lc72136 Sanyo Semiconductor Corporation, lc72136 Datasheet - Page 16

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lc72136

Manufacturer Part Number
lc72136
Description
Frequency Synthesizer Electronic Tuning
Manufacturer
Sanyo Semiconductor Corporation
Datasheet

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IF Counter Structure
The LC72136 IF counter is a 20-bit binary counter. The result of the count can be read out serially, MSB first, from the
DO pin.
IF frequency (Fc) measurement consists of determining how many pulses enter the IF counter in a specified
measurement time (GT).
Sample IF Counter Frequency Calculations
1. For a measurement time (GT) of 32 ms and a count value (C) of 53980 (hexadecimal), which is 342,400 (decimal)
2. For a measurement time (GT) of 8 ms and a count value (C) of E10 (hexadecimal), which is 3600 (decimal)
GT1
0
0
1
1
Fc =
IF frequency (Fc) = 342,400 ÷ 32 ms = 10.7 MHz
IF frequency (Fc) = 3600 ÷ 8 ms = 450 kHz
GT
GT0
C
0
1
0
1
Measurement period (GT) (ms)
(C = Fc GT)
32
64
4
8
Measurement time
Wait time (t
C: count value (number of pulses)
LC72136, 72136M
3 to 4
3 to 4
7 to 8
7 to 8
WU
) (ms)
No. 5038-16/23

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