Analog Devices SSM2164 Datasheet

Low Cost Quad

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

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.

Voltage Controlled Amplifier

SSM2164

FUNCTIONAL BLOCK DIAGRAM

V

C

I

IN

V

C

I

IN

V

C

I

IN

V

C

I

IN

AND BIASING CIRCUITRY

V+ GND V– MODE

VCA1

VCA2

VCA3

VCA4

POWER SUPPLY

I

IOUT

I

IOUT

I

IOUT

I

IOUT

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: [phone] Fax: [phone]

SSM2164–SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

(VS = ±15 V, AV = 0 dB, 0 dBu = 0.775 V rms, VIN = 0 dBu, RIN = R

= 30 kΩ, f = 1 kHz,

OUT

–40°C < TA < +85°C using Typical Application Circuit (Class AB), unless otherwise noted. Typical specifications apply at TA = +25°C.)

SSM2164

Parameter Conditions Min Typ Max Units

AUDIO SIGNAL PATH

Noise V

= GND, 20 kHz Bandwidth –94 dBu

IN

Headroom Clip Point = 1% THD+N 22 dBu
Total Harmonic Distortion 2nd and 3rd Harmonics Only

A

= 0 dB, Class A 0.02 .1 %

V

A

= ±20 dB, Class A

V

A

= 0 dB, Class AB 0.16 %

V

A

= ±20 dB, Class AB

V

1

1

0.15 %

0.3 %
Channel Separation –110 dB
Unity Gain Bandwidth C
Slew Rate C

= 10 pF 500 kHz

F

= 10 pF 0.7 mA/µs

F

Input Bias Current ±10 nA
Output Offset Current V

= 0 ±50 nA

IN

Output Compliance ±0.1 V

CONTROL PORT

Input Impedance 5kΩ
Gain Constant (Note 2) –33 mV/dB
Gain Constant Temperature Coefficient –3300 ppm/°C
Control Feedthrough 0 dB to –40 dB Gain Range
Gain Matching, Channel-to-Channel A

= 0 dB 0.07 dB

V

A

= –40 dB 0.24 dB

V

3

1.5 8.5 mV

Maximum Attenuation –100 dB
Maximum Gain +20 dB

POWER SUPPLIES

Supply Voltage Range ±4 ±18 V
Supply Current Class AB 6 8 mA
Power Supply Rejection Ratio 60 Hz 90 dB

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.

TYPICAL APPLICATION AND TEST CIRCUIT

V

C

V

C4

V

IN4

30kΩ

500Ω

560pF

14

15

I

IN

POWER SUPPLY

AND BIASING CIRCUITRY

98

V– GND V+ MODE

0.1µF 0.1µF

VCA4

16 1

+15V–15V

13

R

B

100pF

IOUT

30kΩ

1/2

OP275

I

(7.5kΩ CLASS A)
(OPEN CLASS AB)

V

OUT4

Figure 1. RIN = R

= 30 kΩ, CF = 100 pF. Optional RB = 7.5 kΩ, Biases Gain Core to Class A Opera-

OUT

tion. For Class AB, Omit R

.

B

–2–

REV. 0

SSM2164

MODE

I

IN1

V+
I

IN4

I

OUT2

V

C2

I

IN2

I

OUT3

V

C3

I

IN3

V

C1

I

OUT1

V

C4

I

OUT4

GND V–

1
2

16
15

5
6
7

12
11
10

3
4

14
13

89

TOP VIEW

(Not to Scale)

SSM2164

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

ORDERING GUIDE

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

Model Range Description Options

SSM2164P –40°C to +85°C Plastic DIP N-16
SSM2164S –40°C to +85°C Narrow SOIC R-16A

Temperature Package Package

Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C

Package Type θJA* θ

JC

16-Pin Plastic DIP (P Suffix) 76 33 °C/W

Units

PIN CONFIGURATION

16-Lead Epoxy DIP and SOIC

16-Pin SOIC (S Suffix) 92 27 °C/W

*θ

is specified for the worst case conditions; i.e., θJA is specified for device in socket

JA

for P-DIP packages, θJA is specified for device soldered in circuit board for SOIC
package.

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.

REV. 0

–3–

SSM2164

210

200
190
180
170

160
150
140
130

120
110
100

90
80
70
60
50
40
30
20
10

0

UNITS

0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45
THD – %

V

S

= ±15V

T

A

= +25°C

1200 CHANNELS

Typical Performance Characteristics

1.0
CLASS A

= ±15V

V

S

LPF = 80kHz

AV = + 20dB

0.1

THD + N – %

0.01
20 100

FREQUENCY – Hz

AV = – 20dB

AV = 0dB

1k 10k

Figure 2. THD+N vs. Frequency, Class A

1.0
CLASS AB

= ±15V

V

S

LPF = 80kHz

0.1

THD + N – %

AV = +20dB

AV = –20dB

AV = 0dB

20k

Figure 5. THD Distribution, Class AB

1.0
VS ±15V

A

= 0dB

V

LPF = 22kHz

0.1

THD + N – %

CLASS AB

CLASS A

0.01
20 100

FREQUENCY – Hz

Figure 3. THD+N vs. Frequency Class, AB

300
280
260
240
220
200
180
160
140

UNITS

120
100

80
60
40
20

0

0.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 0.050
THD – %

Figure 4. THD Distribution, Class A

1k 10k

VS = ±15V

= +25°C

T

A

1200 CHANNELS

20k

–4–

0.01
20 100

AMPLITUDE – V

1k 10k

RMS

Figure 6. THD+N vs. Amplitude

0.10

LPF = 80kHz

0.08

0.06

0.04

THD + N – %

0.02

0

0

±4

SUPPLY – Volts

±16±12±8

Figure 7. THD+N vs. Supply Voltage, Class A

20k

±20

REV. 0