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HFCT-5942TL Datasheet(PDF) 3 Page - Agilent(Hewlett-Packard) |
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HFCT-5942TL Datasheet(HTML) 3 Page - Agilent(Hewlett-Packard) |
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3 / 19 page  2 Functional Description Receiver Section Design The receiver section for the HFCT-5942xxx contains an InGaAs/InP photo detector and a preamplifier mounted in an optical subassembly. This optical subassembly is coupled to a postamp/decision circuit on a circuit board. The design of the optical assembly is such that it provides better than 27 dB Optical Return Loss (ORL). The postamplifier is ac coupled to the preamplifier as illustrated in Figure 1. The coupling capacitors are large enough to pass the SONET/ SDH test pattern at 2488 Mb/s without significant distortion or performance penalty. If a lower signal rate, or a code which has significantly more low frequency content is used, sensitivity, jitter and pulse distortion could be degraded. Figure 1 also shows a filter function which limits the bandwidth of the preamp output signal. The filter is designed to bandlimit the preamp output noise and thus improve the receiver sensitivity. These components will reduce the sensitivity of the receiver as the signal bit rate is increased above 2488 Mb/s. As an optional feature the device also incorporates a photodetector bias circuit. The circuit works by providing a mirrored output of the bias current within the photodiode. This output must be connected to VCC and can be monitored by connecting through a series resistor (see Application Section). Figure 1. Receiver Block Diagram Noise Immunity The receiver includes internal circuit components to filter power supply noise. However under some conditions of EMI and power supply noise, external power supply filtering may be necessary (see Application Section). 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. The SD output is low voltage TTL. TRANS- IMPEDANCE PRE- AMPLIFIER FILTER GND AMPLIFIER PECL OUTPUT BUFFER TTL OUTPUT BUFFER DATA OUT SIGNAL DETECT CIRCUIT SD DATA OUT PHOTODETECTOR BIAS |
Similar Part No. - HFCT-5942TL |
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Similar Description - HFCT-5942TL |
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