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SSM2141P-SSM2141S
High Common-Mode Rejection Differential Line Receiver
FUNCTIONAL BLOCK DIAGRAM
PIN CONNECTIONS
8-Pin Plastic Mini-DIP
(P Suffix)
Narrow Body SO
(S Suffix) REV.B
High Common-Mode Rejection
Differential Line Receiver
GENERAL DESCRIPTIONThe 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 common-
mode 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/μs 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 Ω low distortion
buffer amplifiers. For similar performance with G = 1/2, see
SSM2143.
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/ms typ
Wide Bandwidth:3 MHz typ
Low Cost
Complements SSM2142 Differential Line Driver
APPLICATIONS
Line Receivers
Summing Amplifiers
Buffer Amplifiers–Drives 600 V Load
SSM2141–SPECIFICATIONS
ELECTRICAL CHARACTERISTICSNOTESInput Voltage Range Guaranteed by CMR test.
Specifications subject to change without notice
ELECTRICAL CHARACTERISTICSNOTESInput Voltage Range Guaranteed by CMR test.
Specifications subject to change without notice
(@ VS = 618 V, TA = +258C, unless otherwise noted)
(@ VS = 618 V, –408C ≤ TA ≤ +858C)
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Input Voltage1 . . . . . . . . . . . . . . . . . . . . . . . . Supply Voltage
Output Short-Circuit Duration . . . . . . . . . . . . . . Continuous
Storage Temperature Range
P Package . . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . +300°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Operating Temperature Range . . . . . . . . . . . .–40°C to +85°C
Typical Performance CharacteristicsSmall Signal Transient Response
Common-Mode Rejection vs. Frequency
Large Signal Transient Response
Power Supply Rejection vs. Frequency
NOTES
1For supply voltages less than ±18 V, the absolute maximum input voltage is equal
to the supply voltage.
2θJA is specified for worst case mounting conditions, i.e., θJA is specified for device
in socket for P-DIP package.
ORDERING GUIDE
SSM2141–Typical Performance CharacteristicsInput Offset Voltage vs. Temperature
Gain Error vs. Temperature
Supply Current vs. Supply Voltage
Closed-Loop Output Impedance
vs. Frequency
Supply Current vs. Temperature
Maximum Output Voltage vs.
Output Current (Sink)
Closed-Loop Gain vs. Frequency
Slew Rate vs. Temperature
Maximum Output Voltage vs.
Output Current (Source)
SSM2141
OUTLINE DIMENSIONSDimensions shown in inches and (mm).
8-Pin
Epoxy Mini-DIP
P-Suffix (N-8)
PIN 1
SEATING
PLANE0.022 (0.558)
0.014 (0.356)
0.060 (1.52)
0.015 (0.38)0.210 (5.33)
MAX0.130
(3.30)
MIN
0.070 (1.77)
0.045 (1.15)
(2.54)
BSC
0.160 (4.06)
0.115 (2.93)
0.325 (8.25)
0.300 (7.62)
0.015 (0.381)
0.008 (0.204)
0.195 (4.95)
0.115 (2.93)
8-Pin Narrow Body SO
S-Suffix (SO-8)
0.1968 (5.00)
0.1890 (4.80)
0.2440 (6.20)
0.2284 (5.80)
PIN 1
0.1574 (4.00)
0.1497 (3.80)
0.0688 (1.75)
0.0532 (1.35)
SEATING
PLANE
0.0098 (0.25)
0.0040 (0.10)
0.0192 (0.49)
0.0138 (0.35)
(1.27)
BSC
0.0098 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
0.0196 (0.50)
0.0099 (0.25)x 45°
MAINTAINING COMMON-MODE REJECTIONIn 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 Ω 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.
Figure 1.Precision Difference Amplifier. Rejects
Common-Mode Signal =
[E1+E2]by 100 dB
Figure 2.Precision Unity Gain Inverting Amplifier
Figure 3.Precision Summing Amplifier
PRINTED IN U.S.A.
Figure 5.Suitable Instrumentation Amplifier
Requirements can be Addressed by Using an
Input Stage Consisting of A1, A2, R1 and R2
C1532–2.5–5/91
