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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 246K |
| 代理商： | XR-2211ACD |
XR-2211A
10
Rev. 1.01
APPLICATIONS INFORMATION
FSK Decoding
Figure 10. shows the basic circuit connection for FSK decoding. With reference to Figure 3. and Figure 10. the
functions of external components are defined as follows: R
0
and C
0
set the PLL center frequency, R
1
sets the system
bandwidth, and C
1
sets the loop filter time constant and the loop damping factor. C
F
and R
F
form a one-pole
post-detection filter for the FSK data output. The resistor R
B
from pin 7 to pin 8 introduces positive feedback across the
FSK comparator to facilitate rapid transition between output logic states.
Design Instructions:
The circuit of Figure 10.can be tailored for any FSK decoding application by the choice of five key circuit components:
R
0
, R
1
, C
0
, C
1
and C
F
. For a given set of FSK mark and space frequencies, f
O
and f
1
, these parameters can be calculated
as follows:
(All resistance in ’s, all frequency in Hz and all capacitance in farads, unless otherwise specified)
a)
Calculate PLL center frequency, f
O
:
f
O
F
1
·F
2
b)
Choose value of timing resistor R
0
, to be in the range of 10K to 100K . This choice is arbitrary. The recommended
value is R
0
= 20K . The final value of R
0
is normally fine-tuned with the series potentiometer, R
X
.
R
O
R
O
R
X
2
c)
Calculate value of C0 from design equation (1) or from Figure 7.
C
O
1
R
0
· f
0
d) Calculate R1 to give the desired tracking bandwidth (See design equation 5).
R
1
R
0
·f
0
(f
1
–f
2
)·2
e)
Calculate C1 to set loop damping. (See design equation 4):
Normally, = 0.5 is recommended.
C
1
1250·C
0
R
1
·
2
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| XR2211ACD-F | 功能描述:VCO振蕩器 4.5V-20V 5mA temp 0C to 70C RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負(fù)載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
| XR2211ACDTR-F | 功能描述:VCO振蕩器 RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負(fù)載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
| XR2211ACP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-FSK DEMODULATOR |
| XR-2211ACP | 制造商:EXAR 制造商全稱:EXAR 功能描述:FSK Demodulator/ Tone Decoder |
| XR2211ACP-F | 功能描述:VCO振蕩器 4.5V-20V 5mA temp 0C to 70C RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負(fù)載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
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