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參數(shù)資料
| 型號： | SSM2135SZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP AUDIO STER CLASS AB 8SOIC |
| 標(biāo)準(zhǔn)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 11 of 16
Low Noise Microphone Preamplifier
The 5.2 nV/√Hz input noise in conjunction with low distortion
make the SSM2315 an ideal device for amplifying low level signals
such as those produced by microphones. Figure 34 illustrates a
stereo microphone input circuit feeding a multimedia sound
codec. The gain is set at 100 (40 dB), although it can be set to
other gains depending on the microphone output levels. Figure 33
shows the harmonic distortion performance of the preamplifier
with 1 V rms output, while operating from a single 5 V supply.
codec. The same voltage is buffered by the 2N4124 transistor to
provide phantom power to the microphone. A typical electrets
condenser microphone with an impedance range of 100 Ω to
1 kΩ works well with the circuit. This power booster circuit can
be omitted for dynamic microphone elements.
1
0.01
0.1
10
20k
10k
1k
100
T
HD
+
N
(
%
)
FREQUENCY (Hz)
VS = 5V
AV = 40dB
VOUT = 1V rms
80kHz LOW-PASS FILTER
00
34
9-
03
4
Figure 33. MIC Preamp THD + N Performance
LEFT CHANNEL
MIC IN
RIGHT CHANNEL
MIC IN
2k
5V
10F
10k
2N4124
L_MIC
VCC
GNDA
VREF
AD1845
R_MIC
2k
10F
10k
10F
0.1F
100
10k
100
10k
0.1F
10F
5V
2
3
4
1
8
5
6
7
5V
29
35/36
34/37
32
28
1/2
SSM2135
1/2
SSM2135
00
34
9-
0
33
Figure 34. Low Noise Microphone Preamp for Multimedia Sound Codec
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