TDA4885 Datasheet, PDF (20/56 Pages) NXP Semiconductors – 150 MHz video controller with I2C-bus

Philips Semiconductors
150 MHz video controller with I²C-bus
Product specification
TDA4885
28. The external reference voltages act under I²C-bus control independent from control bit FPOL; subaddress 07H
(REF₁), 08H (REF₂) and 09H (REF₃; bit resolution 0.4% of voltage range).
29. Slow variations of video supply voltage V_CRT will be suppressed at CRT cathode by the clamping feedback loop.
A change of V_CRT with 5 V leads to a specified change of the cathode voltage.
handbook, full pagewidth ^{input signals}
input video signal
with syncs
at pins 6, 8 and 10
input clamping pulses
at pin 5
blanking/output
clamping pulses
at pin 11
input reference
black level
the syncs will be clipped
to reference black level
internally
MHA344
The input video signals have to be on black level during input clamping.
Fig.3 Input signals.
1997 Nov 25
20