Power Supplies - Texas Instruments ADS1263EVM-PDK User Manual

Power Supplies

5 Power Supplies
The default ADC power-supply voltages (DVDD and AVDD) are generated by the PHI controller using power
from the USB. The PHI provides 3.3-V and 5.5-V power rails. The 3.3-V power rail directly supplies the ADC
DVDD voltage. The 5.5-V power rail is supplied to the input of the TPS7A4700, a low-noise, configurable-output
LDO, to supply AVDD. The LDO output voltage depends on the internal reference voltage (V
and the pin connections. Grounding any LDO pin between pin 4 through pin 12 adds that pin voltage to V
and increases the LDO output voltage, LDO
pin 10 (3P2V and 0P4V, respectively) to set LDO
Remove shunt to apply
external LDO source to JP-2
JP2
EVM_REG_5V5
TP4
R38
C26 100k
10uF
R29
10.0k
GND
R32
D1
Green
R35
GND
GND
Figure 5-1. ADS1263EVM LDO Circuit and External Power Source Connections
Figure 5-1 also shows that the 5V_LDO output is used for the AVDD connections across the EVM. Additionally,
the user can measure the AVDD current by connecting an ammeter between pins 1 and 2 of JP1 or the DVDD
current by connecting an ammeter between pins 1 and 2 of JP3.
External power sources can also be provided for each supply voltage:
• LDO: Remove the shunt on JP2 and connect external power to JP2:2
• AVDD: Remove the shunt on JP3 and connect external power to JP3:2
• DVDD: Remove the shunt on JP1 and connect external power to JP1:2
When using either internal or external power supplies, LEDs D2 and D3 indicate if power is connected to AVDD
and DVDD, respectively. These LEDs do not necessarily indicate if AVDD is 5 V or if DVDD is 3.3 V. Check the
AVDD voltage using terminal JP6:1 and check the DVDD voltage using test point TP9.
portion of the schematic that includes the AVDD and DVDD LEDs.
Figure 5-2. ADS1263EVM AVDD and DVDD Indicator LEDs and Shunts
18 ADS1263EVM-PDK Evaluation Module
. Figure 5-1
VOUT
VOUT
5-V Analog LDO
U3
15
IN OUT
16
IN OUT
13
EN SENSE/FB
12
0P1V
11
0P2V
0
10
0P4V
9
0P8V
8
1P6V NC
0
6
3P2V NC
5
6P4V1 NC
4
6P4V2 NC
GND
14
NR Thermal_Pad
TPS7A4700RGWR
C27
1uF
GND
AVDD
R28
6.65k
D2
Green
GND
Copyright © 2023 Texas Instruments Incorporated
shows that the ADS1263EVM grounds pin 6 and
to 5 V.
5V_LDO
1
TP5
20
R39
3
0.1
C28
22µF
2
17
18
19
GND
7
21
GND
DVDD
R30
6.65k
D3
Green
GND
SBAU206B – APRIL 2015 – REVISED MAY 2023
www.ti.com
) of 1.4 V
LDO_REF
LDO_REF
EVM/PHI Power
5V_LDO AVDD
Remove shunt to apply
external AVDD source to
JP3-2
JP3
3.3V_EVM DVDD
DVDD
TP9
To apply external DVDD
remove shunt apply to
JP1-2
JP1
Figure 5-2 shows the
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