SSM2160 Analog Devices, SSM2160 Datasheet

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SSM2160

Manufacturer Part Number
SSM2160
Description
6-Channel, Clickless Serial Input Balance/Master Volume Control
Manufacturer
Analog Devices
Datasheet

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GENERAL DESCRIPTION
The SSM2160 allows digital control of volume of six audio
channels, with a master level control and individual channel
controls. Low distortion VCAs (voltage controlled amplifiers) are
used in the signal path. By using controlled rate-of-change drive
to the VCAs, the “clicking” associated with switched resistive
networks is eliminated in the master control. Each channel is
controlled by a dedicated 5-bit DAC providing 32 levels of gain.
A master 7-bit DAC feeds every control port giving 128 levels of
attenuation. Step sizes are nominally 1 dB and can be changed by
external resistors. Channel balance is maintained over the entire
master control range. Upon power-up, all outputs are automati-
cally muted. A 3-wire or 4-wire serial data bus enables interfacing
with most popular microcontrollers. Windows
evaluation board for controlling the SSM2160 are available.
The SSM2160 can be operated from single supplies of +10 V to
+20 V or dual supplies from ± 5 V to ±10 V. An on-chip reference
provides the correct analog common voltage for single-supply
applications. The SSM2160 comes in a SOIC package; see the
Ordering Guide for details.
REV. A
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
FEATURES
Clickless Digitally Controlled Level Adjustment
7-Bit Master Control Gives 128 Levels of Attenuation
5-Bit Channel Controls Give 32 Levels of Gain
Master/Channel Step Size Set by External Resistors
100 dB Dynamic Range
Automatic Power-On Mute
Excellent Audio Characteristics:
Single-and Dual-Supply Operation
APPLICATIONS
Home Theater Receivers
Surround Sound Decoders
Circle Surround
DSP Soundfield™ Processors
HDTV and Surround TV Audio Systems
Automotive Surround Sound Systems
Multiple Input Mixer Consoles and Amplifiers
SSM2160: 6 Channels
0.01% THD+N
0.001% IMD (SMPTE)
–90 dBu Noise Floor
–80 dB Channel Separation
90 dB SNR
®
and AC-3
®
Decoders
®
software and an
Master/Balance Volume Controls
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
WRITE
DATA
V
CLK
REF
LD
V+
V–
SHIFT REGISTER
SUPPLY AND
GENERATOR
ADDRESS
DECODER
REFERENCE
FUNCTIONAL BLOCK DIAGRAM
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
CHANNEL
MASTER
POWER
AND
7-BIT
DAC
5-BIT
5-BIT
5-BIT
5-BIT
5-BIT
5-BIT
DAC
DAC
DAC
DAC
DAC
DAC
6-Channel, Serial Input
© 2003 Analog Devices, Inc. All rights reserved.
SSM2160
VCA
VCA
VCA
VCA
VCA
VCA
SSM2160
STEP SIZE
ADJUST
www.analog.com
CH SET
MSTR SET
MSTR OUT
CH1 IN
CH2 IN
CH3 IN
CH4 IN
CH5 IN
CH6 IN
CH1 OUT
CH2 OUT
CH3 OUT
CH4 OUT
CH5 OUT
CH6 OUT

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SSM2160 Summary of contents

Page 1

... A 3-wire or 4-wire serial data bus enables interfacing with most popular microcontrollers. Windows evaluation board for controlling the SSM2160 are available. The SSM2160 can be operated from single supplies dual supplies from ± ± on-chip reference provides the correct analog common voltage for single-supply applications. The SSM2160 comes in a SOIC package ...

Page 2

... CONTROL LOGIC Logic Thresholds High (1) Low (0) Input Current Clock Frequency Timing Characteristics POWER SUPPLIES Voltage Range SSM2160 SSM2160 Supply Current NOTES 1 Master = 0 dB; Channel = 0 dB. 2 Input level adjusted accordingly. 0 dBu = 0.775 V rms. For other than ± supplies, maximum Specifications subject to change without notice. ...

Page 3

... The first data byte selects an address (MSB HI), and subsequent MSB LO states set gain/attenuation levels. Refer to the Address/Data Decoding Truth Table. 5. Data must be sent MSB first. 0 CLK 1 1 DATA WRITE CLK DATA D7 0 MSB WRITE REV Figure 1. Timing Diagrams –3– Min Typ Max 200 200 50 75 100 250 250 SSM2160 Unit ...

Page 4

... 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 SSM2160 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 5

... Audio Input to Channel 5 WRITE 10 A logic low voltage enables the SSM2160 to receive information at the DATA input (Pin 15). A logic high retains data at their previous settings (Figure 1). Serves as CHIP SELECT. LD Loads the Information Retained by WRITE into the SSM2160 at logic low (Figure 1). ...

Page 6

... SSM2160–Typical Performance Characteristics 0dBu IN 1 10k 50pF L 0.1 0.01 0.001 –70 –60 –40 – GAIN – dB TPC 1. THD vs. Gain 0 DUAL-SUPPLY OPERATION V = 300mV rms@1kHz 10k , C = 50pF L L MASTER/CHANNEL = 0dB LPF: < 22kHz V = 12V S 0. 0.001 20 100 1k 10k 30k FREQUENCY – Hz TPC 4. THD+N % vs. Frequency 1 ...

Page 7

... 12V S SMPTE 4:1 IM-FREQ 60Hz/7kHz R = 100k L 0.010 0.001 0.0001 0.05 0.1 1.0 5.0 INPUT AMPLITUDE – V rms TPC 11. SMPTE IM vs. Amplitude V rms REV. A Typical Performance Characteristics–SSM2160 – 12V S – –31dBu @ 1Hz IN – 100k L –40 MASTER = 0dB –50 CHANNEL = 0dB –60 – ...

Page 8

... The 6-channel capability allows complete control of the front left, front right, center, rear left, rear right, and sub-bass audio channels. Power Supplies vs. Signal Levels The SSM2160 can be operated from dual supplies from ± ± and from single supplies from + + keep power dissipation to a minimum, use the minimum power supply voltages that will support the maximum input and output signal levels ...

Page 9

... When configuring the system, the SSM2160 should be in the signal chain where input signals allow the minimum VCA gain to be used, thus ensuring the lowest distortion operation. In consumer products, sources that supply line level signals include FM/AM tuner, phono preamp, cassette deck, CD, laser disk, VCR, LINE, AUX, and microphone preamp ...

Page 10

... Saturation Prevention Unlike a passive potentiometer, the SSM2160 can give gain, thereby creating a potential for saturating the VCAs, resulting in an undesirable clipping or overload condition. Care- ful choice of input signal levels and digital gain parameters will eliminate the possibility. A few of the many acceptable gain and attenuation settings that keep the signals within the prescribed limits are shown in Table III ...

Page 11

... Muting The SSM2160 offers master and channel muting. On power-up, the master mute is activated, thus preventing any transients M from entering the signal path and possibly overloading amplifi- ers down the signal path. Mute is typically better than –95 dB relative dBu input. Due to design limitations, the indi- is found to be 1700 Ω ...

Page 12

... This will be the case if the source is from an op amp that uses dual power supplies (i.e., ± 6 V), and the SSM2160 uses a single supply. If the signal source has the capability of operating with an externally supplied signal, connect the V (Pin 3) to the source’ ...

Page 13

... RCA-type audio connectors. A stereo headphone driver socket is provided for the convenience of listening to Channels 1 and 2. Microsoft Windows software is available for controlling the serial data bus of the SSM2160 via the parallel port driver (LPT PC. The software may be downloaded from the Analog Devices mW website at www.analog.com. The evaluation board comes com- plete with the necessary parallel port cable and telephone type plug that mates with the evaluation board ...

Page 14

... Halt Halt is a software interrupt in case of a problem or to stop a long fade time. Update Data currently on display is resent to the SSM2160. This is useful when parts are being substituted in the evaluation board, or when the interface cable is changed. –14– REV. A ...

Page 15

... BSC 0.33 (0.013) 0.23 (0.0091) COMPLIANT TO JEDEC STANDARDS MS-013AD CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN –15– SSM2160 0.75 (0.0295) 45 0.25 (0.0098 1.27 (0.0500) 0.40 (0.0157) ...

Page 16

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