Power Supplies; Adc Input Driver Configuration; Adc Voltage Reference Configuration; Table 4-1. Jumper Settings For Adc Input Driver Configuration - Texas Instruments ADS8354EVM-PDK User Manual

Power Supplies

4 Power Supplies
AVDD operates from 4.5 V to 5.5 V. DVDD operates from 1.65 V to 5.5 V, independent of the AVDD supply.
The analog portion of the ADS8354EVM operates from a 5-V supply (VA) generated using the TPS7A47-Q1 low-
noise, low-dropout regulator. The same supply is used to power the positive supply of the THS4561 front-end
driver amplifiers, and the negative –232-mV supply (AVSS) is generated using the LM7705 low-noise negative
bias generator. AVSS can also be set to GND by shorting pins 2 and 3 of JP9.
The TPS7A47-Q1 regulator can be configured to generate a VA supply other than 5 V through programmable pin
settings. For more information, see the Detailed Description section of the TPS7A47-Q1 device data sheet.
The digital portion of the ADC operates from a 3.3-DVDD supply from the PHI.

4.1 ADC Input Driver Configuration

The ADS8354 only supports fully differential inputs. The ADS8354EVM allows the user to apply a fully-
differential signal on the SMA or jumpers mentioned in the input signal path, as discussed in
A provision for a single-ended to differential conversion exists by populating JP1 or JP2 and applying a
single-ended signal on the unpopulated jumper. The THS4561 common-mode voltage (VOCM) is set by the
REF56025. REFIO / 2 can be used for VOCM by populating JP5 for ADCA and JP6 for ADCB. For various
analog input full-scale ranges supported by the ADS8354 in fully-differential mode, see the
Table 4-1 shows the jumper configurations required for single-ended and fully differential analog inputs.

Table 4-1. Jumper Settings for ADC Input Driver Configuration

ADC Input Type
Single-ended analog inputs
Fully differential analog
inputs

4.2 ADC Voltage Reference Configuration

The ADS8354 has a low-noise, low-drift, 2.5-V internal voltage reference. By default, the ADS8354EVM is
configured to work with the ADC internal reference voltage of 2.5 V. The same reference voltage is brought on
pin 2 of jumpers JP7 and JP8 that can be used to drive the THS4561 common-mode voltage (VOCM) pin.
There is also a provision for using an external voltage reference for the ADC. The external reference voltage
can be generated by populating JP7 and JP8 jumpers. When using an external reference, the ADS8354 internal
voltage reference must be disabled and the device must be programmed to accept the external reference
voltage on the REFIO_x pins.
8 ADS8354EVM-PDK Evaluation Module
ADC Input Full-Scale Range
±V
REF
±2 × V
REF
±V
REF
±2 × V
REF
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Required Jumper Settings
JP3, JP4 = Open
JP1, JP2 = Closed
JP5, JP6 = Closed
JP3, JP4 = Open
JP1, JP2 = Closed
JP5, JP6 = Open
JP1, JP2, JP3, JP4 = Open
J5, J6 = Closed
JP1, JP2, JP3, JP4 = Open
JP5, JP6 = Open
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Section 2.2.1.
ADS8354 data sheet.
Description
Apply single-ended input at J2, J4
or JP3[1], JP4[1]
Ground unused inputs
Sets VOCM as V / 2
REF
Apply single-ended input at J2, J4
or JP3[1], JP4[1]
Ground unused inputs
Sets VOCM as V
REF
Apply differential input signals to
J1, J2, J3, J4 or JP1[1], JP2[1],
JP3[1], JP4[1]
Sets VOCM as V / 2
REF
Apply differential input signals to
J1, J2, J3, J4 or JP1[1], JP2[1],
JP3[1], JP4[1]
Sets VOCM as V
REF
SBAU407 – APRIL 2023
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