SC72131 データシートの表示（PDF） - Silan Microelectronics
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コンポーネント説明
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SC72131 Datasheet PDF : 10 Pages
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SC72131
FM MODE
1
*
0
1
0
0
Note: * Don’t care.
Input pin
FMIN
AMIN
AMIN
Set divisor
272 to 65535
272 to 65535
4 to 4095
Actual divisor: N
Twice the set value
The set value
The set value
Input frequency range (MHz)
10 to 160
2 to 40
0.5 to 10
1.IF Counter Structure
The SC72131 IF counter section consists of input amp, a gate time control circuit and a 20bit binary counter.
The result, i.e., the counter’s msb, can be read serially from the Dout pin.
G1
G0
0
0
0
1
1
0
1
1
2. IF Counter Operation
Gate time (GT) (ms)
4
8
32
64
Wait time (ms)
3~4
3~4
7~8
7~8
Note: 1. IFIN input have built-in amp. Data are input by capacitor coupling.
2. Before starting the IF count, the IF counter must be reset in advance by setting CTE in the serial data to 0.
3. The IF count is started by changing the CTE bit in the serial data from 0 to 1. The serial data is latched
by the SC72131 when the CE pin is dropped from high to low.
4.The IF signal must be supplied to the IFIN pin in the period between the point the CE pin goes low and
the end of the wait time at the latest.
5. The value of the IF counter at the end of the Gate-Time must be read out during the period that CTE is
1. This is because the IF counter is reset when CTE is set to 0.
6. When operating the IF counter, the control microprocessor must first check the state of the IF-IC SD
(station detect) signal and only after determining that the SD signal is present turn on IF buffer output
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:2.0 2004.08.03
Page 6 of 11
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