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參數(shù)資料
| 型號： | XR-215ACP |
| 廠商： | EXAR CORP |
| 元件分類： | XO, clock |
| 英文描述： | Monolithic Phase-Locked Loop |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 25 MHz, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 22/32頁 |
| 文件大?。?/td> | 331K |
| 代理商： | XR-215ACP |
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XR-215A
22
Rev. 1.01
Figure 20. Demodulated Output Waveforms for Time-Multiplexed Operation
Demodulated Output
Channel Select Pulse
FSK Demodulation
Figure 21contains a typical circuit connection for FSK
demodulation. When the input frequency is shifted,
corresponding to a data bit, the DC voltage at the phase
comparator outputs (pins 2 and 3) also reverses polarity.
The operational amplifier section is connected as a
comparator, and converts the DC level shift to a binary
output pulse. One of the phase comparator outputs (pin 3)
is AC grounded and serves as the bias reference for the
operational amplifier section. Capacitor C
1
serves as the
PLL loop filter, and C
2
and C
3
as post-detection filters.
Range select resistor, R
X
, can be used as a fine-tune
adjustment to set the VCO frequency.
Typical component values for 300 baud and 1200 baud
operation are listed below:
Operating
Conditions
Typical Component
Values
300 Baud
Low Band: f
1
= 1070Hz
f
2
= 1270Hz
High Band: f
1
= 2025Hz
f
2
= 2225Hz
R
0
= 5k , C
0
= 0.17 F
C
1
= C
2
= 0.047 F,
C
3
= 0.033 F
R
0
= 8k , C
0
= 0.1 F
C
1
= C
2
= C
3
= 0.033 F
R
0
= 2k , C
0
= 0.12 F
C
1
= C
3
= 0.003 F
C
2
=
0.01 F
1200 Baud
f
1
= 1200Hz
f
2
= 2200Hz
Table 1. Typical Component Values for Modems
Note:
For 300 Baud operation the circuit can be time-multiplexed be-
tween high and low bands by switching the external resistor R
X
in and out of the circuit with a control signal, as shown in
Figure 12.
FSK Generation
The digital programming capability of the XR-215A can be
used for FSK generation. A typical circuit connection for
this application is shown in Figure 22. The VCO
frequency can be shifted between the mark (f
2
) and space
(f
1
) frequencies by applying a logic pulse to pin 10. The
circuit can provide two separate FSK outputs: a low level
(2.5 Vp-p) output at pin 15 or a high amplitude (10 Vp-p)
output at pin 8. The output at each of these terminals is a
symmetrical squarewave with a typical second harmonic
content of less than 0.3%.
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