JAJSES4A February 2018 – April 2020 ADC08DJ3200
PRODUCTION DATA.
The device requires two different power-supply voltages. 1.9 V DC is required for the VA19 power bus and 1.1 V DC is required for the VA11 and VD11 power buses.
The power-supply voltages must be low noise and provide the needed current to achieve rated device performance.
There are two recommended power supply architectures:
TI WEBENCH® Power Designer can be used to select and design the individual power supply elements needed: see the WEBENCH® Power Designer
Recommended switching regulators for the first stage include the TPS62085, TPS82130, TPS62130A, and similar devices.
Recommended Low Drop-Out (LDO) linear regulators include the TPS7A7200, TPS74401, and similar devices.
For the switcher only approach, the ripple filter must be designed with a notch frequency that aligns with the switching ripple frequency of the DC-DC converter. Make a note of the switching frequency reported from WEBENCH® and design the EMI filter and capacitor combination to have the notch frequency centered as needed. Figure 166 and Figure 167 illustrate the two approaches.
NOTE:
FB = ferrite bead filter.NOTE:
Ripple filter notch frequency to match the fs of the buck converter.NOTE:
FB = ferrite bead filter.