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INTEGRATED CIRCUITS
SA576 Low power compandor
Product specification IC17 Data Handbook 1997 Aug 14
Philips Semiconductors
Philips Semiconductors
Product specification
Low power compandor
SA576
DESCRIPTION
The SA576 is a unity gain level programmable compandor designed for low power applications. The SA576 is internally configured as an expandor and a compressor to minimize external component count. The SA576 can operate at 1.8V. During normal operations, the SA576 can operate from at least a 2V battery. If the battery voltage drops to 1.8V, this part will still continue to function, however, turning on the part at a VCC of 1.8V requires two external resistors to bring VREF to half VCC. One resistor connects between VCC and VREF; the other connects from VREF to ground. A typical value for these external resistors is approximately 20k. A lower value can be used, but the power consumption will go up. The SA576 is available in a 14-pin plastic DIP and SO packages.
PIN CONFIGURATION
D and N Packages
GCELLIN RECTIN EXPCAP EXPOUT 1 2 3 4 14 13 12 11 10 9 8 VCC COMPCAP2 COMPIN COMPCAP1 RECTIN GCELLIN COMPOUT
VREF 5 IREF GND 6 7
SR00713
FEATURES
* Operating voltage range: 1.8V to 7V * Low power consumption
(1.4mA @ 3.6V)
Figure 1. Pin Configuration
APPLICATIONS
* Over 80dB of dynamic range * Wide input/output swing capability
(rail-to-rail)
* Low external component count * ESD hardened
* Cordless telephone * Consumer audio * Wireless microphones * Modems * Electric organs * Hearing aids * Automatic level control
ORDERING INFORMATION
DESCRIPTION 14-Pin Plastic Dual In-Line Package (DIP) 14-Pin Plastic Small Outline (SO) TEMPERATURE RANGE -40 to +85C -40 to +85C ORDER CODE SA576N SA576D DWG # SOT27-1 SOT108-1
ABSOLUTE MAXIMUM RATINGS
RATING SYMBOL VCC TA TSTG JA Supply voltage Operating ambient temperature range Storage temperature range Thermal impedance DIP SO PARAMETER SA576 8 -40 to +85 -65 to +150 90 125 UNITS V C C C/W C/W
1997 Aug 14
10-2
853-1536 18287
Philips Semiconductors
Product specification
Low power compandor
SA576
BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT
10k EXPIN C1 + 10F R1* RECTIFIER 10k GAINCELL 10k
1
G
5k
14
COMPCAP2
VCC
RECTIN EXPCAP + C2 2.2F C3 + EXPOUT VREF C4 + 10F
2
30k 30k 10k
13
C7
+
C8 2.2F
3
EXPANDOR
12
+ COMPIN 10F COMPCAP1
4
10F
10k 8.6k RECTIFIER
11
+ C6 2.2F
5
VREF BANDGAP 10k VCC GND COMPRESSOR G GAINCELL
10
RECTIN R3*
6
R2*
IREF
9
10F
GCELLIN + C5 + C9 10F COMPOUT
7
GND
8
*R1, R2 and R3 are 1% resistors.
SR00714
Figure 2. Block Diagram and Test and Application Circuit
ELECTRICAL CHARACTERISTICS
TA = 25C, VCC = 3.6VDC, compandor 0dB level = -20dBV = 100mVRMS, output load RL = 10k, Freq = 1kHz, unless otherwise specified. R1, R2 and R3 are 1% resistors. LIMITS SYMBOL VCC ICC VREF RL THD ENO 0dB VOS PARAMETER Supply voltage1 Supply current Reference voltage2 Summing amp output load Total harmonic distortion Expandor output noise voltage Unity gain level Output voltage offset Expandor output DC shift Tracking error relative to 0dB output Crosstalk, COMP to EXP VO Output swing low Output swing high 1kHz, 0dB, BW = 3.5kHz BW = 20kHz, RS = 0 0dB at 1kHz No signal No signal to 0dB -20dB expandor 1kHz, 0dB, CREF = 10F -1.5 -150 -100 -1.0 No signal R2 = 100k VCC = 3.6V 10 0.25 10 0.18 1 7 0.3 -80 0.2 VCC - 0.2 1.5 30 1.5 150 100 1.0 TEST CONDITIONS MIN 2 SA576 TYP 3.6 1.4 1.8 MAX 7 3 V mA V k % V dB mV mV dB dB V UNITS
NOTE: 1. Operation down to VCC = 1.8V is possible, see description on front page of SA576 data sheet. 2. Reference voltage, VREF, is typically at 1/2 VCC.
1997 Aug 14
10-3
Philips Semiconductors
Product specification
Low power compandor
SA576
TYPICAL PERFORMANCE CHARACTERISTICS
VCC = 3.6V, TA = 25C, R1=R3=7.15k, R2=100k, 0dB level = 100mV, Freq. = 1kHz SUPPLY CURRENT vs SUPPLY VOLTAGE
1.6
SUPPLY CURRENT vs TEMPERATURE
1.8
1.5
1.6 1.4 SUPPLY CURRENT (mA) 1.4 SUPPLY CURRENT (mA)
1.3
1.2
1.2
1
0.8
1.1
0.6 1 2 3 4 5 6 SUPPLY VOLTAGE (V) 7 8
1 -40 -20 0 20 40 60 AMBIENT TEMPERATURE (C) 80 100
0.6
UNITY GAIN ERROR vs SUPPLY VOLTAGE
0.6 NOTE: UNITY GAIN ERROR MAY BE SET TO 0 AT ANY VCC BY ADJUSTING THE VALUE OF R1, R3 0.4 EXPANDOR
UNITY GAIN ERROR vs TEMPERATURE
0.4
EXPANDOR UNITY GAIN ERROR (dB) 0.2
0.2 UNITY GAIN ERROR (dB)
0 COMPRESSOR
0 COMPRESSOR
-0.2
-0.2
-0.4
-0.4
-0.6 2 3 4 5 SUPPLY VOLTAGE (V) 6 7
-0.6 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100
TRACKING ERROR vs INPUT LEVEL
1 NOTE: RELATIVE TO UNITY GAIN 0.5
THD vs TEMPERATURE
COMPRESSOR 0.5 EXPANDOR OUTPUT ERROR (dB) 0.4
0 COMPRESSOR
THD (%)
0.3 EXPANDOR
-0.5
0.2
-1 2 3 4 INPUT LEVEL (dB) 5 6
0.1 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100
SR00715
Figure 3. Typical Performance Characteristics
1997 Aug 14
10-4
Philips Semiconductors
Product specification
Low power compandor
SA576
DIP14: plastic dual in-line package; 14 leads (300 mil)
SOT27-1
1997 Aug 14
5
Philips Semiconductors
Product specification
Low power compandor
SA576
SO14: plastic small outline package; 14 leads; body width 3.9 mm
SOT108-1
1997 Aug 14
6
Philips Semiconductors
Product specification
Low power compandor
SA576
DEFINITIONS
Data Sheet Identification
Objective Specification
Product Status
Formative or in Design
Definition
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.
Preliminary Specification
Preproduction Product
Product Specification
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 APPLICATIONS 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 800-234-7381 (c) Copyright Philips Electronics North America Corporation 1997 All rights reserved. Printed in U.S.A.
Philips Semiconductors
1997 Aug 14 7

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