a
FEATURES
Four High Performance VCAs in a Single Package
0.02% THD
No External Trimming
120 dB Gain Range
0.07 dB Gain Matching (Unity Gain)
Class A or AB Operation
APPLICATIONS
Remote, Automatic, or Computer Volume Controls
Automotive Volume/Balance/Faders
Audio Mixers
Compressor/Limiters/Compandors
Noise Reduction Systems
Automatic Gain Controls
Voltage Controlled Filters
Spatial Sound Processors
Effects Processors
GENERAL DESCRIPTION
Low Cost Quad
Voltage Controlled Amplifier
SSM2164
FUNCTIONAL BLOCK DIAGRAM
V
C
I
IN
VCA1
I
IOUT
V
C
I
IN
VCA2
I
IOUT
V
C
The SSM2164 contains four independent voltage controlled
amplifiers (VCAs) in a single package. High performance
(100 dB dynamic range, 0.02% THD) is provided at a very low
cost-per-VCA, resulting in excellent value for cost sensitive gain
control applications. Each VCA offers current input and output
for maximum design flexibility, and a ground referenced
–33 mV/dB control port.
All channels are closely matched to within 0.07 dB at unity gain,
and 0.24 dB at 40 dB of attenuation. A 120 dB gain range is
possible.
A single resistor tailors operation between full Class A and AB
modes. The pinout allows upgrading of SSM2024 designs with
minimal additional circuitry.
The SSM2164 will operate over a wide supply voltage range of
±
4 V to
±
18 V. Available in 16-pin P-DIP and SOIC packages,
the device is guaranteed for operation over the extended
industrial temperature range of –40°C to +85°C.
I
IN
VCA3
I
IOUT
V
C
I
IN
VCA4
I
IOUT
POWER SUPPLY
AND BIASING CIRCUITRY
V+
GND
V–
MODE
REV. 0
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.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
SSM2164–SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
(V =
±15
V, A = 0 dB, 0 dBu = 0.775 V rms, V
S
V
= 0 dBu, R
IN
= R
OUT
= 30 kΩ, f = 1 kHz,
–40°C < T
A
< +85°C using Typical Application Circuit (Class AB), unless otherwise noted. Typical specifications apply at T
A
= +25°C.)
IN
Parameter
AUDIO SIGNAL PATH
Noise
Headroom
Total Harmonic Distortion
Conditions
V
IN
= GND, 20 kHz Bandwidth
Clip Point = 1% THD+N
2nd and 3rd Harmonics Only
A
V
= 0 dB, Class A
A
V
=
±
20 dB, Class A
1
A
V
= 0 dB, Class AB
A
V
=
±
20 dB, Class AB
1
C
F
= 10 pF
C
F
= 10 pF
V
IN
= 0
Min
SSM2164
Typ
Max
–94
22
0.02
0.15
0.16
0.3
–110
500
0.7
±
10
±
50
±
0.1
5
–33
–3300
1.5
0.07
0.24
–100
+20
.1
Units
dBu
dBu
%
%
%
%
dB
kHz
mA/µs
nA
nA
V
kΩ
mV/dB
ppm/°C
mV
dB
dB
dB
dB
V
mA
dB
Channel Separation
Unity Gain Bandwidth
Slew Rate
Input Bias Current
Output Offset Current
Output Compliance
CONTROL PORT
Input Impedance
Gain Constant
Gain Constant Temperature Coefficient
Control Feedthrough
Gain Matching, Channel-to-Channel
Maximum Attenuation
Maximum Gain
POWER SUPPLIES
Supply Voltage Range
Supply Current
Power Supply Rejection Ratio
NOTES
1
–10 dBu input @ 20 dB gain; +10 dBu input @ –20 dB gain.
2
After 60 seconds operation.
3
+25°C to +85°C.
Specifications subject to change without notice.
(Note 2)
0 dB to –40 dB Gain Range
3
A
V
= 0 dB
A
V
= –40 dB
8.5
±
4
Class AB
60 Hz
6
90
±
18
8
TYPICAL APPLICATION AND TEST CIRCUIT
V
C
V
C4
100pF
14
I
IN
30kΩ
V
IN4
500Ω
560pF
15
13 I
IOUT
VCA4
30kΩ
1/2
OP275
V
OUT4
POWER SUPPLY
AND BIASING CIRCUITRY
9
V–
8
16
GND
V+
1
MODE
R
B
(7.5kΩ CLASS A)
(OPEN CLASS AB)
0.1µF 0.1µF
–15V
+15V
Figure 1. R
IN
= R
OUT
= 30 k
Ω
, C
F
= 100 pF. Optional R
B
= 7.5 k
Ω
, Biases Gain Core to Class A Opera-
tion. For Class AB, Omit R
B
.
–2–
REV. 0
SSM2164
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Input, Output, Control Voltages . . . . . . . . . . . . . . . . V– to V+
Output Short Circuit Duration to GND . . . . . . . . . Indefinite
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . –40°C to +85°C
Junction Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C
Package Type
16-Pin Plastic DIP (P Suffix)
16-Pin SOIC (S Suffix)
θ
JA
*
76
92
θ
JC
33
27
Units
°C/W
°C/W
ORDERING GUIDE
Model
SSM2164P
SSM2164S
Temperature
Range
–40°C to +85°C
–40°C to +85°C
Package
Description
Plastic DIP
Narrow SOIC
Package
Options
N-16
R-16A
PIN CONFIGURATION
16-Lead Epoxy DIP and SOIC
*θ
JA
is specified for the worst case conditions; i.e.,
θ
JA
is specified for device in socket
for P-DIP packages,
θ
JA
is specified for device soldered in circuit board for SOIC
package.
MODE
I
IN1
V
C1
I
OUT1
I
OUT2
V
C2
I
IN2
GND
1
2
3
4
5
6
7
8
16 V+
15 I
IN4
14 V
C4
13 I
OUT4
TOP VIEW
12 I
OUT3
(Not to Scale)
11 V
C3
10 I
IN3
9
V–
SSM2164
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the SSM2164 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–
SSM2164
Typical Performance Characteristics
1.0
CLASS A
V
S
=
±15V
LPF = 80kHz
THD + N – %
A
V
= + 20dB
0.1
A
V
= – 20dB
A
V
= 0dB
0.01
20
100
1k
FREQUENCY – Hz
10k
20k
210
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0.00 0.05
0.10
0.15
0.20 0.25
THD – %
V
S
=
±15V
T
A
= +25°C
1200 CHANNELS
UNITS
0.30
0.35
0.40
0.45
Figure 2. THD+N vs. Frequency, Class A
Figure 5. THD Distribution, Class AB
1.0
CLASS AB
V
S
=
±15V
LPF = 80kHz
A
V
= +20dB
THD + N – %
A
V
= –20dB
1.0
V
S
±15V
A
V
= 0dB
LPF = 22kHz
THD + N – %
0.1
A
V
= 0dB
CLASS AB
0.1
CLASS A
0.01
20
100
1k
FREQUENCY – Hz
10k
20k
0.01
20
100
1k
AMPLITUDE – V
RMS
10k
20k
Figure 3. THD+N vs. Frequency Class, AB
Figure 6. THD+N vs. Amplitude
300
280
260
240
220
200
V
S
=
±15V
T
A
= +25°C
1200 CHANNELS
0.10
LPF = 80kHz
0.08
THD + N – %
180
UNITS
0.06
160
140
120
100
80
60
40
20
0
0.005 0.010
0.04
0.02
0
0.015
0.020 0.025 0.030
THD – %
0.035 0.040 0.045 0.050
0
±4
±8
±12
±16
±20
SUPPLY – Volts
Figure 4. THD Distribution, Class A
Figure 7. THD+N vs. Supply Voltage, Class A
–4–
REV. 0
SSM2164
1000
0.030
0.025
% THD
VOLTAGE NOISE DENSITY – nV/
V
S
=
±15V
V
IN
= 0dBu
A
V
= 0dB
V
S
=
±15V
T
A
= +25°C
Hz
100
10
0.020
0.015
0.010
–40
–20
0
20
40
TEMPERATURE –
°C
60
80
1k
10k
R
BIAS
–
Ω
100k
1M
Figure 8. THD vs. Temperature, Class A
Figure 11. Voltage Noise Density vs. R
BIAS
1.0
0.30
V
S
=
±15V
V
IN
= 0dBu
A
V
= 0dB
V
S
=
±15V
T
A
= +25°C
0.25
% THD
0.20
THD – %
–40
–20
0
20
40
TEMPERATURE –
°C
60
80
0.1
0.15
0.10
0.01
1k
10k
R
BIAS
–
Ω
100k
1M
Figure 9. THD vs. Temperature, Class AB
500
V
S
=
±15V
R
IN
= R
F
= 30kΩ
T
A
= +25°C
10
Figure 12. THD vs. R
BIAS
CONTROL FEEDTHROUGH – mV
400
5
V
S
=
±15V
T
A
= +25°C
Hz
0
300
NOISE – nV/
–5
200
–10
100
–15
0
1
10
100
1k
FREQUENCY – Hz
10k
100k
–20
1k
10k
R
BIAS
–
Ω
100k
1M
Figure 10. Voltage Noise Density vs. Frequency, Class AB
Figure 13. Control Feedthrough vs. R
BIAS
REV. 0
–5–
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