Philips SA5752DK Datasheet

RF COMMUNICATIONS PRODUCTS

SA5752

Audio processor – companding, VOX and
amplifier section

Product Specification
Replaces data of December 6, 1993

IC17 Data Handbook

Philips Semiconductors

1997 Nov 07

Philips Semiconductors Product specification

SA5752Audio processor – companding, VOX and amplifier section

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.

FEA TURES

• 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

DK PACKAGE

PREAMP

RECT

NCAN

VOX

EXP

MIC

GRES

VOX

V

IN

GRES

CAP

OUT

TR

GND

REF

V

CC

CAP

1
2
3
4
5
6

SA5752

7
8
9

10

20

NCAN

19

COMP

18

COMP
COMP

17
16

COMP

15

COMP

14

VOX

CTL

13

HPDN

12

EXP

IN

EXP

11

OUT

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

OUT
IN
CAP3
CAP1

OUT
CAP2

SR00659

ORDERING INFORMATION

DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #

20-Pin Plastic Shrink Small Outline Package (SSOP) -40 to +85°C SA5752DK SOT266-1

1997 Nov 07 853-1721 18666

2

Philips Semiconductors Product specification

SA5752Audio processor – companding, VOX and amplifier section

PIN DESCRIPTIONS

PIN NO. SYMBOL DESCRIPTION

1 MIC
2 PREAMP
3 RECT
4 NCAN
5 VOX
6 VOX

IN

GRES

GRES

CAP

OUT

TR

7 GND Ground
8 V

9 V
10 EXP
11 EXP
12 EXP

REF

CC

CAP
OUT

IN

13 HPDN Hardware power-down
14 VOX
15 COMP
16 COMP
17 COMP
18 COMP
19 COMP
20 NCAN

CTL

CAP2

OUT
CAP1
CAP3

IN

OUT

Microphone input
Preamplifier gain resistor
Rectifier gain resistor
Noise cancellation timing capacitor
Voice operated transmission output
Voice operated transmission threshold resistor

Reference voltage
Positive supply
Expandor timing capacitor
Expandor output
Expandor input

Voice operated transmission control
Compressor capacitor 2 DC block
Compressor output
Compressor timing capacitor 1
Compressor capacitor 3 DC block
Compressor input
Noise cancellation output

BLOCK DIAGRAM

COMPANDOR

NOISE

CANCEL

PREAMP

12 1120 19 18 17 16 15 14 13

BUFFER

EXPANDOR

SA5752

VOX

BANDGAP

VOLTAGE REF

10987654321

SR00660

Figure 2. Block Diagram

1997 Nov 07

3

Philips Semiconductors Product specification

SYMBOL

PARAMETER

TEST CONDITIONS

UNIT

SYMBOL

PARAMETER

TEST CONDITIONS

UNIT

SA5752Audio processor – companding, VOX and amplifier section

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNIT

V

CC

V

IN

T

STG

T

A

DC ELECTRICAL CHARACTERISTICS

TA = 25oC, VCC = +3.0V , 0dB = 77.5mV

V

CC

I

CC

Z

L

Z

IN

V

OS

NOTES:

1. Compressor is tested in production with 50kΩ load.

2. Not tested in production.

3. Offset values are identical for both gain states of noise reduction circuit.

4. Operational down to V

Power supply voltage range -0.3 to 6 V
Voltage applied to any other pin -0.3 to (VCC+0.3) V
Storage temperature -65 to +150
Ambient operating temperature -40 to +85

. See test circuit, Figure 6.

RMS

LIMITS

MIN TYP MAX

Supply voltage 2.7
Supply current

No signal
Power down mode

4

3.0 5.5 V

3.1

4.0 mA

125

µA

Load impedance

pins NCAN
COMP

OUT

OUT

1

, EXP

OUT

50 kΩ
10 kΩ

Input impedance

COMP
EXP

IN

IN

2

, MIC

IN

40 50 60 kΩ

2.0 kΩ

Noise cancellation current Pin 6 25 µA

= 2V.

OUT

3

-50 –3.0 50 mV

DC offset NCAN

CC

o

°C

C

AC ELECTRICAL CHARACTERISTICS

TA = 25oC, VCC = +3.0V , 0dB level = 77.5mV

Preamplifier gain range
Preamplifier voltage gain 0dB
Preamplifier voltage gain 40dB

Preamplifier noise density

Switch amplifier gain 9 10 11 dB

Compandor 1kHz, all tests

COMP
COMP
COMP
COMP
COMP

EXP
EXP
EXP

OUT
OUT
OUT

Compressor error at -21dB output level Input level = -42dB –1.0 –0.16 1.0 dB

OUT

Compressor error at -10dB output level Input level = -20dB -1.0 –0.11 1.0 dB

OUT

Compressor error at 0dB output level Input level = 0dB -1.5 +0.1 1.5 dB

OUT

Compressor error at +5dB output level Input level = +10dB -1.0 +0.04 1.0 dB

OUT

Compressor error at +10dB output level Input level = +20dB -1.0 +0.02 1.0 dB

OUT

Expandor error at -42dB output level Input level = -21dB –1.0 –0.12 1.0 dB
Expandor error at -21dB output level Input level = -10.5dB -1.0 +0.1 1.0 dB
Expandor error at -10dB output level Input level = -5dB -1.0 +0.03 1.0 dB

1

RMS

. See test circuit, Figure 6.

Pin 2 open
Pin 2 AC ground

Pin 2 AC grounded
RS = 50kΩ
unweighted 20Hz-20kHz

weighted CCIR
DIN45405 20-20kHz

LIMITS

MIN TYP MAX

0

-1.0

39.0

0

40

40

1.0

41.0

7

8

dB
dB
dB

nV/√Hz
nV/√Hz

1997 Nov 07

4