LM1269 National Semiconductor, LM1269 Datasheet - Page 5

• Manufacturer Part Number: LM1269
• Description: 110 MHz I2C Compatible RGB Video Amplifier System with OSD & DACs
• Manufacturer: National Semiconductor

External Interface Signals Electrical Characteristics
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
Note 5: Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200 pF cap is charged to the specified voltage, then discharged directly into the
IC with no external series resistor (resistance of discharge path must be under 50 ).
Note 6: Typical specifications are specified at +25˚C and represent the most likely parametric norm.
Note 7: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: The supply current specified is the quiescent current for V
the supply current is used by the pre-amp.
Note 9: Linearity Error is the variation in step height of a 16 step staircase input signal waveform with 0.7 V
with each step approximately 100 ns in width.
Note 10: Input from signal generator: t
generator response have been removed from the output rise and fall times.
Note 11:
gain change between any two amplifiers with the contrast set to A
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 A
10.0 dB with a tracking change of
Note 12: ABL should provide smooth decrease in gain over the operational range of 0 dB to –6 dB
Beyond –6 dB the gain characteristics, linearity, pulse response, and/or behavior may depart from normal values.
Note 13: Adjust input frequency from 10 MHz (A
Note 14: 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
Note 15: A minimum pulse width of 200 ns is guaranteed for a horizontal line of 15 kHz. This limit is guaranteed by design. If a lower line rate is used then a longer
clamp pulse may be required.
Note 16: The video black level is used for this test. OSD amplitude is measured from the video black level to the OSD white level.
Note 17: Limits met by matching the external resistor going to pin 24 to the H Flyback voltage.
A
V
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
±
0.2 dB.
r
, t
f
<
A
1 ns. Scope and generator response used for testing: t
ABL
V
max reference level) to the −3 dB corner frequency (f
= A(V
IN
= 10 MHz for V
ABL
= V
V
CC
resistor.
1
⁄
2
ABL Max Gain
with R
and measured relative to the A
sep 10 MHz
L
=
5
.
. Load resistors are not required and are not used in the test circuit, therefore all
) − A(V
ABL
= V
r
V
= 1.1 ns, t
max condition. For example, at A
ABL Min Gain
−3 dB
P-P
).
f
(Continued)
= 0.9 ns. Using the RSS technique the scope and
level at the input, subdivided into 16 equal steps,
)
V
1
⁄
2
. This yields a typical gain change of
V
max the three amplifiers’
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