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PDF NJU71042 Data sheet ( Hoja de datos )
| Número de pieza | NJU71042 | |
| Descripción | OUTPUT COUPLING CAPACITOR-LESS VIDEO AMPLIFIER | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJU71042
OUTPUT COUPLING CAPACITOR-LESS
VIDEO AMPLIFIER WITH COAXIAL COMMUNICATION RECEIVER
GENERAL DESCRIPTION
The NJU71042 is a Low Voltage Video Amplifier with Coaxial
Communication Receiver. By the internal charge pump circuit, output
capacitor is unnecessary.
The NJU71042 features low power and small package, and is
suitable for low power design on downsizing of portable video
system and system with video output.
Moreover, the following voltage gain variations are arranged.
- NJU71041(Gain=6dB)
PACKAGE OUTLINE
NJU71042RB2
NJU71042MJE
MSOP10(TVSP10) **U.D.
FEATURES
Operating Voltage
2.5 to 3.45V
Output coupling capacitor-less
Coaxial Communication Receiver
12dB amplifier
Internal 75 Driver Circuit (2-system drive)
Internal LPF
-1dB at 10MHz typ
CMOS Technology
Package Outline
-40dB at 54MHz typ
MSOP10(TVSP10)*, EQFN12(3.0*3.0mm)**U.D.
*MEET JEDEC MO-187-DA / THIN TYPE
PIN CONFIGURATION
1 10
56
NJU71042RB2
BLOCK DIAGRAM
1: CP1
2: V+
3: VIN
4: UTCREF
5: UTCOUT
6: UTCIN
7: VOUT
8: GND
9: V-
10: CP2
Ver.3
-1-
1 page  
NJU71042
Application Note
The UTC receiver block (UTCIN (pin6), UTCOUT (pin5), UTCREF (pin4))
The NJU71042 can transmit that video signal and camera control signal at one coaxial cable.
The output video signal from the NJU71042 superimposes on a camera control signal (a coaxial data from an
output unit).
The output unit examples are DVR, camera-controller, and so on.
The superimposed signal is inputted to the NJU71042 UTCIN (pin 6). Refer to fig1.
The signal inputted to UTCIN (pin6) is compared to the reference voltage generated by the NJU71042.
After that, it is amplified and outputted the high (V+)/low (0V) signal from UTCOUT (pin5).
(The UTCREF (pin4) can set the threshold voltage of the comparator by the pull-down or the pull up resistor.
Refer to fig3.)
The signal outputted from UTCOUT (pin5) is inputted to a camera control block of CCTV.
As above mentioned, the video signal and the camera control signal can transmit at one coaxial cable.
Therefore, The NJU71042 contributes to the space - saving.
A case of multiple coaxial transmission: UTC(Up The Coaxial)
This is one of a case at the multiplex coaxial transmission used in CCTV.
It is a system that control signals of camera multiplexing to the coaxial cable.
This system is superimposed on the control signal pulse in the vertical blanking period as shown in Figure.
This is because do not affect the video signal.
Case of Coaxitron
18 19
22
1 2 3 4 5 6 7 8 9 10 17 20 21
Horizontal
s ync hroni zati on
peri od
1H
1H
Equalizing pulse period
1H
Vertical synchronization
pulse period
Equalizing pulse period
Figure: A case of UTC
-5-
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet NJU71042.PDF ] | |
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