TECHNICAL DATA
PCM CODEC - FILTER
IL145567
IL145567N is a one-chip PCM-cofidec which converts speech signal
into digital form and backwards. The IC is design to operate in
synchronous and asynchronous systems and is comprised of:
- reference generator;
- filters on switching capacitors in transmission and receipt channels ;
- two operational amplifiers.
The IC does signal companding under the A-low and full differential
processing of analogue signals for reduction of noises. Typical
dissipated power is 40mW, under reduced power – 1 mW at
±5
V.
ORDERING INFORMATION
IL145567N Plastic DIP
T
A
= -40° to 85° C
GS
X
ANBL
FS
X
CLKSEL
Vcc
VF
X
I-
Active RC-
filter of LF
GND
V
BB
3-poles filter
of HF
FS
R
MCLK
R
/ BCLK
R
/
MCLK
X
BCLK
X
PDN
5-poles
active filter
of LF
Control logic
TSx
VF
X
+
COMP
VPO+
Reference
generator
R-D-to-A
converter
С-D-to-A
converter
4
8
Shift
register
Transmitti
ng register
Dx
VPO−
4
VPI
VF
R
O
Active RC-
filter of LF
5-poles filter
of LF
Multi-
plexer
Receivin
Storage/hol
ding circuit
8
Receiving
register
D
R
g latch
Note – COMP – comparator
Figure 1 – Block diagram
1
INTEGRAL [ INTEGRAL CORP. ]
