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PDF NTE7138 Data sheet ( Hoja de datos )
| Número de pieza | NTE7138 | |
| Descripción | Integrated Circuit Advanced Monitor Video Controller for OSD | |
| Fabricantes | NTE Electronics | |
| Logotipo |  |
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NTE7138
Integrated Circuit
Advanced Monitor Video Controller for OSD
Description:
The NTE7138 is an RGB pre–amplifier in a 20–Lead DIP type package designed for color monitor
systems with super VGA performance. It is intended for DC or AC coupling of the color signals to the
cathodes of a CRT.
Features:
D 85MHz Video Controller
D Fully DC Controllable
D 3 Separate Video Channels
D Input Black Level Clamping
D White Level Adjustment for 2 Channels Only
D Brightness Control with Correct Grey Scale Tracking
D Contrast Control for All 3 Channels Simultaneously
D Cathode Feedback to Internal Reference for Cut–Off Control, Which Allows Unstabilized Video
Supply Voltage
D Current Outputs for RGB Signal Currents
D RGB Voltage Outputs to External Peaking Circuits
D Blanking and Switch–Off Input for Screen Protection
D Sync On Green Operation Possible
D On Screen Display (OSD) Facility
Absolute Maximum Ratings:
Supply Voltage (Pin7), VP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +8.8V
Input Voltage Range (Pin2, Pin5, Pin8), Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.1 to VP
External DC Voltage Ranges, Vext
Pin20, Pin17, Pin14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.1 to VP
Pin12, Pin15, Pin18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.1 to +0.7V
Pin1, Pin3, Pin6, Pin11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.1 to VP
Pin9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.1 to VP+0.7V
Pin10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.1 to VP+0.7V
Average Output Current (Pin14, Pin17, Pin20, Note 1), Io(av) . . . . . . . . . . . . . . . . . . . . . . . 0 to 50mA
Peak Output Current (Pin14, Pin17, Pin20), IOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 100mA
Total Power Dissipation, Ptot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200mW
Electrostatic Handling for All Pins (Note 2), Vesd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±500V
Operating Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25° to +150°C
Operating Ambient Temperatrure Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25° to +150°C
Thermal Resistance, Junction–to–Ambient (In Free Air), RthJA . . . . . . . . . . . . . . . . . . . . . . . . 65K/W
Note 1. Signal amplitude of 50mA black–to–white is possible if the average current (including blank-
ing times and signal variation against time) does not exceed 50mA. The maximum power
dissipation of 1200mW has to be considered.
Note 2. Equivalent to discharging a 200pF capacitor through a 0Ω series resistor.
1 page  
Notes to the Characteristics (Cont’d):
Note 8. ∆Gtrack = 20 x maximum of
log
A1
A10
x
A20
A2
; log
A1
A10
x
A30
A3
; log
A2
A20
x
A30
A3
dB
Ax: signal output amplitude in channel x at any contrast sertting between 1 and 6V.
Ax0: 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
Vi(b–w) = 0.7V (OSD fast blanking input/output).
Note10. Linear control range is 1 to 6V for Vi(GC), independent of supply voltage.
Note 11. The internal reference voltage can be measured at Pin18, Pin15 and Pin12 (channel feed-
back inputs) during output clamping (Vi(HBL) = 2V) in closed feedback loop.
Note12. Slow variations of video supply VCRT will be suppressed at CRT cathode by cut–off stabiliza-
tion. Change of VCRT 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 + VBE). Signal and brightness blanking is not possible during test
mode. The current outputs should be adjusted by resistors >> R0 from voltage outputs to a
positive voltage (e.g. VP).
Note14. The signal–to–noise ratio is calculated by the formula (frequency range 1 to 70MHz):
S
N
= 20 x log
peak–to–peak value of the nominal signal output voltage
RMS value of the noise output voltage
dB
Note15. Large output swing e.g. Io(b–w) = 50mA leads to signal–dependent power dissipation in output
transistors. Thermal VBE 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 Io = Vo
1
RO
+
1
2.2kΩ
–500µA for
Vo > Vb(SO) and with RO = 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 50Ω 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
Vo(b–w) = Vo(VOUT1) = 0.7V, the rise time should be 5ns. Output signal of channel 2 then
is Vo(b–w) = Vo(VOUT2).
c) Transient crosstalk: αct(tr) = 20 x log
Vo(VOUT2)
Vo(VOUT1)
db
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 (∆Vbl), at the voltage outputs, depends on the input rise time
of the HBL pulse. The specified values for td(Hblank) are valid for HBL rise times greater than
100ns only.
Note22. For 75ns/V < tf(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.
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet NTE7138.PDF ] | |
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