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PCB Design

PCB Design. Preeti Mulage 04/05/2010. Chip Connections. Four Plane PCB Two Power Planes Analog IO VDD, Digital IO VDD and Digital VDD GND Two for routing. Inputs and outputs from the pads are at 2.5V Inputs and outputs from the FPGA are at 2.5V. FPGA Connections. iBOB

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PCB Design

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  1. PCB Design Preeti Mulage 04/05/2010

  2. Chip Connections • Four Plane PCB • Two Power Planes • Analog IO VDD, Digital IO VDD and Digital VDD • GND • Two for routing • Inputs and outputs from the pads are at 2.5V • Inputs and outputs from the FPGA are at 2.5V

  3. FPGA Connections • iBOB • Connections using Z-DOK connector with 40 pins • Small swing differential signals from/to the FPGA – LVDS chips used to convert them to single ended full rail signals to/from the chip

  4. Voltage Regulators – LT3026 • Input Voltage Range: 1.14V to 3.5V • Adjustable Output Range: 0.4V to 2.6V • Output Current: Upto 1.5A • To be used to generate: • Analog IO VDD (2.5V) • Digital IO VDD (2.5V) • VDD (1.2V)

  5. Bias Voltages – Resistor Dividers • Potentiometer : 5 kΩ • Adjustable Output Range : 10mV to 2.5V or can be directly bypassed to ground through the header • To be used to generate: • VB • VBR • IBIAS_R • IBIAS_L

  6. Packaging – CPG06418 • 64 Pin PGA package from Spectrum Semiconductors Bonding Diagram

  7. ZIF Socket – 265-6310-9UA-1902

  8. Components Needed • Voltage Regulators • Capacitors (for the regulator and for de-coupling caps) • Resistors & Potentiometer • Test Points • SMA Connectors • Jumpers • 2x1 Headers • One 40by2 Z-DOK Connector

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