SSM2120 Datasheet, PDF (1/12 Pages) Analog Devices – Dynamic Range Processors/Dual VCA

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FEATURES
0.01% THD at +10 dBV In/Out
100 dB VCA Dynamic Range
Low VCA Control Feedthrough
100 dB Level Detection Range
Log/Antilog Control Paths
Low External Component Count
APPLICATIONS
Compressors
Expanders
Limiters
AGC Circuits
Voltage-Controlled Filters
Noise Reduction Systems
Stereo Noise Gates
Dynamic Range
Processors/Dual VCA
SSM2120/SSM2122
FUNCTIONAL BLOCK DIAGRAM
V+
CURRENT
MIRRORS
SIGNAL
OUT
36kΩ
–V_C
+V_C
V+
V+
SIGNAL
INPUT 36kΩ
V+
I_REF
GENERAL DESCRIPTION
The SSM2120 is a monolithic integrated circuit designed for the
purpose of processing dynamic signals in various analog systems
including audio. This “dynamic range processor” consists of two
VCAs and two level detectors (the SSM2122 consists of two
VCAs only). These circuit blocks allow the user to logarithmically
control the gain or attenuation of the signals presented to the
level detectors depending on their magnitudes. This allows the
compression, expansion or limiting of ac signals, some of the
primary applications for the SSM2120.
V–
PIN CONNECTIONS
22-Pin Plastic DIP
(P Suffix)
16-Pin Plastic DIP
(P Suffix)
THRESH 1 1
22 GND
LOG AV 1 2
21 V+
CON_{OUT 1} 3
20 SIG_{OUT 2}
SIG_{OUT 1} 4
19 +V_C2
+V_C1 5 _SSM2120 18 CFT 2
CFT 1 6 _{TOP VIEW} 17 –V_C2
–V_C1 7 ^{(Not to Scale)} 16 SIG_{IN 2}
SIG_{IN 1} 8
15 REC_{IN 2}
REC_{IN 1} 9
14 CON_{OUT 2}
I_REF 10
13 LOG AV 2
V– 11
12 THRESH 2
GND 1
16 GND
SIG_{OUT 1} 2
15 V+
+V_C1 3
14 SIG_{OUT 2}
CFT 1 4 SSM2122 13 +V_C2
TOP VIEW
–V_C1 5 _{(Not to Scale)} 12 CFT 2
SIG_{IN 1} 6
11 –V_C2
I_REF 7
10 SIG_{IN 2}
V– 8
9 GND
REV. C
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© Analog Devices, Inc., 1995
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