SA578 Datasheet, PDF (3/7 Pages) NXP Semiconductors – Unity gain level programmable low power compandor

Philips Semiconductors
Unity gain level programmable low power compandor
Product specification
SA578
BLOCK DIAGRAM and TEST AND APPLICATION CIRCUIT
EXP_IN
C1
+
10µF
R1*
RECT_IN
EXP_CAP
+
C2
2.2µF
C3
+
EXP_OUT 10µF
V_REF
C4
+
10µF
R2*
GND
PWRDN/
MUTE
*R1, R2 and R3 are 1% resistors.
GAINCELL
10k
1
∆G
RECTIFIER 10k
2
10k
Σ
5k
3
EXPANDOR
4
5
V_REF
BANDGAP
6
I_REF
V_CC
GND
PWRDN
MUTE
7
8
16
30k
30k
15
10k
14
Σ
10k
8.6k
13
RECTIFIER
12
COMPRESSOR
10k
∆G
11
GAINCELL
10
9
Figure 2. Block Diagram and Test and Application Circuit
V_CC
COMP_CAP2
+ ^C8
2.2µF
C7
+
10µF
COMP_IN
COMP_CAP1
+ _C6
2.2µF
RECT_IN
R3*
GCELL_IN
+ _C5
10µF
+
COMP_OUT
C9 10µF
R4
10kΩ ₊
SUM_IN
C10
10µF
SR00720
1997 Nov 07
3