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Optimum Technology Matching® Applied
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InGaP HBT
GaAs MESFET
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Si BJT
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Functional Block Diagram
RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trade-
mark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc.
Product Description
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Ordering Information
1
2
3 4
6
5
8 7
Logic
Control
RF IN
GND
VREF
GAIN
SELECT
GND
RF OUT
NC
NC
RF2374
3V LOW NOISE AMPLIFIER
The RF2374 is a switchable low noise amplifier with a high dynamic range
designed for digital cellular and WLAN applications. The device functions
as an outstanding front end low noise amplifier with ICC as low as 3mA.
The bias current may be set externally. The IC is featured in a
2mmx2mmx0.6mm module-compatible plastic package.
Features
Low Noise and High Intercept
Point
Adjustable Bias Current
Power Down Control
Low Insertion Loss Bypass
Feature
1.8V to 4V Operation (See
Note: Page 2)
800MHz to 3.8GHz Opera-
tion
ESD Class 1B
Applications
WLAN LNA with Bypass Fea-
ture
CDMA PCS LNA with Bypass
Feature
GPS LNA with Bypass Feature
General Purpose Amplifica-
tion
WiMAX LNA with Bypass Func-
tion
CDMA 800 LNA
RF2374 3V Low Noise Amplifier
RF2374 PCBA-410 Fully Assembled Evaluation Board, 2.3GHz to 3.8GHz with
standard tune
RF2374 PCBA-411 Fully Assembled Evaluation Board, 1.5GHz to 2.2GHz with
standard tune
Rev A0 DS070705
9
RoHS Compliant & Pb-Free Product
Package Style: QFN, 8-Pin, 2mmx2mmx0.6mm
2 of 8
RF2374
Rev A0 DS070705
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Absolute Maximum Ratings
Parameter Rating Unit
Supply Voltage -0.5 to +6.0 VDC
Input RF Level +5 (see note) dBm
Current Drain, ICC 32 mA
Operating Ambient Temperature -40 to +85 °C
Storage Temperature -40 to +150 °C
NOTE: Exceeding any one or a combination of the above maximum rating lim-
its may cause permanent damage. Input RF transients to +15dBm will not
harm the device. For sustained operation at inputs >+5dBm, a small dropping
resistor is recommended in series with the VCC in order to limit the current due
to self-biasing to <32mA.
Parameter Specification Unit Condition
Min. Typ. Max.
Operating Range TAMB =+25°C, VCC=3.0V
Frequency Range 800 4000 MHz
WLAN Low Noise Amplifier
Frequency 2450 MHz
HIGH GAIN MODE Gain Select<0.8V, VREF =3V, T=+25°C
Gain 13.5 14.5 dB
Noise Figure 1.3 1.5 dB
Input IP3 +7 +9 dBm IIP3 will improve if ICC is raised above 7mA.
IP1dB 0 dBm
Current Drain 7 mA
BYPASS MODE (Low Gain) Gain Select>1.8V
Gain -4.0 -3.0 -2.0 dB Note: Bypass mode insertion loss will degrade
gradually as VCC goes below 2.7V.
Input IP3 +19 +21 dBm
Current Drain 2.0 3.0 mA
GPS Low Noise Amplifier
Frequency 1575 MHz
Gain 17.5 dB ICC =7mA
Noise Figure 1.0 dB
Input IP3 +7.0 dBm
WiMAX Low Noise Amplifier
Frequency 3500 MHz ICC =7mA
Gain 11.0 dB At 3500MHz
Noise Figure 1.6 dB At 3500MHz
Input IP3 +10.0 dBm IIP3 will improve if ICC is raised above 7mA.
CDMA Low Noise Amplifier
HIGH GAIN MODE
Frequency 869 894 MHz
Gain 19 dB
Noise Figure 1.0 dB
Input IP3 +2.0 dBm IIP3 will improve if ICC is raised above 7mA.
Current Drain 7 mA
Caution! ESD sensitive device.
The information in this publication is believed to be accurate and reliable. How-
ever, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use,
nor for any infringement of patents, or other rights of third parties, resulting
from its use. No license is granted by implication or otherwise under any patent
or patent rights of RFMD. RFMD reserves the right to change component cir-
cuitry, recommended application circuitry and specifications at any time without
prior notice.
RoHS status based on EUDirective2002/95/EC (at time of this document revi-
sion).
3 of 8
RF2374
Rev A0 DS070705
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Parameter Specification Unit Condition
Min. Typ. Max.
Power Supply
Voltage (VCC)3V
Gain Select Low 0.8 V High Gain mode.
Gain Select<0.8V, VREF=3V
Gain Select High 1.8 V Low Gain mode.
Gain Select>1.8V, VREF =0V
Power Down 0 5 μAGain Select<0.8V, V
REF=0V, VCC =3.0V
Bias note: Due to the presence of ESD protection circuitry on the RF2374, the maximum allowable collector bias voltage (pin 6) is 4.0V. Higher
supply voltages such as 5V are permissible if a series resistor is used to drop VCC to <4.0V for a given ICC.
4 of 8
RF2374
Rev A0 DS070705
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Package Drawing
Pin Function Description Interface Schematic
1RF IN
RF input pin. This part is designed such that 50Ω is the optimal source
impedance for best noise figure. Best noise figure is achieved with only a
series capacitor on the input.
2GND1
Ground connection. For best performance, keep traces physically short
and connect immediately to ground plane.
3VREF
For low noise amplifier applications, this pin is used to control the bias cur-
rent. An external resistor can be used to set the bias current for any VBIAS
voltage. This device will have good gain and noise figure with ICC as low as
3mA.
4GAIN SELECT
This pin selects high gain and bypass modes.
Gain Select<0.8V, high gain.
Gain Select>1.8V, low gain.
5GND2
See GND1.
6RF OUT
Amplifier output pin. This pin is an open-collector output. It must be biased
to VCC through a choke or matching inductor.
7NC
Not connected.
8NC
Not connected.
Pkg
Gnd
GND This pad should be connected to the ground plane by vias directly under
the device.
RF IN RF OUT
To Bias
Circuit
VREF
Dimensions in mm.
Shaded lead is pin 1.
2.20
2.20
INDEX
AREA
B
A
2 PLCS
0.10 C
2 PLCS
0.10 C
C
SEATING
PLANE
0.05
0.00
0.152
REF
0.63
0.53
0.10
MAX
CAB0.10 M
0.31
0.21
0.65
0.28
0.18
1.20
1.00TYP
5 of 8
RF2374
Rev A0 DS070705
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Evaluation Board Schematic
WiBRO/WLAN/WiMAX (2.3GHz to 3.8GHz)
Evaluation Board Schematic
GPS/PCS (1.5GHz to 2.2GHz)
1
2
3 4
6
5
8 7
C1
22 nF
J1
RF IN
R1
1.8 kΩ
VREF GAIN SELECT
L1
1.5 nH
C2
DNP C3
1.5 pF
J2
RF OUT
C4
100 pF
C5
10 nF
VCC
P1-1 VCC
P1-4 VREF
P1-3 GAIN SELECT
GND
P1
1
2
3
4
CON4
50 Ω μstrip 50 Ω μstrip
1
2
3 4
6
5
8 7
C1
22 nF
J1
RF IN
R1
1.8 kΩ
VREF GAIN SELECT
L1
3.3 nH
C2
DNP C3
1.8 pF
J2
RF OUT
C4
100 pF
C5
10 nF
P1-1 VCC
P1-4 VREF
P1-3 GAIN SELECT
GND
P1
1
2
3
4
CON4
50 Ω μstrip 50 Ω μstrip
VCC
6 of 8
RF2374
Rev A0 DS070705
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Evaluation Board Schematic - 869MHz to 894MHz
1
2
3 4
6
5
8 7
C1
22 nF
J1
RF IN
R1
1.8 kΩ
VREF GAIN SELECT
L1
3.9 nH
C2
3.9 pF
C3
10 pF J2
RF OUT
C4
100 pF
C5
10 nF
VCC
P1-1 VCC
P1-4 VREF
P1-3 GAIN SELECT
GND
P1
1
2
3
4
CON4
50 Ω μstrip 50 Ω μstrip
7 of 8
RF2374
Rev A0 DS070705
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Evaluation Board Layout
Board Size 0.835” x 0.900”
Board Thickness 0.032”, Board Material FR-4
8 of 8
RF2374
Rev A0 DS070705
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
