DS90UB929-Q1 Datasheet, PDF (60/71 Pages) Texas Instruments – 720p HDMI to FPD-Link III Bridge Serializer

DS90UB929-Q1
SNLS457 – NOVEMBER 2014
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10 Power Supply Recommendations
This device provides separate power and ground pins for different portions of the circuit. This is done to isolate
switching noise effects between different sections of the circuit. Separate planes on the PCB are typically not
required. The Pin Functions table provides guidance on which circuit blocks are connected to which power pins.
In some cases, an external filter many be used to provide clean power to sensitive circuits such as PLLs.
10.1 Power Up Requirements And PDB Pin
The power supply ramp should be faster than 1.5ms with a monotonic rise. A large capacitor on the PDB pin is
needed to ensure PDB arrives after all the supply pins have settled to the recommended operating voltage.
When PDB pin is pulled up to V_DDIO, a 10kΩ pull-up and a >10μF capacitor to GND are required to delay the
PDB input signal rise. All inputs must not be driven until all power supplies have reached steady state.
The recommended power up sequence is as follows: V_TERM, V_DD18, V_DD11, wait until all supplies have settled,
activate PDB, then apply HDMI input.
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