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參數(shù)資料
| 型號： | SSM-2120 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dynamic Range Processors/Dual VCA |
| 中文描述： | 動態(tài)范圍處理器/雙殼抗原 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 371K |
| 代理商： | SSM-2120 |
SSM2120/SSM2122
REV. C
–11–
FADER AUTOMATION
The SSM2120 can be used in fader automation systems to serve
two channels. The inverting control port is connected through
an attenuator to the VCA control voltage source. The noninverting
control port is connected to a control circuit (such as Figure 6)
which senses the input signal level to the VCA. Above the
threshold voltage, which can be set quite low (for example
–60 dBV), the VCA operates at its programmed gain. Below
this threshold the VCA will downward expand at a rate deter-
mined by the +V
C
control port attenuator. By keeping the release
time constant in the 10 ms to 25 ms range, the modulation of
the VCA standing noise floor (–80 dB at unity-gain), can be
kept inaudibly low.
The SSM2300 8-channel multiplexed sample-and-hold IC
makes an excellent controller for VCAs in automation systems.
Figure 16 shows the basic connection for the SSM2122 operating
as a unity-gain VCA with its noninverting control ports grounded
and access to the inverting control ports. This is typical for fader
automation applications. Since this device is a pinout option of
the SSM2120, the VCAs will behave exactly as described
earlier in the VCA section.
The SSM2122 can also be used with two or more op amps to
implement complex voltage-controlled filter functions. Biquad
and state-variable two-pole filters offering low pass, bandpass
and high pass outputs can be realized. Higher order filters can
also be formed by connecting two or more such stages in series.
V–
2000pF
47
36k
36k
10pF
1/2
TL082
V+
10pF
0.1μF
+15V
200
SIG
OUT 2
SIG
OUT 1
–V
C2
–V
C1
SIG
IN 1
1/2
TL082
8
1
2
3
4
7
6
5
14
13
12
11
16
15
10
9
SSM2122
200
220k
200
220k
200
50k
*
150k
V+
36k
V–
V+
50k
*
2000pF
47
36k
SIG
IN 2
0.1μF
–15V
*
OPTIONAL CONTROL FEEDTHROUGH TRIM
Figure 16. SSM2122 Basic Connection (Control Ports at 0 V)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SSM-2122 | Dynamic Range Processors/Dual VCA |
| SSM2120 | Dynamic Range Processors/Dual VCA |
| SSM2122 | Dynamic Range Processors/Dual VCA |
| SSM-2134 | LOW NOISE AUDIO OPERATIONAL AMPLIFIER |
| SSM2134 | LOW NOISE AUDIO OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SSM2120P | 制造商:Analog Devices 功能描述:DUAL VOLT ATTENUATOR 2120 DIP22 |
| SSM2122 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dynamic Range Processors/Dual VCA |
| SSM-2122 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dynamic Range Processors/Dual VCA |
| SSM2122P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Amplifier. Other |
| SSM2125 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Dolby Pro-Logic Surround Matrix Decoder |
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