LM1246AAA National Semiconductor, LM1246AAA Datasheet - Page 5

• Manufacturer Part Number: LM1246AAA
• Description: 150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM/ 512 Character RAM and 4 DACs
• Manufacturer: National Semiconductor

V
V
Mode 00
V
Mode 01
∆V
(Temp)
∆V
Linearity
Monotonicity
I
V
V
V
V
V
I
I
V
f
f
I
I
I
I
I
t
t
V
f
t
V
MAX
L
H
H
H
HFB IN
IN
HFB OUT
OUT
IN THRESHOLD
H-BLANK ON
H-BLANK OFF
FREERUN
PW CLAMP
Min DAC
Max DAC
Max DAC
VTH+
SPOT
Ref
IL
IH
OL
BLANK
CLAMP MAX
DAC Output Electrical Characteristics
Unless otherwise noted: T
for Min and Max parameters and (Note 6) for Typicals. DAC parameters apply to all 4 DACs.
System Interface Signal Characteristics
Unless otherwise noted: T
for Min and Max parameters and (Note 6) for Typicals. DAC parameters apply to all 4 DACs.
(SCL, SDA)
(SCL, SDA)
Min
Max
Max DAC
Max DAC
(SCL, SDA)
(SCL, SDA)
(SCL, SDA)
Symbol
Symbol
Max
Max
Max
(V
CC
)
Min Output Voltage of DAC
Max Output Voltage of DAC
Max Output Voltage of DAC in
DCF Mode 01
DAC Output Voltage Variation
with Temperature
DAC Output Voltage Variation
with V
Linearity of DAC over its Range
Monotonicity of the DAC
Excluding Dead Zones
Max Load Current
VFLYBACK Positive Switching
Guarantee
Spot Killer Voltage
V
Logic Low Input Voltage
Logic High Input Voltage
Logic Low Input Current
Logic High Input Voltage
Logic Low Output Voltage
Minimum Horizontal Frequency
Maximum Horizontal Frequency
Horizontal Flyback Input
Peak Current during Flyback
Horizontal Flyback Input Current
Peak Current during Scan
I
H-Blank Time Delay - On
H-Blank Time Delay - Off
Maximum Video Blanking Level
Free Run H Frequency, Including
H Blank
Minimum Clamp Pulse Width
Maximum Low Level Clamp
Pulse Voltage
IN
Ref
H-Blank Detection Threshold
Output Voltage (pin 2)
CC
A
A
= 25˚C, V
= 25˚C, V
Parameter
Parameter
CC
CC
= +5.0V, V
= +5.0V, V
IN
IN
Register Value = 0x00
Register Value = 0xFF,
DCF[1:0] = 00b
Register Value = 0xFF,
DCF[1:0] = 01b
0
V
register set to mid-range (0x7F)
Vertical Blanking triggered
Table 17. LM1246 Four-Color
Attribute Registers, V
Activate
SDA or SCL, Input Voltage = 0.4V
SDA or SCL, Input Voltage = 4.5V
I
PLL & OSD Functioning; PPL = 0
PLL & OSD Functioning; PPL = 4
Current Absolute Maximum during
Flyback
Design Value
Absolute Maximum during Scan
Not exact - Duty Cycle Dependent
+ Zero crossing of I
output blanking start. I
− Zero crossing of I
output blanking end. I
Test Setting 4, AC input signal
See (Note 15)
Video Clamp Functioning
O
CC
= 0.7V, V
= 0.7V, V
<
= 3 mA
T
varied from 4.75V to 5.25V, DAC
<
70˚C ambient
5
ABL
ABL
Conditions
Conditions
= V
= V
CC
CC
HFB
HFB
CC
, C
, C
24
24
to 50% of
to 50% of
= −100µA
L
L
Adjusted to
= +1.5mA
= 8 pF, Video Outputs = 2.0 V
= 8 pF, Video Outputs = 2.0 V
−700
1.85
−1.0
1.25
−0.5
Min
Min
200
3.7
2.0
3.4
3.0
0
−550
2.35
±
±
1.45
Typ
Typ
±
±
110
0.5
4.2
3.9
0.5
50
25
45
85
42
0.5
5
0.5
4
0
10
10
P-P
P-P
. See (Note 7)
. See (Note 7)
V
Max
Max
1.65
0.25
0.7
1.0
4.3
1.5
CC
0.5
2.0
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5
+
mV/˚C
Units
Units
LSB
kHz
kHz
kHz
mV
mA
mA
mA
µA
µA
µA
µA
µA
ns
ns
ns
%
V
V
V
V
V
V
V
V
V
V
V