SSM2142 Analog Devices, SSM2142 Datasheet

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SSM2142

Manufacturer Part Number
SSM2142
Description
Balance Line Driver
Manufacturer
Analog Devices
Datasheet

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a
GENERAL DESCRIPTION
The SSM2142 is an integrated differential-output buffer
amplifier that converts a single-ended input signal to a balanced
output signal pair with high output drive. By utilizing low noise
thermally matched thin film resistors and high slew rate
amplifiers, the SSM2142 helps maintain the sonic quality of
audio systems by eliminating power line hum, RF interference,
voltage drops, and other externally generated noise commonly
encountered with long audio cable runs. Excellent rejection of
common-mode noise and offset errors is achieved by laser
trimming of the onboard resistors, assuring high gain accuracy.
The carefully designed output stage of the SSM2142 is capable
of driving difficult loads, yielding low distortion performance
despite extremely long cables or loads as low as 600 , and is
stable over a wide range of operating conditions.
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
Transformer-Like Balanced Output
Drives 10 V RMS Into a 600
Stable When Driving Large Capacitive Loads and Long
Low Distortion
High Slew Rate
Low Gain Error
Outputs Short-Circuit Protected
Available In Space-Saving 8-Pin Mini-DIP Package
Low Cost
APPLICATIONS
Audio Mix Consoles
Distribution Amplifiers
Graphic and Parametric Equalizers
Dynamic Range Processors
Digital Effects Processors
Telecommunications Systems
Industrial Instrumentation
Hi-Fi Equipment
Cables
0.006% typ 20 Hz–20 kHz, 10 V RMS into 600
15 V/ s typ
(Differential or Single-Ended); 0.7% typ
Load
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Based on a cross-coupled, electronically balanced topology, the
SSM2142 mimics the performance of fully balanced
transformer-based solutions for line driving. However, the
SSM2142 maintains lower distortion and occupies much less
board space than transformers while achieving comparable
common-mode rejection performance with reduced parts count.
The SSM2142 in tandem with the SSM2141 differential
receiver establishes a complete, reliable solution for driving and
receiving audio signals over long cables. The SSM2141 features
an Input Common-Mode Rejection Ratio of 100 dB at 60 Hz.
Specifications demonstrating the performance of this typical
system are included in the data sheet.
GND
V
IN
ALL RESISTORS 30k
UNLESS OTHERWISE
INDICATED
FUNCTIONAL BLOCK DIAGRAM
Balanced Line Driver
10k
10k
SSM2142
50
50
Fax: 617/326-8703
+OUT FORCE
+OUT SENSE
– OUT FORCE
– OUT SENSE

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SSM2142 Summary of contents

Page 1

... Excellent rejection of common-mode noise and offset errors is achieved by laser trimming of the onboard resistors, assuring high gain accuracy. The carefully designed output stage of the SSM2142 is capable of driving difficult loads, yielding low distortion performance despite extremely long cables or loads as low as 600 , and is stable over a wide range of operating conditions ...

Page 2

... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ORDERING GUIDE Operating Model Temperature Range SSM2142P – +85 C SSM2142S* – +85 C *For availability of SOIC package, contact your local sales office – noted. Typical characteristics apply to operation at T Symbol ...

Page 3

... ± –PSR 6 +PSR 10k 100k Figure 4. Maximum Output Voltage Swing vs. Frequency 6.5 6.0 5.5 5.0 4.5 4.0 3.5 ±14 ±18 Figure 6. Supply Current vs. Supply Voltage –3– SSM2142 300 300 600 3 +18V 6 4 –18V 5 V OUT SBR = 20 LOG +25° ±18V S R ...

Page 4

... The following data, taken from the THD test circuit on an Audio Precision System One using the internal 80 kHz noise filter, demonstrates the typical performance of a balanced pair system based on the SSM2142/SSM2141 chip set. Both dif- ferential and single-ended modes of operation are shown, under a number of output load conditions which simulate various application situations ...

Page 5

... SSM2141 be used at the receiving end for best system performance. The SSM2141 receiver output is configured for a gain of one half following the 6 dB gain of the SSM2142, in order to maintain an overall system gain of unity. In applications encountering a large dc offset on the cable or ...

Page 6

... The signal quality obtained in these systems is directly dependent on the quality of the ground at each end of the wire. Also note that in single-ended operation the gain through the device is still 6 dB, and that the SSM2142 incurs no significant degradation in signal distortion or output drive capability, although the noise rejection inherent in balanced- pair systems is lost ...

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