—3—

CXA1691BM/BS

Standard Circuit Design Data

(The pin numbers in the parenthesis are for CXA1691BS.)

Voltage (V)

No.

Symbol

Equivalent circuit

Description

FM AM FM AM

1

(1, 2)

2 (3)

3 (4)

27 (28)

4 (5)

5 (6)

6 (7)

8 (9)

7 (8)

MUTE

FM DISCRI

NF

AF OUT

VOL CONT

AM OSC

AFC

REG OUT

FM OSC

0000

2.18 2.70 4.88 5.43

1.5 1.5 3.0 3.0

1.5 1.5 3.0 3.0

1.25 1.25 1.25 1.25

1.25 1.25 1.25 1.25

1.25

∗ 1.25 ∗

1.25 1.25 1.25 1.25

1.25 1.25 1.25 1.25

2

1k

1.2k

3

27

GND

×100

×100

4

GND

20k

80k

5

3.6k

6

8

1.25V

(REG)

7

Phase-shift circuit Connect

ceramic discriminator

Negative feedback pin

Power amplifier output pin

Connect variable resistor for

electronic volume control.

AM local oscillation circuit

AFC variable capacitor pin

Regulator pin 1.25 V (Typ.)

FM local oscillation circuit