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參數(shù)資料
| 型號： | SSM2135SZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO STER CLASS AB 8SOIC |
| 標準包裝： | 1,000 |
| 放大器類型： | 音頻 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 0.9 V/µs |
| 增益帶寬積： | 3.5MHz |
| 電流 - 輸入偏壓： | 300nA |
| 電壓 - 輸入偏移： | 200µV |
| 電流 - 電源： | 3.7mA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (TR) |
SSM2135
Rev. G | Page 13 of 16
Digital Volume Control Circuit
Logarithmic Volume Control Circuit
Working in conjunction with the AD7528 dual 8-bit DAC,
the SSM2135 makes an efficient audio attenuator, as shown in
Figure 38. The circuit works off a single 5 V supply. The DACs
are biased to a 2 V reference level, which is sufficient to keep
the internal R-2R ladder switches of the DACs operating prop-
erly. This voltage is also the optimal midpoint of the SSM2135
common-mode and output swing range. With the circuit as
shown in Figure 38, the maximum input and output swing is
1.25 V rms. Total harmonic distortion measures a respectable
0.01% at 1 kHz and 0.1% at 20 kHz. The frequency response at
any attenuation level is flat to 20 kHz.
Figure 39 shows a logarithmic version of the volume control
function. Similar biasing is used. With an 8-bit bus, the AD7111
provides an 88.5 dB attenuation range. Each bit resolves a 0.375 dB
attenuation. Refer to the AD7111 data sheet for attenuation levels
for each input code.
IOUT
DATA IN
AND
CONTROL
LEFT AUDIO
IN
RIGHT AUDIO
IN
VDD
DGND
5V
0.1F
AGND
IOUT
RFB
VDD
DGND
VIN
AD7111
3
5V
0.1F
3
14
16
10
47F
RFB
AGND
VIN
D1
AD7111
5V
1/2
SSM2135
1/2
SSM2135
47F
2k
5V
2V
7.5k
5k
100
0.1F
1F
2V
1/2
SSM2135
5V
47F
1
2
1
2
RIGHT AUDIO
OUT
LEFT AUDIO
OUT
10F + 0.1F
00349-
0
41
Each DAC can be controlled independently via the 8-bit parallel
data bus. The attenuation level is linearly controlled by the
binary weighting of the digital data input. Total attenuation
ranges from 0 dB to 48 dB.
5V
1/2
SSM2135
1/2
SSM2135
5V 10F + 0.1F
6
DAC A/
DAC B
1/2
SSM2135
VREFA
DAC A
OUT A
RFBA
VREFB
DACB
RFBB
OUT B
DATA IN
15
CS
16
WR
18
CONTROL
SIGNAL
LEFT
AUDIO IN
RIGHT
AUDIO IN
VDD
DGND
17
5
5V
0.1F
AD7528
3
2
19
20
1
RIGHT AUDIO
OUT
OUT
47F
2k
5V
2V
7.5k
5k
100
0.1F
1F
2V
0
03
49-
04
0
Figure 39. Single-Supply Logarithmic Volume Control
Figure 38. Digital Volume Control
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SSM2139P | 制造商:Analog Devices 功能描述: |
| SSM2139S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| SSM2141 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Common-Mode Rejection Differential Line Receiver |
| SSM2141P | 制造商:Rochester Electronics LLC 功能描述:H CMR DIFFERENTIAL LIN - Bulk 制造商:Analog Devices 功能描述:IC LINE RECEIVER |
| SSM-2141P | 制造商:Analog Devices 功能描述: |
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