Power Supplies; External Power Connections And Test Points; Low-Dropout Regulator (Tps7A3001 For Hvss) - Texas Instruments ADS8555EVM-PDK User Manual

Power Supplies

4 Power Supplies
The ADS8555 device uses four power supplies: AVDD (5 V), BVDD (3.3 V), HVDD (12 V), and HVSS (–12 V).
The two high-voltage power supplies require an external ±15-V supply and are connected on a screw terminal
strip (J1). The ±15-V supplies are regulated from ±15 V to ±12 V for HVDD and HVSS. The digital voltage supply
(BVDD), is generated with the USB power. The analog supply (AVDD) is generated using the external 15-V
supply and an LDO to generate 5 V.

4.1 External Power Connections and Test Points

The screw terminal block J1 is used to connect the external high voltage supplies. These supplies are not
provided in the evaluation module kit and the expectation is that a low-noise lab supply is used to provide this
power (for example, Keysight
help protect the ADC from transients. These supplies are typically connected to ±15 V. For details on operation,
see the ADS8555 data sheet.
for quick verification that power is applied.

4.2 Low-Dropout Regulator (TPS7A3001 for HVSS)

As shown in Figure 4-2, the –15-V external power is connected to the
LDO output can be programmed to different voltages by changing the feedback network R6 and R7. This LDO
was selected for low noise and flexibility.
-15V
C16
25V
10uF
GND
8 ADS8555EVM-PDK Evaluation Module
™
E3632A). The high-voltage supplies have transient voltage suppressor diodes to
Figure 4-1 also shows how each supply has a light-emitting diode (LED) monitor
D1
SMAJ 15A
+15V
C20
10µF
GND
HVSS HVDD
HVSS
R18 R19
HVDD
10.0k 10.0k
D3 D4
APT2012LZGCK APT2012LZGCK
Green Green
GND GND
Figure 4-1. External Power Connections and Test Points
-15V
R4
TP3
0
U4
8
IN
5
EN
6
NR /SS
7
DN C
C19
50V
3
NC
10nF
TPS7A3001DRBR
GND
Figure 4-2. Low-Dropout Regulator (TPS7A3001 for HVSS)
Copyright © 2021 Texas Instruments Incorporated
J1
D2
SMAJ 15A
-15V
GND C26
10µF
GND
AVDD BVDD
AVDD BVDD
R20 R30
6.65k 6.65k
D5
APT2012LZGCK
Green
GND GND
TPS7A3001
R5
1
OUT
0
R6
C17
93.1k
50V
2
10nF
F B
R7
10.0k
4
GND
9
PAD
GND
SLAU298A – NOVEMBER 2009 – REVISED MAY 2021
D6
APT2012LZGCK
Green
LDO to generate –12 V. This
HVSS
C18
25V
10uF
GND
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