SA576 Datasheet, PDF (3/7 Pages) NXP Semiconductors – Low power compandor

Philips Semiconductors
Low power compandor
Product specification
SA576
BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT
EXP_IN
C1
+
10µF
R1*
RECT_IN
EXP_CAP
+
C2
2.2µF
EXP_OUT
C3
+
10µF
V_REF
C4
+
10µF
R2*
GAINCELL
10k
1
∆G
RECTIFIER 10k
2
10k
Σ
5k
3
EXPANDOR
4
5
V_REF
BANDGAP
6
I_REF
V_CC
GND
7
GND
14
V_CC
COMP_CAP2
13
+ ^C8
2.2µF
30k
30k
Σ
10k
8.6k
10k
12
11
RECTIFIER
C7
+
10µF
COMP_IN
COMP_CAP1
+ _C6
2.2µF
10
RECT_IN
COMPRESSOR
10k
∆G
GAINCELL
R3*
9
GCELL_IN
10µF ^{+ C5}
8
+
COMP_OUT
C9
10µF
*R1, R2 and R3 are 1% resistors.
Figure 2. Block Diagram and Test and Application Circuit
SR00714
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
PARAMETER
TEST CONDITIONS
SA576
UNITS
V_CC
I_CC
V_REF
R_L
THD
E_NO
0dB
Supply voltage¹
Supply current
Reference voltage²
Summing amp output load
Total harmonic distortion
Expandor output noise voltage
Unity gain level
No signal
R₂ = 100kΩ
V_CC = 3.6V
1kHz, 0dB, BW = 3.5kHz
BW = 20kHz, R_S = 0Ω
0dB at 1kHz
MIN
TYP
MAX
2
3.6
7
V
1.4
3
mA
1.8
V
10
kΩ
0.25
1.5
%
10
30
µV
–1.5
0.18
1.5
dB
V_OS Output voltage offset
Expandor output DC shift
No signal
No signal to 0dB
–150
1
150
mV
–100
7
100
mV
Tracking error relative to 0dB output
-20dB expandor
–1.0
0.3
1.0
dB
Crosstalk, COMP to EXP
Output swing low
V_O
Output swing high
1kHz, 0dB, C_REF = 10µF
–80
dB
0.2
V
V_CC – 0.2
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