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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.
HVDD
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.
that power is applied.
HVDD
R43
20.0k
GND
HVDD
D1
15V
GND
SBAU193E – JUNE 2011 – REVISED MAY 2021
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15
16
R114
13
100k
C62
22uF
4
5
6
GND
8
9
10
11
12
R115
R116
0
0
GND
Figure 4-1. Low Dropout Regulator for AVDD (5v Supply)
Figure 4-2
also shows how each supply has an LED monitor for quick verification
HVSS
AVDD
R44
R117
20.0k
6.65k
D3
D4
D6
Green
Green
Green
GND
GND
GND
HVSS
HVDD
HVSS
D2
15V
J9
GND
Figure 4-2. Supply Connections and Led Monitors
Copyright © 2021 Texas Instruments Incorporated
U8
AVDD
1
IN
OUT
20
IN
OUT
3
EN
SENSE
14
NR
6P4V2
C64
19
6P4V1
NC
18
1uF
GND
3P2V
NC
17
1P6V
NC
2
0P8V
NC
GND
0P4V
7
0P2V
GND
21
0P1V
PAD
TPS7A4700RGWR
GND
DVDD
DVDD
R118
6.65k
C61
10uF
D7
Green
GND
GND
Power Supplies
TP3
AVDD
C63
10uF
DVDD
TP1
R113
5.11
D5
5V
GND
ADS8568EVM-PDK Evaluation Module
9
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