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TDA4851 Datasheet(PDF) 8 Page - NXP Semiconductors

Part No. TDA4851
Description  Horizontal and vertical deflection controller for VGA/XGA and autosync monitors
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 8 page
background image
November 1992
8
Philips Semiconductors
Preliminary specification
Horizontal and vertical deflection controller
for VGA/XGA and autosync monitors
TDA4851
Vertical sync input (DC-coupled, TTL-compatible)
V-sync on pin 10
Vi sync
sync input signal
(peak-to-peak value, pin 10)
1.7
−−
V
slicing level
1.2
1.4
1.6
V
I10
input current
0
< V10 < 5.5 V
−−
±10
µA
tp V
maximum vertical sync pulse width for
automatic vertical polarity switch
−−
300
µs
Horizontal mode detector output
VGA mode
V7
output saturation voltage LOW
(for Modes 1, 2 and 3)
I7 =6mA
0.275
0.33
V
output voltage HIGH
mode 4
−−
VP
V
I7
load current range to force VGA
mode-dependent vertical and parabola
amplitudes
modes 1, 2 and 3
2
6mA
output current
mode 4
0
mA
VGA / autosync mode switch
V7
input voltage LOW to force autosync
mode
0
50
mV
Horizontal clamping / blanking generator output
Fig.6
V8
output voltage LOW
−−
0.9
V
blanking output voltage
internal V blanking
1.6
1.9
2.2
V
clamping output voltage
H-sync on pin 9
5.15
5.4
5.65
V
I8
internal sink current for all output levels
H and V scanning
2.3
2.9
3.5
mA
external load current
−−
−3.0
mA
t8
clamping pulse start
with end of H-sync
tclp
clamping pulse width
V8 = 3 V
0.6
0.8
1.0
µs
S
steepness of rise and fall times
60
75
ns/V
Vertical oscillator
Vref = 6.25 V
f0
vertical free-running frequency
R15 =22kΩ;
C16 = 0.1 µF
42
Hz
fv
nominal vertical sync range
no f0 adjustment
50
110
Hz
V15
voltage on pin 15
R15 =22kΩ
2.8
3.0
3.2
V
td
delay between sync pulse and start of
vertical scan
measured on pin 8
in VGA/XGA mode, activated by an
external resistor on pin 7
500
575
650
µs
in autosync mode
V7 < 50 mV
240
300
360
µs
I12
control current for amplitude control
−±200
−µA
C12
capacitor for amplitude control
−−
0.18
µF
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT




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