LA1837(1997) Ver la hoja de datos (PDF) - SANYO -> Panasonic

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LA1837
(Rev.:1997)

Single-Chip Home Stereo IC with Electronic Tuning Support

SANYO -> Panasonic 

LA1837

Continued from preceding page.

Pin No.

Pin Function

Pin voltage (V)

Pin description

10 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.

11 FM S-meter output

0V

RL = 8 kΩ

AM S-meter output

12 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.

AM and FM IF buffer

13 output, output control

switch (mute switch)

V13 ≤ 0.5 V: Reception state

1.4 V ≤ V13 ≤ 2.2 V: IF buffer output turned

0V

on

V13 ≥ 3.5 V: IF buffer output and muting are

turned on

Phase comparator

14 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 kΩ (when VCC = 7 V)

3.9 kΩ (8 V) 5.1 kΩ (9 V)

6.2 kΩ (10 V) 7.5 kΩ (11 V)

Pilot detector low-pass

15 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.

16

17 Post amplifier input and

18 output

19

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

20

MPX output

21

3.5 V

3.5 V

Output impedance ro = 3.3 kΩ

Pin 20: right de-emphasis

Pin 21: left de-emphasis

Equivalent circuit

Continued on next page.

No. 5688-5/9

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