Power Supplies; Figure 5-1. Power Supplies, Regulators, And Indicators - Texas Instruments ADS8688EVM-PDK User Manual

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5 Power Supplies

The PHI provides multiple power-supply options for the EVM, derived from the USB supply of the computer. The
EEPROM on the ADS8688EVM uses a 3.3-V power supply generated directly by the PHI. The EVM_REG_5V5
is a 5.5V supply from the PHI and is applied to the input of a low dropout regulator (LDO) to generate AVDD
on the EVM. The analog supply of the ADC (AVDD = 5.0V) is powered by the TPS7A4700RGWR (U3). The
ADC Digital supply (DVDD = 3.3V), is generated by the PHI. Two LEDs are connected to the AVDD, and DVDD
supplies. These LEDs will illuminate after the software GUI loads and the PHI turns on its output power supplies.
GND
AVDD
GND
SBAU230C – AUGUST 2014 – REVISED MARCH 2021
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AVDD DVDD
R2 R3
DVDD
6.65k 6.65k
D2 D1
APT2012LZGCK APT2012LZGCK
Green Green
GND GND

Figure 5-1. Power Supplies, Regulators, and Indicators

Copyright © 2021 Texas Instruments Incorporated
5.5V
U3
15
IN
C1
16
IN
25V
R1
22uF
13
EN
100k
GND
4
6P4V2
5
6P4V1
6
3P2V
8
1P6V
9
0P8V
10
0P4V
11
0P2V
12
0P1V
R4 R5
TPS7A4700RGWR
0 0
GND
Power Supplies
AVDD
1
OUT
C2
20
OUT
25V
10uF
3
SENSE
GND
14
NR
19
NC
18
NC
C3
17
NC
1µF
2
NC
25V
7
GND
21
PAD
GND
ADS8688EVM-PDK Evaluation Module 7