TDA4884 查看數據表（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
Product specification
TDA4884
1 FEATURES
• 85 MHz video controller
• Fully DC controllable
• 3 separate video channels
• Input black-level clamping
• White level adjustment for 3 channels
• Contrast control for all 3 channels simultaneously
• Cathode feedback to internal reference for cut-off
control, which allows unstabilized video supply voltage
• Current outputs for RGB signal currents
• RGB voltage outputs to external peaking circuits
• Blanking and switch-off input for screen protection
• Sync on green operation possible
• On Screen Display (OSD) facility.
2 GENERAL DESCRIPTION
The TDA4884 is an RGB pre-amplifier for colour monitor
systems with SVGA performance, intended for DC or AC
coupling of the colour signals to the cathodes of the CRT.
With special advantages the circuit can be used in
conjunction with the TDA485x monitor deflection IC family.
3 QUICK REFERENCE DATA
SYMBOL
VP
IP
Vi(b-w)
Vo(b-w)
Io(b-w)
B
Gnom
∆G
CRcontrast
COSD(min)
Tamb
PARAMETER
CONDITIONS
positive supply voltage
supply current
input voltage (black-to-white; pins 2, 5
and 8)
output voltage (black-to-white; pins 19, nominal contrast; pins 3,
16 and 13)
1 and 11 open-circuit
output current (black-to-white; pins 20,
17 and 14)
bandwidth
with peaking
−3 dB
nominal gain (pins 2, 5 and 8 to pins 19, nominal contrast; pins 3,
16 and 13)
1 and 11 open-circuit
gain control difference for all channels
contrast control
minimum contrast for OSD
operating ambient temperature
relative to Gnom
Vi(CC) = 1 to 6 V
Vi(CC) = 0.7 V
MIN.
7.2
36
−
−
−
−
70
−
−5
−22
−
−20
TYP.
8.0
48
0.7
0.79
50
−
85
1
−
−
−40
−
MAX.
8.8
60
1.0
−
−
100
−
−
+2.6
+3.4
−
+70
UNIT
V
mA
V
V
mA
mA
MHz
dB
dB
dB
dB
°C
4 ORDERING INFORMATION
TYPE
NUMBER
TDA4884
NAME
DIP20
PACKAGE
DESCRIPTION
plastic dual in-line package; 20 leads (300 mil)
VERSION
SOT146-1
1997 Nov 26
3
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