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ZL40166 Fiches technique(PDF) 4 Page - Zarlink Semiconductor Inc

No de pièce ZL40166
Description  High Output Current High Speed Dual Operational Amplifier
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Fabricant  ZARLINK [Zarlink Semiconductor Inc]
Site Internet  http://www.zarlink.com
Logo ZARLINK - Zarlink Semiconductor Inc

ZL40166 Fiches technique(HTML) 4 Page - Zarlink Semiconductor Inc

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Data Sheet
ZL40166
3
Zarlink Semiconductor Inc.
Video transmitter and receiver for twisted wire pair.
Composite video signals can be transmitted down twisted pair cable, i.e. Ethernet (CAT 5), using a differential
transmitter and receiver. The transmitter must be able to drive high currents into the low impedance twisted pair
cable. For video, the amplifiers require flat gain and low phase-shift over the video signal band. To ensure this, the
amplifiers will have 3dB bandwidths well in excess of this. The ZL40166 (dual amplifier) has all of these attributes.
With reference to the differential video driver shown in Figure , the input coax is assumed to have a characteristic
impedance of 75 Ohms, this is terminated with a parallel combination of 110 Ohms and the input impedance of
amplifier IC1 (b) of 255 Ohms, giving 77 Ohms. Low values of feedback resistors are used around the op-amps to
reduce phase-shift due to parasitic capacitors and to minimise the addition of noise.
Baseband PAL or NTSC video signals generally have an amplitude of 2V pk-pk. A gain of two is used to ensure that
the signal level at the end of the (terminated with 100 Ohms) differential pair will be the same as the input level,
neglecting any losses due to the use of long cable lengths.
Figure 4 - Differential Video Driver
The differential receiver is shown in Figure 5 has a 100 Ohm line termination resistor, followed by a differential
amplifier. Long cables will tend to attenuate the signal with greater losses at the higher frequencies, so the second
amplifier is used to equalise these losses. Initially the amplifier should be built without fitting components R1 and
C1. Select the value of R2 to give the required gain at low frequency. Adjust the values of R1 and C1 to correct for
the frequency dependant attenuation of the cable.
To drive a coax cable the output of the amplifier is connected via a series matching 75 Ohm resistor, again this
second (dual amplifier) ZL40166 provides the required power output for the restored 2Vpk-pk video signal.
Figure 5 - Differential Video Receiver
110R
50R
50R
510R
510R
510R
510R
510R
Twisted Pair
Output
Composite Video
Co-Ax Input
IC1(a)
IC1(b)
510R
510R
510R
510R
100R
R2
510R
75R
R1
C1
Composite Video
Co-Ax Output
Twisted Pair
Input
IC2(a)
IC2(b)


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