part is in power-down mode. There are three different
options. The output is connected internally to GND through a
1 kΩ resistor, or a 100 kΩ resistor, or is left open-circuited
(three-state). Figure 41 shows the output stage.
POWER-DOWN
CIRCUITRY RESISTOR
NETWORK
V
OUT
RESISTOR
STRING DAC AMPLIFIER
05446-027
Figure 41. Output Stage During Power-Down
The bias generator, the output amplifier, the resistor string, and
other associated linear circuitry are all shut down when the
power-down mode is activated. However, the contents of the
DAC register are unaffected when in power-down. The time to
exit power-down is typically 14 μs for VDD = 5 V and 17 μs for
VDD = 3 V. See Figure 28.
AD5602/AD5612/AD5622
Rev. 0 | Page 18 of 24
WRITE OPERATION
When writing to the AD5602/AD5612/AD5622, the user must
begin with a start command followed by an address byte (R/W =
0), after which the DAC acknowledges that it is prepared to
receive data by pulling SDA low.
Two bytes of data are then written to the DAC, the most
significant byte followed by the least significant byte as shown in
Figure 39; both of these data bytes are acknowledged by the
AD5602/ AD5612/AD5622. A stop condition then follows. The
write operations for the three DACs are shown in Figure 42,
Figure 43, and Figure 44.
05446-028
SCL
SDA
START BY
MASTER ACK. BY
AD5602 ACK. BY
AD5602
ACK. BY
AD5602 STOP BY
MASTER
FRAME 2
MOST SIGNIFICANT DATA BYTE
FRAME 1
SERIAL BUS ADDRESS BYTE
0
19
1
99
91
0 0 1 1 A1 A0 R/W 0 0 PD1 PD0 D7 D6 D5 D4
D3 D2 D1 D0 X X X X
SCL (CONTINUED)
SDA (CONTINUED)
FRAME 3
LEAST SIGNIFICANT DATA BYTE
Figure 42. AD5602 Write Sequence
05446-029
SCL
SDA
START BY
MASTER ACK. BY
AD5612 ACK. BY
AD5612
ACK. BY
AD5612 STOP BY
MASTER
FRAME 2
MOST SIGNIFICANT DATA BYTE
FRAME 1
SERIAL BUS ADDRESS BYTE
0
19
1
99
91
0 0 1 1 A1 A0 R/W 0 0 PD1 PD0 D9 D8 D7 D6
D5 D4 D3 D2 D1 D0 X X
SCL (CONTINUED)
SDA (CONTINUED)
FRAME 3
LEAST SIGNIFICANT DATA BYTE
Figure 43. AD5612 Write Sequence
05446-030
SCL
SDA
START BY
MASTER ACK. BY
AD5622 ACK. BY
AD5622
ACK. BY
AD5622 STOP BY
MASTER
FRAME 2
MOST SIGNIFICANT DATA BYTE
FRAME 1
SERIAL BUS ADDRESS BYTE
0
19
1
99
91
0 0 1 1 A1 A0 R/W 0 0 PD1 PD0 D11 D10 D9 D8
D7 D6 D5 D4 D3 D2 D1 D0
SCL (CONTINUED)
SDA (CONTINUED)
FRAME 3
LEAST SIGNIFICANT DATA BYTE
Figure 44. AD5622 Write Sequence
AD5602/AD5612/AD5622
Rev. 0 | Page 19 of 24
READ OPERATION
When reading data back from the AD5602/AD5612/AD5622,
the user begins with a start command followed by an address
byte (R/W = 1), after which the DAC acknowledges that it is
prepared to transmit data by pulling SDA low. Two bytes of data
are then read from the DAC which are both acknowledged by
the master as shown in Figure 45, Figure 46, and Figure 47. A
stop condition follows.
05446-031
SCL
SDA
START BY
MASTER ACK. BY
AD5602 ACK. BY
MASTER
NO ACK. BY
MASTER STOP BY
MASTER
FRAME 2
MOST SIGNIFICANT DATA BYTE FROM AD5602
FRAME 1
SERIAL BUS ADDRESS BYTE
0
19
19
91
0 0 1 1 A1 A0 R/W PD1 PD0 D7 D6 D5 D4 D3 D2
D1 D0 0 0 0 0 0 0
SCL (CONTINUED)
SDA (CONTINUED)
FRAME 3
LEAST SIGNIFICANT DATA BYTE FROM AD5602
Figure 45. AD5602 Read Sequence
05446-032
SCL
SDA
START BY
MASTER ACK. BY
AD5612 ACK. BY
MASTER
NO ACK. BY
MASTER STOP BY
MASTER
FRAME 2
MOST SIGNIFICANT DATA BYTE FROM AD5612
FRAME 1
SERIAL BUS ADDRESS BYTE
0
19
19
91
0 0 1 1 A1 A0 R/W PD1 PD0 D9 D8 D7 D6 D5 D4
D3 D2 D1 D0 0 0 00
SCL (CONTINUED)
SDA (CONTINUED)
FRAME 3
LEAST SIGNIFICANT DATA BYTE FROM AD5612
Figure 46. AD5612 Read Sequence
05446-033
SCL
SDA
START BY
MASTER ACK. BY
AD5622 ACK. BY
MASTER
NO ACK. BY
MASTER STOP BY
MASTER
FRAME 2
MOST SIGNIFICANT DATA BYTE FROM AD5622
FRAME 1
SERIAL BUS ADDRESS BYTE
0
19
19
91
0 0 1 1 A1 A0 R/W PD1 PD0 D11 D10 D9 D8 D7 D6
D5 D4 D3 D2 D1 D0 00
SCL (CONTINUED)
SDA (CONTINUED)
FRAME 3
LEAST SIGNIFICANT DATA BYTE FROM AD5622
Figure 47. AD5622 Read Sequence
AD5602/AD5612/AD5622
Rev. 0 | Page 20 of 24
HIGH SPEED MODE
High speed mode communication commences after the master
addresses all devices connected to the bus with the Master
Code 00001XXX, to indicate that a high speed mode transfer is
to begin. No device connected to the bus is permitted to
acknowledge the high speed master code, therefore the code is
followed by a no acknowledge. The master must then issue a
repeated start followed by the device address. The selected
device then acknowledges its address. All devices continue to
operate in high speed mode until such time as the master issues
a stop condition. When the stop condition is issued the devices
all return to standard/fast mode.
05446-034
19 91
00001XXX 00011A1A0
START BY
MASTER ACK. BY
AD56x2
NACK. SR
SERIAL BUS ADDRESS BYTEHS-MODE MASTER CODE
HIGH-SPEED MODEFAST MODE
SCL
SDA R/W
Figure 48. Placing the AD5602/AD5612/AD5622 into High Speed Mode
AD5602/AD5612/AD5622
Rev. 0 | Page 21 of 24
APPLICATIONS
CHOOSING A REFERENCE AS POWER SUPPLY
The AD5602/AD5612/AD5622 come in tiny SC70 packages
with less than 100 μA supply current, thereby making the
choice of reference dependent on the application requirement.
For space-saving applications, the ADR425 is available in an
SC70 package with excellent drift at 3ppm/°C. It also provides
very good noise performance at 3.4 μV p-p in the 0.1 Hz to
10 Hz range.
Because the supply current required by the AD5602/AD5612/
AD5622 DACs is extremely low, they are ideal for low supply
applications. The ADR293 voltage reference is recommended in
this case. This requires 15 μA of quiescent current and can
therefore drive multiple DACs in the one system, if required.
AD5602/
AD5612/
AD5622
SCLK
SDIN
7V
5V
V
OUT
= 0V TO 5V
ADR425
05446-035
Figure 49. ADR425 as Power Supply
Examples of some recommended precision references for use as
supplies to the AD5602/AD5612/AD5622 are shown in Table 8.
Table 8. Recommended Precision References
Part
No.
Initial
Accuracy
(mV max)
Temperature
Drift
(ppm/°C max)
0.1 Hz to 10 Hz
Noise (μV p-p typ)
ADR435 ±6 3 3.4
ADR425 ±6 3 3.4
ADR02 ±5 3 15
ADR395 ±6 25 5
BIPOLAR OPERATION
The AD5602/AD5612/AD5622 have been designed for single-
supply operation, but a bipolar output range is also possible
using the circuit in Figure 50. The circuit in Figure 50 gives an
output voltage range of ±5 V. Rail-to-rail operation at the
amplifier output is achievable using an AD820 or an OP295 as
the output amplifier.
The output voltage for any input code can be calculated as
⎥
⎦
⎤
⎢
⎣
⎡⎟
⎠
⎞
⎜
⎝
⎛
×−
⎟
⎠
⎞
⎜
⎝
⎛+
×
⎟
⎠
⎞
⎜
⎝
⎛
×= R1
R2
V
R1R2R1D
VV DD
n
DDO 2
where D represents the input code in decimal and n represents
the bit resolution of the DAC.
With VDD = 5 V, R1 = R2 = 10 kΩ:
V5
2
10 −
⎟
⎠
⎞
⎜
⎝
⎛×
=n
OD
V
This is an output voltage range of ±5 V with 0x000 corresponding
to a −5 V output, and 0xFFF corresponding to a +5 V output.
+5V
–5V
AD820/
OP195
+5V
AD5602/
AD5612/
AD5622
10μF0.1μFV
DD
V
OUT
R1
10kΩ
SDA SCL
R2
10kΩ
+5V
05446-036
Figure 50. Bipolar Operation with the AD5602/AD5612/AD5622
POWER SUPPLY BYPASSING AND GROUNDING
When accuracy is important in a circuit, it is helpful to carefully
consider the power supply and ground return layout on the
board. The printed circuit board containing the
AD5602/AD5612/AD5622 should have separate analog and
digital sections, each having its own area of the board. If the
AD5602, AD5612, or AD5622 is in a system where other
devices require an AGND to DGND connection, the
connection should be made at one point only. This ground
point should be as close as possible to the
AD5602/AD5612/AD5622.
The power supply to the AD5602/AD5612/AD5622 should be
bypassed with 10 μF and 0.1 μF capacitors. The capacitors
should be physically as close as possible to the device with the
0.1 μF capacitor ideally right up against the device. The 10 μF
capacitors are the tantalum bead type. It is important that the
0.1 μF capacitor has low effective series resistance (ESR) and
effective series inductance (ESI), such as common ceramic
types. This 0.1 μF capacitor provides a low impedance path to
ground for high frequencies caused by transient currents due to
internal logic switching.
The power supply line should have as large a trace as possible to
provide a low impedance path and reduce glitch effects on the
supply line. Clocks and other fast switching digital signals
should be shielded from other parts of the board by digital
ground. Avoid crossover of digital and analog signals if possible.
When traces cross on opposite sides of the board, ensure that
they run at right angles to each other to reduce feedthrough
effects through the board. The best board layout technique is
the microstrip technique where the component side of the
board is dedicated to the ground plane only and the signal
traces are placed on the solder side. However, the microstrip
technique is not always possible with a 2-layer board.
AD5602/AD5612/AD5622
Rev. 0 | Page 22 of 24
OUTLINE DIMENSIONS
COMPLIANT TO JEDEC STANDARDS MO-203-AB
0.22
0.08
0.30
0.10
0.30
0.15
1.00
0.90
0.70
SEATING
PLANE
4 5 6
3 2 1
PIN 1 0.65 BSC
1.30 BSC
0.10 MAX
0.10 COPLANARITY
0.40
0.10
1.10
0.80
2.20
2.00
1.80
2.40
2.10
1.80
1.35
1.25
1.15
Figure 51. 6-Lead Plastic Surface Mount Package [SC70]
(KS-6)
Dimensions shown in millimeters
ORDERING GUIDE
Model INL (max)
I2C Interface
Modes Supported
Temperature
Range
Power Supply
Range
Package
Option
Package
Description Branding
AD5602YKSZ-11±0.5 LSB Standard, fast and
high speed
−40°C to +125°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5W
AD5602BKSZ-21±0.5 LSB Standard, fast −40°C to +85°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5X
AD5602YKSZ-21±0.5 LSB Standard, fast −40°C to +125°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5Y
AD5612YKSZ-11±0.5 LSB Standard, fast, and
high speed
−40°C to +125°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5T
AD5612BKSZ-21±0.5 LSB Standard, fast −40°C to +85°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5U
AD5612AKSZ-21±4 LSB Standard, fast −40°C to +85°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D60
AD5612YKSZ-21±0.5 LSB Standard, fast −40°C to +125°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5S
AD5622YKSZ-11±2 LSB Standard, fast, and
high speed
−40°C to +125°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5M
AD5622BKSZ-21±2 LSB Standard, fast −40°C to +85°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5N
AD5622YKSZ-21±2 LSB Standard, fast −40°C to +125°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5P
AD5622WKSZ-11±6 LSB Standard, fast, and
high speed
−40°C to +125°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5Q
AD5622AKSZ-21±6 LSB Standard, fast −40°C to +85°C 2.7 V to 5.5 V KS-6 6-Lead SC70 D5R
1 Z = Pb-free part.
AD5602/AD5612/AD5622
Rev. 0 | Page 23 of 24
NOTES
AD5602/AD5612/AD5622
Rev. 0 | Page 24 of 24
NOTES
Purchase of licensed I2C components of Analog Devices or one of its sublicensed Associated Companies conveys a license for the purchaser under the Philips I2C Patent
Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips.
© 2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05446–0–6/05(0)
