SA572 Datasheet, PDF (8/12 Pages) NXP Semiconductors – Programmable analog compandor

SA572
R₄
R_DC1
R_DC2
9.1kW
C₂ .1mF
C_DC
10mF
9.1kW
C_IN1
V_IN ^2.2mF
R₃
17.3kW
C₁
−
A1
+
1kW R₅
(6,10) V_REF
D₁ D₂
V_OUT
C_R
10mF
(5,11)
(2,14)
(4,12)
C_A
1mF
R_{1 (7,9)}
DG
6.8kW
C_IN2
2.2mF
BUFFER
3.3kW
R₂
(3,13)
C_IN3
2.2mF
(8)
V_CC ⁽¹⁶⁾
Figure 7. Basic Compressor Schematic
Basic Compandor System
The above basic compressor and expandor can be
applied to systems such as tape/disc noise reduction, digital
audio, bucket brigade delay lines. Additional system
design techniques such as bandlimiting, band splitting,
1
2
V_{RMS COMPRESSION}
IN
3.0 V
pre-emphasis, de-emphasis and equalization are easy to
incorporate. The IC is a versatile functional block to
achieve a high performance audio system. Figure 8 shows
the system level diagram for reference.
2
REL LEVEL ABS LEVEL
EXPANDOR
OUT
dB
dBM
+29.54
+11.76
547.6 mV
400 mV
100 mV
+14.77
+12.0
0.0
−3.00
−5.78
−17.78
10 mV
−20
−37.78
1 mV
100 mV
10 mV
Figure 8. SA572 System Level
http://onsemi.com
8
−40
−57.78
−60
−77.78
−80
−97.78