LA8638NV Просмотр технического описания (PDF) - SANYO -> Panasonic

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LA8638NV

Low-Voltage Compander IC for Cordless Telephones

SANYO -> Panasonic 

LA8638NV

Pin Descriptions

Pin Number

1

Pin Name

GND

Pin Voltage

2

1/2 VCC

VCC/2

29

VREF

VCC/2

3

CMP-NF

VCC/2

Equivalent Circuit

VCC

2

+

–

VREF

+

IN

–

45kΩ

29

A13523

VCC

22.5kΩ 22.5kΩ

3

A13524

REGURATOR VREF2 +

4

DT-VREF

1.25 V

4

–

5

RX-IN

1.25 V power

supply

6

RX-FIL-OUT

1.25 V

5

+

500Ω

–

A13525

TO DTSH IN

6

100kΩ

A13526

VREF

7

EXP-IN

VCC/2

7

30kΩ

VCC

VREF

+

8

Indeterminate

8

EXP-RCT (when there is

no signal)

–

15kΩ

Description

Ground for all circuits except BTL amplifier

Resistance voltage divider pin

Reference voltage for all circuits except

receiver block

AC feedback control for compressor's

summing amplifier

DC gain: 1 AC gain: Infinite

Reference voltage for receiver block.

This supplies the bias voltage for pin 5.

Filter buffer input

Filter buffer output

Expander input. Voltage-current converter

input. Full-wave rectifier input.

Full-wave rectifier output for expander block

(AC smoothing)

A13527

9

RX-ATT-ADJ

0.03 V

BIAS CIRCUIT

VCA

ATT CIRCUIT

Pin for setting attenuation for receiver output

level switching

9

A13528

10

RX-OUT

VCC/2

VREF

IN

+

–

60kΩ

10

Receiver block output

A13529

Continued on next page.

No. 6627-9/16

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