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LA72912V Datasheet(PDF) 10 Page - Sanyo Semicon Device

Part No. LA72912V
Description  FM Modulator and Demodulator IC
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Maker  SANYO [Sanyo Semicon Device]
Homepage  http://www.ssdc-jp.com/eng/
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LA72912V
No.A1409-10/12
Continued from preceding page.
Pin No.
Pin Name
Description
Equivalent circuit
15
ASK AGC filter
/AGC OFF
AGC filter pin for ASK.
Please connect pull-up resistance to this pin, and do
more than 4.5V at voltage of this pin.
15
10k
500
60
µA
C1
100k
10k
AGC-DET
16
ASK RX input
ASK input pin.
Please connect with capacitor, 3.3V by internal biased.
16
300
80
µA
C1
66k
34k
200
ASK signal
17
Standby control
Standby control pin.
FM block standby: under 0.4V DC voltage. (0 to 0.4V)
FM block operate: over 2V DC voltage. (2 to 5V)
17
1k
30
µA
18
DOC-OUT
/2nd-Call input
DEMOD mode: Drop-out output pin.
This pin is open collector output, so please connect pull
up resistor.
MOD mode: 2ND-CALL input.
2ND-CALL input: under 0.4V DC voltage. (0 to 0.4V)
Normal: over 2V DC voltage. (2 to 5V)
18
1k
30
µA
300
19
B-GND
Circuit GND.
20
FM AGC filter
MOD mode: Emphasis monitor pin.
DEMOD mode: FM AGC filter pin.
If FM AGC no need ( = AGC Off),
Please set pin 12 voltage over 4.5V DC voltage. (4.5 to
5V)
20
10k
500
60
µA
C1
100k
AGC-DET
EMP
21
De-emphasis filter
DEMOD mode: De-emphasis filter pin.
De-emphasis time constant must be matching at
emphasis time constant.
(If you don’t need the emphasis, this pin is open.)
21
R1
C1
300
µA
SIG
22
A-GND
Circuit GND.
Continued on next page.




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