TDA8044 Datasheet, PDF (9/20 Pages) NXP Semiconductors – Satellite demodulator and decoder

Philips Semiconductors
Satellite demodulator and decoder
Product specification
TDA8044
Pin compatibility
The TDA8044 is backwards pin compatible with the TDA8043, this means that the functional pins of the TDA8043 have
been left unchanged on the TDA8044. However due to extra functionality of the TDA8044, some of the not connected
pins of the TDA8043 have become functional pins on the TDA8044. Table 1 lists the modified pins of the TDA8044.
Table 1 Modified pins of the TDA8044
PIN
TDA8043 FUNCTION
4 not connected
5 not connected
26 not connected
27 not connected
36 not connected
37 not connected
39 not connected
47 not connected
64 not connected
65 not connected
91 not connected
92 not connected
93 not connected
95 not connected
TDA8044 SYMBOL
CFS
V_SSD2
P5
P4
V_SSD6
V_SSD7
POR
V_SSD9
SCLT
SDAT
D22
V_SSD15
V_SSD16
V_SSD(test)
TDA8044 FUNCTION
clock frequency selection
digital ground
I/O expander bit 5
I/O expander bit 4
digital ground
digital ground
Power-on reset
digital ground
serial clock of I²C-bus loop-through
serial data of I²C-bus loop-through
22 kHz generation output
digital ground
digital ground
test pin, connect to ground
If it is required to replace the TDA8043 with the TDA8044 and the pins with extra functionality are not required, then the
following measures on the PCB layout must be taken to avoid I/O conflicts in the TDA8044:
• Pin numbers 4, 5, 26, 27, 36, 37, 47, 65, 92, 93 and 95 must be put to ground
• Pin numbers 39, 64 and 91 must be left not connected.
With these measures it is possible to use the TDA8043 and the TDA8044 on the same PCB without any problems.
In order to use pins with the extra functionality of the TDA8044, PCB layout changes are necessary.
2000 Feb 21
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