參數資料
型號: SA575N
廠商: ON Semiconductor
文件頁數: 14/16頁
文件大小: 0K
描述: IC COMPANDOR 2CHAN GAIN 20-DIP
產品變化通告: Product Obsolescence 11/Feb/2009
標準包裝: 18
類型: 壓縮擴展器
應用: 蜂窩式無線電,混頻器
安裝類型: 通孔
封裝/外殼: 20-DIP(0.300",7.62mm)
供應商設備封裝: 20-PDIP
包裝: 管件
SA575
http://onsemi.com
7
Automatic Level Control
The
typical
Automatic
Level
Control
circuit
configuration is shown in Figure 4. It can be seen that it is
quite similar to the compressor schematic except that the
input to the rectifier cell is from the input path and not from
the feedback path. The input is AC coupled through C12
and C13 and the output is AC coupled through C8. Once
again, as in the previous cases, if the system input and
output signals are already AC coupled, then C12, C13 and
C8 could be eliminated. Concerning the compressor,
removing R6, R7 and C7 will cause motor-boating in
absence of signals. CCOMP is necessary to stabilize the
summing amplifier at higher input levels. This circuit
provides an input dynamic range greater than 60 dB with
the output within
"0.5 dB typical. The necessary design
expressions are given by Equation 5 and Equation 6,
respectively.
(eq. 5)
4VIN(avg)
3.8 k
W x 100 mA
ALC gain =
(eq. 6)
tR = tA = 10 kW x CRECT = 10 kW x C9
2.2
mF
10
mF
10
mF
VREF
S
DG
1
mF
4.7
mF
ALC IN
ALC OUT
8
12
13
16
15
11
14
C COMP
22pF
C7
Figure 4. Typical ALC Configuration
10k
W
3.8k
W
10k
W
30k
W
30k
W
C12
C13
R6
R7
C8
C9
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