lc72131m Sanyo Semiconductor Corporation, lc72131m Datasheet - Page 16

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lc72131m

Manufacturer Part Number
lc72131m
Description
Am/fm Pll Frequency Synthesizer
Manufacturer
Sanyo Semiconductor Corporation
Datasheet

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IF Counter Structure
The LC72131 IF counter is a 20-bit binary counter. The result, i.e., the counter’s msb, can be read serially from the DO pin.
The IF frequency (Fc) is measured by determining how many pulses were input to an IF counter in a specified
measurement period, GT.
Fc =
1. IF Counter Frequency Calculation Examples
GT1
0
0
1
1
• When the measurement period (GT) is 32 ms, the count (C) is 53980 hexadecimal (342400 decimal):
• When the measurement period (GT) is 8 ms, the count (C) is E10 hexadecimal (3600 decimal):
GT
IF frequency (Fc) = 342400 32 ms = 10.7 MHz
IF frequency (Fc) = 3600 8 ms = 450 kHz
C
GT0
0
1
0
1
Measurement period (GT) (ms)
(C = Fc GT)
32
64
4
8
Measurement time
Wait time (twu) (ms)
C: Count value (number of pulses)
LC72131, 72131M
3 to 4
3 to 4
7 to 8
7 to 8
No. 4921-16/23

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