EVAL-AD5933EBZ datasheet(13/32 Pages) AD

13 / 32 page

Preliminary Technical Data

EVAL-AD5933EB

Rev. PrC | Page 13 of 32

Each data entry corresponds to a single measurement (frequency)

point. Therefore, if you program 511 points as the value for the

number of increments, the array contains a single column of

data with 512 data points, starting at the start frequency value

and ending at the stop frequency value. The stop frequency

value is determined by

Start Frequency + (Number of Increments × Delta Frequency)

Graphs of the impedance profile vs. frequency and the phase profile

vs. frequency appear in the main dialog box of the evaluation

software after the sweep has completed. The user can switch

between the impedance (|Z|) profile and phase (Ø) profile by

clicking the corresponding tabs. The Absolute Impedance |Z|

tab shows how the impedance being analyzed (ZUNKNOWN) varies

across the programmed frequency range. To view how the

phase varies across the network being analyzed, click the

Impedance Phase Ø

tab (see Figure 19).

Figure 19. The Impedance Phase Ø Tab on the Main Dialog Box

(the Phase of a 200 kΩ Resistor (0°) Is Displayed)

Note that the phase measured by the AD5933 takes into account

the phase introduced through the entire signal path, that is, the

phase introduced through the output amplifiers, the receive I-V

amplifier, the low-pass filter, etc., along with the phase through

the impedance (ZØ) being analyzed, which is connected between

VOUT and VIN (Pin 6 and Pin 5 of the AD5933). The phase of the

system must be calibrated using a resistor before any subsequent

impedance phase (ZØ) measurement can be calculated. You need

to perform the calibration with a resistor in the evaluation

software in order to calibrate the system phase correctly. Refer

to the Impedance Measurement Tips section for more details.

FREQUENTLY ASKED QUESTIONS

ABOUT INSTALLATION

How can I confirm that the hardware has been installed

correctly in my computer?

Right-click My Computer and then left-click Properties. On

the Hardware tab, click Device Manager.

Figure 20. System Properties

Scroll to Universal Serial Bus controllers and expand the

directory root (see Figure 21). Figure 21 indicates what to

expect when the AD5933 evaluation board is installed correctly

and the evaluation board and USB cable are connected correctly

to the computer. The root directory is refreshed after the USB

cable is unplugged from the evaluation board, and then the

AD5933 evaluation kit icon is removed from the main root.

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