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LA72914V-TLM-H Datasheet(PDF) 7 Page - ON Semiconductor

Part No. LA72914V-TLM-H
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.A1859-7/9
Continued from preceding page.
Pin No.
Pin Name
Description
Equivalent circuit
12
AGC monitor
FM AGC monitor pin.
12
13
GND
GND pin.
14
VCO CTL
Modulation frequency fine control pin.
Adjustment frequency is, about
±220kHz at 0.5V to 4.5V
DC.
14
C1
VR1
2.4V
15
ALC CTL
Audio ALC filter pin.
Please connect 0.47
μF capacitor.
15
C1
16
TX Audio IN
(TX-OFF_CTL)
Audio signal input pin.
Internal bias is 2.4V DC. Please use capacitor coupling. If
DC voltage set to under 0.4V DC, then modulator circuit
stops. Demodulation circuit is work. This is receiving only
mode. (TX-OFF: 0 to 0.4V)
16
C1
2.4V
Signal processing outline
[Modulation block]
• Audio signal is input from pin16. (Internal bias is DC 2.4V.) Go through AMP (6dB)/ALC/LPF (10 kHz) and emphasis circuit,
then input FM-modulation block. After FM-modulation block, go to output driver block then FM-audio signal output from pin1.
• ALC: ALC circuit work at pin16 input level over than 0.5Vp-p.
• LPF: LPF gain is -3dB at 10 kHz and -6dB/oct. Keep over modulation from emphasis characteristic.
• Emphasis circuit: The pin3 owns an Emphasis characteristic which connected capacitor. Recommended value = 6800pF.
• FM modulation: Carrier frequency is choosing from pin6 voltage. When pin16 input level is 0.5Vp-p, then FM deviation set to ±25
kHz. Internal LPF reduce harmonic spectrum.
• Output Driver: Output AC voltage is about 2.0Vp-p. (Load resistance: 1kΩ)




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