參數(shù)資料
型號(hào): XR2211CP
廠商: Exar Corporation
文件頁(yè)數(shù): 13/24頁(yè)
文件大?。?/td> 242K
代理商: XR2211CP
XR-2211
13
Rev. 3.01
Design Example:
1200 Baud FSK demodulator with mark and space frequencies of 1200/2200.
Step 1: Calculate f
O
: from design instructions
(a) f
O
1200·2200 =1624
Step 2: Calculate R
0
: R
0
=10K with a potentiometer of 10K. (See design instructions (b))
(b) R
T
10
10
2
15K
Step 3: Calculate C
0
from design instructions
(c) C
O
1
15000·1624
39nF
Step 4: Calculate R
1
: from design instructions
(d) R
1
20000·1624·2
(2200–1200)
51,000
Step 5: Calculate C
1
: from design instructions
(e) C
1
1250·39nF
51000·0.5
2
3.9nF
Step 6: Calculate R
F
: R
F
should be at least five times R
1
, R
F
= 51,000
5 = 255 K
Step 7: Calculate R
B
: R
B
should be at least five times R
F
, R
B
= 255,000
5 = 1.2 M
Step 8: Calculate R
SUM :
R
SUM
(R
F
(R
F
R
1
)·R
B
R
1
R
B
)
240K
Step 9: Calculate C
F :
C
F
0.25
R
SUM
·Baud Rate
1nF
Note:
All values except R
0
can be rounded to nearest standard value.
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