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ZL40167 数据表(PDF) 3 Page - Zarlink Semiconductor Inc

部件名 ZL40167
功能描述  High Output Current High Speed Dual Operational Amplifier
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制造商  ZARLINK [Zarlink Semiconductor Inc]
网页  http://www.zarlink.com
标志 ZARLINK - Zarlink Semiconductor Inc

ZL40167 数据表(HTML) 3 Page - Zarlink Semiconductor Inc

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ZL40167
Data Sheet
3
Zarlink Semiconductor Inc.
Figure 3 - A Non-Inverting Feedback Amplifier Example
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 ZL40167 (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
Rf
Rg
110R
50R
50R
510R
510R
510R
510R
510R
Twisted Pair
Output
Composite Video
Co-Ax Input
IC1(a)
IC1(b)


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