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參數(shù)資料
| 型號： | XR-215A |
| 廠商： | Exar Corporation |
| 英文描述： | Monolithic Phase Locked Loop |
| 中文描述： | 單片鎖相環(huán) |
| 文件頁數(shù)： | 27/32頁 |
| 文件大?。?/td> | 331K |
| 代理商： | XR-215A |
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XR-215A
27
Rev. 1.01
The phase-comparator output voltage is a linear measure of the VCO frequency deviation from its free-running value.
The amplifier section, therefore, can be used to provide a filtered and amplified version of the loop error voltage. In this
case, the DC output level at pin 15 can be adjusted to be directly proportional to the difference between the VCO
free-running frequency, fo, and the input signal, fs. The entire system can operate as a “l(fā)inear discriminator” or analog
“frequency-meter” over a 3:1 change of input frequency. The discriminator gain can be adjusted by proper choice of R
0
or R
F
, for the test circuit of Figure 25 the discriminator output is approximately (0.7 R
0
R
F
) mV per % of frequency
deviation where R
0
and R
F
are in k . Output non-linearity is typically less than 1% for frequency deviations up to +15%.
Figure 28shows the normalized output characteristics as a function of input frequency, with R
0
= 2k and R
F
= 36k .
Crystal-Controlled PLL
The XR-215A can be operated as a crystal-controlled phase-locked loop by replacing the timing capacitor with a crystal.
A circuit connection for this application is shown in Figure 28. Normally a small tuning capacitor (
series with the crystal to set the crystal frequency. For this application the crystal should be operated in its fundamental
mode. Typical pull-in range of the circuits is +1kHz at 10MHz. There is some distortion on the demodulated output.
30pF) is required in
0.5
1.0
Figure 26. Tracking Range vs. Input Amplitude
(Pin 10 Open Circuited)
Tracking Range
Normalized Temperature Range (f/f
o
)
2.0
1.0
10
100
1000
S
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XR-215 | Monolithic Phase Locked Loop |
| XR-2207 | Voltage-Controlled Oscillator |
| XR-2207CP | Voltage-Controlled Oscillator |
| XR-2207D | Voltage-Controlled Oscillator |
| XR-2207M | Voltage-Controlled Oscillator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR-215ACD | 制造商:EXAR 制造商全稱:EXAR 功能描述:Monolithic Phase Locked Loop |
| XR-215ACP | 制造商:EXAR 制造商全稱:EXAR 功能描述:Monolithic Phase Locked Loop |
| XR215CP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-PHASE LOCKED LOOP |
| XR-215CP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Phase-Locked Loop |
| XR-215D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Phase-Locked Loop |
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