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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 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 PIN CONNECTIONS 8-Lead Narrow-Body SOIC (S Suffix)
OUT A -IN A +IN A V-/GND V+
SSM-2135
OUT B -IN B +IN B
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 -40C to +85C.
FUNCTIONAL BLOCK DIAGRAM
V+
+IN 9V 9V -IN
OUT
V-/GND
*Protected by U.S. Patent No. 5,146,181.
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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 (c) 2003 Analog Devices, Inc. All rights reserved.
SSM2135-SPECIFICATIONS
Parameter AUDIO PERFORMANCE Voltage Noise Density Current Noise Density Signal-To-Noise Ratio Headroom Total Harmonic Distortion Symbol en in SNR HR THD+N
(VS = 5 V, -40 C < TA < +85 C, unless otherwise noted. Typical specifications apply at TA = +25 C.)
Min Typ 5.2 0.5 121 5.3 0.003 0.005 0.6 0.9 3.5 5.8 4.0 2.0 750 50 Max Unit nV//Hz pA//Hz dBu dBu % % V/ms MHz ms V mV nA nA MW dB V/mV V V mV mV mA V V dB mA mA
Conditions 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 RL = 2 kW, TA = 25C To 0.1%, 2 V Step
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
SR GBW tS VCM VOS IB IOS ZIN CMR AVO
0 VOUT = 2 V VCM = 0 V, VOUT = 2 V VCM = 0 V, VOUT = 2 V 0 V VCM 4 V, f = dc 0.01 V VOUT 3.9 V, RL = 600 W RL = 100 kW RL = 600 W RL = 100 kW RL = 600 W 87 2 4.1 3.9 30 4 2 90 0.2 300 4 112
OUTPUT CHARACTERISTICS Output Voltage Swing High VOH Output Voltage Swing Low Short Circuit Current Limit POWER SUPPLY Supply Voltage Range Power Supply Rejection Ratio Supply Current VOL ISC VS PSRR ISY
3.5 3.0
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
120 2.8 3.7
36 18 6.0 7.6
Specifications subject to change without notice.
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SSM2135
ABSOLUTE MAXIMUM RATINGS THERMAL CHARACTERISTICS
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 . . . . . . . . . . . . . -65C to +150C Operating Temperature Range . . . . . . . . . . . . -40C to +85C Junction Temperature Range (TJ) . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . . 300C
ESD RATINGS
Thermal Resistance* 8-Lead SOIC qJA qJC 158C/W 43C/W
*qJA is specified for worst case conditions, i.e., qJA is specified for device soldered in circuit board for SOIC package.
ORDERING GUIDE
Model SSM2135S
Temperature Range -40C to +85C
Package Description 8-Lead SOIC
Package Option 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.
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SSM2135-Typical Performance Characteristics
10 VS = 5V AV = +1, F = 1kHz VIN = 1V p-p RL = 10k WITH 80kHz FILTER
5V
1
THD - %
500 F RL
0.1
0.01
2.5Vdc
0.001 10 100 1k LOAD RESISTANCE - 10k
Test Circuit 1. Test Circuit for TPCs 1, 2, and 3
TPC 3. THD+N vs. Load (See Test Circuit)
AUDIO PRECISION 1
THD+N(%) VS. AMPL(V p-p)
1 VS = 5V RL = 100k VOUT = 2.5V p-p f = 1kHz WITH 80kHz FILTER
NONINVERTING
0.1
RL = 32
0.1
THD+N - %
0.010
RL = 10k
INVERTING
0.01
0.001 0.0005 50m 0.1 1 5
0.001 0
10
20
30 GAIN - dB
40
50
60
TPC 1. THD+N vs. Amplitude (See Test Circuit 1; AV = +1, VS = 5 V, f = 1 kHz, with 80 kHz Low-Pass Filter)
TPC 4. THD+N vs. Gain
AUDIO PRECISION 1
THD+N(%) VS. FREQ(Hz)
1
VS = 5V AV = +1, f = 1kHz VIN = 1V p-p RL = 10k WITH 80kHz FILTER
0.1
0.1
THD+N - %
RL = 32 0.010 RL = 10k
0.01
0.001 0.0005 20 100 1k 10k 20k
0.001 5 10 15 20 SUPPLY VOLTAGE - V 25 30
TPC 2. THD+N vs. Frequency (See Test Circuit 1; AV = +1, VIN = 1 V p-p, with 80 kHz Low-Pass Filter)
TPC 5. THD+N vs. Supply Voltage
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SSM2135
AUDIO PRECISION 10 SMPTE(%) VS AMPL(V p-p)
5 VS = 5V TA = 25 C 4
1
in - pA/ Hz
3
0.1
2
0.010
1
0.001 50m
0
0.1
1
5
1
10
100 FREQUENCY - Hz
1k
TPC 6. SMPTE Intermodulation Distortion (AV = +1, VS = 5 V, f = 1 kHz, RL = 10 kW)
TPC 9. Current Noise Density vs. Frequency
AUDIO PRECISION 2.0000 1.5000
1S
100 90
AMPL(dBu) VS FREQ(Hz)
1.0000 0.5000 0.0 -0.500
10 0%
-1.000 -1.500 -2.000 20
100
1k
10k
100k
TPC 7. Input Voltage Noise (20 nV/div)
TPC 10. Frequency Response (AV = +1, VS = 5 V, VIN = 1 V p-p, RL = 10 kW)
30 VS = 5V TA = 25 C 25
5s
100
5s
20
90
en - nV/ Hz
15
10
10
5
0%
20mV
20mV
0
1
10
100 FREQUENCY - Hz
1k
TPC 8. Voltage Noise Density vs. Frequency
TPC 11. Square Wave Response (VS = 5 V, AV = +1, RL = *)
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SSM2135
60 40 CHANNEL SEPARATION - dB 20
CLOSED-LOOP GAIN - dB
50
VS = 5V TA = 25 C
40 AV = +100 30
VS = 5V TA = 25 C
0 -20 -40 -60 -80
20 AV = +10 10
0 AV = +1 -10 -20 1k
-100 105 -120 10 100 1k 10k 100k FREQUENCY - Hz 1M 10M
10k
100k FREQUENCY - Hz
1M
10M
TPC 12. Crosstalk vs. Frequency (RL = 10 kW)
TPC 15. Closed-Loop Gain vs. Frequency
140 120
VS = 5V TA = 25 C
100 VS = 5V TA = 25 C 80 0
COMMON-MODE REJECTION - dB
100
OPEN-LOOP GAIN - dB
GAIN
80
40
PHASE
90
60
20
135
40
20 0 100
0
180
1k
10k FREQUENCY - Hz
100k
1M
-20 1k
10k
100k FREQUENCY - Hz
1M
225 10M
TPC 13. Common-Mode Rejection vs. Frequency
TPC 16. Open-Loop Gain and Phase vs. Frequency
140 120 100 80 60 40 20 -PSRR +PSRR OVERSHOOT - % VS = 5V AV = +1 TA = 25 C
50 45 40 35 30 25 20 15 10 POSITIVE EDGE NEGATIVE EDGE VS = 5V RL = 2k VIN = 100mV p-p TA = 25 C AV = +1
PSRR - dB
0 -20 10 100 1k 10k FREQUENCY - Hz 100k 1M
5 0 0 100 200 300 LOAD CAPACITANCE -pF 400 500
TPC 14. Power Supply Rejection vs. Frequency
TPC 17. Small Signal Overshoot vs. Load Capacitance
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PHASE - Degrees
60
45
SSM2135
50 45 40 35 IMPEDANCE - 30 25 20 15 10 5 0 10 AVCL = +1 100 1k 10k FREQUENCY - Hz 100k 1M AVCL = +10 AVCL = +100
OUTPUT VOLTAGE - V
40
VS = 5V TA = 25 C
35 30 25 20 15 10 5 0 0
VS = 5V AV = +1 RL = 10k f = 1kHz THD+N = 1% TA = 25 C
5
10
15 20 25 SUPPLY VOLTAGE - V
30
35
40
TPC 18. Output Impedance vs. Frequency
TPC 21. Output Swing vs. Supply Voltage
5 VS = 5V TA = 25 C AV = +1 f = 1kHz THD+N = 1%
5.0 VS = 5.0V
2.0
MAXIMUM OUTPUT - V
4.5 +SWING RL = 2k
1.5
3
4.0
2
+SWING RL = 600
1.0 +SWING RL = 2k
3.5 +SWING RL = 600 3.0 -75
0.5
1
0
1
10
100 1k LOAD RESISTANCE -
10k
100k
-50
-25
0 25 50 TEMPERATURE - C
75
100
0 125
TPC 19. Maximum Output Voltage vs. Load Resistance
TPC 22. Output Swing vs. Temperature and Load
6 VS = 5V RL = 2k TA = 25 C AV = +1
2.0 VS = 5V 0.5V VOUT 1.5 4.0V
MAXIMUM OUTPUT SWING - V
5
4
SLEW RATE - V/ S
+SLEW RATE
3
1.0 -SLEW RATE
2
0.5 1
0 1k
10k
100k FREQUENCY - Hz
1M
10M
0 -75
-50
-25
0 25 50 TEMPERATURE - C
75
100
125
TPC 20. Maximum Output Swing vs. Frequency
TPC 23. Slew Rate vs. Temperature
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NEGATIVE OUTPUT SWING - V
POSITIVE OUTPUT SWING - V
4
SSM2135
20 18 16
OPEN-LOOP GAIN - V/ V
5 VS = 5.0V TO = 3.9V 4 RL = 2k
14 12 10 8 6 4 2 0 -75 -50 -25
SUPPLY CURRENT - mA
VS = 3
18V
VS =
15V
RL = 600
2
VS = +5.0V
1
0 25 50 TEMPERATURE - C
75
100
125
0 -75
-50
-25
0 25 50 TEMPERATURE - C
75
100
125
TPC 24. Open-Loop Gain vs. Temperature
TPC 26. Supply Current vs. Temperature
70 VS = 5V
5
500
GAIN-BANDWIDTH PRODUCT - MHz
65 GBW 60 m
4
INPUT BIAS CURRENT - nA
400 VS = +5.0V
PHASE MARGIN - Degrees
300 VS = 15V
3
200
55
2
100
50 -75
1 -50 -25 0 25 50 TEMPERATURE - C 75 100 125
0 -75
-50
-25
0 25 50 TEMPERATURE - C
75
100
125
TPC 25. Gain Bandwidth Product and Phase Margin vs. Temperature
TPC 27. Input Bias Current vs. Temperature
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. 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.
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. "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.
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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.
40 35/36 34/37 32 0.1 F 10 F 5 AD1848 6 4 ROUT 41 10k 8.66k 8 0.1 F 7 1/2 470 F SSM2135 AGND 10k 2 3 1 1/2 SSM2135 10 F 8.66k 470 F
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. 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.
10k
LOUT VCC GND VREF
+5V 0.1 F
L CH. R CH.
+5V 10 F L CHANNEL MIC IN 100 10 F 2k 10k +5V 2 3 8 1 1/2 +5V 4 SSM2135 0.1 F 29 35/36 34/37 32 10 F R CHANNEL MIC IN 2k 10k 10 F 0.1 F AD1848 5 6 7 1/2 SSM2135 10k 28 RMIC LMIC VCC GND VREF
Figure 1. A Stereo Headphone Driver for Multimedia Sound Codec
2N4124
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 THD+(%) VS FREQ(Hz)
100
Figure 3. Low Noise Microphone Preamp for Multimedia Sound Codec
AUDIO PRECISION 1 THD+(%) VS FREQ(Hz)
0.1
0.1
0.010
0.001 0.0005 20 100 1k 10k 20k
0.010 20 100 1k 10k 20k
Figure 2. Headphone Driver THD+N vs. Frequency into a 32 W Load (VS = 5 V, with 80 kHz Low-Pass Filter)
Figure 4. MIC Preamp THD+N Performance (VS = 5 V, AV = 40 dB, VOUT = 1 V rms, with 80 kHz Low-Pass Filter)
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SSM2135
5V SUPPLY
AD1868
VL DL 18-BIT LL SERIAL REG. CK 18-BIT DAC
VBL
7.68k VREF VOL 330pF
9.76k
1/2 SSM2135
220 F
LEFT CHANNEL OUTPUT 47k
100pF 7.68k
AGND DR 18-BIT LR SERIAL REG. DGND VBR 18-BIT DAC VS 330pF VREF
7.68k VOR 7.68k 9.76k 100pF
1/2 SSM2135
220 F
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. 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.
Single Supply Differential Line Driver
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.
10k +5V 10 F+0.1 F 20k 1/2 SSM2135 DIFFERENTIAL AUDIO IN 20k 2.0V 1F 100 1/2 SSM2135 1/2 SSM2135 +5V 10 20k
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.
1k +5V 10 F+0.1 F
10 F AUDIO OUT 7.5k +5V 5k
0.1 F
100 F AUDIO IN 1k 1k 10k 1/2 SSM2135 2.0V 2.5k +5V 0.1 F 100 1/2 SSM2135 +5V 7.5k 5k 1/2 SSM2135 DIFFERENTIAL AUDIO OUT
2.5k
Figure 7. Single-Supply Balanced Differential Line Receiver
Pseudo-Reference Voltage Generator
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.
1F
Figure 6. Single-Supply Differential Line Driver
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SSM2135
VS+ = 5V AE 12V R3 2.5k C1 0.1 F R1 5k 1/2 SSM2135 R2 5k
Logarithmic Volume Control Circuit
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.
R4 100k VS+ OUTPUT 2 C2 1F 3 47 F L AUDIO IN DGND VIN 14 VDD AD7111 AGND 10 +5V 0.1 F 2 FB 1 OUTA 1/2 SSM2135 47 F +5V 0.1 F +5V 10 F+0.1 F
Figure 8. Pseudo-Reference Generator
Digital Volume Control Circuit
L AUDIO OUT
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.
3 +5V 10 F+0.1 F L AUDIO IN FB REFA OUTA DAC A 2 1/2 SSM2135 47 F L AUDIO OUT
3 47 F R AUDIO IN DGND VIN
14 VDD AD7111 AGND FB 1 OUTA 1/2 SSM2135 47 F 2 2k +5V 0.1 F 100 2.0V 1F 5k 1/2 SSM2135 7.5k 2.0V
R AUDIO OUT
DATA IN AND CONTROL
10 10
+5V
Figure 10. Single-Supply Logarithmic Volume Control
AD7528/PM7528
DATA IN 6 CONTROL SIGNAL 15 16 R AUDIO IN 18 DACA/ DACB CS WR FB REFB OUTB DACB 20 1 1/2 SSM2135 47 F 2k VDD 17 0.1 F +5V 1F 5k DGND 5 0.1 F 100 2.0V 1/2 SSM2135 7.5k 2.0V +5V R AUDIO OUT 19
+5V
Figure 9. Digital Volume Control
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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
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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)
8 5 4
4.00 (0.1574) 3.80 (0.1497)
1
6.20 (0.2440) 5.80 (0.2284)
1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY SEATING 0.10 PLANE
1.75 (0.0688) 1.35 (0.0532) 8 0.25 (0.0098) 0 0.19 (0.0075)
0.50 (0.0196) 0.25 (0.0099)
45
0.51 (0.0201) 0.33 (0.0130)
1.27 (0.0500) 0.41 (0.0160)
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
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SSM2135 Revision History
Location 2/03--Data Sheet changed from REV. D to REV. E. Page
Removed 8-Lead Plastic DIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Edits to THERMAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Updated OUTLINE DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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REV. E
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-16-
C00349-0-2/03(E)
PRINTED IN U.S.A.

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