Dual Single-Supply Audio Operational Amplifier SSM2135 PIN CONNECTIONS Excellent sonic characteristics High output drive capability 5.2 nV/Hz equivalent input noise @ 1 kHz 0.003% THD + N (VOUT = 1 V p-p @ 1 kHz) 3.5 MHz gain bandwidth Unity-gain stable Low cost OUT A 1 -IN A 2 8 SSM2135 V+ OUT B TOP VIEW 6 -IN B (Not to Scale) V-/GND 4 5 +IN B +IN A 3 7 00349-002 FEATURES Figure 1. 8-Lead Narrow Body SOIC (R Suffix) APPLICATIONS Multimedia audio systems Microphone preamplifiers Headphone drivers Differential line receivers Balanced line drivers Audio ADC input buffers Audio DAC l-V converters and filters Pseudoground generators GENERAL DESCRIPTION and portable digital audio units, the SSM2135 can perform preamplification, headphone and speaker driving, and balanced line driving and receiving. Additionally, the device is ideal for input signal conditioning in single-supply, -, analog-todigital converter subsystems such as the AD1877. The SSM2135 makes an ideal single-supply stereo output amplifier for audio digital-to-analog converters (DACs) because of its low noise and distortion. The SSM2135 dual audio operational amplifier permits excellent performance in portable or low power audio systems, with an operating supply range of 4 V to 36 V or 2 V to 18 V. The unity-gain stable device has very low voltage noise of 5.2 nV/Hz, and total harmonic distortion plus noise below 0.01% over normal signal levels and loads. Such characteristics are enhanced by wide output swing and load drive capability. A unique output stage permits output swing approaching the rail under moderate load conditions. Under severe loading, the SSM2135 still maintains a wide output swing with ultralow distortion. Particularly well suited for computer audio systems The SSM2135 is available in an 8-lead plastic SOIC package and is guaranteed for operation over the extended industrial temperature range of -40C to +85C. FUNCTIONAL BLOCK DIAGRAM V+ OUTx +INx 9V 9V V-/GND 00349-001 -INx Figure 2. Rev. G 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 (c)2003-2011 Analog Devices, Inc. All rights reserved. SSM2135 TABLE OF CONTENTS Features .............................................................................................. 1 Thermal Resistance .......................................................................4 Applications....................................................................................... 1 ESD Caution...................................................................................4 Pin Connections ............................................................................... 1 Typical Performance Characteristics ..............................................5 General Description ......................................................................... 1 Applications Information .............................................................. 10 Functional Block Diagram .............................................................. 1 Application Circuits ................................................................... 10 Revision History ............................................................................... 2 Outline Dimensions ....................................................................... 14 Specifications..................................................................................... 3 Ordering Guide .......................................................................... 14 Absolute Maximum Ratings............................................................ 4 REVISION HISTORY 4/11--Rev. F to Rev. G Changes to Figure 36...................................................................... 12 2/09--Rev. E to Rev. F Updated Format..................................................................Universal Changes to Features Section, General Description Section, and Figure 1 Caption ............................................................................... 1 Changes to Specifications Section Conditions ............................. 3 Changed AVO Symbol to AV ............................................................. 3 Changes to Supply Current Parameter, Table 1 ............................ 3 Deleted ESD Ratings Table.............................................................. 3 Changes to Figure 4 and Figure 5................................................... 5 Changes to Figure 9.......................................................................... 6 Changes to Figure 15, Figure 13, and Figure 18 ........................... 7 Changes to Figure 21, Figure 24 Caption, and Figure 25 ............ 8 Changes to Figure 27 and Figure 28............................................... 9 Deleted Figure 5; Renumbered Sequentially............................... 10 Deleted 18-Bit Stereo CD-DAC Output Amplifier Section ...... 10 Changes to Applications Information Section, Low Noise Stereo Headphone Driver Amplifier Section, Figure 31, and Figure 32 ........................................................................................................... 10 Changes to Low Noise Microphone Preamplifier Section, Figure 33, and Figure 34 ................................................................ 11 Changes to Figure 37...................................................................... 12 Deleted Spice Macromodel Section ............................................. 12 Changes to Digital Volume Control Circuit Section, Figure 38, and Figure 39................................................................................... 13 Updated Outline Dimensions....................................................... 14 Changes to Ordering Guide .......................................................... 14 2/03--Rev. D to Rev. E Removed 8-Lead Plastic DIP Package .............................Universal Edits to Thermal Characteristics.....................................................4 Edits to Outline Dimensions......................................................... 14 Updated Ordering Guide .............................................................. 14 Rev. G | Page 2 of 16 SSM2135 SPECIFICATIONS VS = 5 V, -40C TA +85C, unless otherwise noted. Typical specifications apply at TA = 25C. Table 1. Parameter AUDIO PERFORMANCE Voltage Noise Density Current Noise Density Signal-To-Noise Ratio Headroom Total Harmonic Distortion Plus Noise DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Settling Time INPUT CHARACTERISTICS Input Voltage Range Input Offset Voltage Input Bias Current Input Offset Current Differential Input Impedance Common-Mode Rejection Large Signal Voltage Gain OUTPUT CHARACTERISTICS Output Voltage Swing High Output Voltage Swing Low Short-Circuit Current Limit POWER SUPPLY Supply Voltage Range Power Supply Rejection Ratio Supply Current Symbol Conditions en in SNR HR THD + N f = 1 kHz f = 1 kHz 20 Hz to 20 kHz, 0 dBu = 0.775 V rms Clip point = 1% THD + N, f = 1 kHz, RL = 10 k AV = +1, VOUT = 1 V p-p, f = 1 kHz, 80 kHz LPF RL = 10 k RL = 32 SR GBW tS VCM VOS IB IOS ZIN CMR AV VOH VOL RL = 2 k, TA = 25C Min 0.6 To 0.1%, 2 V Step 87 2 RL = 100 k RL = 600 RL = 100 k RL = 600 4.1 3.9 PSRR ISY 0.003 0.005 % % 0.9 3.5 5.8 V/s MHz s 4.0 2.0 750 50 4 112 3.5 3.0 30 Single supply Dual supply VS = 4 V to 6 V, f = dc VS = 5 V, VOUT = 2.0 V, no load VS = 18 V, VOUT = 0 V, no load Rev. G | Page 3 of 16 4 2 90 Unit nV/Hz pA/Hz dBu dBu 0.2 300 0 V VCM 4 V, f = dc 0.01 V VOUT 3.9 V, RL = 600 Max 5.2 0.5 121 5.3 0 VOUT = 2 V VCM = 0 V, VOUT = 2 V VCM = 0 V, VOUT = 2 V ISC VS Typ 36 18 120 2.8 3.7 6.0 7.6 V mV nA nA M dB V/V V V mV mV mA V V dB mA mA SSM2135 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Single Supply Dual Supply Input Voltage Differential Input Voltage Output Short-Circuit Duration Storage Temperature Range Operating Temperature Range Junction Temperature Range (TJ) Lead Temperature (Soldering, 60 sec) THERMAL RESISTANCE Rating JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. 36 V 18 V VS 10 V Indefinite -65C to +150C -40C to +85C -65C to +150C 300C Table 3. Package Type 8-Lead SOIC (R-8) ESD CAUTION 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. Rev. G | Page 4 of 16 JA 158 JC 43 Unit C/W SSM2135 TYPICAL PERFORMANCE CHARACTERISTICS 10 VS = 5V AV = +1 f = 1kHz VIN = 1V p-p RL = 10k 80kHz LOW-PASS FILTER THD + N (%) 1 5V 0.1 500F 0.01 00349-003 0.001 10 2.5V DC 1 VS = 5V f = 1kHz VOUT = 2.5V p-p RL = 100k 80kHz LOW-PASS FILTER RL = 32 NONINVERTING 0.1 THD + N (%) THD + N (%) 10k Figure 6. THD + N vs. Load (See Figure 3) AV = +1 VS = 5V f = 1kHz 80kHz LOW-PASS FILTER 0.1 1k LOAD RESISTANCE () Figure 3. Test Circuit for Figure 4, Figure 5, and Figure 6 1 100 00349-006 RL RL = 10k 0.01 INVERTING 0.01 0.1 1 5 INPUT VOLTAGE (V p-p) 0.001 00349-004 0.0005 50m 0 10 40 50 60 Figure 7. THD + N vs. Gain 1 AV = +1 VS = 5V VIN = 1V p-p 80kHz LOW-PASS FILTER 0.1 VS = 5V AV = +1 f = 1kHz VIN = 1V p-p RL = 10k 80kHz LOW-PASS FILTER 0.1 THD + N (%) THD + N (%) 30 GAIN (dB) Figure 4. THD + N vs. Amplitude (See Figure 3) 1 20 00349-007 0.001 RL = 32 0.01 0.01 RL = 10k 1k 10k FREQUENCY (Hz) 20k 0.001 0 5 10 15 20 SUPPLY VOLTAGE (V) Figure 8. THD + N vs. Supply Voltage Figure 5. THD + N vs. Frequency (See Figure 3) Rev. G | Page 5 of 16 25 30 00349-008 100 00349-005 0.001 0.0005 20 SSM2135 10 5 VS = 5V AV = +1 f = 1kHz RL = 10k VS = 5V TA = 25C 4 3 in (pA/ Hz) SMPTE (%) 1 0.1 2 0.01 0.1 1 5 AMPLITUDE (V p-p) 0 00349-009 0.001 50m 1 10 100 1k FREQUENCY (Hz) Figure 9. SMPTE Intermodulation Distortion 00349-012 1 Figure 12. Current Noise Density vs. Frequency 2.0 AV = +1 VS = 5V VIN = 1V p-p RL = 10k 1.5 1s 1.0 AMPLITUDE (dBu) 100 90 0.5 0 -0.5 -1.0 10 00349-010 -2.0 10 100 Figure 10. Input Voltage Noise (20 nV/Div) 30 1k 10k 100k FREQUENCY (Hz) Figure 13. Frequency Response VS = 5V TA = 25C 25 5s 5s 20mV 20mV 100 90 15 10 5 10 0 1 10 100 FREQUENCY (Hz) 1k Figure 11. Voltage Noise Density vs. Frequency Figure 14. Square Wave Response (VS = 5 V, AV = +1, RL = ) Rev. G | Page 6 of 16 00349-014 0% 00349-011 en (nV/ Hz) 20 00349-013 -1.5 0% SSM2135 60 50 VS = 5V 40 TA = 25C RL = 10k VS = 5V TA = 25C AV = +100 40 CLOSED-LOOP GAIN (dB) CROSSTALK (dB) 20 0 -20 -40 -60 -80 30 AV = +10 20 10 AV = +1 0 -100 10k 100k 1M 10M FREQUENCY (Hz) -20 1k 1M 10M Figure 18. Closed-Loop Gain vs. Frequency 100 VS = 5V TA = 25C 120 VS = 5V TA = 25C 80 OPEN-LOOP GAIN (dB) 100 80 60 40 0 100 1k 10k 100k 1M FREQUENCY (Hz) 0 60 45 GAIN 40 90 PHASE 20 135 0 180 20 00349-016 COMMON-MODE REJECTION (dB) 100k FREQUENCY (Hz) Figure 15. Crosstalk vs. Frequency 140 10k -20 1k 10k 100k PHASE (Degrees) 1k 225 10M 1M 00349-019 100 00349-015 -140 10 00349-018 -10 -105 -120 FREQUENCY (Hz) Figure 16. Common-Mode Rejection vs. Frequency Figure 19. Open-Loop Gain and Phase vs. Frequency 140 50 VS = 5V AV = +1 120 TA = 25C VS = 5V RL= 2k VIN = 100mV p-p TA = 25C AV = +1 45 40 100 OVERSHOOT (%) +PSRR 60 -PSRR 40 30 NEGATIVE EDGE 25 20 POSITIVE EDGE 15 20 10 0 100 1k 10k 100k FREQUENCY (Hz) 1M Figure 17. Power Supply Rejection Ratio vs. Frequency 0 0 100 200 300 400 LOAD CAPACITANCE (pF) Figure 20. Small Signal Overshoot vs. Load Capacitance Rev. G | Page 7 of 16 500 00349-020 5 -20 10 00349-017 PSRR (dB) 35 80 SSM2135 50 40 VS = 5V TA = 25C 45 VS = 5V AV = +1 RL = 10k f = 1kHz THD + N = 1% TA = 25C 35 40 AV = +100 30 25 20 AV = +10 15 30 OUTPUT VOLTAGE (V) IMPEDANCE () 35 25 20 15 10 10 5 5 AV = +1 100k 1M FREQUENCY (Hz) 0 0 POSITIVE OUTPUT SWING (V) 25 30 35 40 3 2 2.0 VS = 5V 1.5 4.5 +SWING RL = 2k 4.0 1.0 +SWING RL = 600 -SWING RL = 2k 0.5 3.5 -SWING RL = 600 1 10 100 1k 10k 100k LOAD RESISTANCE () 3.0 -75 00349-022 0 -50 5 0 25 50 75 100 0 125 TEMPERATURE (C) Figure 25. Output Swing vs. Temperature and Load Figure 22. Maximum Output Voltage vs. Load Resistance 6 -25 2.0 VS = 5V RL = 2k TA = 25C AV = +1 VS = 5V 0.5V VOUT 4V 1.5 SLEW RATE (V/s) 4 3 2 +SLEW RATE 1.0 -SLEW RATE 0.5 0 1k 10k 100k 1M FREQUENCY (Hz) 10M 00349-023 1 Figure 23. Maximum Output Swing vs. Frequency 0 -75 -50 -25 0 25 50 75 TEMPERATURE (C) Figure 26. Slew Rate vs. Temperature Rev. G | Page 8 of 16 100 125 00349-026 MAXIMUM OUTPUT (V) 20 5.0 1 MAXIMUM OUTPUT SWING (V) 15 Figure 24. Output Voltage vs. Supply Voltage VS = 5V TA = 25C AV = +1 f = 1kHz THD + N = 1% 4 10 SUPPLY VOLTAGE (V) Figure 21. Output Impedance vs. Frequency 5 5 00349-024 10k NEGATIVE OUTPUT SWING (mV) 1k 00349-025 100 00349-021 0 10 SSM2135 20 18 5 VS = 5V VOUT = 3.9V 4 14 SUPPLY CURRENT (mA) OPEN-LOOP GAIN (V/V) 16 RL = 2k 12 10 RL = 600 8 6 4 VS = 18V VS = 15V 3 VS = +5V 2 1 -25 0 25 50 75 100 125 TEMPERATURE (C) 0 -75 2 55 50 -75 -50 -25 0 25 50 TEMPERATURE (C) 75 100 50 75 100 125 1 125 400 INPUT BIAS CURRENT (nA) 3 m GAIN BANDWIDTH PRODUCT (MHz) GBW 60 25 500 VS = +5V 300 VS = 15V 200 100 00349-028 PHASE MARGIN (Degrees) 4 65 0 Figure 29. Supply Current vs. Temperature 5 VS = 5V -25 TEMPERATURE (C) Figure 27. Open-Loop Gain vs. Temperature 70 -50 Figure 28. Gain Bandwidth Product and Phase Margin vs. Temperature Rev. G | Page 9 of 16 0 -75 -50 -25 0 25 50 75 100 TEMPERATURE (C) Figure 30. Input Bias Current vs. Temperature 125 00349-030 -50 00349-027 0 -75 00349-029 2 SSM2135 APPLICATIONS INFORMATION VCC GNDA VREF Hot plugging the input to a signal generally does not present a problem for the SSM2135, assuming that the signal does not have any voltage exceeding the supply voltage of the device. If so, it is advisable to add a series input resistor to limit the current, as well as a Zener diode to clamp the input to a voltage no higher than the supply. 34/37 8.66k 2 5V 0.1F 3 32 1 1/2 SSM2135 V+ 10F 10F 5 8 6 4 R_OUT 0.1F 1/2 SSM2135 LEFT CHANNEL RIGHT CHANNEL AGND 470F 41 10k 8.66k Figure 31. A Stereo Headphone Driver for Multimedia Sound Codec Figure 32 shows the total harmonic distortion characteristics vs. frequency driving into a 32 load, which is a very typical impedance for a high quality stereo headphone. The SSM2135 has excellent power supply rejection, and, as a result, is tolerant of poorly regulated supplies. However, for best sonic quality, the power supply should be well regulated and heavily bypassed to minimize supply modulation under heavy loads. A minimum of 10 F bypass is recommended. 1 VS = 5V 80kHz LOW-PASS FILTER 0.1 0.01 0.001 0.005 10 100 1k FREQUENCY (Hz) APPLICATION CIRCUITS 470F 7 AD1845 THD + N (%) The SSM2135 is fully protected from phase reversal for inputs going to the negative supply rail. However, internal ESD protection diodes turn on when either input is forced more than 0.5 V below the negative rail. Under this condition, input current in excess of 2 mA may cause erratic output behavior, in which case, a current limiting resistor should be included in the offending input if phase integrity is required with excessive input voltages. A 500 or higher series input resistor prevents phase inversion even with the input pulled 1 V below the negative supply. 35/36 0.1F The SSM2135 is unity-gain stable, even when driving into a fair amount of capacitive load. Driving up to 500 pF does not cause any instability in the amplifier. However, overshoot in the frequency response increases slightly. The SSM2135 makes an excellent output amplifier for 5 V only audio systems such as a multimedia workstation, a CD output amplifier, or an audio mixing system. The amplifier has large output swing even at this supply voltage because it is designed to swing to the negative rail. In addition, it easily drives load impedances as low as 25 with low distortion. 10k 40 00349-031 L_OUT 10k 20k 00349-032 The SSM2135 is a low voltage audio amplifier that has exceptionally low noise and excellent sonic quality even when driving loads as small as 25 . Designed for single supply use, the inputs and output can both swing very close to 0 V. Thus with a supply voltage at 5 V, both the input and output swing from 0 V to 4 V. Because of this, signal dynamic range can be optimized if the amplifier is biased to a 2 V reference rather than at half the supply voltage. Figure 32. Headphone Driver THD + N vs. Frequency into a 32 Load Low Noise Stereo Headphone Driver Amplifier Figure 31 shows the SSM2135 used in a stereo headphone driver for multimedia applications with the AD1845, a 16-bit stereo codec. The SSM2135 is equally well suited for the serial-bused AD1849 stereo codec. The impedance of the headphone can be as low as 25 , which covers most commercially available high fidelity headphones. Although the amplifier can operate at up to 18 V supply, it is just as efficient powered by a single 5 V. At this voltage, the amplifier has sufficient output drive to deliver distortion-free sound to a low impedance headphone. Rev. G | Page 10 of 16 SSM2135 1 THD + N (%) The 5.2 nV/Hz input noise in conjunction with low distortion make the SSM2315 an ideal device for amplifying low level signals such as those produced by microphones. Figure 34 illustrates a stereo microphone input circuit feeding a multimedia sound codec. The gain is set at 100 (40 dB), although it can be set to other gains depending on the microphone output levels. Figure 33 shows the harmonic distortion performance of the preamplifier with 1 V rms output, while operating from a single 5 V supply. The SSM2135 is biased to 2.25 V by the VREF pin of the AD1845 codec. The same voltage is buffered by the 2N4124 transistor to provide phantom power to the microphone. A typical electrets condenser microphone with an impedance range of 100 to 1 k works well with the circuit. This power booster circuit can be omitted for dynamic microphone elements. VS = 5V AV = 40dB VOUT = 1V rms 80kHz LOW-PASS FILTER 0.1 0.01 10 100 1k FREQUENCY (Hz) Figure 33. MIC Preamp THD + N Performance 10k 5V 10F 100 10F 2k 2 8 3 1 1/2 SSM2135 4 10k 5V 0.1F 2N4124 2k 35/36 34/37 32 10F RIGHT CHANNEL MIC IN 29 5V 10k 10F 0.1F L_MIC VCC GNDA VREF AD1845 5 6 100 7 1/2 SSM2135 28 R_MIC 10k Figure 34. Low Noise Microphone Preamp for Multimedia Sound Codec Rev. G | Page 11 of 16 00349-033 LEFT CHANNEL MIC IN 10k 20k 00349-034 Low Noise Microphone Preamplifier SSM2135 Single Supply Differential Line Driver Pseudoreference Voltage Generator Signal distribution and routing is often required in audio systems, particularly portable digital audio equipment for professional applications. Figure 35 shows a single-supply line driver circuit that has differential output. The bottom amplifier provides a 2 V dc bias for the differential amplifier to maximize the output swing range. The amplifier can output a maximum of 0.8 V rms signal with a 5 V supply. It is capable of driving into 600 line termination at a reduced output amplitude. For single-supply circuits, a reference voltage source is often required for biasing purposes or signal offsetting purposes. The circuit in Figure 37 provides a supply splitter function with low output impedance. The 1 F output capacitor serves as a charge reservoir to handle a sudden surge in demand by the load as well as providing a low ac impedance to it. The 0.1 F feedback capacitor compensates the amplifier in the presence of a heavy capacitive load, maintaining stability. 1k The output can source or sink up to 12 mA of current with a 5 V supply, limited only by the 100 output resistor. Reducing the resistance increases the output current capability. Alternatively, increasing the supply voltage to 12 V also improves the output drive to more than 25 mA. 5V 10F + 0.1F 1/2 SSM2135 AUDIO IN DIFFERENTIAL AUDIO OUT V+ = 5V TO 12V 1k R3 2.5k 1k 10k 1/2 SSM2135 2V C1 0.1F R1 5k 2.5k 5V 0.1F 1/2 SSM2135 5V 1/2 SSM2135 R2 5k 7.5k 1F 00349-036 100 5k Single-Supply Differential Line Receiver Receiving a differential signal with minimum distortion is achieved using the circuit in Figure 36. Unlike a difference amplifier (a subtractor), the circuit has a true balanced input impedance regardless of input drive levels; that is, each input always presents a 20 k impedance to the source. For best common-mode rejection performance, all resistors around the differential amplifier must be very well matched. Best results can be achieved using a 10 k precision resistor network. 20k 5V 10F + 0.1F 20k 20k 20k 10 1/2 SSM2135 2V 10F AUDIO OUT 5V 1F 7.5k 100 1/2 SSM2135 5V 5k 0.1F 2.5k 00349-037 20k DIFFERENTIAL AUDIO IN V+ OUTPUT 2 C2 1F Figure 37. Pseudoreference Generator Figure 35. Single-Supply Differential Line Driver 1/2 SSM2135 R4 100k Figure 36. Single-Supply Balanced Differential Line Receiver Rev. G | Page 12 of 16 00349-038 100F SSM2135 Digital Volume Control Circuit Logarithmic Volume Control Circuit Working in conjunction with the AD7528 dual 8-bit DAC, the SSM2135 makes an efficient audio attenuator, as shown in Figure 38. The circuit works off a single 5 V supply. The DACs are biased to a 2 V reference level, which is sufficient to keep the internal R-2R ladder switches of the DACs operating properly. This voltage is also the optimal midpoint of the SSM2135 common-mode and output swing range. With the circuit as shown in Figure 38, the maximum input and output swing is 1.25 V rms. Total harmonic distortion measures a respectable 0.01% at 1 kHz and 0.1% at 20 kHz. The frequency response at any attenuation level is flat to 20 kHz. Figure 39 shows a logarithmic version of the volume control function. Similar biasing is used. With an 8-bit bus, the AD7111 provides an 88.5 dB attenuation range. Each bit resolves a 0.375 dB attenuation. Refer to the AD7111 data sheet for attenuation levels for each input code. 0.1F 5V 10F + 0.1F 47F LEFT AUDIO IN 10 Each DAC can be controlled independently via the 8-bit parallel data bus. The attenuation level is linearly controlled by the binary weighting of the digital data input. Total attenuation ranges from 0 dB to 48 dB. 3 AD7528 LEFT AUDIO IN VREF A 3 14 DGND VIN VDD AD7111 47F RIGHT AUDIO IN 10 3 DGND VIN D1 16 RFB 1 IOUT AGND D1 0.1F DATA IN AND CONTROL 5V 10F + 0.1F RFBA OUT A 5V 47F 2 LEFT AUDIO OUT 5V 14 VDD AD7111 16 RFB 1 IOUT AGND 1/2 SSM2135 2 47F RIGHT AUDIO OUT 2k 10 5V 5V 0.1F 2 1/2 SSM2135 DAC A 1/2 SSM2135 47F 100 LEFT AUDIO OUT 2V 1/2 SSM2135 7.5k 2V 5k DATA IN 15 16 RIGHT AUDIO IN 18 Figure 39. Single-Supply Logarithmic Volume Control DAC A/ DAC B 19 CS WR VREFB RFBB OUT B DACB 20 1 1/2 SSM2135 47F RIGHT AUDIO OUT 2k VDD DGND 17 0.1F 5V 5 5V 0.1F 100 2V 1/2 SSM2135 5V 7.5k 2V 1F 5k 00349-040 6 CONTROL SIGNAL Figure 38. Digital Volume Control Rev. G | Page 13 of 16 00349-041 1F SSM2135 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 8 1 5 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 6.20 (0.2441) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-012-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 012407-A 4.00 (0.1574) 3.80 (0.1497) Figure 40. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) ORDERING GUIDE Model 1 SSM2135S SSM2135S-REEL SSM2135S-REEL7 SSM2135SZ SSM2135SZ-REEL SSM2135SZ-REEL7 1 Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Package Description 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N Z = RoHS Compliant Part. Rev. G | Page 14 of 16 Package Option R-8 R-8 R-8 R-8 R-8 R-8 SSM2135 NOTES Rev. G | Page 15 of 16 SSM2135 NOTES (c)2003-2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00349-0-4/11(G) Rev. G | Page 16 of 16