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LA1838 Datasheet(PDF) 5 Page - Sanyo Semicon Device |
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LA1838 Datasheet(HTML) 5 Page - Sanyo Semicon Device |
5 / 9 page Continued from preceding page. No. 5888-5/9 LA1838 Pin No. Pin function Pin voltage Notes Equivalent circuit 1.3 V AM narrow band CF connection 10 Recommended narrow band CF: BFU450 C4N (Murata Mfg. Co., Ltd.) When the narrow band SD function is not used, bypass this circuit with a 50 Ω resistor and a 0.047 µF capacitor in series. 10 A10640 0 V FM S-meter output 11 RL = 8 kΩ 11 A10641 0 V (AM) AM S-meter output 12 The AM SD sensitivity is adjusted with an external resistor connected between this pin and ground 12 28 A10642 0 V AM/FM IF buffer output, Output control switch (mute switch) 13 V13 ≤ 0.5 V: Reception state 1.4 V ≤ V13 ≤ 2.2 V: IF buffer output on V13 ≥ 3.5 V: IF buffer output and muting on 13 A10643 VCC – 1.4 (FM) 0 V (AM) Phase comparator low-pass filter (AM/FM switching) 14 The device operates in AM mode when this pin is connected to ground through a resistor. Limit values for the resistor: 2.7 k Ω (When VCC = 7 V) 3.9 k Ω (8 V), 5.1 kΩ (9 V) 6.2 k Ω (10 V), 7.5 kΩ (11 V) 14 A10644 VCC – 1.0 Pilot detector low- pass filter (Forced mono) (VCO stop) 15 The device is forced to monaural when a current of over 50 µA flows from this pin. The VCO is stopped if this pin is connected to ground. The limit values for the resistor are the same as those for pin 14. 15 A10645 Vreg Vreg Post-amplifier inputs and outputs 16 17 18 19 Output impedance ro = 200 Ω Pin 16: Right output, pin 17: Left output Inverting input pins Pin 18: Right input, pin 19: Left input RNF = 33 kΩ 16 18 19 17 A10646 3.5 V 3.5 V MPS outputs 20 21 Output impedance ro = 3.3 kΩ Pin 20: Right deemphasis Pin 21: Left deemphasis 20 21 A10647 Continued on next page. |
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