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ZL40167 数据表(PDF) 3 Page - Zarlink Semiconductor Inc |
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ZL40167 数据表(HTML) 3 Page - Zarlink Semiconductor Inc |
3 / 32 page 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) |
类似零件编号 - ZL40167 |
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类似说明 - ZL40167 |
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