User Guide

EVAL-AD74115H

SOFTWARE QUICK START PROCEDURES

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Rev. 0 | 12 of 24

Differential Voltage Measurements

A differential voltage can be measured between the SENSE_EXT1

and SENSE_EXT2 terminals.

In the View Results Tab, configure the AD74115H for differential

measurements as follows:

►

Enable Conversion 2.

►

Select the SENSE_EXT2 to SENSE_EXT1 measurement.

►

The ±12 V provides the widest measurement range.

Figure 11 shows the Conversion 2 results when SENSE_EXT1 is

stepped from +4 V to −3 V and back to 0 V while SENSE_EXT2 is

at 5 V.

Figure 11. Differential Voltage Measurement Example

Programmable Power Control

The ADP1034 provides programmable power control (PCC) that al-

lows dynamically changing the value of VAVDD. Changing the value

of VAVDD results in power savings. The value of VAVDD is set via a

one-wire serial bus between the ADP1034 and the AD74115H.

The GUI allows users to change the VAVDD value using the panel at

the top (see Figure 12). Modify the desired AVDD value and press

Apply button.

Figure 12. Top Panel of the AD74115H Evaluation GUI

The EVAL-AD74115H-ARDZ is designed with the maximum output

voltage up to 24 V of VAVDD. However, the ADP1034 can provide

up to 28 V for VAVDD, which is achieved by changing the Feedback

1 (FB1) resistor values of the ADP1034. Recommended values can

be found at ADP1034 data sheet. This modification results in the

Desired AVDD value displayed in the GUI no longer corresponding

to real value. For this reason, using the direct write to the PPC_TX

register with Address 0x66 is recommended.