Philips Semiconductors

Product specification

SA5752

Audio processor – companding, VOX and amplifier section

2

1997 Nov 07

853-1721 18666

DESCRIPTION

The SA5752 is a high performance low power audio signal

processing system especially designed to meet the requirements for

small size and low voltage operation of hand-held equipment. The

SA5752 subsystem includes a low noise microphone preamplifier

with adustable gain, a noise cancellation switching amplifier with

adjustable threshold, a voice operated transmitter (VOX) switch,

VOX control, an audio compressor with buffered input, audio

expandor, and an internal bandgap voltage regulator with power

down capability. When used with Philips Semiconductors’ SA5753,

the complete audio processing function of an AMPS or TACS

cellular telephone is easily implemented. The system also meets

the requirements of the proposed NAMPS or NTACS specifications.

The SA5752 can also be used without the SA5753 in a wide variety

of radio communications applications.

FEATURES

• Operating voltage range: 2V to 5.5V

• Miniature SSOP

• High performance

• Adjustable VOX and noise cancellation threshold

• Adjustable gain preamplifier

• Audio companding

• ESD protected

• Open collector VOX output

• Logic inputs CMOS compatible

• Power down mode

• Few external components

• Meets AMPS/TACS/NAMPS/NTACS requirements

PIN CONFIGURATION

MICIN

RECTGRES

VOXOUT

VOXTR

GND

VREF

EXPOUT

HPDN

VOXCTL

COMPCAP2

COMPCAP3

NCANOUT

DK PACKAGE

1

2

3

4

5

6

7

8

9

10

11

12

13

14

20

19

18

17

16

15

PREAMPGRES

NCANCAP

VCC

EXPCAP

COMPIN

COMPCAP1

COMPOUT

EXPIN

SA5752

SR00659

Figure 1. Pin Configuration

BENEFITS

• Very compact applications

• Long battery life in portable equipment

• Complete cellular audio function with the SA5753

APPLICATIONS

• Cellular radio

• Mobile communications

• High performance cordless telephones

• 2-way radio

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

20-Pin Plastic Shrink Small Outline Package (SSOP)

-40 to +85

°C

SA5752DK

SOT266-1