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SSM2165-2S-REEL7 PDF预览

SSM2165-2S-REEL7

更新时间： 2024-02-27 12:07:09
品牌 Logo 应用领域
亚德诺 - ADI 放大器光电二极管商用集成电路
页数 文件大小 规格书
10页 162K
描述
1 CHANNEL, AUDIO PREAMPLIFIER, PDSO8, SOIC-8

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SSM2165-2S-REEL7 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
零件包装代码：SOIC包装说明：SOIC-8
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.33.00.01
风险等级：5.87标称带宽：20 kHz
商用集成电路类型：AUDIO PREAMPLIFIER增益：8 dB
谐波失真：0.5%JESD-30 代码：R-PDSO-G8
JESD-609代码：e0长度：4.9 mm
湿度敏感等级：1信道数量：1
功能数量：1端子数量：8
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：SOP8,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE峰值回流温度（摄氏度）：240
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：Tin/Lead (Sn85Pb15)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

SSM2165-2S-REEL7 数据手册

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SSM2165  
20mV  
200mV  
100  
90  
100  
90  
T
= +25؇C  
A
T
= +25؇C  
A
C
R
= 2.2␮F  
AVG  
C
R
= 2.2␮F  
AVG  
= 10k⍀  
L
= 10k⍀  
L
COMP RATIO = 1:1  
COMP RATIO = 1:1  
10  
10  
V
V
= 12.5mV (–1)  
= 40mV (–2)  
0%  
IN  
IN  
V
V
= 125mV (–1)  
= 400mV (–2)  
0%  
IN  
IN  
10␮s  
10␮s  
Figure 8. Small Signal Transient Response  
Figure 9. Large Signal Transient Response  
APPLICATIONS INFORMATION  
THEORY OF OPERATION  
The SSM2165 is a complete microphone signal conditioning  
system in a single integrated circuit. Designed primarily for  
voiceband applications, this integrated circuit provides amplifi-  
cation, rms detection, limiting, variable compression, and down-  
ward expansion. The internal rms detector has a time constant  
set by an external capacitor. An integral voltage-controlled  
amplifier (VCA) provides up to 40 dB of gain in the signal path  
with approximately 30 kHz bandwidth. The device operates on  
a single +5 V supply, accepts input signals up to 1 V1, and pro-  
duces output signal levels at limiting of 320 mV and 250 mV for  
the SSM2165-1 and SSM2165-2 respectively, into loads > 5 kΩ.  
Figure 10 illustrates the general transfer characteristic for the  
SSM2165 where the output level in dBu is plotted as a function  
of the input level in dBu (0 dBu = 0.775 V rms). For input  
signals in the range of VDE (Downward Expansion) to VRP  
(Rotation Point) an “r” dB change in the input level causes a  
1 dB change in the output level. Here, “r” is defined as the  
“compression ratio.” The compression ratio may be varied  
from 1:1 (no compression) to over 15:1 via a single resistor,  
RCOMP. Input signals above VRP are compressed with a fixed  
compression ratio of approximately 10:1. This region of opera-  
tion is the “limiting region.” Varying the compression ratio has  
no effect on the limiting region. The breakpoint between the  
compression region and the limiting region is referred to as the  
“limiting threshold” or “rotation point,” and is different for the  
SSM2165-1 and SSM2165-2, see Table I.  
The SSM2165 contains an input buffer and automatic gain  
control (AGC) circuit for audio and voice band signals. Circuit  
operation is optimized by providing user-adjustable compression  
ratio and time constant. A downward expansion (noise gating)  
feature reduces background and circuit noise below 500 µV.  
The rotation point determines the output signal levels before  
limiting (referred to the input), and is 40 mV for the SSM2165-1  
and 100 mV for the SSM2165-2.  
Table I. Characteristics vs. Dash Number  
SSM2165 Rotation Point  
Gain  
18 dB 320 mV (–6 dBu)  
100 mV (–17.7 dBu) 8 dB 250 mV (–8 dBu)  
Output*  
–1  
–2  
40 mV (–25.7 dBu)  
LIMITING  
REGION  
LIMITING  
THRESHOLD  
*At limiting.  
(ROTATION POINT)  
The term “rotation point” derives from the observation that the  
straight line in the compression region “rotates” about this point  
on the input/output characteristic as the compression ratio is  
changed.  
COMPRESSION  
DOWNWARD  
EXPANSION  
REGION  
VCA GAIN  
THRESHOLD  
(NOISE GATE)  
r
1
When the compression is set to 2:1, a –2 dB change of the  
input signal level in the compression region causes –1 dB  
change of the output level. Likewise, at 10:1 compression, a  
–10 dB change of the input signal level in the compression  
region causes a –1 dB change in the output level. The gain of  
the system with an input signal level of VRP is fixed regardless of  
the compression ratio, and is different for the SSM2165-1 and  
SSM2165-2 (see Figures 1a and 1b). The “nominal gain” of  
the system is 18 dB for the SSM2165-1, and 8 dB for the  
SSM2165-2. System gain is measured at VRP and is (VOUT – VIN)  
in dB.  
DOWNWARD  
EXPANSION  
REGION  
1
1
V
V
rp  
DE  
INPUT – dB  
Figure 10. General Input/Output Characteristics of the  
SSM2165  
Input signals below VDE are downward expanded at a ratio of  
approximately 1:3. As a result, the gain of the system is small  
for very small input signal levels below VDE, even though it may  
be quite large for input signals above VDE. The downward  
expansion threshold, VDE, is fixed at 500 µV (–64 dBu) for both  
dash versions.  
1All signals are in rms volts or dBu (0 dBu = 0.775 V rms).  
REV. A  
–5–  
12345678...10

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