Brightness/Bias Signal Electrical Characteristics
(See
Figure 3 for Test Circuit, and Table 1 for Control Test Settings Chart)
Unless otherwise noted: V
CC = +5V, VIN = 0.7V, CL = 8 pF, Video Signal Output = 1 VPP,TA = 25C, VABL =VCC.
Symbol
Parameter
Conditions
LM1253A
Units
Min
Typ
Max
V
BLANK MAX
Maximum Blanking Level
Test Setting 1
V
REF
0.90
V
BLANK MIN
Minimum Blanking Level
Test Setting 4
V
REF
V
t
BLK r
Blanking Rise Time
Test Setting 1, 10% to 90%,
10
ns
t
BLK f
Blanking Fall Time
Test Setting 1, 90% to 10%,
10
ns
OS
BLK MAX
Maximum Rise or Fall Edge
Overshoot
Test Setting 1, 10% to 90% or
90% to 10%, Settling Time Must
be Less Than 50 ns
20
%
OSD Electrical Characteristics
(See
Figure 3 for Test Circuit)
Unless otherwise noted: V
CC = +5V, VIN = 0.7V, CL = 8 pF, Video Signal Output = 1 VPP,TA = 25C, VABL =VCC.
Symbol
Parameter
Conditions
LM1253A
Units
Min
Typ
Max
V
OSDHIGH MAX
Maximum OSD Level with OSD
Contrast 11
Palette Set at 111. OSD Contrast
Level 11, Test Setting 3
V
REF
+
0.95
V
OSDHIGH 10
Maximum OSD Level with OSD
Contrast 10
Palette Set at 111. OSD Contrast
Level 10, Test Setting 3
V
REF
+
0.77
V
OSDHIGH 01
Maximum OSD Level with OSD
Contrast 01
Palette Set at 111. OSD Contrast
Level 01, Test Setting 3
V
REF
+
0.59
V
OSDHIGH 00
Maximum OSD Level with OSD
Contrast 00
Palette Set at 111. OSD Contrast
Level 00, Test Setting 3
V
REF
+
0.41
V
External Interface Signals Electrical Characteristics
(See
Figure 3 for Test Circuit)
Unless otherwise noted: V
CC = +5V, VIN = 0.7V, CL = 8 pF, Video Signal Output = 1 VPP,TA = 25C, VABL =VCC.
Symbol
Parameter
Conditions
LM1253A
Units
Min
Typ
Max
I
INMAX
Maximum normal forward scan current at
lowest horizontal frequency that input can
withstand
150
A
V
HBLANK TRIG
Voltage on H Flyback (Pin 14) which will
Trigger an HBLANK Signal
100V H Flyback Signal
through a 100 k
Resistor
0.8
V
I
IN+MAX
Maximum flyback scan current at 125 kHz
that input can withstand
1.5
mA
t
min hflb
Minimum Flyback Width
1
s
t
H
Horizontal Period
20
125
kHz
t
PW CLAMP
Minimum Clamp Pulse Width
200
ns
V
CLAMP L MAX
Maximum Low Level Clamp Pulse Voltage
1
V
CLAMP H MIN
Minimum High Level Clamp Pulse Voltage
3
V
VBLANK HIGH
Minimum High Level of Vertical Blank
Output
V
VREF BLANK < 0.75V
V
REF
+1
V
VBLANK LOW
Maximum Low Level of Vertical Blank
Output
I
VBLANK OUT = 100 A
V
REF
1
V
LM1253A
www.national.com
6