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RF COMMUNICATIONS PRODUCTS
SA578 Unity gain level programmable low power compandor
Product specification Replaces data of 1993 December 15 IC17 Data Handbook 1997 Nov 07
Philips Semiconductors
Philips Semiconductors
Product specification
Unity gain level programmable low power compandor
SA578
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 600 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.
PIN CONFIGURATION
D Package
GCELLIN RECTIN EXPCAP EXPOUT 1 2 3 4 16 15 14 13 12 11 VCC COMPCAP2 COMPIN COMPCAP1 RECTIN GCELLIN
VREF 5 IREF GND PWRDN/ MUTE 6 7 8
FEATURES
* Operating voltage range: 1.8V to 7V * Low power consumption (1.4mA @ 3.6V) * 0dB level programmable * Over 90dB of dynamic range * Wide input/output swing capability * Low external component count * SA578 meets cellular radio specifications * ESD hardened * Power Down mode (ICC = 170A @ 3.6V) * Mute function * Multiple external summing capability * 600 drive capability
(10mVRMS to 1.0VRMS)
10 COMP OUT 9 SUM NODE
SR00719
Figure 1. Pin Configuration
APPLICATIONS
* High performance portable communications * Cellular radio * Cordless telephone * Consumer audio * Wireless microphones * Modems * Electric organs * Hearing aids * Automatic level control (ALC)
ORDERING INFORMATION
DESCRIPTION 16-Pin Plastic Small Outline (SO) TEMPERATURE RANGE -40 to +85C ORDER CODE SA578D DWG # SOT109-1
ABSOLUTE MAXIMUM RATINGS
SYMBOL VCC TA TSTG JA Supply voltage Operating ambient temperature range Storage temperature range Thermal impedance SO PARAMETER RATING SA578 8 -40 to +85 -65 to +150 125 UNITS V
C C C/W
1997 Nov 07
2
853-1537 18660
Philips Semiconductors
Product specification
Unity gain level programmable low power compandor
SA578
BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT
10k EXPIN C1 + 10F R1* RECTIFIER RECTIN EXPCAP + C2 2.2F C3 + EXPOUT 10F VREF C4 + 10F 10k 5k COMPCAP2 GAINCELL 10k
1
G
16
VCC
2
30k 30k 10k
15
C7
+
C8 2.2F
3
EXPANDOR
14
+ 10F COMPCAP1 COMPIN
4
10k 8.6k RECTIFIER
13
+ C6 2.2F
5
VREF BANDGAP 10k VCC GND PWRDN MUTE COMPRESSOR G GAINCELL
12
RECTIN R3*
6
R2*
IREF
11
GCELLIN + C5 10F
7
GND
10
R4 10k
+ C9 + 10F
COMPOUT
PWRDN/ MUTE *R1, R2 and R3 are 1% resistors.
8
9
SUMIN C10 10F
SR00720
Figure 2. Block Diagram and Test and Application Circuit
1997 Nov 07
3
Philips Semiconductors
Product specification
Unity gain level programmable low power compandor
SA578
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 PARAMETER TEST CONDITIONS MIN VCC ICC VREF RL THD ENO 0dB Supply voltage1 Supply current Reference voltage2 Summing amp minimum output load Total harmonic distortion Expandor output noise voltage Unity gain level Programmable range3 1kHz, 0dB, BW = 3.5kHz BW = 20kHz, RS = 0 0dB at 1kHz R1 = R3 = 18.7k, R2 = 24.3k R1 = R3 = 22.6k, R2 = 100k R1 = R3 = 7.15k, R2 = 100k R1 = R3 = 1.33k, R2 = 200k VOS Output voltage offset Expandor output DC shift Tracking error relative to 0dB output Crosstalk, COMP to EXP Output swing low VO Output swing high Power Down/Mute low level Power Down/Mute input current Pin 8 grounded 0 -65 No signal No signal to 0dB -20dB expandor 1kHz, 0dB, CREF = 10F -150 -100 -1.0 -1.0 operating power down No signal, R2 = 100k VCC = 3.6V 1.7 2 SA578 TYP 3.6 1.4 170 1.8 600 0.25 10 0.18 0 -10 -20 -40 1 7 0.3 -80 0.2 VCC - 0.2 0.4 V V A 150 100 1.0 -65 mV mV dB dB dBV 1.0 20 1.0 MAX 7 2 1.9 V mA A V % V dB UNITS
NOTE: 1. Operation down to VCC = 1.8V is possible. 2. Reference voltage, VREF, is typically at 1/2 VCC. 3. Unity gain level can be adjusted CONTINUOUSLY between -40dBV = 10mVRMS and 0dBV = 1.0VRMS. For details see application note AN1762.
1997 Nov 07
4
Philips Semiconductors
Product specification
Unity gain level programmable low power compandor
SA578
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 Nov 07
5
Philips Semiconductors
Product specification
Unity gain level programmable low power compandor
SA578
SO16: plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
1997 Nov 07
6
Philips Semiconductors
Product specification
Unity gain level programmable low power compandor
SA578
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 Nov 07 7

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