LA1838 View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

MFG CO.

LA1838

Single-Chip Home Stereo IC with Electronic Tuning Support

SANYO -> Panasonic 

Coil Specifications

• AM oscillator (for the DUT)

HW-50425 (Mitsumi)

3

4

Ž -  2T

 - ‘ 9T

2

 - x 86T

QO ≥ 80

1

6

L = 270 µH

A10633

LA1838

• IFT

YD-1073-1 (Mitsumi)

3

S4

2

1

6

S

YD-1073

SFU450B

A10634

 - x 58T

 - ‘ 7T

 - Ž 94T

fO = 450 kHz

QO = 110

A 180-pF capacitor is built in

With an external SFU450B

Pin Functions

Pin No.

Pin function

Pin voltage

Notes

1

FM IF input

Vreg

Input impedance ri = 330 Ω

2

AM mixer output

VCC

Connect the mixer coil between this pin and VCC

Equivalent circuit

1

3

2

A10635

A10636

1

3

FM IF input

bypass

Vreg

Also used for the MPX regulator filter

3

A10635

4

AM IF input

Vreg

5

GND

TU-LED

6

7

ST-LED,

AF-IF output

8

VCC

0V

VCC

VCC

VCC

9

FM detector

Vreg – 1.4

Input impedance ri = 2 kΩ

4

A10637

Active low

Open collector

AM stereo IF output (pin 7)

The influx current must be held under 150 µA.

The CDA10.7 MG74 (Murata Mfg. Co., Ltd.) is

recommended as the ceramic discriminator. A

device with a series resistance of 270 Ω must be

used.

6

7

A10638

28

9

A10639

Continued on next page.

No. 5888-4/9

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