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4 Power Supplies
The default state of the EVM is that all power supplies are generated using the USB power from the PHI
controller. This section shows how external power connections can be made. Also, this section shows the default
configuration for AVDD is generated with a 5-V low-dropout regulator (LDO).
4.1 Power Connection and Configuration
Figure 4-1 shows connections to external supplies for the amplifier, reference, and data converter. The default
state of the EVM is that the power is provided by the PHI digital controller board via the USB port. The external
power connections can be used in cases where the PHI does not provide the needed voltage. For example, the
PHI does not provide negative voltages, so if a negative AVSS is needed an external power supply is required.
To use the external power connections for AVDD and IOVDD, change the 0-Ω resistor connections (R71, R74,
and R81).
Connector J12 can optionally be used to supply power to the onboard 5-V and –2.5-V regulators. In this case,
the allowable voltage range for –VinExt is –15.5 V < –VinExt < –3.5 V and +VinExt is 6 V< +VinExt < 15.5 V.
1uF
C53
EVM/External Power
1uF
C51
AVDD1 AVDD2 IOVDD
A
VSS
A
VDD1
A
VSS
A
VDD2
GND
-V
inExt
GND
IOVDD
1uF
C54
1 2
J10
1 2
J11
1 2
J13
5.6V
D6
MMSZ4690T1G
5.6V
D4
MMSZ4690T1G
5.6V
D5
MMSZ4690T1G
GND
AVSS
GND
1 2 3
J12
GND
+Vin -Vin
+V
inExt
1.0
R76
1.0
R79
1.0
R77
5V_LDO
IOVDD EVM_DVDD
0R81
0R71
AVDD1
0R74
AVDD2 5V_LDO
EVM/PHI Power
GND GND GND
AMP/REF Power Configuration
16V
D1
MMSZ4703T1G
16V
D2
MMSZ4703T1G
GND GND
1uF
C42
1uF
C43
VP VM
1
2 3
J7
0393570003
1.0
R61
1.0
R62
Figure 4-1. Power Connection and Configuration
www.ti.com Power Supplies
SBAU351 – APRIL 2021
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ADS127L11EVM-PDK Evaluation Module 11
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