SSM2166P

更新时间： 2024-02-25 12:59:33

品牌	Logo	应用领域
亚德诺 - ADI		消费电路商用集成电路音频放大器视频放大器光电二极管
页数	文件大小	规格书
15页	218K
描述
Microphone Preamplifier with Variable Compression and Noise Gating

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SSM2166P 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP, SOP14,.25	针数：	14
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.31.00.01	风险等级：	0.83
Is Samacsys：	N	标称带宽：	20 kHz
商用集成电路类型：	AUDIO PREAMPLIFIER	增益：	20 dB
JESD-30 代码：	R-PDSO-G14	JESD-609代码：	e3
长度：	8.65 mm	湿度敏感等级：	1
信道数量：	1	功能数量：	1
端子数量：	14	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP14,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	电源：	5 V
认证状态：	Not Qualified	座面最大高度：	1.75 mm
子类别：	Audio/Video Amplifiers	最大压摆率：	10 mA
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
表面贴装：	YES	技术：	BIPOLAR
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	3.9 mm	Base Number Matches：	1

SSM2166P 数据手册

SSM2166

STEP 9. Record Values

STEP 5. Adjusting the Rotation Point

With the power removed from the test fixture, measure and

record the values of all potentiometers, including any fixed resis-

tance in series with them. If you have changed the averaging

capacitor, C4, note its value too.

Set the input level to 15 mV, and observe the output on the os-

cilloscope. Adjust R3—ROTATION PT ADJ CW until the

output level just begins to drop, then reverse so that the output is

500 mV. You have now set the limiting to 500 mV.

STEP 6. Adjusting the Compression Ratio

SUMMARY

Set the input signal for an output of 500 mV but not in limiting.

Note the value (around 15 mV). Next, reduce the input to 1/10

the value noted, (around 1.5 mV), for a change of –20 dB. Next,

adjust R6—COMP RATIO CW until the output is 160 mV, for

an output change of –10 dB. You have now set the compression,

which is the ratio of output change to input change, in dB, to 2:1.

We have implemented the transfer condition of Figure 2. For

inputs below the 100 µV noise gate threshold, circuit and back-

ground noise will be minimized. Above it, the output will in-

crease at a rate of 1 dB for each 2 dB input increase, until the

500 mV rotation point is reached at an input of approximately

15 mV. For higher inputs that would drive the output beyond

500 mV, limiting will occur, and there will be little further in-

crease. The SSM2166 processes the output of the buffer, which

in our example is 20 dB or ten times the input level. Use the os-

cilloscope to ensure that you are not driving the buffer into clip-

ping with the highest expected input peaks. Always take the

minimum gain in the buffer consistent with the average source

level and crest factor (ratio of peak to rms). The wide program

range of the SSM2166 makes it useful in many applications

other than microphone signal conditioning.

STEP 7. Setting the Noise Gate

With the input set at 100 µV, observe the output on the oscillo-

scope, and adjust R7—ROT PT SET CCW until the output

drops rapidly. “Rock” the control back and forth to find the

“knee.” You have set the noise gate to 100 µV. The range of

the noise gate is from 0.3 mV to over 0.5 mV relative to the out-

put of the buffer. To fit this range to your application, you may

have to attenuate the input or apportion the buffer gain and VCA

gain differently.

STEP 8. Listening

Other Versions

At this time, you may want to connect an electret microphone to

the SSM2166, and listen to the results. Be sure to include the

proper power for the microphone’s internal FET (usually +2 V

to +5 V dc through a 2.2 kΩ resistor). Experiment with the

settings to hear how the results change. Varying the averaging

capacitor, C4, changes the attack and decay times, which are

best determined empirically. Compression ratio will keep the

output steady over a range of microphone to speaker distance,

and the noise gate will keep the background sounds subdued.

The SSM2165 is an 8-lead version of this microphone preamp

with unity buffer gain and preset noise gate threshold. Custom-

ized parts are available for large volume users. For further in-

formation, contact your sales representative.

REV. A

–13–

1...10 11 121314 15

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与SSM2166P相关器件

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SSM2166S	ADI	Microphone Preamplifier with Variable Compression and Noise Gating	获取价格
SSM2166S-REEL	ADI	Microphone Preamplifier with Variable Compression and Noise Gating	获取价格
SSM2166S-REEL7	ADI	Microphone Preamplifier with Variable Compression and Noise Gating	获取价格
SSM2166SZ	ADI	Complete Microphone Conditioner with Variable Compression & Noise Gating	获取价格
SSM2166SZ1	ADI	Microphone Preamplifier with Variable Compression and Noise Gating	获取价格
SSM2166SZ-REEL	ADI	Complete Microphone Conditioner with Variable Compression & Noise Gating	获取价格

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