TDA4884 Datasheet, PDF (13/28 Pages) NXP Semiconductors – Advanced monitor video controller for OSD

Philips Semiconductors
Three gain control video pre-amplifier for OSD
Product specification
TDA4884
handbook, full pagewinidpthut signals
input signal at
pins 2, 5 and 8
with sync (on green)
input clamping pulse
at pin 10
horizontal blanking and
output clamping pulse
at pin 9
internal signal
behind input stage
sync clipping to
artificial black level
output signals
(pins 19, 16 and 13)
at nominal gain and
maximum brightness setting
and
maximum/nominal/
minimum contrast setting
at nominal contrast and
maximum/nominal/
minimum gain setting
signal at CRT cathode
at nominal gain and
contrast setting
(brightness setting as well as
horizontal blanking via grid 1)
video signal
black level equal to
artificial black level + VBE
by input clamping (approximately 3 V)
video portion
horizontal flyback and output clamping
black level equal to artificial
black level by input clamping and
storage by coupling capacitor
inserted artificial black level
max
nom
min
max
nom
min
reference black level
reference black level
ultra black level
ground
high tension supply
voltage (e.g. 90 V)
black level
MHA920
1997 Nov 26
Fig.4 Signal processing.
13