SSM2120_15 Datasheet, PDF (1/12 Pages) Analog Devices – DYNAMIC RANGE PROCESSOR DUAL VCA

®®
Precision Monolithics Inc.
SSM-2120/SSM-2122
DYNAMIC RANGE
PROCESSOR/DUAL VCA
FEATURES
GENERAL DESCRIPTION
• 0.01% THD at +10dBV In/Out
• 100dB VCA Dynamic Range
• Low VCA Control Feedthrough
• 100dB Level Detection Range
• Log/Antilog Control Paths
• Low External Component Count
The SSM-2120 is a monolithic integrated circuit designed for the
purpose of processing dynamic signals in various analog sys-
tems including audio. This “dynamic range processor” consists
of two VCAs and two level detectors (the SSM-2122 consists of
two VCAs only). These circuit blocks allow the user to logarith-
mically control the gain or attenuation of the signals presented
to the level detectors depending on their magnitudes. This al-
APPLICATIONS
• Compressors
• Expanders
• Limiters
• AGC Circuits
O• Voltage-Controlled Filters
• Noise Reduction Systems
• ^B Stereo Noise Gates
S _{ORDERING INFORMATION}
O _PACKAGE
L PLASTIC
16-PIN
PLASTIC
22-PIN
ETE _SSM2122P
SSM2120P
OPERATING
TEMPERATURE
RANGE
–10°C to +50°C
lows the compression, expansion or limiting of AC signals, some
of the primary applications for the SSM-2120.
PIN CONNECTIONS
THRESH 1 1
LOG AV 1 2
CON_{OUT 1} 3
SIG_{OUT 1} 4
+V_C1 5
CFT 1 6
–V_C1 7
SIG_{IN 1} 8
REC_{IN 1} 9
I_REF 10
V– 11
22 GND
21 V+
20 SIG_{OUT 2}
19 +V_C2
18 CFT 2
17 –V_C2
16 SIG_{IN 2}
15 REC_{IN 2}
14 CON_{OUT 2}
13 LOG AV 2
12 THRESH 2
GND 1
SIG_{OUT 1} 2
+V_C1 3
CFT 1 4
–V_C1 5
SIG_{IN 1} 6
I_REF 7
V– 8
16 GND
15 V+
14 SIG_{OUT 2}
13 +V_C2
12 CFT 2
11 –V_C2
10 SIG_{IN 2}
9 GND
SIMPLIFIED SCHEMATIC (VCA Section Only)
V+
SSM-2120
22-PIN PLASTIC DIP
(P-Suffix)
SSM-2122
16-PIN PLASTIC DIP
(P-Suffix)
CURRENT
MIRRORS
SIGNAL
OUT
36kΩ
–V_C
+V_C
V+
V+
SIGNAL
INPUT
36kΩ
V+
I_REF
V–
Protection Act of 1983.
The SSM-2120/SSM-2122 is mask work protected under the Semiconductor Chip
5/90, Rev. B1