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AFCT-5179AZ Datasheet(PDF) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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AFCT-5179AZ Datasheet(HTML) 3 Page - AVAGO TECHNOLOGIES LIMITED |
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3 / 8 page  3 Functional Description Receiver Section Design The receiver section contains an InGaAs/InP photo detector and a preamplifier within the receptacle, coupled to a postamplifier/decision circuit on a separate circuit board. The postamplifier is ac coupled to the preamplifier as illus- trated in Figure 1. The coupling capacitor is large enough to pass the EFM test pattern at 125 MBd without signifi- cant distortion or performance penalty. Figure 1 also shows a filter network which limits the band- width of the preamp output signal. The filter is designed to bandlimit the preamp output noise and thus improve the receiver sensitivity. These components will also reduce the sensitivity of the receiver as the signal bit rate is increased above 155 MBd. Noise Immunity The receiver includes internal circuit components to filter power supply noise. Under some conditions of EMI and power supply noise, external power supply filtering may be necessary. If receiver sensitivity is found to be degraded by power supply noise, the filter network illustrated in Figure 2 may be used to improve performance. The values of the filter components are general recommendations and may be changed to suit a particular system environ- ment. Shielded inductors are recommended. Figure 1. Receiver Block Diagram Terminating the Outputs The PECL Data outputs of the receiver may be terminated with the standard Thevenin-equivalent 50 ohm to VCC – 2 V termination. Other standard PECL terminating techniques may be used. The two outputs of the receiver should be terminated with identical load circuits to avoid unnecessarily large ac current in VCC. If the outputs are loaded identically the ac current is largely nulled. The Signal Detect output of the receiver is PECL logic and must be loaded if it is to be used. The Signal Detect circuit is much slower than the data path, so the ac noise generated by an asymmetrical load is negligible. Power consumption may be reduced by using a higher than normal load impedance for the Signal Detect output. Transmission line effects are not generally a problem as the switching rate is slow. The Signal Detect Circuit The Signal Detect circuit works by sensing the peak level of the received signal and comparing this level to a reference. Figure 2. Filter Network for Noise Filtering RECEIVER RECEPTACLE TRANS- IMPEDANCE PRE- AMPLIFIER FILTER GND LIMITING AMPLIFIER PECL OUTPUT BUFFER PECL OUTPUT BUFFER DATA OUT SIGNAL DETECT CIRCUIT SD DATA OUT VCC 100 nF 3.3 µH 100 nF 10 µF FILTERED VCCto DATA LINK + |
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