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LA1837 Folha de dados(PDF) 5 Page - Sanyo Semicon Device |
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LA1837 Folha de dados(HTML) 5 Page - Sanyo Semicon Device |
5 / 9 page Pin No. Pin Function Pin voltage (V) Pin description Equivalent circuit No. 5688-5/9 LA1837 AM narrow band CF connection 1.3 V Recommended narrow band CF: BFU450 C4N (Murata Mfg. Co., Ltd.) If the narrow band SD is not used, bypass this circuit with a 50- Ω resistor and a 0.047- µF capacitor connected in series. 10 FM S-meter output 0 V RL = 8 kΩ 11 AM S-meter output AM SD sensitivity adjustment 0 V (AM) The AM SD sensitivity is adjusted with the value of the external resistor connected between this pin and ground. 12 AM and FM IF buffer output, output control switch (mute switch) 0 V V13 ≤ 0.5 V: Reception state 1.4 V ≤ V13 ≤ 2.2 V: IF buffer output turned on V13 ≥ 3.5 V: IF buffer output and muting are turned on 13 Phase comparator low-pass filter (FM/AM switching) VCC – 1.4 (FM) 0 V (AM) Connecting this pin to ground through a resistor sets the IC to AM mode. Resistor value limits: 2.7 k Ω (when VCC = 7 V) 3.9 k Ω (8 V) 5.1 kΩ (9 V) 6.2 k Ω(10V)7.5kΩ(11V) 14 Pilot detector low-pass filter (forced mono) (VCO stop) VCC – 1.0 If a current of 50 µA or greater flows from this pin, the system is forced to mono. Connecting this pin to ground stops the VCO. The resistor limit values are the same as for pin 14. 15 Post amplifier input and output Vreg Vreg Output impedance ro = 200 Ω Pin 16: right output, pin 17: left output Inverting inputs Pin 18: right input, pin 19: left input RNF = 33 kΩ 16 17 18 19 MPX output 3.5 V 3.5 V Output impedance ro = 3.3 kΩ Pin 20: right de-emphasis Pin 21: left de-emphasis 20 21 Continued on next page. Continued from preceding page. |
Nº de peça semelhante - LA1837 |
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Descrição semelhante - LA1837 |
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