SA577 Datasheet, PDF (4/7 Pages) NXP Semiconductors – Unity gain level programmable power compandor

Philips Semiconductors
Unity gain level programmable low power compandor
Product specification
SA577
BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT
EXP_IN
C1
+
10µF
1
R1*
2
RECT_IN
EXP_CAP
+
C2
2.2µF
3
C3
+
EXP_{OUT 10µF}
4
V_REF
C4
+
5
10µF
6
R2*
7
GND
*R1, R2 and R3 are 1% resistors.
GAINCELL
10k
∆G
RECTIFIER 10k
10k
Σ
5k
EXPANDOR
V_REF
BANDGAP
I_REF
V_CC
GND
30k
30k
10k
Σ
10k
8.6k
RECTIFIER
COMPRESSOR
10k
∆G
GAINCELL
Figure 2. Block Diagram and Test and Application Circuit
14
V_CC
COMP_CAP2
13
+ ^C8
2.2µF
C7
12
+
COMP_IN
10µF
COMP_CAP1
11
+ _C6
2.2µF
10
RECT_IN
R3*
9
GCELL_IN
10µF ^{+ C5}
8
+
COMP_OUT
C9
10µF
SR00717
1997 Nov 07
4