SSM2143 Datasheet, PDF (8/8 Pages) Analog Devices – -6 dB Differential Line Receiver

SSM2143
LINE DRIVER/RECEIVER SYSTEM
The SSM2143 and SSM2142 provide a fully integrated line driver/
receiver system. The SSM2142 is a high performance balanced
line driver IC that converts an unbalanced input into a balanced
output signal. It can drive large capacitive loads on long cables
making it ideal for transmitting balanced audio signals. When com-
bined with an SSM2143 on the receiving end of the cable, the sys-
tem maintains high common-mode rejection and ultralow THD.
The SSM2142 is designed with a gain of +2 and the SSM2143
with a gain of 1/2, providing an overall system gain of unity.
The following data demonstrates the typical performance of the
two parts together, measured on an Audio Precision at the
SSM2143’s output. This configuration was tested with 500 feet
of cable between the ICs as well as no cable. The combination
of the two parts results in excellent THD+N and SNR and a noise
floor of typically –105 dB over a 20 Hz to 20 kHz bandwidth.
A comment on SSM2142/SSM2143 system headroom is neces-
sary. Figure 31 shows a maximum signal handling of approximately
±22 dBu, but it must be kept in mind that this is measured be-
tween the SSM2142’s input and SSM2143’s output, which has
been attenuated by one half. Normally, the system would be shown
as actually used in a piece of equipment, whereby the SSM2143 is
at the input and SSM2142 at the output. In this case, the system
could handle differential signals in excess of +24 dBu at the input
and output, which is consistent with headroom requirements of
most professional audio equipment.
500' CABLE
NO CABLE
Figure 30. THD+N vs. Frequency of SSM2142/SSM2143
System (V_S = ±18 V, V_IN = 5 V rms, with 80 kHz Filter)
Figure 33. SSM2142/SSM2143 System Frequency
Response (V_S = ±18 V, V_IN = 0 dBV, 500' Cable)
5V
100
90
Figure 31. SSM2142/SSM2143 System Headroom–
See Text—(V_S = ±18 V, R_L = 10 kΩ, 500' Cable)
500' CABLE
10
0%
10µs
Figure 34. SSM2142/SSM2143 System Large Signal Pulse
Response (V_S = ±18 V, R_L = 10 kΩ, No Cable)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
N-8
SO-8
NO CABLE
Figure 32. SSM2142/SSM2143 System
DIM-100 Dynamic Intermodulation
Distortion (V_S = ±18 V, R_L = 10 kΩ)
0.210
(5.33)
MAX
0.200 (5.05)
0.125 (3.18)
8
5
1
4
0.430 (10.92)
0.348 (8.84)
0.280 (7.11)
0.240 (6.10)
0.070 (1.77)
0.045 (1.15)
0.060 (1.52)
0.015 (0.38)
0.150
(3.81)
MIN
0.325 (8.25)
0.300 (7.62)
0.015 (0.381)
0.008 (0.204)
0.022 (0.558)
0.014 (0.356)
0.100
(2.54)
BSC
SEATING
PLANE
0 - 15
–8–
PIN 1
0.0098 (0.25)
0.0040 (0.10)
8
5
1
4
0.1968 (5.00)
0.1890 (4.80)
0.1574 (4.00)
0.1497 (3.80)
0°- 8°
0.2440 (6.20)
0.2284 (5.80)
0.0500 (1.27)
0.0160 (0.41)
0.0196
0.0099
(0.50)
(0.25)
×
45°
0.0688 (1.75)
0.0532 (1.35)
0.0500
(1.27)
BSC
0.0192 (0.49)
0.0098 (0.25)
0.0138 (0.35)
0.0075 (0.19)
SEATING
PLANE
SEE DETAIL
ABOVE
REV. 0