SSM2163S Analog Devices, SSM2163S Datasheet

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SSM2163S

Manufacturer Part Number
SSM2163S
Description
Manufacturer
Analog Devices
Datasheet

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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.
GENERAL DESCRIPTION
The SSM2163 provides eight audio inputs, each of which can
be mixed under digital control to a stereo output. Each input
channel can be attenuated up to 63 dB in 1 dB intervals, plus
fully muted. Additionally, any input can be assigned to either or
both outputs. A standard 3-wire serial interface is employed,
plus a Data Out terminal to facilitate daisy chaining of multiple
mixer ICs. No external components are required for normal
operation.
Excellent audio performance is attained. The SSM2163 has a
signal-to-noise ratio of –82 dBu (0 dBu = 0.775 V rms), with
10 dBu of headroom resulting in total dynamic range of 92 dBu.
Total harmonic distortion plus noise is 0.007% at 1 kHz with all
levels set at unity gain.
FEATURES
Each of 8 Inputs Can Be Assigned to Either or Both
Voltage Inputs and Outputs – No Need For External
Each Input Provides 63 dB of Attenuation in 1 dB Steps,
–82 dBu Signal-to-Noise Ratio (0 dBu = 0.775 V rms)
+10 dBu of Headroom
0.007% THD+N (Unity Gain, @ 1 kHz, 0 dBu)
Power-Up/System Mute Feature
Industry-Standard 3-Wire Serial Interface
Data Out Terminal Permits Daisy Chaining of Multiple
Single or Dual Supply Operation
28-Pin Plastic DIP and SOIC Package
APPLICATIONS
Multimedia System Mixing
Audio Mixing Consoles
Broadcast Equipment
Intercom/Paging Systems
Musical Instruments
Plus Mute
SSM2163s
Outputs
Amplifiers
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
The SSM2163 can be operated from single (+5 V to +14 V) or
dual ( 4 V to 7 V) supplies, and is housed in 28-pin plastic
DIP and SOIC packages.
The SSM2163 is an ideal companion product to the Analog
Devices family of stereo codecs in high performance multi-
media systems requiring mixing of multiple signals.
V
V
V
V
V
V
V
V
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
SIMPLIFIED BLOCK DIAGRAM
DCA: DIGITALLY CONTROLLED ATTENUATOR
DCA
DCA
DCA
DCA
DCA
DCA
DCA
DCA
Digitally Controlled
8
GENERATOR
REFERENCE
SWITCHING
SSM2163
NETWORK
REGISTER
VOLTAGE
ADDRESS
DECODER
OUTPUT
SHIFT
AND
2 Audio Mixer
© Analog Devices, Inc., 1995
SSM2163
Fax: 617/326-8703
V
V
V
CLK
ACOM
AGND
V
SYSTEM MUTE
DATA OUT
DATA
LD
WRITE
DGND
V
V
CC
EE
OUTL
OUTR
SS
DD

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SSM2163S Summary of contents

Page 1

... Headroom 0.007% THD+N (Unity Gain kHz, 0 dBu) Power-Up/System Mute Feature Industry-Standard 3-Wire Serial Interface Data Out Terminal Permits Daisy Chaining of Multiple SSM2163s Single or Dual Supply Operation 28-Pin Plastic DIP and SOIC Package APPLICATIONS Multimedia System Mixing Audio Mixing Consoles ...

Page 2

SSM2163–SPECIFICATIONS ELECTRICAL SPECIFICATIONS Parameter AUDIO PERFORMANCE Noise Headroom Total Harmonic Distortion Plus Noise ANALOG INPUT Input Impedance VOLUME CONTROL Step Size Gain Error Gain Match Error Mute Attenuation ANALOG OUTPUT Output Impedance Output Current Minimum Resistive Load Maximum Capacitive Drive ...

Page 3

Timing Symbol Description t Input Clock Pulse Width CL t Input Clock Pulse Width CH t Data Setup Time DS t Data Hold Time DH t Positive CLK Edge to End of Write CW t Write to Clock Setup Time ...

Page 4

SSM2163 1 CLK 0 1 DATA WRITE CLK DATA WRITE 0 1 LOAD 0 1 SDO ...

Page 5

... C J Lead Temperature (Soldering, 60 sec +300 C THERMAL CHARACTERISTICS 2 Thermal Resistance 28-Pin Plastic DIP (SSM2163P C C/W JC 28-Pin SOIC (SSM2163S C C/W JC TRANSISTOR COUNT Number of Transistors . . . . . . . . . . . . . . . . . . 1711 MOSFETs ESD RATINGS 883 (Human Body) Model . . . . . . . . . . . . . . . . . . . . . . 1000 V NOTES 1 Stresses above those listed under “ ...

Page 6

... Function 1 DGND Digital Ground Digital Negative Supply DATA OUT Serial data output clocked on positive clock edge. Connect DATA OUT to DATA IN pin to daisy-chain multiple SSM2163s. Output levels are Digital Positive Supply Audio Signal Input 1. IN1 6 NC (Shield) Shield Pin. Should be tied to AGND to minimize crosstalk. ...

Page 7

LPF = 22kHz –60. 100k + –70.00 –80.00 20 100 1k FREQUENCY – Hz Figure 4. Frequency Response ...

Page 8

SSM2163 0dBu 0dB V LPF = 22kHz R = 100k 0 + 0.010 0.001 20 100 1k FREQUENCY – Hz Figure 8. THD+N vs. Frequency ...

Page 9

LOAD 100 Figure 14. Large Signal Transient Response 100 LOAD Figure 15. ...

Page 10

SSM2163 THEORY OF OPERATION The SSM2163 is an eight-input, two-output audio mixer and attenuator. The device provides eight analog inputs, each of which can be individually attenuated steps (see the SSM2163 ...

Page 11

0 AGND (NC) ACOM V– 0 DGND Figure 22a. Dual Supply stored in the attenuator control registers. ...

Page 12

SSM2163 MIXER MIXER SUMMING BUFFER AMP ATTENUATOR AMPLIFIER V MIXER IN SWITCH CHANNEL SELECT R1= Figure 23. Single-Supply Pseudo-Ground Reference (ACOM) Generator For single supply operation, the inputs can either be ac-coupled, as shown ...

Page 13

... SSM2163s can be paralleled to provide additional channels. A typical circuit is shown in Figure 26, which combines two SSM2163s to form a 16-input, 2-output mixer. An SSM2135 dual audio op amp sums the outputs of each of the SSM2163s. With this system, any of the 16 inputs can be mixed into either or both of the output channels. ...

Page 14

... WRITE input is low. However, the data will not be latched into the SSM2163’s internal registers until the rising edge of the LOAD input. In this manner, any number of SSM2163s can be loaded with data, while the amplitude and mixer changes will not occur until the separate LOAD pulse occurs. ...

Page 15

Listing 1. Software for the 80C51-SSM2163 Serial Port Interface ; This subroutine loads an SSM2163 mixer channel with a 6-bit ; attenuator value, and turns the Left or Right mixer switch ON or OFF. ; The attenuator value is stored ...

Page 16

SSM2163 number stored in LEVEL_VALUE is the attenuation value, expressed in –dB, so larger values will decrease volume. Also, the register must not be allowed to increment beyond 7FH because the MSB will be set and the SSM2163 will interpret ...

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