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SSM2163
Digitally Controlled 8 x 2 Audio Mixer
REV.0Digitally Controlled
8 3 2 Audio Mixer
FEATURES
Each of 8 Inputs Can Be Assigned to Either or Both
Outputs
Voltage Inputs and Outputs – No Need For External
Amplifiers
Each Input Provides 63 dB of Attenuation in 1 dB Steps,
Plus Mute
–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
SSM2163s
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
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), withdBu of headroom resulting in total dynamic range of 92dBu.
Total harmonic distortion plus noise is 0.007% at 1kHz with all
levels set at unity gain.
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.
SIMPLIFIED BLOCK DIAGRAM
ELECTRICAL SPECIFICATIONS
Specifications subject to change without notice.
SSM2163–SPECIFICATIONS
(VS = 65 V, AV = 0 dB, VIN = 0 dBu = 0.775 V rms, fAUDIO = 1 kHz, fCLK = 250 kHz, RL = 100 kV,
–408C < TA < +858C, unless otherwise noted. Typical specifications apply at TA = +258C.)
Timing Description
NOTESAn idle HI (CLK-HI) or idle LO (CLK-LO) clock may be used. Data is latched on the positive
edge.For SPI or microwire three-wire bus operation, tie LD to WRITE and use WRITE pulse to drive
both pins. (This generates an automatic internal LD signal.)If an idle HI clock is used, tCW and tWL are measured from the final negative transition to the idle
state.The first data byte selects an address (MSB HI), and subsequent MSB LO states set gain levels. Re-
fer to the Address/Data Decoding Truth Table.Data must be sent MSB first.
DATA
CLK
DATA
CLK
SDO
tW3
WRITE & LOAD
WRITE & LOAD
SSM2163
DATA
WRITE
CLK
DATA
CLK
SDO
WRITE
LOAD
Figure 2.Four-Wire Mode Timing Diagram
ABSOLUTE MAXIMUM RATINGS1
Supply Voltage
Dual Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±8 V
Single Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +16 V
Analog Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Logic Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA
Operating Temperature Range . . . . . . . . . . . . –40°C to +85°C
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . . +150°C
Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . . +300°C
THERMAL CHARACTERISTICS
Thermal Resistance2
28-Pin Plastic DIP (SSM2163P)
θJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48°C/W
θJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22°C/W
28-Pin SOIC (SSM2163S)
θJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68°C/W
θJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20°C/W
TRANSISTOR COUNT
Number of Transistors . . . . . . . . . . . . . . . . . .1711 MOSFETs
447 BJTs
ESD RATINGS
883 (Human Body) Model . . . . . . . . . . . . . . . . . . . . . .1000 V
NOTESStresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the
operation section of this specification is not implied. Exposure to absolute maxi-
mum rating conditions for extended periods may affect device reliability.θJA is specified for worst-case conditions, i.e., θJA is specified for device in socket
for P-DIP and device soldered in circuit board for SOIC package.
ORDERING GUIDE
PIN CONFIGURATIONS
Epoxy Plastic DIP (P-Suffix)
and SOIC (S-Suffix)
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the SSM2163 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
SSM2163
PIN DESCRIPTION
4VDD
–61dB
–62dB
–63dB
Figure 3.Address and Data Decoding Truth Table
AMPLITUDE – dBr
AMPLITUDE – V rms
THD + N – %
0.10.010
Figure 5.THD+N vs. Amplitude
FREQUENCY – kHz
dBu
TA = +25°C
Figure 7.(THD+N) = 1 kHz Tone at 0 dBu (4k-Point FFT)
SSM2163
THD + N – %
THD + N – %
0.005
Figure 9.THD+N vs. Frequency – Single Supply
AMPLITUDE – V rms
THD + N – %
0.010

Partno	Mfg	Dc	Qty	Available	Descript
SSM2163	AD	N/a	43	avai	Digitally Controlled 8 x 2 Audio Mixer