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HDMP-1636 Datasheet(PDF) 14 Page - Agilent(Hewlett-Packard) |
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HDMP-1636 Datasheet(HTML) 14 Page - Agilent(Hewlett-Packard) |
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14 / 15 page  724 RXCAP0 VCC_RXTTL VCC_RXTTL TOP VIEW GND_RXTTL GND_TXTTL VCC_TXTTL VCC_TXTTL GND_TXTTL GND_TXA TXCAP1 * SUPPLY VOLTAGE INTO VCC_RXA AND VCC_TXA SHOULD BE FROM A LOW NOISE SOURCE. ALL BYPASS CAPACITORS AND PLL FILTER CAPACITORS ARE 0.1 µF. VCC VCC* VCC GND_RXTTL CPLLT VCC* CPLLR Figure 12. Power Supply Bypass. Start-up Procedure: The transceiver start-up procedure(s) use the following conditions: VCC = +3.3 V ± 5% and REFCLK = 125 MHz ± 100 ppm. After the above conditions have been met, apply valid data using a balanced code such as 8B/10B. Frequency lock occurs within 500 µs. After frequency lock, phase lock occurs within 2500 bit times. Transceiver Power Supply Bypass and Loop Filter Capacitors Bypass capacitors should be liberally used and placed as close as possible to the appropriate power supply pins of the HDMP-1636/46 as shown on the schematic of Figure 12. All bypass chip capacitors are 0.1 µF. The VCC_RXA and VCC_TXA pins are the analog power supply pins for the PLL sections. The voltage into these pins should be clean with minimum noise. The PLL loop filter capacitors and their pin locations are also shown on Figure 12. Notice that only two capacitors are required: CPLLT for the transmitter and CPLLR for the receiver. Nominal capacitance is 0.1 µF. The voltage across the capacitors is on the order of 1 volt, so the capacitor can be a low voltage type and physically small. The PLL capacitors are placed physically close to the appropriate pins on the HDMP- 1636/46. Keeping the lines short will prevent them from picking up stray noise from surrounding lines or components. PRE-RELEASE PRODUCT DISCLAIMER: This product is in development at the Hewlett-Packard CSSD in San Jose, California. Until Hewlett- Packard releases this product for general sales, HP reserves the right to alter specifications, features, capabilities, functions, manufacturing release dates, and even general availability of the product at any time. |
Similar Part No. - HDMP-1636 |
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Similar Description - HDMP-1636 |
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