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VSC7969WD2B Datasheet(PDF) 9 Page - Vitesse Semiconductor Corporation |
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VSC7969WD2B Datasheet(HTML) 9 Page - Vitesse Semiconductor Corporation |
9 / 14 page VITESSE SEMICONDUCTOR CORPORATION Advance Product Information VSC7969 3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect G52355-0, Rev 2.0 Page 9 02/09/01 © VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012 Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com Internet: www.vitesse.com Signal Detect The signal detect feature of the VSC7969 provides a CMOS level output corresponding to the input current level to the transimpedance amplifier. The assert and deassert levels of the signal detect pin can be adjusted by placing an optional resistor from SD_ADJ to ground. The following tables show the two extremes at which the signal detect pin will operate; open circuit and short-ciruit to ground. Table 5: Signal Detect Function, SD_ADJ Open With SD_ADJ (pin 16) shorted to ground, thresholds are 3dB higher, as shown in Table 6. Table 6: Signal Detect Function, SD_ADJ Shorted to Ground Photodetector Current Monitor The IMON pin provides a linear measurement of the average input current from the photodetector to the transimpedance amplifier. For example, if 20µA is the average input current to the transimpedance amplifier, the current through the IMON pin will be 20µA (see the typical operating curve “IMON Characteristic, 0µA to 200µA). To use this feature, connect the IMON pin to VCC using a resistor less than 2kΩ. If this feature is not used, the IMON pin can be left unconnected. Electrical Min Typ Max Units Assert 3 5 9 µA Deassert 1 2.2 3 µA Hysteresis 1 2 4 dB Electrical Min Typ Max Units Assert 6 10 18 µA Deassert 2 4.4 6 µA Hysteresis 1 2 4 dB |
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