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SSM2166P

更新时间： 2024-01-24 20:19:36
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：compliantECCN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-G14JESD-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 mmBase Number Matches：1

SSM2166P 数据手册

 浏览型号SSM2166P的Datasheet PDF文件第5页浏览型号SSM2166P的Datasheet PDF文件第6页浏览型号SSM2166P的Datasheet PDF文件第7页浏览型号SSM2166P的Datasheet PDF文件第9页浏览型号SSM2166P的Datasheet PDF文件第10页浏览型号SSM2166P的Datasheet PDF文件第11页 
SSM2166  
the rotation point may be varied from approximately 20 mV rms  
to 1 V rms. From the figure, the rotation point is inversely propor-  
tional to RROT PT. For example, a 1 kΩ resistor would typically  
set the rotation point at 1 V rms, whereas a 55 kΩ resistor would  
typically set the rotation point at approximately 30 mV rms.  
1S  
100mV  
100  
90  
6dBV  
Since 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 will cover the entire desired in-  
put signal range. Occasional larger signal transients will then be  
attenuated by the action of the limiter.  
66dBV  
85dBV  
10  
0%  
Figure 15b. RMS Level Detector Performance with  
CAVG = 22 µF  
Control Circuitry  
The output of the rms level detector is a signal proportional to  
the log of the true rms value of the buffer output with an added  
dc offset. The control circuitry subtracts a dc voltage from this  
signal, scales it, and sends the result to the VCA to control the  
gain. The VCA’s gain control is logarithmic—a linear change in  
control signal causes a dB change in gain. It is this control law  
that allows linear processing of the log rms signal to provide the  
flat compression characteristic on the input/output characteristic  
shown in Figure 13.  
r:1  
VCA GAIN  
1
Compression Ratio. Changing the scaling of the control sig-  
nal fed to the VCA causes a change in the circuit’s compression  
ratio, “r.” This effect is shown in Figure 16. The compression  
ratio can be set by connecting a resistor between the COMP  
RATIO pin (Pin 10) and GND. Lowering RCOMP gives smaller  
compression ratios as indicated in Figure 5, with values of about  
17 kΩ or less resulting in a compression ratio of 1:1. AGC per-  
formance is achieved with compression ratios between 2:1 and  
15:1, and is dependent on the application. A 100 kΩ potentiom-  
eter may be used to allow this parameter to be adjusted. On the  
evaluation board (Figure 22), an optional resistor can be used to  
set the compression equal to 1:1 when the wiper of the potenti-  
ometer is at its full CCW position.  
1
V
V
V
V
DE  
RP1  
RP2 RP3  
INPUT – dB  
Figure 17. 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 between 1 kΩ and 20 kΩ, will cause  
the nominal VCA gain to vary from 0 dB to approximately  
20 dB, respectively. To set the VCA gain to its maximum can  
also be achieved by leaving the GAIN ADJUST pin in an  
OPEN condition (no connect). Figure 18 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 kΩ resistor.  
.
15:1  
5:1  
VCA GAIN  
2:1  
1:1  
r:1  
VCA GAIN  
1
1
V
V
RP  
DE  
1
INPUT – dB  
1
Figure 16. Effect of Varying the Compression Ratio  
V
V
RP  
DE  
INPUT – dB  
Rotation Point. An internal dc reference voltage in the control  
circuitry, used to set the rotation point, is user-specified, as il-  
lustrated in Figure 9. The effect on rotation point is shown in  
Figure 17. By varying a resistor, RROT PT, connected between the  
positive supply and the ROTATION POINT SET pin (Pin 11),  
Figure 18. Effect of Varying the VCA Gain Setting  
–8–  
REV. A  
1...567891011...15

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