ADC34RF72 datasheet(64/74 Pages) TI2

64 / 74 page

8.4 Initialization Set Up

After power-up, the internal registers must be initialized to the default values through a hardware reset by

applying a low pulse on the RESET pin, as shown in Figure 8-10. Any given power rail needs to reach 90% of

the value before starting the next power rail.

1. Apply 0.9V DVDD09 digital power supply

2. Apply 1.2V AVDD12 and CLKVDD12 power supplies

3. Apply 1.8V power supplies (AVDD18, GPIOVDD18, DVDD18), in no specific order

4. Apply sampling clock

5. Apply hardware reset. After hardware reset is released, the default registers are loaded from internal fuses.

6. Start programming the internal registers using the SPI register writes. The internal calibration starts

automatically and a register can be read back to check the status of the calibration.

For power down, the inverse sequence can be followed.

AVDD18

CLKVDD18

GPIOVDD18

RESET

SEN

AVDD12

CLKVDD12

DVDD09

CLK

Figure 8-10. Initialization of Serial Registers After Power-Up

Table 8-3. Power Up Timing

MIN

TYP

MAX

UNIT

Power-on delay: delay from power up to active low RESET pulse

Reset pulse width: active low RESET pulse width

100

ADC32RF72

SBASAL2 – NOVEMBER 2025

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ADC34RF72 Datasheet(PDF) 64 Page - Texas Instruments