Continued from preceding page.

No. 5888-6/9

LA1838

Pin No.

Pin function

Pin voltage

Notes

Equivalent circuit

2.9 V

MPX input

22

22

A10648

2.8 V (FM)

2.8 V (AM)

FM demodulator

output

23

The channel separation can be adjusted with an

external capacitor connected between this pin and

ground.

23

A10649

0 V (FM)

0.5 V (AM)

AM detector

output

24

The AM frequency characteristics can be adjusted

by modifying the time constant of the circuit

connected between this pin and pin 22 and

between this pin and ground.

A10650

24

0 V (FM)

0.5 V (AM)

AM AGC

25

The resistance of the built-in resistor R is 11 k

Ω

25

A10651

Vreg

AFC

26

The FM SD bandwidth can be adjusted with the

external resistor connected between this pin and

pin 28

26

A10652

Vreg

AM RF input

27

Must be used at the same potential as pin 28

27

A10653

Vreg

REG

28

Vreg = 3.6 V

28

A10654

Vreg

OSC

29

Connect the oscillator coil between this pin and

pin 28

29

A10655

1.6 V (FM)

1.3 V (AM)

Oscillator buffer

output,

FM SD sensitivity

adjustment

30

The FM SD sensitivity can be adjusted with an

external resistor connected between this pin and

ground.

30

A10656