SSM2122

Manufacturer Part NumberSSM2122
DescriptionDynamic Range Processor/Dual VCA
ManufacturerAnalog Devices
SSM2122 datasheet
 


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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
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.
REV. C
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.
Dynamic Range
Processors/Dual VCA
SSM2120/SSM2122
FUNCTIONAL BLOCK DIAGRAM
V+
CURRENT
SIGNAL
MIRRORS
–V
C
+V
C
V+
V+
V–
PIN CONNECTIONS
22-Pin Plastic DIP
(P Suffix)
THRESH 1
1
22
GND
LOG AV 1
2
21
V+
SIG
CON
3
20
SIG
OUT 1
OUT 2
SIG
4
19
+V
OUT 1
C2
CFT 1
+V
5
18
CFT 2
C1
SSM2120
CFT 1
6
17
–V
TOP VIEW
C2
SIG
(Not to Scale)
–V
7
16
SIG
C1
IN 2
8
SIG
15
REC
IN 1
IN 2
REC
9
14
CON
IN 1
OUT 2
I
10
13
LOG AV 2
REF
11
V–
12
THRESH 2
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
36k
OUT
SIGNAL
INPUT
36k
V+
I
REF
16-Pin Plastic DIP
(P Suffix)
GND
1
16
GND
2
15
V+
OUT 1
3
+V
14
SIG
C1
OUT 2
SSM2122
4
13
+V
C2
TOP VIEW
–V
5
12
CFT 2
(Not to Scale)
C1
6
11
–V
IN 1
C2
I
7
10
SIG
REF
IN 2
8
V–
9
GND
© Analog Devices, Inc., 1995
Fax: 617/326-8703

SSM2122 Summary of contents