SSM2141 Analog Devices, SSM2141 Datasheet

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SSM2141

Manufacturer Part Number
SSM2141
Description
High Common-Mode Rejection Differential Line Receiver
Manufacturer
Analog Devices
Datasheet

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a
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 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/ 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
buffer amplifiers. For similar performance with G = 1/2, see
SSM2143.
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.
FEATURES
High Common-Mode Rejection
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
DC: 100 dB typ
60 Hz: 100 dB typ
20 kHz: 70 dB typ
40 kHz: 62 dB typ
Load
low distortion
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
High Common-Mode Rejection
–IN
+IN
Differential Line Receiver
FUNCTIONAL BLOCK DIAGRAM
REFERENCE
2
3
SSM2141
25k
25k
8-Pin Plastic Mini-DIP
PIN CONNECTIONS
+IN
–IN
V–
Narrow Body SO
1
2
3
4
NC = NO CONNECT
(P Suffix)
(S Suffix)
(Not to Scale)
SSM2141
TOP VIEW
25k
25k
8
7
6
5
NC
V+
OUTPUT
SENSE
SSM2141
4
1
5
7
6
SENSE
+V
OUTPUT
–V
REFERENCE
EE
CC
Fax: 617/326-8703

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SSM2141 Summary of contents

Page 1

... Line Receivers Summing Amplifiers Buffer Amplifiers–Drives 600 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 common- mode rejection (CMR), whereas implementing an op amp with four off-the-shelf precision resistors will typically achieve only CMR— ...

Page 2

... Load – + Symbol Conditions Load IVR (Note 1) CMR PSRR Load SY –2– SSM2141 Min Typ Max Units –1000 25 1000 = 0 0.001 0. 100 dB 0 14.7 V +45/– MHz 6 9 0.001 % 0.01 300 pF 2.5 3.5 mA Min Typ Max Units –2500 200 2500 = 0 0.002 0.02 ...

Page 3

... Range Description XIND (– +85 C) 8-Pin Plastic DIP A XIND (– +85 C) 8-Pin Narrow Body SO A Power Supply Rejection vs. Frequency Dynamic Intermodulation Distortion vs. Frequency –3– SSM2141 103 43 is specified for device JA Package Option N-8 SO-8 Large Signal Transient Response Units C/W ...

Page 4

... SSM2141–Typical Performance Characteristics Input Offset Voltage vs. Temperature Gain Error vs. Temperature Supply Current vs. Supply Voltage Closed-Loop Gain vs. Frequency Slew Rate vs. Temperature Maximum Output Voltage vs. Output Current (Source) –4– Closed-Loop Output Impedance vs. Frequency Supply Current vs. Temperature Maximum Output Voltage vs. Output Current (Sink) ...

Page 5

... THEREFORE, VERTICAL SCALE = 10µV/DIV. Voltage Noise from 0 kHz to 1 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 ...

Page 6

... SSM2141 MAINTAINING COMMON-MODE REJECTION 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 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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