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LA72914V Datasheet(PDF) 8 Page - ON Semiconductor

Part No. LA72914V
Description  FM Modulator and Demodulator IC
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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LA72914V
No.A1859-8/9
[De-modulation block]
• Demodulate audio signal from modulated audio signal.
• FM-Audio signal is input from pin5. Go through 4.5M-Trap-filter or 6.5MHz-Trap-filter and AGC go to demodulator. After
demodulator go to De-emphasis circuit. After de-emphasis circuit signal is output pin7. Pin7 signal is charge to DC bias for
coupling capacitor at pin8. Audio signal from pin8 go to 6dB AMP then output from pin9. (Door-phone application, there are two
FM carrier. In this case we recommend add BPF before pin5 FM-Audio signal input.)
• 4.5M/6.5MHz-Trap-filter: Internal Trap-filter is change for pin6 mode control. (If modulator frequency is 4.5MHz, then internal
Trap-filter is 4.5MHz.)
• AGC: After AGC level is control about 0.3Vp-p. After AGC signal go to pin12 FM-monitor and de-modulator.
• De-emphasis circuit: The pin7 owns an De-emphasis characteristic which connected capacitor. Recommended value = 10nF.
• Output signal level: If input FM signal deviation is ±25 kHz, then output signal level is 1Vp-p (TYP) from pin9/ (Load resistance:
10k
Ω at 1 kHz.)
Characteristics
Frequency responce TxIn-RxOut
-15
-9
-6
-3
-12
3
0.01
0.1
10
1
100
0
400
800
200
600
10
100
1000
1500
1000
500
400
500
300
200
ALC characteristics
0
2000
0
100
600
1200
FMAGC characteristics
1
10000
2500
Input level, [mVp-p]
1000
Pin 16
6dB
Pin 9
ALC
Input level, [mVp-p]
fo=4.5MHz
(unmodulated signals)
Pin 12
Frequency, [kHz]
0




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