Board Power Up
6
SNAU212 – June 2017
Copyright © 2017, Texas Instruments Incorporated
ADC1xD1x00CVAL Board User’s Guide
Table 4. Non-ECM Pin Control Settings
PIN (BOARD)
LOW
HIGH
FLOATING
ECEB
ECM
Non-ECM
Not valid
TPN
Non-TPM
TPM
Not valid
NDM
1:2 Demux
1:1 NDM
Not valid
DES
Non-DES
DES
Not valid
LSPSM
Normal
Low sampling power saving
Not valid
DDR_PH
0
˚
Mode
90
˚
Mode
Not valid
FSR
See data sheet for details
Not valid
PDQ
Q-channel active
Power-Down Q-channel
Not valid
PDI
I-channel active
Power-Down I-channel
Not valid
VBG
N/A
Higher LVDS common-mode
voltage
Lower LVDS common-mode voltage
5
Board Power Up
Refer to the individual product data sheets for information about the absolute maximum ratings and
recommend operating conditions.
5.1
Power Supply
For flexibility, each of the different ADC power supply pins has been brought out to a red PWR terminal. TI
recommends powering all supply pins from a single power-supply source. The supply voltage to any of the
PWR terminals must not exceed that applied to X-1 PWR (VA). The supply voltage is a nominal 1.9 V and
should not exceed 2 V.
5.2
Power-Up Sequence
The ADC should be powered up in Non-ECM, by putting the ECEB pin high. The ADC does not have a
Power-on-Reset. If the part is started in extended control mode (ECM), by having the ECEB pin low, the
registers will come up in an unknown random state, and the part will be in an unknown operating
condition. If ECM mode is desired, the board can be placed in ECM by moving the ECEB pin low after
power up with the ECEB pin high.
After the board has stabilized, the ADC should be calibrated by flipping the red CAL switch from low
(CALb) to high (CAL). If the switch remains high, the part cannot be recalibrated in ECM. To enable the
part to be recalibrated, in either ECM or with the switch, the CAL switch must be low (CALb). Recalibrate
the part when there has been a major change in operating conditions, such as change in Fclk, or
temperature.
5.3
VBG Pin
Some versions of this universal board allow for the option to put the VBG pin low. This not a supported
state, and the VBG pin should not be taken low.
