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LA1836 Datasheet(PDF) 6 Page - Sanyo Semicon Device |
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LA1836 Datasheet(HTML) 6 Page - Sanyo Semicon Device |
6 / 13 page Continued from preceding page. No. 4787-6/13 LA1836, 1836M Pin No. Function Voltage Internal equivalent circuit Remarks 12 13 14 15 16 17 18 19 20 21 22 S-meter output, AM SD sensitivity adjustment AM narrow band CF connection Phase comparator low- pass filter (FM/AM switch) Pilot detector low-pass filter (forced mono) (VCO stop) Post-amplifier L output and R output Post-amplifier L input and R input MPX output, L output and R output MPX input 0.5 V (FM) 0 V (AM) 1.5 V VCC – 1.4 (FM) 0 V (AM) VCC – 1.0 VREG VREG VREG VREG 3.5 V 3.5 V 2.9 V The AM SD sensitivity can be adjusted with the resistor between this pin and ground. The AM SD sensitivity should be adjusted first, since the FM SD sensitivity is affected by this adjustment. Recommended narrow band CF: BFU450C4N (Murata) AM mode selected when this pin is connected to ground. The circuit is forced to mono when a current of 50 µA or larger flows from this pin. Connecting this pin to ground stops the VCO. Output impedance ro = 200 Ω Pin 16: left output Pin 17: right output Inverting inputs: ri = 3.3 kΩ Pin 18: left input Pin 19: right input Output impedance ro = 3.3 kΩ Pin 20: left de-emphasis Pin 21: right de-emphasis Input impedance ri = 20 kΩ The low-band separation characteristics are improved by increasing the value of the capacitor connected between this pin and pin 24. However, the impulse noise associated with AM/FM switching will increase. Continued on next page. |
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