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INTEGRATED CIRCUITS
SA576
Low power compandor
Product specification |
1997 Aug 14 |
IC17 Data Handbook
m n r
Philips Semiconductors |
Product specification |
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Low power compandor |
SA576 |
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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
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GCELLIN |
1 |
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14 |
VCC |
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RECTIN |
2 |
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13 |
COMPCAP2 |
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EXPCAP |
3 |
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12 |
COMPIN |
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EXPOUT |
4 |
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11 |
COMPCAP1 |
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VREF |
5 |
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10 |
RECTIN |
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I |
6 |
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9 |
GCELLIN |
REF |
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GND |
7 |
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8 |
COMPOUT |
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SR00713
FEATURES |
Figure 1. Pin Configuration |
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•Operating voltage range: 1.8V to 7V |
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•Low power consumption |
APPLICATIONS |
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(1.4mA @ 3.6V) |
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•Cordless telephone |
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•Over 80dB of dynamic range |
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•Consumer audio |
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•Wide input/output swing capability |
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•Wireless microphones |
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(rail-to-rail) |
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•Low external component count |
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Modems |
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•ESD hardened |
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Electric organs |
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•Hearing aids |
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•Automatic level control |
ORDERING INFORMATION
DESCRIPTION |
TEMPERATURE RANGE |
ORDER CODE |
DWG # |
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14-Pin Plastic Dual In-Line Package (DIP) |
±40 to +85°C |
SA576N |
SOT27-1 |
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14-Pin Plastic Small Outline (SO) |
±40 to +85°C |
SA576D |
SOT108-1 |
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ABSOLUTE MAXIMUM RATINGS
SYMBOL |
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PARAMETER |
RATING |
UNITS |
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SA576 |
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VCC |
Supply voltage |
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8 |
V |
TA |
Operating ambient temperature range |
±40 to +85 |
°C |
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TSTG |
Storage temperature range |
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±65 to +150 |
°C |
θJA |
Thermal impedance |
DIP |
90 |
°C/W |
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SO |
125 |
°C/W |
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1997 Aug 14 |
10±2 |
853-1536 18287 |
Philips Semiconductors |
Product specification |
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Low power compandor |
SA576 |
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BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT
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10k |
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EXPIN |
C1 |
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GAINCELL |
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10k |
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+ |
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1 |
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14 |
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VCC |
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G |
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10μF |
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Σ |
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R1* |
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RECTIFIER |
10k |
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COMPCAP2 |
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5k |
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13 |
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RECTIN |
2 |
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+ |
C8 |
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2.2μF |
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EXPCAP |
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30k |
30k |
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10k |
C7 |
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+ |
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C2 |
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2.2μF |
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3 |
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12 |
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COMPIN |
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10μF |
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C3 |
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EXPANDOR |
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COMPCAP1 |
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+ |
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11 |
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EXPOUT |
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4 |
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Σ |
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+ C6 |
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10μF |
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10k |
RECTIFIER |
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2.2μF |
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VREF |
C4 |
+ |
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8.6k |
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5 |
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10 |
RECTIN |
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10μF |
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VREF |
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R3* |
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BANDGAP |
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10k |
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6 |
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9 |
GCELLIN |
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R2* |
IREF |
VCC |
COMPRESSOR |
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+ C5 |
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GND |
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GAINCELL |
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10μF |
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7 |
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8 |
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COMPOUT |
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C9 |
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10μF |
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GND |
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*R1, R2 and R3 are 1% resistors. |
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SR00714 |
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Figure 2. Block Diagram and Test and Application Circuit
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCC = 3.6VDC, compandor 0dB level = ±20dBV = 100mVRMS, output load RL = 10kΩ, Freq = 1kHz, unless otherwise specified. R1, R2 and R3 are 1% resistors.
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LIMITS |
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SYMBOL |
PARAMETER |
TEST CONDITIONS |
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SA576 |
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UNITS |
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MIN |
TYP |
MAX |
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VCC |
Supply voltage1 |
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2 |
3.6 |
7 |
V |
ICC |
Supply current |
No signal |
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1.4 |
3 |
mA |
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R2 = 100kΩ |
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V |
Reference voltage2 |
V |
CC |
= 3.6V |
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1.8 |
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V |
REF |
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RL |
Summing amp output load |
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10 |
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kΩ |
THD |
Total harmonic distortion |
1kHz, 0dB, BW = 3.5kHz |
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0.25 |
1.5 |
% |
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ENO |
Expandor output noise voltage |
BW = 20kHz, RS = 0Ω |
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10 |
30 |
μV |
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0dB |
Unity gain level |
0dB at 1kHz |
±1.5 |
0.18 |
1.5 |
dB |
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VOS |
Output voltage offset |
No signal |
±150 |
1 |
150 |
mV |
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Expandor output DC shift |
No signal to 0dB |
±100 |
7 |
100 |
mV |
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Tracking error relative to 0dB output |
-20dB expandor |
±1.0 |
0.3 |
1.0 |
dB |
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Crosstalk, COMP to EXP |
1kHz, 0dB, CREF = 10μF |
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±80 |
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dB |
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VO |
Output swing low |
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0.2 |
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Output swing high |
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VCC ± 0.2 |
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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 |
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