12ビット、RF サンプリング A/D コンバータ (ADC)" />
JAJSGI4B November 2018 – March 2021 ADC12DJ3200QML-SP
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.
A recommended DC/DC switching regulator for the first stage is the TPS50601A-SP, but other similar devices can be used as well. Recommended LDOs for the second stage include TPS7H1101A-SP, TPS7A4501-SP and other similar devices.
For the switcher only approach, the ripple filter must be designed to provide sufficient filtering at the switching frequency of the DC-DC converter and it's harmonics. WEBENCH® reports the switching frequency when used to design the supply. Each application will have different tolerances for noise on the supply voltage so strict ripple requirements are not provided. Figure 9-1 and Figure 9-2 illustrate the two approaches.