FUNCTIONAL BLOCK DIAGRAM
SSM2141
IN
+IN
SENSE
+V
CC
OUTPUT
V
EE
REFERENCE
25k
25k
25k
25k
1
3
2
5
7
6
4
PIN CONNECTIONS
8-Pin Plastic Mini-DIP
(P Suffix)
Narrow Body SO
(S Suffix)
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
NC = NO CONNECT
SSM2141
REFERENCE
SENSE
OUTPUT
V+
NC
IN
+IN
V
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.
a
High Common-Mode Rejection
Differential Line Receiver
SSM2141
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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
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/ s typ
Wide Bandwidth: 3 MHz typ
Low Cost
Complements SSM2142 Differential Line Driver
APPLICATIONS
Line Receivers
Summing Amplifiers
Buffer AmplifiersDrives 600 Load
SSM2141SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
SSM2141
Parameter
Symbol
Conditions
Min
Typ
Max
Units
OFFSET VOLTAGE
V
OS
V
CM
= 0 V
1000
25
1000
V
GAIN ERROR
No Load, V
IN
=
10 V, R
S
= 0
0.001 0.01
%
INPUT VOLTAGE RANGE
IVR
(Note 1)
10
V
COMMON-MODE REJECTION
CMR
V
CM
=
10 V
80
100
dB
POWER SUPPLY REJECTION RATIO
PSRR
V
S
=
6 V to
18 V
0.7
15
V/V
OUTPUT SWING
V
O
R
L
= 2 k
13
14.7
V
SHORT-CIRCUIT CURRENT LIMIT
I
SC
Output Shorted to Ground
+45/15
mA
SMALL-SIGNAL BANDWIDTH (3 dB)
BW
R
L
= 2 k
3
MHz
SLEW RATE
SR
R
L
= 2 k
6
9.5
V/
s
TOTAL HARMONIC DISTORTION
R
L
= 100 k
0.001
%
THD
R
L
= 600
0.01
CAPACITIVE LOAD DRIVE CAPABILITY C
L
No Oscillation
300
pF
SUPPLY CURRENT
I
SY
No Load
2.5
3.5
mA
NOTES
1
Input Voltage Range Guaranteed by CMR test.
Specifications subject to change without notice
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Conditions
Min
Typ
Max
Units
OFFSET VOLTAGE
V
OS
V
CM
= 0 V
2500
200
2500
V
GAIN ERROR
No Load, V
IN
=
10 V, R
S
= 0
0.002 0.02
%
INPUT VOLTAGE RANGE
IVR
(Note 1)
10
V
COMMON-MODE REJECTION
CMR
V
CM
=
10 V
75
90
dB
POWER SUPPLY REJECTION RATIO
PSRR
V
S
=
6 V to
18 V
1.0
20
V/V
OUTPUT SWING
V
O
R
L
= 2 k
13
14.7
V
SLEW RATE
SR
R
L
= 2 k
9.5
V/
s
SUPPLY CURRENT
I
SY
No Load
2.6
4.0
mA
NOTES
1
Input Voltage Range Guaranteed by CMR test.
Specifications subject to change without notice
REV. B
2
(@ V
S
= 18 V, T
A
= +25 C, unless otherwise noted)
(@ V
S
= 18 V, 40 C
T
A
+85 C)
SSM2141
REV. B
3
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 V
Input Voltage
1
. . . . . . . . . . . . . . . . . . . . . . . . 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 Characteristics
Small Signal Transient Response
Common-Mode Rejection vs. Frequency
Total Harmonic Distortion vs. Frequency
Large Signal Transient Response
Power Supply Rejection vs. Frequency
Dynamic Intermodulation Distortion vs. Frequency
Package Type
JA
2
JC
Units
8-Pin Plastic DIP (P)
103
43
C/W
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
Package
Package
Model
Range
Description
Option
SSM2141P
XIND (40
C
T
A
+85
C)
8-Pin Plastic DIP
N-8
SSM2141S
XIND (40
C
T
A
+85
C)
8-Pin Narrow Body SO
SO-8
SSM2141Typical Performance Characteristics
REV. B
4
Input 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
REV. B
5
Voltage Noise Density vs. Frequency
10mV
1mS
+10V
0V
10V
T
A
= +25
C
V
S
=
15V
NOTE: EXTERNAL AMPLIFIER GAIN = 1000;
THEREFORE, VERTICAL SCALE = 10V/DIV.
Voltage Noise from 0 kHz to 1 kHz
5mV
1S
+1V
0V
1V
0.1 TO 10Hz PEAK-TO-PEAK NOISE
Low Frequency Voltage Noise
10mV
2mS
+10V
0V
10V
NOTE: EXTERNAL AMPLIFIER GAIN = 1000;
THEREFORE, VERTICAL SCALE = 10V/DIV.
T
A
= +25
C
V
S
=
15V
Voltage Noise from 0 kHz to 10 kHz
Slew Rate Test Circuit
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.
SSM2141
REV. B
6
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Pin
Epoxy Mini-DIP
P-Suffix (N-8)
8
1
4
5
0.430 (10.92)
0.348 (8.84)
0.280 (7.11)
0.240 (6.10)
PIN 1
SEATING
PLANE
0.022 (0.558)
0.014 (0.356)
0.060 (1.52)
0.015 (0.38)
0.210 (5.33)
MAX
0.130
(3.30)
MIN
0.070 (1.77)
0.045 (1.15)
0.100
(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)
8
5
4
1
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)
0.0500
(1.27)
BSC
0.0098 (0.25)
0.0075 (0.19)
0.0500 (1.27)
0.0160 (0.41)
8
0
0.0196 (0.50)
0.0099 (0.25)
x 45
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
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 =
[E
1
+
E
2
]
2
by 100 dB
Figure 2. Precision Unity Gain Inverting Amplifier
Figure 3. Precision Summing Amplifier
Figure 4. Precision Summing Amplifier with Gain
PRINTED IN U.S.A.
Figure 5. Suitable Instrumentation Amplifier
Requirements can be Addressed by Using an
Input Stage Consisting of A
1
, A
2
, R
1
and R
2
C15322.55/91
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