參數(shù)資料
型號(hào): XR-2211ACD
廠商: EXAR CORP
元件分類: 通信及網(wǎng)絡(luò)
英文描述: IC,FLASH EPROM 512KX8 3.3 PLCC
中文描述: SPECIALTY TELECOM CIRCUIT, PDSO14
封裝: 0.150 INCH, SOIC-14
文件頁(yè)數(shù): 17/24頁(yè)
文件大?。?/td> 246K
代理商: XR-2211ACD
XR-2211A
17
Rev. 1.01
c)
Calculate R
1
to set the bandwidth + f (See design equation 5):
R
1
R
0
·f
O
·2
f
20,000·1,000·2
100
400K
Note:
The total detection bandwidth covers the frequency range of f
O
+ f
d)
Calculate value of C
0
for a given loop damping factor:
Normally,
= 0.5 is recommended.
C
1
1250·C
0
R
1
·
2
1250·50·10
–9
400,000·0.5
2
6.25pF
Increasing C
1
improves the out-of-band signal rejection, but increases the PLL capture time.
e) Calculate value of the filter capacitor C
D
. To avoid chatter at the logic output, with R
D
= 470K , C
D
must be:
C
D
16
f
16
200
80nF
Increasing C
D
slows down the logic output response time.
Fine tune center frequency with 5K potentiometer, R
X
.
f)
0.1
μ
F
R
F
100K
V
CC
Loop
Phase
Detect
C
1
11
R
1
8
FSK
Comp
.
Internal
Reference
7
3
2
1
4
11
LM324
C
F
Output
Demodulated
6
LDOQ
0.1
μ
F
10
Lock
Detect
Comp.
VCO
14
13
12
R
0
C
0
2
0.1
μ
F
Input
FM
Quad
Phase
Detect
5
LDOQN
Figure 13. Linear FM Detector Using XR-2211A and an External Op Amp.
(See Section on Design Equation for Component Values.)
V
CC
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