MC145170-1 Motorola, MC145170-1 Datasheet - Page 17

• Manufacturer Part Number: MC145170-1
• Description: PLL FREQUENCY SYNTHESIZER WITH SERIAL INTERFACE
• Manufacturer: Motorola

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DataSheet
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NOTES:
MCU
1. The R and V outputs are fed to an external combiner/loop filter. See the Phase–Locked
2. For optimum performance, bypass the V DD pin to V SS (GND) with one or more low–induc-
3. The R counter is programmed for a divide value = OSC in /f R . Typically, f R is the tuning resolu-
4. May be an R–C low–pass filter.
V+
Loop — Low–Pass Filter Design page for additional information. The R and V outputs
swing rail–to–rail. Therefore, the user should be careful not to exceed the common mode
input range of the op amp used in the combiner/loop filter.
tance capacitors.
tion required for the VCO. Also, the VCO frequency divided by f R = N, where N is the divide
value of the N counter.
OPTIONAL
BUFFER
Figure 21. Example Application
VHF VCO
THRESHOLD
DETECTOR
OPTIONAL
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VHF OUTPUT
1
2
3
4
5
6
7
8
OSC in
OSC out
REF out
f in
D in
ENB
CLK
D out
LOW–PASS FILTER
INTEGRATOR
(NOTE 4)
PD out
V DD
V SS
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LD
f V
f R
V
R
16
15
14
13
12
11
10
9
V+
LOOP ERROR
OPTIONAL
SIGNALS
(NOTE 1)
MC145170–1
17