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 V
CC
of 1.8V requires two external resistors to bring
V
REF
to half V
CC
. One resistor connects between V
CC
and V
REF
;
the other connects from V
REF
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
GCELL
IN
RECT
IN
1
2
14
13
12
11
10
9
8
V
CC
COMP
CAP2
COMP
IN
COMP
CAP1
RECT
IN
GCELL
IN
COMP
OUT
EXP
CAP
3
EXP
OUT
4
V
REF
5
I
REF
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 +85°C
–40 to +85°C
ORDER CODE
SA576N
SA576D
DWG #
SOT27-1
SOT108-1
ABSOLUTE MAXIMUM RATINGS
RATING
SYMBOL
V
CC
T
A
T
STG
θ
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
EXP
IN
C1
+
10µF
R1*
RECTIFIER
10k
GAINCELL
10k
1
∆G
Σ
5k
14
COMP
CAP2
V
CC
RECT
IN
EXP
CAP
+
C2
2.2µF
C3
+
EXP
OUT
V
REF
C4
+
10µF
2
30k
30k
10k
13
C7
+
C8
2.2µF
3
EXPANDOR
12
+
COMP
IN
10µF
COMP
CAP1
4
10µF
Σ
10k
8.6k
RECTIFIER
11
+ C6
2.2µF
5
V
REF
BANDGAP
10k
V
CC
GND
COMPRESSOR
∆G
GAINCELL
10
RECT
IN
R3*
6
R2*
I
REF
9
10µF
GCELL
IN
+ C5
+
C9
10µF
COMP
OUT
7
GND
8
*R1, R2 and R3 are 1% resistors.
SR00714
Figure 2. Block Diagram and Test and Application Circuit
ELECTRICAL CHARACTERISTICS
T
A
= 25
°
C, V
CC
= 3.6VDC, compandor 0dB level = –20dBV = 100mV
RMS
, output load R
L
= 10kΩ, Freq = 1kHz, unless otherwise specified.
R1, R2 and R3 are 1% resistors.
LIMITS
SYMBOL
V
CC
I
CC
V
REF
R
L
THD
E
NO
0dB
V
OS
Supply
PARAMETER
voltage
1
No signal
R
2
= 100kΩ
V
CC
= 3.6V
10
1kHz, 0dB, BW = 3.5kHz
BW = 20kHz, R
S
= 0Ω
0dB at 1kHz
No signal
No signal to 0dB
-20dB expandor
1kHz, 0dB, C
REF
= 10µF
–1.5
–150
–100
–1.0
0.25
10
0.18
1
7
0.3
–80
0.2
V
CC
– 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
kΩ
%
µV
dB
mV
mV
dB
dB
V
UNITS
Supply current
Reference voltage
2
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
Output swing low
Output swing high
V
O
NOTE:
1. Operation down to V
CC
= 1.8V is possible, see description on front page of SA576 data sheet.
2. Reference voltage, V
REF
, is typically at 1/2 V
CC
.
1997 Aug 14
10–3
Philips Semiconductors
Product specification
Low power compandor
SA576
TYPICAL PERFORMANCE CHARACTERISTICS
V
CC
= 3.6V, T
A
= 25°C, R1=R3=7.15kΩ, R2=100kΩ, 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 V
CC
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
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