參數(shù)資料
型號(hào)： 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(yè)數(shù)： 6/32頁(yè)
文件大?。?/td> 331K
代理商： XR-215A
XR-215A
6
Rev. 1.01
6
Figure 2. Equivalent Schematic Diagram
1
16
2
3
5
4
11
14 13
15
12
7
8
9
10
SYSTEM DESCRIPTION
The XR-215A monolithic PLL system consists of a
balanced phase comparator, a highly stable voltage-
controlled oscillator (VCO) and a high speed operational
amplifier. The phase comparator outputs are internally
connected to the VCO inputs and to the noninverting input
of the operational amplifier. A self-contained PLL System
is formed by simply AC coupling the VCO output to either
of the phase comparator inputs and adding a low-pass
filter to the phase comparator output terminals.
The VCO section has frequency sweep, on-off keying,
sync, and digital programming capabilities. Its frequency
is highly stable and is determined by a single external
capacitor. The operational amplifier can be used for audio
preamplification in FM detector applications or as a high
speed sense amplifier (or comparator) in FSK
demodulation.
DESCRIPTION OF CIRCUIT CONTROLS
Phase Comparator Inputs (Pins 4 and 6)
One input to the phase comparator is used as the signal
input. The remaining input should be AC coupled to the
VCO output (pin 15) to complete the PLL (see Figure 3).
For split supply operation, these inputs are biased from
ground as shown in Figure 4. For single supply operation,
a resistive bias string similar to that shown in Figure 3
should be used to set the bias level at approximately
V
CC
/2. The DC bias current at these terminals is
nominally 8 A.
Phase Comparator Bias (Pin 5)
This terminal should be DC biased as shown in Figure 3
and Figure 4 and AC grounded with a bypass capacitor.
Phase Comparator Outputs (Pins 2 and 3)
The low frequency (or DC) voltage across these pins
corresponds to the phase difference between the two
signals at the phase comparator inputs (pins 4 and 6). The
phase comparator outputs are internally connected to the
VCO control terminals (see Figure 2.) One of the outputs
(pin 3) is internally connected to the noninverting input of
the operational amplifier. The low-pass filter is achieved
by connecting an RC network to the phase comparator
outputs as shown in Figure 15.
相關(guān)PDF資料
PDF描述
XR-215 Monolithic Phase Locked Loop
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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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