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PDF AND8094 Data sheet ( Hoja de datos )
| Número de pieza | AND8094 | |
| Descripción | Three New Tiny Switches Facilitate Video Switching | |
| Fabricantes | ON Semiconductor | |
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AND8094/D
Three New Tiny Switches
Facilitate Video Switching
Prepared by: Fred Zlotnick
ON Semiconductor
http://onsemi.com
APPLICATION NOTE
ON Semiconductor has just introduced four switches to
The circuitry couldn’t be simpler. These switches are all
facilitate many switching functions including composite Single Pole Double Throw (SPDT). Essentially the
video switching. One of the issues with today’s consumer common side of the part is connected to the jack center pin,
products is they are getting so small, there is no room for while the signal pins are connected to either the input or the
traditional switches or extra sets of jacks needed for various output of the camera. The resistance of the switch is low
functions. One solution is to permit one set of jacks to enough not to cause much insertion loss or distortion to the
perform two functions, an input and an output. In this waveform. Although this application shows switching a
example, we show a Digital Video Camera with analog composite video signal, the same switch can switch the
input/output requirements. Many consumers require the higher bandwidth component video signals or digital signals
ability to transfer their old analog tapes to digital format, beyond 50 MHz as well. It is assumed that the internal
but this requires analog inputs on the camera. The size of video amplifiers have their own 75 Ω matching resistors
today’s camera is so small that providing both input jacks appropriately placed. The output Video amplifier needs to
and output jacks, requires too much space. One solution is have a series 75 Ω resistor and its dc level is ≅ 2.5 V. The
to have an A/V jack which functions as either input or input is assumed to be 75 Ω with a dc path to ground. Since
output. The onboard MCU can instruct the switchDatotabSeheet4tUh.ecsoemswitches are single supply, the signals passing
either an input or output.
through them need to be between 0 and 5 Volts with white
Any one of the four switches may be used for this level near mid-voltage. The dc blocking capacitor keeps
application, and they are the NLAS4599, the NLAST4599, undesired dc off the input or output.
the NLASB3157, and the NLAS1053. The first two devices
Figure 2 shows the use of these parts as described. Select
are essentially the same, however the “T” version permits pin is connected to an MCU, the inputs and output are
interface to “TTL” level signals, without any additional connected to pins 4, 6 (4599) or 1, 3 (3157) and the jack is
components. The third device is the same function as the either connected to 5 (4599) or 3 (4599). Vcc is assumed to
first two, with a slightly different pin arrangement to meet be +5 V. If a low voltage MCU is used as a controller, the
certain customer requirements. The first two devices are NLAST4599 can be directly interfaced to it, as long as the
available in SOT-23 size 6-pin packages, while all three supply voltage is greater than 2.3 V.
are available in the tiny SC70 footprint, only 2 × 2 mm.
B1 1
6 Select Select 1
1
GND 2
5 VCC
0
V+ 2
B0 3
4A
GND 3
6 NO
5 COM
4 NC
NLASB3157
NLAS4599 or NLAST4599
Input
NLASB3157
NLAST4599
NLAS4599
NLAS1053
Out
Figure 1.
I/O Jack
DataShee
DataSheet4U.com
© Semiconductor Components Industries, LLC, 2003
April, 2003 - Rev. 1
1
RG-59 Cable
Figure 2.
Publication Order Number:
AND8094/D
1 page | ||
| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet AND8094.PDF ] | |
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