TDA4884 Ver la hoja de datos (PDF) - Philips Electronics
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TDA4884 Datasheet PDF : 28 Pages
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Philips Semiconductors
Three gain control video pre-amplifier for OSD
5 BLOCK DIAGRAM
Product specification
TDA4884
handbook, full pagewidth
VP
10 kΩ
1
gain
control
signal
input 22 nF
2
75 Ω 10 MΩ
VOLTAGE
CONVERTER
CLAMP
CLIPPING
VP
10 kΩ
3
gain
control
4
signal
input 22 nF
5
75 Ω 10 MΩ
VOLTAGE
CONVERTER
CHANNEL 1
CLAMP
CLIPPING
VP
10 kΩ
6
contrast
control
VP
7
signal
input 22 nF
8
75 Ω 10 MΩ
REF
GAIN
VOLTAGE
CONVERTER
CHANNEL 2
+
CLAMP
CLIPPING
horizontal blanking
switch off
9
VOLTAGE
CONVERTER
CHANNEL 3
input
clamping
blanking
test mode
ultra black
output clamping
10
clamping pulse
vertical blanking
test mode
PULSE
DECODER
VP = 8 V
6.2 V
TDA4884
current
20 output
1.5 kΩ
VCRT = 75 V
voltage
19 output
33 Ω
BFQ235
33 Ω
18 feedback
BAV21
220 Ω
68 kΩ
8V
15 kΩ
6.8 kΩ
10 kΩ
cut-off
control
current
17 output
1.5 kΩ
BFQ236
voltage
16 output
33 Ω
BFQ235
33 Ω
10 Ω
1 kΩ
10 Ω
15 feedback
BFQ256
VCRT = 75 V
BAV21
25 MHz
220 Ω 40 MHz
CRT
68 kΩ
8V
15 kΩ
6.8 kΩ
10 kΩ
60 MHz
cut-off
control
current
14 output
voltage
13 output
BFQ235
18 Ω
18 Ω
12 feedback
860 Ω
VCRT = 65 V
BFQ236
10 Ω
1 kΩ
47 nF
BAV21
100 Ω
10 Ω
BFQ256
93
kΩ
10 kΩ
VCRT2 = 65 V
10 kΩ
cut-off
control
5.8 V
11
VP
10 kΩ
gain
control
MHA917
1997 Nov 26
Fig.1 Block diagram and basic application circuit for DC and AC coupling.
4
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