LM1267
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 kΩ resistor.
(Continued)
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 50Ω).
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
CC
with R
L
=
∞
. Load resistors are not required and are not used in the test circuit, therefore all
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
P-P
level at the input, subdivided into 16 equal steps,
with each step approximately 100 ns in width.
Note 10:
Input from signal generator: t
r
, t
f
<
1 ns. Scope and generator response used for testing: t
r
= 1.1 ns, t
f
= 0.9 ns. Using the RSS technique the scope and
generator response have been removed from the output rise and fall times.
Note 11:
∆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
gain change between any two amplifiers with the contrast set to A
V
1
⁄
2
and measured relative to the A
V
max condition. For example, at A
V
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 A
V
1
⁄
2
. This yields a typical gain change of
10.0 dB with a tracking change of
±
0.2 dB.
Note 12:
ABL should provide smooth decrease in gain over the operational range of 0 dB to –6 dB
∆A
ABL
= A(V
ABL
= V
ABL Max
Gain
)
− A(V
ABL
= V
ABL Min
Gain
)
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
V
max reference level) to the −3 dB corner frequency (f
−3 dB
).
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
IN
= 10 MHz for V
sep 10 MHz
.
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.
Typical Performance Characteristics
Gain Attenuation
V
CC
= 5V, T
A
= 25˚ unless otherwise specified.
Contrast Attenuation
DS200050-2
DS200050-3
ABL Attenuation
Output Waveform
DS200050-4
DS200050-5
5
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