Datasheet SA578D Datasheet (Philips)

RF COMMUNICATIONS PRODUCTS

SA578

Unity gain level programmable low power
compandor

Product specification
Replaces data of 1993 December 15

IC17 Data Handbook

Philips Semiconductors

1997 Nov 07

Philips Semiconductors Product specification

SYMBOL

PARAMETER

UNITS

SA578Unity gain level programmable low power compandor

DESCRIPTION

The SA578 is a unity gain level programmable compandor designed
for low power applications. The SA578 is internally configured as an
expandor and a compressor to minimize external component count.

The summing amplifiers of the SA578 have 600Ω drive capability
and the inverting input of the compressor amplifier is accessible
through Pin 9 for summing multiple external signals. Power
Down/Mute function is active low and requires an open collector
output logic configuration at Pin 8. If Power Down/Mute is not
needed, Pin 8 should be left open. When the part is muted, supply
current drops to 170mA at 3.6V .

FEATURES

•Operating voltage range: 1.8V to 7V

•Low power consumption (1.4mA @ 3.6V)

•0dB level programmable

(10mV

RMS

to 1.0V

RMS

)

•Over 90dB of dynamic range

•Wide input/output swing capability

•Low external component count

•SA578 meets cellular radio specifications

•ESD hardened

•Power Down mode (I

= 170µA @ 3.6V)

CC

•Mute function

•Multiple external summing capability

•600Ω drive capability

PIN CONFIGURATION

D Package

GCELL

RECT

EXP

EXP

PWRDN/

1

IN

2

IN

3

CAP

4

OUT

5

V

REF

6

I

REF

7

GND

89

MUTE

Figure 1. Pin Configuration

16
15
14
13
12
11
10

V
COMP

COMP
COMP

RECT
GCELL

COMP
SUM NODE

APPLICATIONS

•High performance portable communications

•Cellular radio

•Cordless telephone

•Consumer audio

•Wireless microphones

•Modems

•Electric organs

•Hearing aids

•Automatic level control (ALC)

CC

CAP2
IN
CAP1

IN

IN

OUT

SR00719

ORDERING INFORMATION

DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #

16-Pin Plastic Small Outline (SO)

–40 to +85°C

SA578D SOT109-1

ABSOLUTE MAXIMUM RATINGS

RATING

SA578

V

CC

T

A

T

STG

θ

JA

1997 Nov 07 853-1537 18660

Supply voltage 8 V
Operating ambient temperature range –40 to +85
Storage temperature range –65 to +150
Thermal impedance SO 125

2

°C
°C

°C/W

Philips Semiconductors Product specification

SA578Unity gain level programmable low power compandor

BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT

C1

EXP

IN

+

10µF

RECT

EXP

CAP

+

2.2µF

C2

C3

+

OUT

V

REF

PWRDN/
MUTE

R2*

10µF

C4

10µF

+

GND

EXP

*R1, R2 and R3 are 1% resistors.

IN

R1*

10k

Σ

5k

1

GAINCELL

10k

RECTIFIER

∆G

10k

2

30k 30k 10k

3

EXPANDOR

4

Σ

8.6k

5

V

REF

6

I

REF

BANDGAP

PWRDN

GND

V

MUTE

CC

COMPRESSOR

7

8

Figure 2. Block Diagram and Test and Application Circuit

10k

RECTIFIER

∆G

GAINCELL

10k

16

15

14

13

12

11

10

V

CC

COMP

CAP2

C8

+

2.2µF

C7

+

COMP

10µF

COMP

CAP1

RECT

R3*

GCELL

+

C5

10µF

R4

10kΩ

9

+

C10

10µF

IN

+

C6

2.2µF

IN

IN

+

COMP

SUM

IN

SR00720

OUT

10µF

C9

1997 Nov 07

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Philips Semiconductors Product specification

dBV

V

V

SA578Unity gain level programmable low power compandor

ELECTRICAL CHARACTERISTICS

TA = 25°C, VCC = 3.6VDC, compandor 0dB level = –20dBV = 100mV
R1, R2 and R3 are 1% resistors.

SYMBOL PARAMETER TEST CONDITIONS SA578 UNITS

V

I

V

Supply voltage

CC

Supply current operating

CC

Reference voltage

REF

R

Summing amp minimum output load 600 Ω

L

1

2

power down

No signal, R2 = 100kΩ

THD Total harmonic distortion 1kHz, 0dB, BW = 3.5kHz 0.25 1.0 %

E

Expandor output noise voltage BW = 20kHz, RS = 0Ω 10 20 µV

NO

0dB Unity gain level 0dB at 1kHz –1.0 0.18 1.0 dB

Programmable range

3

R1 = R3 = 18.7kΩ, R2 = 24.3kΩ 0

R1 = R3 = 22.6kΩ, R2 = 100kΩ –10
R1 = R3 = 7.15kΩ, R2 = 100kΩ –20
R1 = R3 = 1.33kΩ, R2 = 200kΩ –40

V

Output voltage offset No signal –150 1 150 mV

OS

Expandor output DC shift No signal to 0dB –100 7 100 mV
Tracking error relative to 0dB output -20dB expandor –1.0 0.3 1.0 dB
Crosstalk, COMP to EXP 1kHz, 0dB, C
Output swing low 0.2

O

Output swing high VCC – 0.2
Power Down/Mute low level 0 0.4 V
Power Down/Mute input current Pin 8 grounded –65 µA

, output load RL = 10kΩ, Freq = 1kHz, unless otherwise specified.

RMS

LIMITS

MIN TYP MAX

2 3.6 7 V

1.4

2 mA

170

VCC = 3.6V 1.7 1.8 1.9 V

= 10µF –80 –65 dB

REF

µA

NOTE:

1. Operation down to V

2. Reference voltage, V

3. Unity gain level can be adjusted CONTINUOUSLY between –40dBV = 10mV

= 1.8V is possible.

CC

, is typically at 1/2 VCC.

REF

AN1762.

and 0dBV = 1.0V

RMS

. For details see application note

RMS

1997 Nov 07

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Philips Semiconductors Product specification

SA578Unity gain level programmable low power compandor

TYPICAL PERFORMANCE CHARACTERISTICS

VCC = 3.6V, TA = 25°C, R1=R3=7.15kΩ, R2=100kΩ, 0dB level = 100mV , Freq. = 1kHz

SUPPLY CURRENT vs SUPPLY VOLTAGE

SUPPLY CURRENT vs TEMPERATURE

1.6

1.8

1.6

1.4

1.2

1

SUPPLY CURRENT (mA)

0.8

0.6
12345678

UNITY GAIN ERROR vs SUPPLY VOLTAGE

0.6
NOTE: UNITY GAIN ERROR MAY BE

SET TO 0 AT ANY V
ADJUSTING THE VALUE OF R1, R3

0.4

0.2

0

-0.2

SUPPLY VOLTAGE (V)

BY

CC

COMPRESSOR

EXPANDOR

1.5

1.4

1.3

1.2

SUPPLY CURRENT (mA)

1.1

1

-40 -20 0 20 40 60 80 100

UNITY GAIN ERROR vs TEMPERATURE

0.6

0.4

0.2

0

-0.2

AMBIENT TEMPERATURE (°C)

EXPANDOR

COMPRESSOR

UNITY GAIN ERROR (dB)

-0.4

-0.6
234567

TRACKING ERROR vs INPUT LEVEL

1

0.5

0

OUTPUT ERROR (dB)

-0.5

-1
23456

SUPPLY VOLTAGE (V)

EXPANDOR

COMPRESSOR

INPUT LEVEL (dB)

NOTE: RELATIVE
TO UNITY GAIN

Figure 3. Typical Performance Characteristics

UNITY GAIN ERROR (dB)

-0.4

-0.6

-40 -20 0 20 40 60 80 100

0.5

0.4

0.3

THD (%)

0.2

0.1

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

THD vs TEMPERATURE

COMPRESSOR

EXPANDOR

TEMPERATURE (°C)

SR00715

1997 Nov 07

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Philips Semiconductors Product specification

SA578Unity gain level programmable low power compandor

SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

1997 Nov 07

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Philips Semiconductors Product specification

SA578Unity gain level programmable low power compandor

DEFINITIONS

Data Sheet Identification Product Status Definition

Objective Specification

Preliminary Specification

Product Specification

Formative or in Design

Preproduction Product

Full Production

Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.

LIFE SUPPORT APPLICA TIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected

to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.

Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone [phone]

This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.

This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.

This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.

 Copyright Philips Electronics North America Corporation 1997

All rights reserved. Printed in U.S.A.

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1997 Nov 07

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