Texas Instruments ADS8568EVM-PDK, User Manual, Page: 9 / 35

4 Power Supplies
The ADS8568EVM has four power supplies: AVDD (5 V), DVDD (3.3 V), HVDD (15 V), and HVSS (-15 V).
The two high voltage power supplies require an external ±15 V supply and are connected on a screw terminal
strip (J9). The lower voltage supplies (AVDD and DVDD), are generated with the USB power and low dropout
regulators (LDO).
4.1 Low Dropout Regulator
U8 is a low dropout regulator (LDO) used to convert the 5.5 V regulated supply from the PHI to a low noise 5 V
supply. The input and output of this LDO can be monitored on TP2 and TP3.
AVDD
GND
GND
OUT
1
NC
2
SENSE
3
6P4V2
4
6P4V1
5
3P2V
6
GND
7
1P6V
8
0P8V
9
0P4V
10
0P2V
11
0P1V
12
EN
13
NR
14
IN
15
IN
16
NC
17
NC
18
NC
19
OUT
20
PAD
21
TPS7A4700RGWR
U8
1uF
C64
GND
TP3
AVDD
GND
100k
R114
GND
10uF
C63
22uF
C62
0
R115
0
R116
HVDD
Figure 4-1. Low Dropout Regulator for AVDD (5v Supply)
4.2 Power Connections and LED Indicators
The screw terminal block J9 is used to connect the external high voltage supplies. These supplies are not
provided in the evaluation module kit and it is expected that you will use low noise lab supply to provide this
power (for example, Keysight E3632a). The high voltage supplies have transient voltage suppressor diodes to
help protect the ADC from transients. These supplies are typically connected to +/-15 V. For details on operation,
see the ADS8568 data sheet.
Figure 4-2 also shows how each supply has an LED monitor for quick verification
that power is applied.
Green
1
2
D6
6.65k
R117
GND
AV DD
Green
1
2
D7
6.65k
R118
GND
DVDD
5.11 R113
GND
DVDD
TP1
GND
5V
D5
DVDD
10uF
C61
1 2 3
J9
HVDD HVS S
GND
H
V
S
S
H
V
D
D
G
N
D
15V
D1
Green
1
2
D3
GND
Green
1
2
D4
GND
HVDD HVS S
15V
D2
HVDD
HVS S
GND
GND
20.0k
R43
20.0k
R44
Figure 4-2. Supply Connections and Led Monitors
www.ti.com Power Supplies
SBAU193E – JUNE 2011 – REVISED MAY 2021
Submit Document Feedback
ADS8568EVM-PDK Evaluation Module 9
Copyright © 2021 Texas Instruments Incorporated