Changhong Electric PF2939, Service Manual, Page: 19 / 47

SERVICE MANUAL
17
TA1219AN (N901)
Audio/Video Switching IC for TVs
The TA1219AN is an audio/video switching IC for TV Sets.
Conforming to I
2
C bus standards, it allows you to
perform various switching operations through the bus
lines by using a microcomputer. Furthermore, since the
presence of a signal on its sync signal output pin can be
determined by a microcomputer , it is possible to check
each input/output channel (self-diagnosis).
This IC has the same pin assignments as the TA1218AN
(SDIP42), a 2-channel output version of the TA1219AN, so
these chips are pin compatible on pins 3 to 20 and 23 to
40 in TA1218AN.
1. Features
·
I
2
C bus control
·
Video: 5-channel inputs and 1-channel outputs (2 channels conforming to S system)
·
Audio: 5-channel inputs and 2-channel outputs
·
Self-diagnostic function
·
ADC inputs based on European 21-pin standards
·
ADC inputs based on S1/S2 terminal standards
·
Switchable subaddress