Datasheet

LMH1251
www.ti.com SNLS193J –AUGUST 2005–REVISED MARCH 2013
Video Signal Electrical Characteristics (continued)
Unless otherwise noted: T
A
= 25°C, V
CC
= +5.0V, RGB Video
IN
= 0.7 V
PP
, Y Video
IN
= 0.7 V
PP
, P
B
P
R
Video
IN
= ±350 mV,
C
L
= 8 pF, Video Outputs = 0.7 V
PP
.
Symbol Parameter Conditions Min
(1)
Typ
(2)
Max
(1)
Units
Video Frequency Domain Response
RGB BW RGB Input: Large Signal BW 400 MHz
Channel Bandwidth (−3 dB)
YP
B
P
R
BW YP
B
P
R
Input (SD & HD): Large Signal BW 70 MHz
Channel Bandwidth (−3 dB)
V
SEP Ch-Ch
Video Amplifier 10 MHz Isolation
(6)
−50 dB
10 MHz RGB Channel to Channel
V
SEP INPUT-INPUT
Video Amplifier 10 MHz Isolation
(6)
−55 dB
10 MHz RGB Input to YP
B
P
R
Input
SNR Signal to Noise Ratio AC Input Signal, C
L
= 8 pF
(6)
55 dB
(6) Measure output levels of the other two undriven amplifiers relative to the driven amplifier to determine channel separation. Terminate the
undriven amplifier inputs to simulate generator loading. Repeat test at f
IN
= 10 MHz for V
SEP
10 MHz.
Color Conversion Accuracy
Unless otherwise noted: T
A
= 25°C, V
CC
= +5.0V, Y Video
IN
= 0.7 V
PP
, P
B
P
R
Video
IN
= ±350 mV, C
L
= 8 pF,
Video Outputs = 0.7 V
PP
.
Symbol Parameter Conditions Min
(1)
Typ
(2)
Max
(1)
Units
V
COLOR ERROR
|P
B
P
R
| Amplitude YP
B
P
R
Video Input, ±0.3 ±2.5 %
(Calculated from RGB Outputs) 100% Color Bar (any 3 colors),
(3)
θ
COLOR ERROR
P
B
P
R
Phase Angle YP
B
P
R
Video Input, ±0.2 ±1.5 deg
(Calculated from RGB Outputs) 100% Color Bar (any 3 colors),
(3)
(1) Datasheet min/max specification limits are specified by design, test, or statistical analysis. The ensured specifications apply only for the
test conditions listed. Some performance characteristics may change when the device is not operated under the listed test conditions.
(2) Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary
over time and will also depend on the application and configuration. The typical values are not tested and are not ensured on shipped
production material.
(3) Any three color bar signals can be used as test signals. The RGB outputs shall be used to calculate the amplitudes and phases of the
chroma results. These should fall within the limits specified.
Sync Signal Electrical Characteristics
Unless otherwise noted: T
A
= 25°C, V
CC
= +5.0V, Y Video
IN
= 0.7 V
PP
, P
B
P
R
Video
IN
= ±350 mV, C
L
= 8 pF,
Video Outputs = 0.7 V
PP
.
Symbol Parameter Conditions Min
(1)
Typ
(2)
Max
(1)
Units
V
SYNCL
H & V SYNC Low Input Pins 1 & 2 −0.5 1.5 V
V
SYNCH
H & V SYNC High Input Pins 1 & 2 3.0 V
CC
+0.5 V
I
O-SYNCH
H & V SYNC Current Sink/Source 5 kΩ Load 3 mA
Capability
t
R/F-SYNC
H & V SYNC Rise/Fall Time 15 ns
t
SYNC-WIDTH
H & V SYNC Width Error Relative to H & V SYNC Input 5 %
H & V SYNC Input
t
Y-SYNC-WIDTH
H & V SYNC Width Error Relative to Composite SYNC on Y Input 5 %
Composite SYNCS on Y
t
SYNC-DELAY
50% of H & V SYNC Input to Output H & V SYNC Input 40 ns
t
Y-HSYNC-DELAY
50% of H SYNC Input to Output Composite SYNC on Y Input (Not 70 ns
During Vertical Period)
(1) Datasheet min/max specification limits are specified by design, test, or statistical analysis. The ensured specifications apply only for the
test conditions listed. Some performance characteristics may change when the device is not operated under the listed test conditions.
(2) Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary
over time and will also depend on the application and configuration. The typical values are not tested and are not ensured on shipped
production material.
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