xr215a Exar Corporation, xr215a Datasheet - Page 26

• Manufacturer Part Number: xr215a
• Description: Monolithic Phase-locked Loop
• Manufacturer: Exar Corporation

Tracking Filter/Discriminator
The wide tracking range of the XR-215A allows the
system to track an input signal over a 3:1 frequency
range, centered about the VCO free running frequency.
The tracking range is maximum when the binary range-
select (pin 10) is open circuited. The circuit connections
for this application are shown in Figure 25. Typical
tracking range for a given input signal amplitude is shown
XR-215A
Rev. 1.01
Signal
Input
Vs
0.1 F
Figure 25. Circuit Connection For Tracking Filter Applications
Ro
11
12
10
6
V
9
U1
EE
13
C
Phase
Comp.
0.1 F
2K
VCO
0
14
5K
5
2
C
50
1
26
5K
3
16 V
in
components are:
1k < R
capacitor C
requirements (see Figure 8. )
+12V
C
50
1
XR-215A
1
R
Op
Amp.
P
Figure 26. Recommended values of external
CC
20K
2K
7
0.1 F
300pF
15
0
4
< 4k and 30 C
8
0
is determined by the center frequency
R
F
2K
10K
0
10K
< C
Cc
1
< 300 C
Output
VCO
Discriminator
Output
0
where the timing