SSM2164 Analog Devices, SSM2164 Datasheet

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SSM2164

Manufacturer Part Number
SSM2164
Description
Low Cost Quad Voltage Controlled Amplifier
Manufacturer
Analog Devices
Datasheet

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a
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
the device is guaranteed for operation over the extended
industrial temperature range of –40 C to +85 C.
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.
4 V to 18 V. Available in 16-pin P-DIP and SOIC packages,
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
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Voltage Controlled Amplifier
V
V
V
V
I
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IN
IN
IN
FUNCTIONAL BLOCK DIAGRAM
IN
C
C
C
C
V+
AND BIASING CIRCUITRY
POWER SUPPLY
GND
VCA1
VCA2
VCA3
VCA4
V–
Low Cost Quad
MODE
SSM2164
Fax: 617/326-8703
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IOUT
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IOUT
IOUT

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SSM2164 Summary of contents

Page 1

... 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 Available in 16-pin P-DIP and SOIC packages, the device is guaranteed for operation over the extended industrial temperature range of – ...

Page 2

... MODE 0.1µF 0.1µF R (7.5k B (OPEN CLASS AB) –15V +15V = 100 pF. Optional Biases Gain Core to Class A Opera –2– dBu kHz OUT = +25 C.) A SSM2164 Min Typ Max –94 22 0.02 .1 0.15 0.16 0.3 –110 500 0 0.1 5 –33 –3300 1.5 8.5 0.07 0.24 – ...

Page 3

... 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 ...

Page 4

... SSM2164 Typical Performance Characteristics 1.0 CLASS 15V S LPF = 80kHz 20dB V 0 – 20dB V A 0.01 20 100 1k FREQUENCY – Hz Figure 2. THD+N vs. Frequency, Class A 1.0 CLASS AB V LPF = 80kHz A = –20dB +20dB 0dB 0.1 V 0.01 20 100 1k FREQUENCY – Hz Figure 3. THD+N vs. Frequency Class, AB 300 280 ...

Page 5

... Figure 11. Voltage Noise Density vs. R 1.0 0.1 0. 15V 30k + –5 –10 –15 –20 1k 10k 100k Figure 13. Control Feedthrough vs. R –5– SSM2164 V = 15V + 10k 100k R – BIAS BIAS V = 15V + 10k 100k R – BIAS Figure 12. THD vs. R BIAS V = 15V + 10k 100k R – ...

Page 6

... SSM2164 Typical Performance Characteristics 15 PHASE 15V + 0dB 10pF F GAIN 0 –5 –10 –15 1k 10k 100k FREQUENCY – Hz Figure 14. Gain/Phase vs. Frequency 0 100pF F –0 15V + –0 0dB V –0.3 –0.4 10 100 1k FREQUENCY – Hz Figure 15. Gain Flatness vs. Frequency +20dB 0dB –20dB V –20 –40 –60 100 1k 10k 100k FREQUENCY – ...

Page 7

... The MODE pin allows the setting of the quiescent current in the gain core of the VCA to trade off the SSM2164’s THD and noise performance to an optimal level for a particular applica- tion. Higher current through the core results in lower distortion – ...

Page 8

... With 15 V supplies 7.5k gives Class A biasing with a B current of 1.9 mA. Leaving the MODE pin open sets the SSM2164 in Class AB with current in the gain core. Basic VCA Configuration Figure 24 shows the basic application circuit for the SSM2164. Each of the four channels is configured identically resistor converts the input voltage to an input current for the VCA ...

Page 9

... Since the SSM2164 has a –33 mV/dB gain con- stant, the overall control law is 0.12 dB/bit or approximately 8 bits/dB. The input and output configuration for the SSM2164 is the same as for the basic VCA circuit shown earlier. The 4-to-1 mixer configuration could also be used. +15V ...

Page 10

... Since both parts are current output devices, the output configu- ration is nearly identical, except that the 10 k resistors should be increased operate the SSM2164 in its optimum range. The 10 k input resistor for the SSM2024 should also be increased match the output resistor. Addition- ally, the 200 series with 560 pF for the SSM2164 circuit ...

Page 11

... BSC –11– SSM2164 0.325 (8.25) 0.300 (7.62) 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) 0.0196 (0.50 0.0099 (0.25 0.0500 (1.27) ...

Page 12

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