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参数资料
| 型号： | NTE7138 |
| 厂商： | NTE Electronics, Inc. |
| 英文描述： | Integrated Circuit Advanced Monitor Video Controller for OSD |
| 中文描述： | 集成电路高级监视器视频控制器OSD |
| 文件页数： | 5/7页 |
| 文件大小： | 54K |
| 代理商： | NTE7138 |
Notes to the Characteristics (Cont
’
d):
Note 8.
G
track
= 20 x maximum of
A
x
: signal output amplitude in channel x at any contrast sertting between 1 and 6V.
A
x0
: signal output amplitude in channel x at nominal contrast and same gain setting.
Note 9. Typical step in contrast voltage and response at signal outputs for nominal input signal
V
i(b
–
w)
= 0.7V (OSD fast blanking input/output).
Note10. Linear control range is 1 to 6V for V
i(GC)
, independent of supply voltage.
Note11. The internal reference voltage can be measured at Pin18, Pin15 and Pin12 (channel feed-
back inputs) during output clamping (V
i(HBL)
= 2V) in closed feedback loop.
Note12. Slow variations of video supply V
CRT
will be suppressed at CRT cathode by cut
–
off stabiliza-
tion. Change of V
CRT
by 5V leads to specified cghange of cut
–
off voltage.
Note13. The test mode allows testing without input and output clamping pulses. The signal inputs
have to be biased via resistors to the previously measured clamp voltages of approximately
3V (artificial black level + V
BE
). Signal and brightness blanking is not possible during test
mode. The current outputs should be adjusted by resistors >> R
0
from voltage outputs to a
positive voltage (e.g. V
P
).
Note14. The signal
–
to
–
noise ratio is calculated by the formula (frequency range 1 to 70MHz):
peak
–
to
–
peak value of the nominal signal output voltage
RMS value of the noise output voltage
N
A
30
A
3
dB
A
1
A
10
xA
20
A
2
log
;
A
1
A
10
xA
30
A
3
log
;
A
2
A
20
x
log
= 20 x log
S
dB
Note15. Large output swing e.g. I
o(b
–
w)
= 50mA leads to signal
–
dependent power dissipation in output
transistors. Thermal V
BE
variation is compensated.
Note16. Composite signals will not disturb normal operation because an internal clipping circuit cuts
all signal parts below black level.
Note17. The output current approximately follows the equation I
o
= V
o
V
o
> V
b(SO)
and with R
O
= external resistor at voltage output to GND. The external RC com-
bination at Pin19, Pin16 and Pin13 (voltage outputs) enables peak currents during tran-
sients.
Note18. Frequency responses, crosstalk aznd pulse response have been measured at voltage out-
puts on a special printed
–
circuit board with 50
line in/out connections and without peaking.
Note19. Crosstalk between any two voltage outputs (e.g. channels 1 and 2).
a)
Input conditions:
one channel (channel1 ) with nominal input signal and minimum
rise time. The inputs of the other channels capacitively coupled to GND (channels 2
and 3). Gain Pin3 and Pin11 open
–
circuit.
b)
Output conditions:
output signal of channel 1 is set by contrast control voltage, to
V
o(b
–
w)
= V
o(VOUT1)
= 0.7V, the rise time should be 5ns. Output signal of channel 2 then
is V
o(b
–
w)
= V
o(VOUT2)
.
c)
Transient crosstalk:
α
ct(tr)
= 20 x log V
o(VOUT2)
d) Crosstalk as a function of frequency has been measured without peaking circuit, with
nominal input signal and nominla settings.
Note20. The internal threshold voltages are derived from a stabilized voltage. The internal pulses are
generated while the input pulses are higher than the thresholds. Voltages less than
–
0.1V
at Pin9 and Pin10 can influence black
–
level control and should be avoided.
Note21. The delay between HBL input pulse (horizontakl blanking) and output signal blanking pulse
and also brightness blanking (
V
bl
), at the voltage outputs, depends on the input rise time
of the HBL pulse. The specified values for t
d(Hblank)
are valid for HBL rise times greater than
100ns only.
Note22. For 75ns/V < t
f(CL)
< 240ns/V, generation of internal input clamping and blanking pulse is not
defined. Pulses not exceeding the threshold of input clamping (typical 3V) will be detected
as blanking pulses.
1
R
O
+
1
2.2k
–
500
μ
A for
V
o(VOUT1)
db
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