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DS90UB913A-Q1 Datasheet, PDF (35/51 Pages) Texas Instruments – 25-MHz to 100-MHz 10/12-Bit FPD-Link III Serializer
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9 Application and Implementation
DS90UB913A-Q1
SNLS443C – MAY 2013 – REVISED APRIL 2016
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The DS90UB913A was designed as a serializer to support automotive camera designs. Automotive cameras are
often located in remote positions such as bumpers or trunk lids, and a major component of the system cost is the
wiring. For this reason it is desirable to minimize the wiring to the camera. This chipset allows the video data,
along with a bidirectional control channel, and power to all be sent over a single coaxial cable. The chipset is
also able to transmit over STP and is pin-to-pin/backwards compatible with the DS90UB913Q.
9.1.1 Power Over Coax
See application report Sending Power over Coax in DS90UB913A Designs for more details.
9.1.2 Power-Up Requirements and PDB Pin
The PDB pin on the device must be ramped after the VDDIO and VDD_n supplies have reached their required
operating voltage levels. It is recommended to assert PDB = HIGH with an RC filter network to help ensure
proper sequencing of the PDB pin after settling of the power supplies. Please refer to Power Down for device
operation when powered down.
Common applications will tie the VDDIO and VDD_n supplies to the same power source of 1.8V typically. This is an
acceptable method for ramping the VDDIO and VDD_n supplies. The main constraint here is that the VDD_n supply
does not lead in ramping before the VDDIO system supply. This is noted in Figure 27 with the requirement of t1≥ 0.
t0
1.8 V or 3.3 V
VDDIO
GND
t2
1.8V
VDD_n
GND
t1
VDDIO
PDB
GND
Figure 27. Suggested Power-Up Sequencing
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