SSM2160P-SSM2160S-SSM2160S-REEL-SSM2161P Fast Delivery |IC PHOENIX CO.,LIMITED

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SSM2160P-SSM2160S-SSM2160S-REEL-SSM2161P
6- and 4-Channel, Serial Input Master/Balance Volume Controls
REV.0
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Clickless Digitally Controlled Level Adjustment
SSM2160: Six Channels
SSM2161: Four 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
GENERAL DESCRIPTION
The SSM2160 and SSM2161 allow digital control of volume of
six and four audio channels, respectively, 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 “click-
ing” 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 automatically
muted. A three- or four-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 +10 V to
+20 V or dual supplies from ±5 V to ±10 V. The SSM2161 can
be operated from single supplies of +8.5 V to +20 V (for
automotive applications) or dual supplies from ±4.25 V to10 V. An on-chip reference provides the correct analog
common voltage for single supply applications. Both models
come in P-DIP and SO packages. See the Ordering Guide for
more details.*Circle Surround is a registered trademark of Rocktron Corporation.
AC-3 is a registered trademark of Dolby Labs, Inc. Windows is a regis-
tered trademark of Microsoft Corp.
SSM2160/SSM2161–SPECIFICATIONS
(VS = 66 V, TA = +258C, AV = 0 dB, fAUDIO = 1 kHz, fCLOCK =
250 kHz, RL = 10 kV, unless otherwise noted)
ANALOG INPUT
MASTER ATTENUATOR ERROR
CHANNEL GAIN ERROR
POWER SUPPLIES
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.
Timing Characteristics
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 three-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.
CLK
DATA
WRITE
CLK
DATA
WRITE
Figure 1.Timing Diagrams
SSM2160/SSM2161
ABSOLUTE MAXIMUM RATINGS1
Supply Voltage
Dual Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Single . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+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 Ratings
883 (Human Body) Model . . . . . . . . . . . . . . . . . . . . . .2.5 kV
PACKAGE THERMAL INFORMATION
24-Pin Plastic P-DIP
24-Pin SOIC
20-Pin Plastic P-DIP
NOTES
1Absolute maximum ratings apply at +25°C unless otherwise noted.
2VS is the total supply span from V+ to V–.
3θJA is specified for the worst case conditions, i.e., for device in socket for P-DIP,
packages and for device soldered onto a circuit board for SOIC packages.
ORDERING GUIDE
PIN CONFIGURATIONS
24-Lead Epoxy DIP and SOIC
TOP VIEW
(Not to Scale)SSM2160
VOUT2
MSTR SET
MSTR OUT
CH SET
AGND
VREF
VOUT1
VIN4
VOUT4
VIN2VIN1
VOUT3
VIN3
VOUT5
VIN5
WRITEDATA
VIN6
VOUT6
CLK
DGND
20-Lead Epoxy DIP and SOIC
PIN DESCRIPTIONS
SSM2160/SSM2161
–Typical Performance Characteristics
GAIN – dB
THD+N – %
Figure 2.THD vs. Gain
FREQUENCY – Hz
0.0130k1001k10k
THD+N – %
0.001
Figure 5.THD+N % vs. Frequency
INPUT VOLTAGE – Vrms
THD+N – %
1.0
Figure 3.THD+N % vs. Amplitude
FREQUENCY – Hz
–8020k1001k10k
CHANNEL SEPARATION – dB
–110
Figure 6.Channel Separation vs.
Frequency
GAIN – dB
NOISE – dBu
–75
Figure 8.Noise vs. Gain
INPUT VOLTAGE – Vrms
THD+N – %
0.01
Figure 4.THD+N % vs. Amplitude
FREQUENCY – Hz
–11030k100
OUTPUT – dB10k
Figure 7.Mute vs. Frequency
FREQUENCY – kHz
AMPLITUDE – dBu
Figure 9a.THS vs. Frequency (FFT)
INPUT AMPLITUDE – Vrms
1MD (SMPTE) – %
Figure 10.SMPTE IM vs. Amplitude
V rms
FREQUENCY – kHz
AMPLITUDE – dBu
9b. THD vs. Frequency (FFT)
FREQUENCY – kHz
AMPLITUDE – dBu
Figure 11.Noise Floor FFT
SUPPLY VOLTAGE – Volts±13±6±7±8±9±10±11±12±5
SUPPLY CURRENT – mA
Figure 13.ISY vs. VS
Figure 9c. THD vs. Frequency (FFT)
Figure 12.PSR vs. Frequency
SSM2160/SSM2161
APPLICATIONS INFORMATION
General
The SSM2160 and SSM2161 are six and four channel volume
controls intended for multichannel audio applications. While
dual channel controls sufficed for “stereo” applications, the
rapidly emerging home theater “surround sound” and auto
sound venues demand both six and four channel high perfor-
mance controls. The following information applies equally to
the SSM2160 and SSM2161, except where noted. Line level
signals are fed to the six high impedance inputs. The system
microcontroller sets the gain of the six channels via a three or
four 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 17 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 six 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 ±5V to10V and from single supplies from +10V to +20V. The
SSM2161 can be operated from dual supplies from ±4.25 V to10 V for automotive applications and from single supplies from
+8.5 V to +20 V. In order 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 both devices. An on-chip buffered voltage divider
provides the correct analog common voltage for single supply
applications.
Table I.Signal Levels vs. Power Supplies
SSM2160
SSM2161
Dual Power Supplies
As shown in Figure 14, 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 device 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.10µF
10µF
Figure 14.Dual Supply Configuration
Single Power Supply
When a single supply is used, it is necessary to connect AGND
(Pin 2) to VREF (Pin 3) as shown in Figure 15. 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 16 may be necessary to eliminate any
noise pickup.10µF
10µF
Figure 15.Single Supply Configuration

Partno	Mfg	Dc	Qty	Available	Descript
SSM2160S-REEL \|SSM2160SREEL	AD	N/a	10000	avai	6- and 4-Channel, Serial Input Master/Balance Volume Controls
SSM2160P	AD	N/a	109	avai	6- and 4-Channel, Serial Input Master/Balance Volume Controls
SSM2160S	AD	N/a	300	avai	6- and 4-Channel, Serial Input Master/Balance Volume Controls
SSM2161P	AD	N/a	38	avai	6- and 4-Channel, Serial Input Master/Balance Volume Controls