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| 型号： | SSM2166SZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC PREAMP AUDIO MONO MIC 14SOIC |
| 产品变化通告： | Material Change 25/Mar/2009 |
| 标准包装： | 1 |
| 类型： | AB 类 |
| 输出类型： | 1-通道（单声道） |
| 电源电压： | 4.5 V ~ 5.5 V |
| 特点： | 麦克风 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 14-SOICN |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 775 (CN2011-ZH PDF) |
| 其它名称： | SSM2166SZ-REELDKR |
Data Sheet
SSM2166
Rev. E | Page 11 of 20
Because limiting occurs for signals larger than the rotation point
(VIN > VRP), the rotation point effectively sets the maximum output
signal level. It is recommended that the rotation point be set at
the upper extreme of the range of typical input signals so that
the compression region covers the entire desired input signal
range. Occasional larger signal transients are then attenuated by
the action of the limiter.
VCA
GAIN
VCA
GAIN
VCA
GAIN
OU
TP
U
T
(
dB
)
INPUT (dB)
VRP1
r:1
1
00357-
020
VDE
VRP2 VRP3
Figure 21. Effect of Varying the Rotation Point
VCA Gain Setting and Muting
The maximum gain of the SSM2166 is set by the GAIN ADJUST
pin (Pin 2) via RGAIN. This resistor, with a range of 1 k to
20 k, causes the nominal VCA gain to vary from 0 dB to
approximately 20 dB, respectively. Setting the VCA gain to its
maximum can also be achieved by leaving the GAIN ADJUST
pin in an open condition (no connect). Figure 22 illustrates the
effect on the transfer characteristic by varying this parameter.
For low level signal sources, the VCA should be set to maximum
gain using a 20 k resistor.
VCA GAIN
OU
TP
U
T
(
dB
)
INPUT (dB)
VRP
r:1
1
00357-
021
VDE
Figure 22. Effect of Varying the VCA Gain Setting
The gain of the VCA can be reduced below 0 dB by making
RGAIN smaller than 1 k. Switching Pin 2 through 330 or less
to GND mutes the output. Either a switch connected to ground or a
transistor can be used, as shown in Figure 23. To avoid audible
clicks when using the mute feature, a capacitor (C5) can be
connected from Pin 2 to GND. The value of the capacitor is
arbitrary and should be determined empirically, but a 0.01 F
capacitor is a good starting value.
00357-
022
RGAIN
C5
330
2
GAIN ADJUST
SSM2166
NOTES
1. ADDITIONAL CIRCUIT DETAILS OMITTED
MUTE
(CLOSED SWITCH)
FOR CLARITY.
Figure 23. Details of Mute Option
Downward Expansion Threshold
The downward expansion threshold, or noise gate, is deter-
mined via a second reference voltage internal to the control
circuitry. This second reference can be varied in the SSM2166
using a resistor, RGATE, connected between the positive supply
and the NOISE GATE SET pin (Pin 9). The effect of varying this
threshold is shown in Figure 24. The downward expansion
threshold can be set between 300 V rms and 20 mV rms by
varying the resistance value between Pin 9 and the supply
voltage. Like the ROTATION SET pin, the downward expansion
threshold is inversely proportional to the value of this resistance:
setting this resistance to 1 M sets the threshold at approximately
250 V rms, whereas a 10 k resistance sets the threshold at
approximately 20 mV rms. This relationship is illustrated in
Figure 5. A potentiometer network is provided on the evaluation
board for this adjustment. In general, the downward expansion
threshold should be set at the lower extreme of the desired range of
the input signals so that signals below this level are attenuated.
OU
TP
U
T
(
dB
)
INPUT (dB)
1
VRP
VDE1
r:1
VCA GAIN
00357-
023
VDE3
VDE2
Figure 24. Effect of Varying the Downward Expansion (Noise Gate) Threshold
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SSM2166SZ-REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Microphone Preamplifier with Variable Compression and Noise Gating |
| SSM2166SZ-REEL7 | 功能描述:IC PREAMP AUDIO MONO MIC 14SOIC RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:- 标准包装:80 系列:- 类型:AB 类 输出类型:1-通道（单声道） 在某负载时最大输出功率 x 通道数量:1.25W x 1 @ 8 欧姆 电源电压:2.5 V ~ 5.5 V 特点:消除爆音，差分输入，关闭，热保护 安装类型:表面贴装 供应商设备封装:8-MSOP-PowerPad 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:管件 配用:296-31419-ND - EVAL MODULE FOR TPA6205A1 其它名称:296-34563-5TPA6205A1DGN-ND |
| SSM2166SZ-REEL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:Microphone Preamplifier with Variable Compression and Noise Gating |
| SSM2166SZ-X | 制造商:Analog Devices 功能描述:MICROPHONE PREAMPLIFIER W/VAR COMPRESS, ROHS - Rail/Tube |
| SSM2167 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Voltage Microphone Preamplifier with Variable Compression and Noise Gating |
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