参数资料
型号: SSM2160SZ
厂商: Analog Devices Inc
文件页数: 16/16页
文件大小: 0K
描述: IC BALANCE/VOL CTRL DGITL 24SOIC
产品变化通告: Product Discontinuance 27/Oct/2011
标准包装: 31
类型: 立体声音量控制
应用: 解码器,接收器,环绕系统
安装类型: 表面贴装
封装/外壳: 24-SOIC(0.295",7.50mm 宽)
供应商设备封装: 24-SOIC W
包装: 管件
产品目录页面: 775 (CN2011-ZH PDF)
REV. A
SSM2160
–9–
SELECTION
ADDRESS MODE
ADDRESS
DATA MODE
DATA
7-BIT MASTER DAC
5-BIT CHANNEL DAC 1
5-BIT CHANNEL DAC 2
5-BIT CHANNEL DAC 3
5-BIT CHANNEL DAC 4
5-BIT CHANNEL DAC 5
5-BIT CHANNEL DAC 6
NO DAC SELECTED
1
X
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
X
X = DON'T CARE
SHADED AREA IS DATA
0 = MUTE
1 = UNMUTE
MSB
LSB
XXXXX
Figure 7. Interface Characteristics, DAC Address/Data Decoding Truth Table
+
V+
0.1 F
10 F
0.1 F
10 F
3
1
2
12
13
DGND
V–
VREF
AGND
V+
SSM2160
CHn IN
REF
OUT
Figure 4. Single-Supply Operation with VREF Buffer
Signal Chain Considerations
The SSM2160 is capable of providing an extremely wide control
range, from –127 dB of attenuation (limited only by the noise
floor) to +31 dB of gain. 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.
Figure 5 shows a typical application where the SSM2160 has been
placed between a surround sound decoder and the power
amplification stages. This allows the user to adjust both volume
and balance between six speakers through the use of the master
and channel controls.
FM/AM TUNER
PHONO PREAMP
CASSETTE DECK
COMPACT DISK
LASER DISK
VCR
MICROPHONE
MUX
SURROUND
SOUND
DECODER
SSM2160
TO
SPEAKERS
POWER AMPS
VOLUME AND
BALANCE
CONTROLS
LINE LEVEL INPUTS – STEREO PAIRS
Figure 5. Typical Signal Chain Using the SSM2160
Digital Control Range Plan
The SSM2160 may be modeled as six ganged potentiometers
followed by individual programmable gain channel amplifiers, as
shown in Figure 6. In actuality, each channel’s signal level is set by
a VCA that can give gain or attenuation, depending upon the control
voltage supplied. The input potentiometers have a maximum
gain 0 dB (unity), a minimum gain of –127 dB, and change in
1dB steps. The channel amplifiers each have minimum gain of
0 dB and a maximum gain of 31 dB and also change in 1 dB steps.
The data settings for the attenuation of the master potentiometer
and the channel amplifier are shown in Table II.
OUTPUT
CHANNEL
INPUT
0dB
–127dB
+31dB 0dB
MASTER
Figure 6. Potentiometer Representation of SSM2160
(One Channel Only)
Table II. Master and Channel Control
Data
dB
Hex
Binary
Master
Min Atten
0
7F
1111111
Max Atten
–127
00
0000000
Channel
Max Gain
+31
00
00000
Midgain
+15
10
10000
Min Gain
0
1F
11111
When using channel controls as balance controls, the center would
be with Channel = 10h (or 0Fh if desired). Increasing the gain
to the maximum would occur at Channel = 00h. Reducing the
gain to minimum would occur at Channel = 1Fh.
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