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FEATURES High Common-Mode Rejection DC: 100 dB typ 60 Hz: 100 dB typ 20 kHz: 70 dB typ 40 kHz: 62 dB typ Low Distortion: 0.001% typ Fast Slew Rate: 9.5 V/ s typ Wide Bandwidth: 3 MHz typ Low Cost Complements SSM2142 Differential Line Driver APPLICATIONS Line Receivers Summing Amplifiers Buffer Amplifiers-Drives 600
High Common-Mode Rejection Differential Line Receiver SSM2141
FUNCTIONAL BLOCK DIAGRAM
25k -IN 2 25k 5 SENSE
7 +VCC
SSM2141
6 OUTPUT
4 -VEE 25k +IN 3 25k 1 REFERENCE
Load PIN CONNECTIONS 8-Pin Plastic Mini-DIP (P Suffix) Narrow Body SO (S Suffix)
REFERENCE 1 -IN 2 +IN 3 8 NC
GENERAL DESCRIPTION
The SSM2141 is an integrated differential amplifier intended to receive balanced line inputs in audio applications requiring a high level of noise immunity and optimum common-mode rejection. The SSM2141 typically achieves 100 dB of commonmode rejection (CMR), whereas implementing an op amp with four off-the-shelf precision resistors will typically achieve only 40 dB of CMR--inadequate for high-performance audio. The SSM2141 achieves low distortion performance by maintaining a large slew rate of 9.5 V/s and high open-loop gain. Distortion is less than 0.002% over the full audio bandwidth. The SSM2141 complements the SSM2142 balanced line driver. Together, these devices comprise a fully integrated solution for equivalent transformer balancing of audio signals without the problems of distortion, EMI fields, and high cost. Additional applications for the SSM2141 include summing signals, differential preamplifiers, and 600 low distortion buffer amplifiers. For similar performance with G = 1/2, see SSM2143.
SSM2141
7 V+
6 OUTPUT TOP VIEW (Not to Scale) 5 SENSE V- 4 NC = NO CONNECT
REV. B
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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
SSM2141-SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
Parameter OFFSET VOLTAGE GAIN ERROR INPUT VOLTAGE RANGE COMMON-MODE REJECTION POWER SUPPLY REJECTION RATIO OUTPUT SWING SHORT-CIRCUIT CURRENT LIMIT SMALL-SIGNAL BANDWIDTH (-3 dB) SLEW RATE TOTAL HARMONIC DISTORTION THD CAPACITIVE LOAD DRIVE CAPABILITY CL SUPPLY CURRENT
NOTES 1 Input Voltage Range Guaranteed by CMR test. Specifications subject to change without notice
(@ VS =
Symbol VOS
18 V, TA = +25 C, unless otherwise noted)
Conditions VCM = 0 V No Load, VIN = 10 V, RS = 0 Min -1000 SSM2141 Typ Max 25 1000 Units V % V 100 0.7 13 +45/-15 3 6 9.5 0.001 0.01 300 2.5 3.5 14.7 15 dB V/V V mA MHz V/s % pF mA
0.001 0.01 10 80
IVR CMR PSRR VO ISC BW SR
(Note 1) VCM = 10 V VS = 6 V to 18 V RL = 2 k Output Shorted to Ground RL = 2 k RL = 2 k RL = 100 k RL = 600 No Oscillation No Load
ISY
ELECTRICAL CHARACTERISTICS (@ V =
S
18 V, -40 C TA +85 C)
Conditions VCM = 0 V No Load, VIN = 10 V, RS = 0 Min -2500 Typ 200 Max 2500 Units V % V 90 1.0 13 14.7 9.5 2.6 4.0 20 dB V/V V V/s mA
Parameter OFFSET VOLTAGE GAIN ERROR INPUT VOLTAGE RANGE COMMON-MODE REJECTION POWER SUPPLY REJECTION RATIO OUTPUT SWING SLEW RATE SUPPLY CURRENT
NOTES 1 Input Voltage Range Guaranteed by CMR test. Specifications subject to change without notice
Symbol VOS
0.002 0.02 10 75
IVR CMR PSRR VO SR ISY
(Note 1) VCM = 10 V VS = 6 V to 18 V RL = 2 k RL = 2 k No Load
-2-
REV. B
SSM2141
ABSOLUTE MAXIMUM RATINGS 1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V Input Voltage1 . . . . . . . . . . . . . . . . . . . . . . . . Supply Voltage Output Short-Circuit Duration . . . . . . . . . . . . . . Continuous Storage Temperature Range P Package . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . +300C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +150C Operating Temperature Range . . . . . . . . . . . . -40C to +85C
Package Type 8-Pin Plastic DIP (P)
JA
2
JC
Units C/W
103
43
NOTES 1 For supply voltages less than 18 V, the absolute maximum input voltage is equal to the supply voltage. 2 JA is specified for worst case mounting conditions, i.e., JA is specified for device in socket for P-DIP package.
ORDERING GUIDE Operating Temperature Range XIND (-40C TA +85C) XIND (-40C TA +85C) Package Description 8-Pin Plastic DIP 8-Pin Narrow Body SO Package Option N-8 SO-8
Model SSM2141P SSM2141S
Typical Performance Characteristics
Small Signal Transient Response
Large Signal Transient Response
Common-Mode Rejection vs. Frequency
Power Supply Rejection vs. Frequency
Total Harmonic Distortion vs. Frequency
Dynamic Intermodulation Distortion vs. Frequency
REV. B
-3-
SSM2141-Typical Performance Characteristics
Input Offset Voltage vs. Temperature
Closed-Loop Gain vs. Frequency
Closed-Loop Output Impedance vs. Frequency
Gain Error vs. Temperature
Slew Rate vs. Temperature
Supply Current vs. Temperature
Supply Current vs. Supply Voltage
Maximum Output Voltage vs. Output Current (Source)
Maximum Output Voltage vs. Output Current (Sink)
-4-
REV. B
SSM2141
5mV 1S
+1V 0V -1V
0.1 TO 10Hz PEAK-TO-PEAK NOISE
Voltage Noise Density vs. Frequency
Low Frequency Voltage Noise
10mV
1mS
10mV
2mS
+10V 0V -10V TA = +25C VS = 15V NOTE: EXTERNAL AMPLIFIER GAIN = 1000; THEREFORE, VERTICAL SCALE = 10V/DIV.
TA = +25C VS = 15V NOTE: EXTERNAL AMPLIFIER GAIN = 1000; THEREFORE, VERTICAL SCALE = 10V/DIV.
+10V 0V -10V
Voltage Noise from 0 kHz to 1 kHz
Voltage Noise from 0 kHz to 10 kHz
APPLICATIONS INFORMATION
The SSM2141 represents a versatile analog building block. In order to capitalize on fast settling time, high slew rate, and high CMR, proper decoupling and grounding techniques must be employed. For decoupling, place 0.1 F capacitor located within close proximity from each supply pin to ground.
Slew Rate Test Circuit
REV. B
-5-
SSM2141
MAINTAINING COMMON-MODE REJECTION
Figure 5. Suitable Instrumentation Amplifier Requirements can be Addressed by Using an Input Stage Consisting of A1, A2, R1 and R2
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Figure 1. Precision Difference Amplifier. Rejects [E1 +E 2 ] Common-Mode Signal = by 100 dB
2
8-Pin Epoxy Mini-DIP P-Suffix (N-8)
0.430 (10.92) 0.348 (8.84)
8 5
0.280 (7.11) 0.240 (6.10)
1 4
PIN 1 0.210 (5.33) MAX 0.160 (4.06) 0.115 (2.93)
0.060 (1.52) 0.015 (0.38) 0.130 (3.30) MIN SEATING PLANE
0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93)
Figure 2. Precision Unity Gain Inverting Amplifier
0.022 (0.558) 0.100 0.070 (1.77) 0.014 (0.356) (2.54) 0.045 (1.15) BSC
0.015 (0.381) 0.008 (0.204)
8-Pin Narrow Body SO S-Suffix (SO-8)
0.1968 (5.00) 0.1890 (4.80)
Figure 3. Precision Summing Amplifier
0.1574 (4.00) 0.1497 (3.80)
8 1
5 4
0.2440 (6.20) 0.2284 (5.80)
PIN 1 0.0098 (0.25) 0.0040 (0.10)
0.0688 (1.75) 0.0532 (1.35)
0.0196 (0.50) x 45 0.0099 (0.25)
SEATING PLANE
0.0500 0.0192 (0.49) (1.27) 0.0138 (0.35) BSC
0.0098 (0.25) 0.0075 (0.19)
8 0
0.0500 (1.27) 0.0160 (0.41)
Figure 4. Precision Summing Amplifier with Gain
-6-
REV. B
PRINTED IN U.S.A.
C1532-2.5-5/91
In order to achieve the full common-mode rejection capability of the SSM2141, the source impedance must be carefully controlled. Slight imbalances of the source resistance will result in a degradation of DC CMR--even a 5 imbalance will degrade CMR by 20 dB. Also, the matching of the reactive source impedance must be matched in order to preserve the CMRR over frequency.

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