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SSM2160SZ
6-Channel, Clickless Serial Input Balance/Master Volume Control
REV.A
6-Channel, Serial Input
Master/Balance Volume Controls
FEATURES
Clickless Digitally Controlled Level Adjustment
SSM2160: 6 Channels
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:
0.01% THD+N
0.001% IMD (SMPTE)
–90 dBu Noise Floor
–80 dB Channel Separation
90 dB SNR
Single-and Dual-Supply Operation
APPLICATIONS
Home Theater Receivers
Surround Sound Decoders
Circle Surround® and AC-3® Decoders
DSP Soundfield™ Processors
HDTV and Surround TV Audio Systems
Automotive Surround Sound Systems
Multiple Input Mixer Consoles and Amplifiers
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTIONThe 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® software and an
evaluation board for controlling the SSM2160 are available.
The SSM2160 can be operated from single supplies of +10V 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.
SSM2160–SPECIFICATIONS
(VS = �6 V, TA = 25�C, AV = 0 dB, fAUDIO = 1 kHz, fCLOCK = 250 kHz,
RL = 10 k�, unless otherwise noted.)ANALOG OUTPUT
MASTER ATTENUATOR ERROR
VOLTAGE REFERENCE
NOTESMaster = 0 dB; Channel = 0 dB.Input level adjusted accordingly. 0 dBu = 0.775 V rms.For other than ±10 V supplies, maximum is VS/4.
Specifications subject to change without notice.
SSM2160
TIMING CHARACTERISTICStCH
tDS
tDH
tCW
tWC
tLW
tWL
NOTESAn idle HI (CLK-HI) or idle LO (CLK-LO) clock may be used. Data is latched on the negative edge.For SPI™ or Microwire™ 3-wire bus operation, tie LD to WRITE and use WRITE pulse to drive both pins. (This generates an automatic internal load 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/attenuation levels. Refer to the Address/Data Decoding Truth Table.Data must be sent MSB first.
Figure 1.Timing Diagrams
SSM2160
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
ABSOLUTE MAXIMUM RATINGS1Supply Voltage
Dual Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Single2 (VS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 V
Logic Input Voltage . . . . . . . . . . . . . . . . . . . . . .–0.3 V to +5 V
Operating Temperature Range . . . . . . . . . . . . . . .0°C to 70°C
Storage Temperature Range . . . . . . . . . . . . .–65°C to +150°C
Junction Temperature Range . . . . . . . . . . . . .–65°C to +165°C
Lead Temperature Range (Soldering, 60 sec) . . . . . . . .300°C
ESD Ratings883 (Human Body) Model . . . . . . . . . . . . . . . . . . . . . .2.5 kV
PACKAGE THERMAL INFORMATIONNOTESAbsolute maximum ratings apply at 25°C, unless otherwise noted.VS is the total supply span from V+ to V–.�JA is specified for the worst-case conditions for device soldered onto a circuit
board for SOIC packages.
PIN CONFIGURATION
24-Lead SOIC
ORDERING GUIDE
PIN FUNCTION DESCRIPTIONSSSM2160–Typical Performance CharacteristicsTPC 1.THD vs. Gain
TPC 4.THD+N % vs. Frequency
TPC 2.THD+N % vs. Amplitude
TPC 5.Channel Separation
vs. Frequency
TPC 7.Noise vs. Gain
TPC 3.THD+N % vs. Amplitude
TPC 6.Mute vs. Frequency
TPC 8.THD vs. Frequency (FFT)
TPC 11.SMPTE IM vs.
Amplitude V rms
TPC 9.THD vs. Frequency (FFT)
TPC 12.Noise Floor FFT
TPC 14.ISY vs. VS
TPC 10.THD vs. Frequency (FFT)
TPC 13.PSR vs. Frequency
SSM2160
APPLICATIONS INFORMATION
GeneralThe SSM2160 is a 6-channel volume control intended for
multichannel audio applications. While dual-channel controls
sufficed for stereo applications, rapidly emerging home theater
surround sound and auto sound venues demand both 4-channel
and 6-channel high performance controls. Line level signals are fed
to the six high impedance inputs. The system microcontroller
sets the gain of the six channels via a 3-wire or 4-wire data bus.
In a home theater receiver, the outputs may be fed to the power
amplifiers or buffered and connected to pre-out/amp-in ports on
the rear panel. Refer to Figure 5 for a typical signal chain using
the SSM2160. The master control serves the volume control
function, and the channel control serves the balance function.
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 LevelsThe SSM2160 can be operated from dual supplies from ±5V to
±10V and from single supplies from +10V to +20V. To keep
power dissipation to a minimum, use the minimum power supply
voltages that will support the maximum input and output signal
levels. The peak-to-peak output signal level must not exceed 1/4
of the total power supply span, from V+ to V–. This restriction
applies for all conditions of input signal levels and gain/attenuation
settings. Table I shows supply voltages for several typical output
signal levels for the device. An on-chip buffered voltage divider
provides the correct analog common voltage for single-supply
applications.
Table I.Signal Levels vs. Power Supplies
Dual Power SuppliesAs shown in Figure 2, the AGND pin should be connected to
ground and VREF should be left floating. The digital ground pin,
DGND, should always be connected to ground for either single-
or dual-supply configurations. Pins 1 and 12 should each have a
10 µF capacitor connected to ground, with a 0.1 µF capacitor
placed as close as possible to the SSM2160 to help reduce the
effects of high frequency power supply noise. When a switching
power supply is used, or if the power supply lines are noisy,
additional filtering of the power supply lines may be required.
Figure 2.Dual-Supply Configuration
Single Power SupplyWhen a single supply is used, it is necessary to connect AGND
(Pin 2) to VREF (Pin 3), as shown in Figure 3. VREF supplies a
voltage midway between the V+ and V– pins from a buffered
resistive divider. When supplying this reference to stages ahead
of the SSM2160 (to eliminate the need for input dc blocking
capacitors, for example), the use of an additional external
buffer, as shown in Figure 4, may be necessary to eliminate any
noise pickup.
Figure 3.Single-Supply Configuration
