Dual Single-Supply Audio Operational Amplifier SSM2135* FEATURES Excellent Sonic Characteristics High Output Drive Capability 5.2 nV/÷Hz Equivalent Input Noise @ 1 kHz 0.001% THD+N (VO = 2.5 V p-p @ 1 kHz) 3.5 MHz Gain Bandwidth Unity-Gain Stable Low Cost PIN CONNECTIONS 8-Lead Narrow-Body SOIC (S Suffix) V+ OUT A –IN A SSM-2135 OUT B +IN A –IN B V–/GND +IN B APPLICATIONS Multimedia Audio Systems Microphone Preamplifier Headphone Driver Differential Line Receiver Balanced Line Driver Audio ADC Input Buffer Audio DAC l-V Converter and Filter Pseudo-Ground Generator GENERAL DESCRIPTION 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 4.7 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 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, sigma-delta, analog-to-digital converter subsystems such as the AD1878/AD1879. The SSM2135 is available in an 8-lead plastic SOIC package and is guaranteed for operation over the extended industrial temperature range of –40∞C to +85∞C. FUNCTIONAL BLOCK DIAGRAM V+ OUT +IN 9V 9V –IN V–/GND *Protected by U.S. Patent No. 5,146,181. REV. E 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. 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 companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. SSM2135–SPECIFICATIONS (VS = 5 V, –40ⴗC < TA < +85ⴗC, unless otherwise noted. Typical specifications apply at TA = +25ⴗC.) Parameter Symbol Conditions AUDIO PERFORMANCE Voltage Noise Density Current Noise Density Signal-To-Noise Ratio Headroom Total Harmonic Distortion 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 kW AV = +1, VO = 1 V p-p, f = 1 kHz, 80 kHz LPF RL = 10 kW RL = 32 W DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Settling Time SR GBW tS INPUT CHARACTERISTICS Input Voltage Range Input Offset Voltage Input Bias Current Input Offset Current Differential Input Impedance Common-Mode Rejection Large Signal Voltage Gain VCM VOS IB IOS ZIN CMR AVO OUTPUT CHARACTERISTICS Output Voltage Swing High VOH Output Voltage Swing Low VOL Short Circuit Current Limit ISC POWER SUPPLY Supply Voltage Range Power Supply Rejection Ratio Supply Current VS PSRR ISY Min RL = 2 kW, TA = 25∞C 0.6 To 0.1%, 2 V Step Typ nV/÷Hz pA/÷Hz dBu dBu 0.003 0.005 % % 0.9 3.5 5.8 V/ms MHz ms 0.2 300 0 V £ VCM £ 4 V, f = dc 0.01 V £ VOUT £ 3.9 V, RL = 600 W 87 2 RL = 100 kW RL = 600 W RL = 100 kW RL = 600 W 4.1 3.9 Single Supply Dual Supply VS = 4 V to 6 V, f = dc VOUT = 2.0 V, No Load VS = 5 V VS = ± 18 V, VOUT = 0 V, No Load 4 ±2 90 Unit 5.2 0.5 121 5.3 0 VOUT = 2 V VCM = 0 V, VOUT = 2 V VCM = 0 V, VOUT = 2 V Max 4.0 2.0 750 50 4 112 ± 30 120 2.8 3.7 3.5 3.0 V mV nA nA MW dB V/mV V V mV mV mA 36 ± 18 V V dB 6.0 7.6 mA mA Specifications subject to change without notice. –2– REV. E SSM2135 THERMAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS Supply Voltage Single Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 V Dual Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 10 V Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite Storage Temperature Range . . . . . . . . . . . . . –65∞C to +150∞C Operating Temperature Range . . . . . . . . . . . . –40∞C to +85∞C Junction Temperature Range (TJ) . . . . . . . . . –65∞C to +150∞C Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . . 300∞C Thermal Resistance* qJA qJC 8-Lead SOIC *qJA is specified for worst case conditions, i.e., qJA is specified for device soldered in circuit board for SOIC package. ORDERING GUIDE ESD RATINGS Model Temperature Range Package Description Package Option SSM2135S –40∞C to +85∞C 8-Lead SOIC SOIC-8 883 (Human Body) Model . . . . . . . . . . . . . . . . . . . . . . . . 1 kV EIAJ Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 V 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 the SSM2135 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. REV. E 158∞C/W 43∞C/W –3– SSM2135–Typical Performance Characteristics 10 VS = 5V AV = +1, F = 1kHz VIN = 1V p-p RL = 10k⍀ WITH 80kHz FILTER 1 5V THD – % 500F RL 0.1 0.01 2.5Vdc 0.001 100 1k LOAD RESISTANCE – ⍀ 10 Test Circuit 1. Test Circuit for TPCs 1, 2, and 3 AUDIO PRECISION 1 TPC 3. THD+N vs. Load (See Test Circuit) THD+N(%) VS. AMPL(V p-p) 1 VS = 5V RL = 100k⍀ VOUT = 2.5V p-p f = 1kHz WITH 80kHz FILTER 0.1 RL = 32⍀ NONINVERTING THD+N – % 0.1 RL = 10k⍀ 0.010 10k INVERTING 0.01 0.001 0.0005 50m 0.1 1 0.001 0 5 10 TPC 1. THD+N vs. Amplitude (See Test Circuit 1; AV = +1, VS = 5 V, f = 1 kHz, with 80 kHz Low-Pass Filter) AUDIO PRECISION 1 20 30 GAIN – dB 40 50 60 TPC 4. THD+N vs. Gain THD+N(%) VS. FREQ(Hz) 1 0.1 VS = 5V AV = +1, f = 1kHz VIN = 1V p-p RL = 10k⍀ WITH 80kHz FILTER THD+N – % 0.1 RL = 32⍀ 0.010 0.01 RL = 10k⍀ 0.001 0.001 0.0005 20 100 1k 10k 5 20k 10 15 20 SUPPLY VOLTAGE – V 25 30 TPC 5. THD+N vs. Supply Voltage TPC 2. THD+N vs. Frequency (See Test Circuit 1; AV = +1, VIN = 1 V p-p, with 80 kHz Low-Pass Filter) –4– REV. E SSM2135 AUDIO PRECISION 10 SMPTE(%) VS AMPL(V p-p) 5 VS = 5V TA = 25ⴗC 4 in – pA/ Hz 1 0.1 3 2 0.010 1 0 0.001 50m 0.1 1 1 5 TPC 6. SMPTE Intermodulation Distortion (AV = +1, VS = 5 V, f = 1 kHz, RL = 10 kW) 10 100 FREQUENCY – Hz 1k TPC 9. Current Noise Density vs. Frequency AUDIO PRECISION 2.0000 AMPL(dBu) VS FREQ(Hz) 1.5000 1S 1.0000 100 90 0.5000 0.0 –0.500 10 0% –1.000 –1.500 –2.000 20 TPC 7. Input Voltage Noise (20 nV/div) 100 1k 10k 100k TPC 10. Frequency Response (AV = +1, VS = 5 V, VIN = 1 V p-p, RL = 10 kW) 30 VS = 5V TA = 25ⴗC 25 5µs 5µs 20mV 20mV 100 90 en – nV/ Hz 20 15 10 10 0% 5 0 1 10 100 FREQUENCY – Hz 1k TPC 8. Voltage Noise Density vs. Frequency REV. E TPC 11. Square Wave Response (VS = 5 V, AV = +1, RL = •) –5– SSM2135 50 60 VS = 5V TA = 25ⴗC VS = 5V TA = 25ⴗC 40 AV = +100 20 CLOSED-LOOP GAIN – dB CHANNEL SEPARATION – dB 40 0 –20 –40 –60 –80 30 20 AV = +10 10 0 AV = +1 –100 105 –10 –120 100 1k 10k 100k FREQUENCY – Hz 1M –20 1k 10M TPC 12. Crosstalk vs. Frequency (RL = 10 kW) 10M 1M 100 VS = 5V TA = 25ⴗC VS = 5V TA = 25ⴗC 120 80 100 80 60 40 20 0 100 1k 10k FREQUENCY – Hz 0 60 45 GAIN 40 90 PHASE 20 135 0 180 –20 1k 1M 100k TPC 13. Common-Mode Rejection vs. Frequency 10k 100k FREQUENCY – Hz 225 10M 1M TPC 16. Open-Loop Gain and Phase vs. Frequency 50 140 VS = 5V AV = +1 TA = 25ⴗC 120 VS = 5V RL = 2k⍀ VIN = 100mV p-p TA = 25ⴗC AV = +1 45 40 OVERSHOOT – % 100 PSRR – dB 100k FREQUENCY - Hz TPC 15. Closed-Loop Gain vs. Frequency OPEN-LOOP GAIN – dB COMMON-MODE REJECTION – dB 140 10k PHASE – Degrees 10 80 +PSRR 60 –PSRR 40 35 30 NEGATIVE EDGE 25 20 POSITIVE EDGE 15 20 10 0 5 –20 10 100 1k 10k FREQUENCY – Hz 100k 0 1M TPC 14. Power Supply Rejection vs. Frequency 0 100 200 300 LOAD CAPACITANCE –pF 400 500 TPC 17. Small Signal Overshoot vs. Load Capacitance –6– REV. E SSM2135 50 40 VS = 5V TA = 25ⴗC 45 VS = 5V AV = +1 RL = 10k⍀ f = 1kHz THD+N = 1% TA = 25ⴗC 35 IMPEDANCE – ⍀ 35 OUTPUT VOLTAGE – V 40 AVCL = +100 30 25 AVCL = +10 20 15 30 25 20 15 10 10 5 5 AVCL = +1 100 1k 10k FREQUENCY – Hz 100k 0 1M 0 TPC 18. Output Impedance vs. Frequency 35 40 2.0 VS = 5.0V POSITIVE OUTPUT SWING – V MAXIMUM OUTPUT – V 30 5.0 VS = 5V TA = 25ⴗC AV = +1 f = 1kHz THD+N = 1% 4 3 2 1 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 LOAD RESISTANCE – ⍀ 10k 3.0 –75 100k TPC 19. Maximum Output Voltage vs. Load Resistance –50 –25 0 25 50 TEMPERATURE – ⴗC 75 100 0 125 TPC 22. Output Swing vs. Temperature and Load 6 2.0 VS = 5V RL = 2k⍀ TA = 25ⴗC AV = +1 5 VS = 5V 0.5V VOUT 4.0V 1.5 SLEW RATE – V/S MAXIMUM OUTPUT SWING – V 15 20 25 SUPPLY VOLTAGE – V TPC 21. Output Swing vs. Supply Voltage 5 0 10 5 4 3 2 +SLEW RATE 1.0 –SLEW RATE 0.5 1 0 1k 10k 100k FREQUENCY – Hz 1M 0 –75 10M TPC 20. Maximum Output Swing vs. Frequency REV. E NEGATIVE OUTPUT SWING – V 0 10 –50 –25 0 25 50 TEMPERATURE – ⴗC 75 100 TPC 23. Slew Rate vs. Temperature –7– 125 SSM2135 5 20 VS = 5.0V TO = 3.9V 18 4 SUPPLY CURRENT – mA OPEN-LOOP GAIN – V/V 16 RL = 2k⍀ 14 12 10 RL = 600⍀ 8 6 VS = ⴞ18V VS = ⴞ15V 3 VS = +5.0V 2 1 4 2 0 –75 –50 –25 0 25 50 TEMPERATURE – ⴗC 75 0 –75 125 100 –25 0 25 50 TEMPERATURE – ⴗC 75 100 125 TPC 26. Supply Current vs. Temperature TPC 24. Open-Loop Gain vs. Temperature 500 5 70 –50 GBW 60 3 m 55 50 –75 2 400 INPUT BIAS CURRENT – nA 4 65 GAIN-BANDWIDTH PRODUCT – MHz PHASE MARGIN – Degrees VS = 5V –25 0 25 50 TEMPERATURE – ⴗC 75 100 VS = ⴞ15V 200 100 1 –50 VS = +5.0V 300 0 –75 125 –50 –25 0 25 50 TEMPERATURE – ⴗC 75 100 125 TPC 27. Input Bias Current vs. Temperature TPC 25. Gain Bandwidth Product and Phase Margin vs. Temperature The SSM2135 is fully protected from phase reversal for inputs going to the negative supply rail. However, internal ESD protection diodes will 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 W or higher series input resistor will prevent phase inversion even with the input pulled 1 V below the negative supply. APPLICATION INFORMATION 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 W. Designed for single supply use, the SSM2135’s inputs common-mode and output swing to 0 V. Thus with a supply voltage at 5 V, both the input and output will 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. 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. “Hot” plugging the input to a signal generally does not present a problem for the SSM2135, assuming the signal does not have any voltage exceeding the device’s supply voltage. 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. 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 W with low distortion. –8– REV. E SSM2135 APPLICATION CIRCUITS Low Noise Microphone Preamplifier Low Noise Stereo Headphone Driver Amplifier Figure 1 shows the SSM2135 used in a stereo headphone driver for multimedia applications with the AD1848, a 16-bit stereo codec. The SSM2135 is equally well suited for the serial-bused AD1849 stereo codec. The headphone’s impedance can be as low as 25 W, 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. The SSM2135’s 4.7 nV/÷Hz input noise in conjunction with low distortion makes it an ideal device for amplifying low level signals such as those produced by microphones. Figure 3 illustrates a stereo microphone input circuit feeding a multimedia sound codec. As shown, the gain is set at 100 (40 dB), although it can be set to other gains depending on the microphone output levels. Figure 4 shows the preamplifier’s harmonic distortion performance with 1 V rms output while operating from a single 5 V supply. LOUT VCC GND VREF 10k⍀ 40 35/36 8.66k⍀ 2 +5V 0.1F 1 1/2 SSM2135 10F 3 34/37 470F L CH. 32 0.1F 10k⍀ 10F R CH. 5 AD1848 8 0.1F 6 4 ROUT The SSM2135 is biased to 2.25 V by the VREF pin of the AD1848 codec. The same voltage is buffered by the 2N4124 transistor to provide “phantom power” to the microphone. A typical electret condenser microphone with an impedance range of 100 W to 1 kW works well with the circuit. This power booster circuit may be omitted for dynamic microphone elements. 7 1/2 470F SSM2135 +5V 10F AGND 41 10F 2k⍀ 10k⍀ 8.66k⍀ 2 3 10k⍀ +5V 8 1 1/2 +5V 4 SSM2135 0.1F 2N4124 Figure 1. A Stereo Headphone Driver for Multimedia Sound Codec R CHANNEL MIC IN 29 35/36 34/37 32 10F Figure 2 shows the total harmonic distortion characteristics versus frequency driving into a 32 W 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 mF bypass is recommended. AUDIO PRECISION 1 100⍀ L CHANNEL MIC IN 10k⍀ 2k⍀ 10F LMIC VCC GND VREF 0.1F AD1848 5 6 100⍀ 7 1/2 SSM2135 28 RMIC 10k⍀ Figure 3. Low Noise Microphone Preamp for Multimedia Sound Codec AUDIO PRECISION 1 THD+(%) VS FREQ(Hz) THD+(%) VS FREQ(Hz) 0.1 0.1 0.010 0.001 0.010 20 0.0005 20 100 1k 10k 20k 1k 10k 20k Figure 4. MIC Preamp THD+N Performance (VS = 5 V, AV = 40 dB, VOUT = 1 V rms, with 80 kHz Low-Pass Filter) Figure 2. Headphone Driver THD+N vs. Frequency into a 32 W Load (VS = 5 V, with 80 kHz Low-Pass Filter) REV. E 100 –9– SSM2135 5V SUPPLY AD1868 18-BIT DAC VL VBL DL 18-BIT LL SERIAL REG. 9.76k⍀ 7.68k⍀ VREF 1/2 SSM2135 VOL 330pF 7.68k⍀ AGND 18-BIT LR SERIAL REG. DGND LEFT CHANNEL OUTPUT 47k⍀ 100pF CK DR 220F VREF 7.68k⍀ VOR 18-BIT DAC VS 100pF 9.76k⍀ 7.68k⍀ VBR 1/2 SSM2135 330pF 220F RIGHT CHANNEL OUTPUT 47k⍀ Figure 5. 5 V Stereo 18-Bit DAC 18-Bit Stereo CD-DAC Output Amplifier Single-Supply Differential Line Receiver The SSM2135 makes an ideal single-supply stereo output amplifier for audio D/A converters because of its low noise and distortion. Figure 5 shows the implementation of an 18-bit stereo DAC channel. The output amplifier also provides low-pass filtering for smoothing the oversampled audio signal. The filter’s cutoff frequency is set at 22.5 kHz and has a maximally flat response from dc to 20 kHz. Receiving a differential signal with minimum distortion is achieved using the circuit in Figure 7. 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 kW 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 kW precision resistor network. As mentioned above, the amplifier’s outputs can drive directly into a stereo headphone that has impedance as low as 25 W with no additional buffering required. 10k⍀ +5V 10F+0.1F Single Supply Differential Line Driver Signal distribution and routing is often required in audio systems, particularly portable digital audio equipment for professional applications. Figure 6 shows a single supply line driver circuit that has differential output. The bottom amplifier provides a 2 V dc bias for the differential amplifier in order 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 W line termination at a reduced output amplitude. 20k⍀ 1/2 SSM2135 20k⍀ DIFFERENTIAL AUDIO IN 20k⍀ 10⍀ 1/2 SSM2135 2.0V +5V 1F 100⍀ 1k⍀ 1/2 SSM2135 10F AUDIO OUT 7.5k⍀ +5V 5k⍀ +5V 10F+0.1F 0.1F 2.5k⍀ 1/2 SSM2135 100F AUDIO IN Figure 7. Single-Supply Balanced Differential Line Receiver DIFFERENTIAL AUDIO OUT 1k⍀ Pseudo-Reference Voltage Generator 1k⍀ 10k⍀ 1/2 SSM2135 2.0V 2.5k⍀ +5V 0.1F 100⍀ 1F +5V 1/2 SSM2135 7.5k⍀ 5k⍀ Figure 6. Single-Supply Differential Line Driver For single-supply circuits, a reference voltage source is often required for biasing purposes or signal offsetting purposes. The circuit in Figure 8 provides a supply splitter function with low output impedance. The 1 mF 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 mF feedback capacitor compensates the amplifier in the presence of a heavy capacitive load, maintaining stability. The output can source or sink up to 12 mA of current with a 5 V supply, limited only by the 100 W output resistor. Reducing the resistance will increase the output current capability. Alternatively, increasing the supply voltage to 12 V also improves the output drive to more than 25 mA. –10– REV. E SSM2135 Logarithmic Volume Control Circuit VS+ = 5V Æ 12V Figure 10 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. R3 2.5k⍀ C1 0.1F R1 5k⍀ R4 100k⍀ 1/2 SSM2135 +5V 0.1F VS+ OUTPUT 2 C2 1F R2 5k⍀ +5V 10F+0.1F 3 47F L AUDIO IN Figure 8. Pseudo-Reference Generator 14 DGND VIN VDD FB 1 OUTA AD7111 AGND Digital Volume Control Circuit 10 Working in conjunction with the AD7528/PM7528 dual 8-bit D/A converter, the SSM2135 makes an efficient audio attenuator, as shown in Figure 9. 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 DACs’ internal R-2R ladder switches operating properly. This voltage is also the optimal midpoint of the SSM2135’s common-mode and output swing range. With the circuit as shown, 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. 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. 1/2 SSM2135 47F L AUDIO OUT 2 +5V 0.1F 3 47F R AUDIO IN DGND VIN 14 VDD FB 1 OUTA AD7111 AGND DATA IN AND CONTROL 10 1/2 SSM2135 47F 2 R AUDIO OUT 2k 10 +5V +5V 0.1F 100⍀ 2.0V 1/2 SSM2135 7.5k 2.0V 1F 5k Figure 10. Single-Supply Logarithmic Volume Control AD7528/PM7528 3 +5V 10F+0.1F FB REFA OUTA DAC A L AUDIO IN 2 1/2 SSM2135 47F L AUDIO OUT DATA IN 6 CONTROL SIGNAL R AUDIO IN DACA/ DACB 15 CS 16 WR 18 19 FB REFB OUTB DACB 20 1 1/2 SSM2135 47F R AUDIO OUT 2k⍀ VDD DGND 17 0.1F +5V 5 +5V 0.1F 100⍀ 2.0V 1/2 SSM2135 +5V 7.5k⍀ 2.0V 1F 5k⍀ Figure 9. Digital Volume Control REV. E –11– SSM2135 SPICE MACROMODEL *SSM2135 SPICE Macro-Model 9/92, Rev. A * JCB/ADI *Copyright 1993 by Analog Devices, Inc. * *Node Assignments * * Noninverting Input * Inverting Input * Positive Supply * Negative Supply * Output .SUBCKT SSM2135 3 2 7 4 6 * * INPUT STAGE R3 4 19 1.5E3 R4 4 20 1.5E3 C1 19 20 5.311E–12 I1 7 18 106E–6 IOS 2 3 25E–09 EOS 12 5 POLY(1) 51 4 25E–06 1 Q1 19 3 18 PNP1 Q2 20 12 18 PNP1 CIN 3 2 3E–12 D1 3 1 DY D2 2 1 DY EN 5 2 22 0 1 GN1 0 2 25 0 1E–5 GN2 0 3 28 0 1E–5 * * VOLTAGE NOISE SOURCE WITH FLICKER NOISE DN1 21 22 DEN DN2 22 23 DEN VN1 21 0 DC 2 VN2 0 23 DC 2 * * CURRENT NOISE SOURCE WITH FLICKER NOISE DN3 24 25 DIN DN4 25 26 DIN VN3 24 0 DC 2 VN4 0 26 DC 2 * * SECOND CURRENT NOISE SOURCE DN5 27 28 DIN DN6 28 29 DIN VN5 27 0 DC 2 VN6 0 29 DC 2 * * GAIN STAGE & DOMINANT POLE AT .2000E+01 HZ G2 34 36 19 20 2.65E–04 R7 34 36 39E+06 V3 35 4 DC 6 D4 36 35 DX VB2 34 4 1.6 * * SUPPLY/2 GENERATOR ISY 7 4 0.2E–3 R10 7 60 40E+3 R11 60 4 40E+3 C3 60 0 1E–9 * * CMRR STAGE & POLE AT 6 kHZ ECM 50 4 POLY(2) 3 60 2 60 0 1.6 1.6 CCM 50 51 26.5E–12 RCM1 50 51 1E6 RCM2 51 4 1 * * OUTPUT STAGE R12 37 36 1E3 R13 38 36 500 C4 37 6 20E–12 C5 38 39 20E–12 M1 39 36 4 4 MN L=9E–6 W=1000E–6 AD=15E–9 AS=15E–9 M2 45 36 4 4 MN L=9E–6 W=1000E–6 AD=15E–9 AS=15E–9 5 39 47 DX D6 47 45 DX Q3 39 40 41 QPA 8 VB 7 40 DC 0.861 R14 7 41 375 Q4 41 7 43 QNA 1 R17 7 43 15 Q5 43 39 6 QNA 20 Q6 46 45 6 QPA 20 R18 46 4 15 Q7 36 46 4 QNA 1 M3 6 36 4 4 MN L=9E–6 W=2000E–6 AD=30E–9 AS=30E–9 * * NONLINEAR MODELS USED * .MODEL DX D (IS=1E–15) .MODEL DY D (IS=1E–15 BV=7) .MODEL PNP1 PNP (BF=220) .MODEL DEN D(IS=1E–12 RS=1016 KF=3.278E–15 AF=1) .MODEL DIN D(IS=1E–12 RS=100019 KF=4.173E–15 AF=1) .MODEL QNA NPN(IS=1.19E–16 BF=253 VAF=193 VAR=15 RB=2.0E3 + IRB=7.73E–6 RBM=132.8 RE=4 RC=209 CJE=2.1E–13 VJE=0.573 + MJE =0.364 CJC=1.64E–13 VJC=0.534 MJC=0.5 CJS=1.37E–12 + VJS=0.59 MJS=0.5 TF=0.43E–9 PTF=30) .MODEL QPA PNP(IS=5.21E–17 BF=131 VAF=62 VAR=15 RB=1.52E3 + IRB=1.67E 5–RBM=368.5 RE=6.31 RC=354.4 CJE=1.1E–13 + VJE=0.745 MJE=0.33 CJC=2.37E–13 VJC=0.762 MJC=0.4 + CJS=7.11E–13 VJS=0.45 MJS=0.412 TF=1.0E–9 PTF=30) .MODEL MN NMOS(LEVEL=3 VTO=1.3 RS=0.3 RD=0.3 TOX=8.5E–8 + LD=1.48E–6WD=1E–6 NSUB=1.53E16UO=650 DELTA= 10VMAX=2E5 + XJ=1.75E–6 KAPPA=0.8 ETA=0.066 THETA=0.01TPG=1 CJ=2.9E–4 + PB=0.837 MJ=0.407 CJSW=0.5E–9 MJSW=0.33) * .ENDS SSM-2135 –12– REV. E SSM2135 OUTLINE DIMENSIONS 8-Lead Standard Small Outline Package [SOIC] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 8 5 1 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY SEATING 0.10 PLANE 6.20 (0.2440) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.33 (0.0130) 0.50 (0.0196) ⴛ 45ⴗ 0.25 (0.0099) 8ⴗ 0.25 (0.0098) 0ⴗ 1.27 (0.0500) 0.41 (0.0160) 0.19 (0.0075) COMPLIANT TO JEDEC STANDARDS MS-012AA 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 REV. E –13– SSM2135 Revision History Location Page 2/03—Data Sheet changed from REV. D to REV. E. Removed 8-Lead Plastic DIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Edits to THERMAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 –14– REV. E –15– –16– PRINTED IN U.S.A. C00349–0–2/03(E)