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參數(shù)資料
| 型號： | SA575NG |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC COMPANDOR 2CHAN GAIN 20-DIP |
| 標(biāo)準(zhǔn)包裝： | 18 |
| 類型： | 壓縮擴(kuò)展器 |
| 應(yīng)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(yīng)商設(shè)備封裝： | 20-PDIP |
| 包裝： | 管件 |
SA575
http://onsemi.com
5
Expandor
The typical expandor configuration is shown in Figure 2.
The variable gain cell and the rectifier cell are in the signal
input path. The VREF is always 1/2 VCC to provide the
maximum headroom without clipping. The 0 dB ref is
100 mVRMS. The input is AC coupled through C5, and the
output is AC coupled through C3. If in a system the inputs
and outputs are AC coupled, then C3 and C5 can be
eliminated, thus requiring only one external component,
C4. The variable gain cell and rectifier cell are DC coupled
so any offset voltage between Pins 4 and 9 will cause small
offset error current in the rectifier cell. This will affect the
accuracy of the gain cell. This can be improved by using an
extra capacitor from the input to Pin 4 and eliminating the
DC connection between Pins 4 and 9.
The expandor gain expression and the attack and release
respectively.
(eq. 1)
4VIN(avg)
3.8 k
W x 100 mA
Expandor gain =
where VIN(avg) = 0.95VIN(RMS)
2
(eq. 2)
tR = tA = 10 kW x CRECT = 10 kW x C4
2.2
mF
10
mF
10
mF
VREF
DG
S
EXP IN
EXP OUT
9, 11
4, 16
5, 15
7, 13
6, 14
8
Figure 2. Typical Expandor Configuration
10k
W
3.8k
W
10k
W
C5
C4
C3
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