Philips sa576 DATASHEETS
INTEGRATED CIRCUITS
SA576
Low power compandor
Product specification 1997 Aug 14
IC17 Data Handbook
Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNITS
SA576Low power compandor
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 V
V
to half VCC. One resistor connects between VCC and V
REF
the other connects from V
of 1.8V requires two external resistors to bring
CC
to ground. A typical value for these
REF
REF
;
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.
FEATURES
•Operating voltage range: 1.8V to 7V
•Low power consumption
(1.4mA @ 3.6V)
•Over 80dB of dynamic range
•Wide input/output swing capability
(rail-to-rail)
•Low external component count
•ESD hardened
PIN CONFIGURATION
D and N Packages
OUT
V
I
REF
GND
IN
IN
CAP
REF
1
2
3
4
5
6
7
GCELL
RECT
EXP
EXP
Figure 1. Pin Configuration
APPLICATIONS
•Cordless telephone
•Consumer audio
•Wireless microphones
•Modems
•Electric organs
•Hearing aids
•Automatic level control
14
V
CC
13
COMP
CAP2
12
COMP
IN
11
COMP
CAP1
10
RECT
IN
9
GCELL
IN
8
COMP
OUT
SR00713
ORDERING INFORMATION
DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
14-Pin Plastic Dual In-Line Package (DIP) –40 to +85°C SA576N SOT27-1
14-Pin Plastic Small Outline (SO) –40 to +85°C SA576D SOT108-1
ABSOLUTE MAXIMUM RATINGS
RATING
SA576
T
V
θ
CC
T
A
STG
JA
Supply voltage 8 V
Operating ambient temperature range –40 to +85 °C
Storage temperature range –65 to +150 °C
Thermal impedance DIP
SO
90
125
°C/W
°C/W
1997 Aug 14 853-1536 18287
10–2
Philips Semiconductors Product specification
V
V
SA576Low power compandor
BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT
C1
EXP
IN
+
10µF
RECT
EXP
CAP
+
2.2µF
C2
C3
EXP
OUT
10µF
C4
V
REF
*R1, R2 and R3 are 1% resistors.
+
10µF
R2*
V
REF
GND
10k
C7
10µF
CAP2
+
CAP1
RECT
R3*
GCELL
+
C5
+
V
C8
COMP
+
IN
C9
10µF
CC
2.2µF
C6
2.2µF
IN
IN
COMP
SR00714
OUT
Σ
5k
14
COMP
13
30k 30k 10k
Σ
10k
8.6k
RECTIFIER
12
11
+
COMP
10
10k
V
CC
COMPRESSOR
∆G
GAINCELL
9
10µF
8
GAINCELL
10k
1
R1*
IN
RECTIFIER
2
∆G
10k
3
+
4
EXPANDOR
5
6
I
REF
BANDGAP
7
GND
Figure 2. Block Diagram and Test and Application Circuit
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCC = 3.6VDC, compandor 0dB level = –20dBV = 100mV
R1, R2 and R3 are 1% resistors.
SYMBOL PARAMETER TEST CONDITIONS SA576 UNITS
1
2
V
V
I
Supply voltage
CC
Supply current
CC
Reference voltage
REF
R
Summing amp output load 10 kΩ
L
THD Total harmonic distortion 1kHz, 0dB, BW = 3.5kHz 0.25 1.5 %
E
Expandor output noise voltage BW = 20kHz, RS = 0Ω 10 30 µV
NO
0dB Unity gain level 0dB at 1kHz –1.5 0.18 1.5 dB
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
NOTE:
1. Operation down to V
2. Reference voltage, V
= 1.8V is possible, see description on front page of SA576 data sheet.
CC
, is typically at 1/2 VCC.
REF
, output load RL = 10kΩ, Freq = 1kHz, unless otherwise specified.
RMS
LIMITS
MIN TYP MAX
2 3.6 7 V
No signal
= 100kΩ
R
2
1.4 3 mA
VCC = 3.6V 1.8 V
= 10µF –80 dB
REF
1997 Aug 14
10–3
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