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LMH1251 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LMH1251
Description  YPBPR to RGB Decoder and 2:1 Video Switch
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 5 page
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Sync Signal Electrical Characteristics (Continued)
Unless otherwise noted: T
A = 25˚C, VCC = +5.0V, Y VideoIN = 0.7 VPP,PBPR VideoIN = ±350 VmV, CL = 8 pF,
Video Outputs = 0.7 V
PP. See (Note 7) for Min and Max parameters and (Note 6) for typicals.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
t
Y-HSYNC-DELAY
50% of H SYNC Input to Output
Composite SYNC on Y Input
(Not During Vertical Period)
70
ns
System Interface Signal Characteristics
Unless otherwise noted:
TA = 25˚C, VCC = +5.0V, Y VideoIN = 0.7 VPP,PBPR VideoIN = ±350 VmV, CL = 8 pF,
Video Outputs = 0.7 V
PP. See (Note 7) for Min and Max parameters and (Note 6) for typicals
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
IL
Logic Low Input Voltage
(Pins 24, 23, 22, 21)
−0.5
1.5
V
V
IH
Logic High Input Voltage
(Pins 24, 23, 22, 21)
3.0
V
CC
+0.5
V
I
L
Logic Low Input Current
(Pins 24, 23, 22, 21)
Input Voltage = 0.4V
±10
µA
I
H
Logic High Input Voltage
(Pins 24, 23, 22, 21)
Input Voltage = 0.4V
±10
µA
V
OL
Logic Low Output Voltage
(Pins 24, 23, 22, 21)
IO=3mA
0.5
V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications, see the Electrical Characteristics tables.
Note 2: Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. All video inputs must be properly
terminated.
Note 3: All voltages are measured with respect to GND, unless otherwise specified.
Note 4: Human Body Model: 100 pF discharged through a 1.5 k
Ω resistor.
Note 5: Input from RGB signal generator: tr,tf = 1.5 ns. Input from SDTV YPBPR signal generator: tr,tf = 15 ns. Input from HDTV YPBPR signal generator: tr,tf = 8 ns.
Note 6: Typical specifications are specified at +25˚C and represent the most likely parametric norm.
Note 7: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. The guaranteed specifications apply only for the test conditions
listed. Some performance characteristics may change when the device is not operated under the listed test conditions.
Note 8: The supply current specified is the quiescent current for VCC and 5V with RL = . Load resistors are not required and are not used in the test circuit;
therefore, all the supply current is used by the device.
Note 9: Linearity Error is the maximum variation in step height of a 16 step staircase input signal waveform with a 0.7 VPP level at the input. All 16 are steps equal,
with each at least 100 ns in duration.
Note 10:
∆AV track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three gain stages. It is the difference in
gain change between any two amplifiers with the contrast set to AVC-50% and measured relative to the AV max condition. For example, at AV max the three
amplifiers’ gains might be 12.1 dB, 11.9 dB, and 11.8 dB and change to 2.2 dB, 1.9 dB and 1.7 dB respectively for contrast set to AVC-50%. This yields a typical gain
change of 10.0 dB with a tracking change of ±0.2 dB.
Note 11: The Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200 pF cap is charged to the specific voltage, then discharged directly into
the IC with no external series resistor (resistance of discharge path must be under 50
Ω).
Note 12: 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 fIN = 10 MHz for VSEP 10 MHz.
Note 13: 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 chrominance results.
These should fall within the limits specified.
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