OSD Electrical Characteristics
(Continued)
See DC Test Circuit (Figure
5),
T
A
= 25藲C; V
CC1
= V
CC2
= 12V; V
13
= 4V; V
14
= 4V; V
16
= 4V; V
Drive
= 4V; V
4
= 4V; V
15
=
0V; V
25
= 1V unless otherwise stated
Symbol
t
f-prop
(OSD)
V
feed
10 kHz
V
feed
10 MHz
Parameter
Ending OSD Propagation Delay
Video Feedthrough into OSD
Video Feedthrough into OSD
Conditions
V
14
= 4V; V
25
= 1V
V
14
= 4V; V
25
= 1V;
V
1
= V
2
= V
3
= 0V
V
14
= 4V; V
25
= 1V;
V
1
= V
2
= V
3
= 0V
Typical
(Note 5)
9
鈭?0
鈭?0
Limit
(Note 6)
Units
ns
dB
dB
Note 1:
Absolute Maximum Rating indicate limits beyond which damage to the device may occur.
Note 2:
Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and
test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may de-
grade when the device is not operated under the listed test conditions.
Note 3:
V
CC
supply pins 6, 9, and 22 must be externally wired together to prevent internal damage during V
CC
power on/off cycles.
Note 4:
Human body model, 100 pF discharged through a 1.5 k鈩?resistor.
Note 5:
Typical specifications are specified at +25藲C and represent the most likely parametric norm.
Note 6:
Tested limits are guaranteed to National鈥檚 AOQL (Average Outgoing Quality Level).
Note 7:
The supply current specified is the quiescent current for V
CC1
and V
CC2
with R
L
=
鈭?/div>
, see
Figure
5鈥檚 test circuit. The supply current for V
CC2
(pin 22) also
depends on the output load. With video output at 1V DC, the additional current through V
CC2
is 8 mA for
Figure 5鈥檚
test circuit.
Note 8:
Output voltage is dependent on load resistor. Test circuit uses R
L
= 390鈩?
Note 9:
Measure gain difference between any two amplifiers. V
IN
= 635 mV
PP
.
Note 10:
鈭咥
V
track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three attenuators. It is the difference in
gain change between any two amplifiers with the contrast voltage (V
13
) at either 4V or 2V measured relative to an A
V
max condition, V
13
= 4V. For example, at A
V
max the three amplifiers鈥?gains might be 17.1 dB, 16.9 dB, and 16.8 dB and change to 11.2 dB, 10.9 dB and 10.7 dB respectively for V
13
= 2V. This yields the mea-
sured typical
鹵
0.1 dB channel tracking.
Note 11:
When measuring video amplifier bandwidth or pulse rise and fall times, a double sided full ground plane printed circuit board without socket is recom-
mended. Video amplifier 10 MHz isolation test also requires this printed circuit board. The reason for a double sided full ground plane PCB is that large measurement
variations occur in single sided PCBs.
Note 12:
Adjust input frequency from 10 MHz (A
V
max reference level) to the 鈭? dB corner frequency (f
鈭? dB
).
Note 13:
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 14:
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 a longer clamp
pulse may be required.
Note 15:
During the AC test the 4V DC level is the center voltage of the AC output signal. For example, if the output is 4 V
PP
the signal will swing between 2V DC
and 6V DC.
Note 16:
When V
1
= V
2
= V
3
= 0V and the video input is 0.7V, then t
r
(OSD) = 11 ns and t
f
(OSD) = 4 ns. The Video Output waveform will be inverted from the one
shown in
Figure 3.
Thus t
r
(OSD) is actually a fall time and t
f
(OSD) is actually a rise time in this condition.
Note 17:
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 (resistor of discharge path must be under 50鈩?.
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