EVAL-AD5933EBZ Datasheet, PDF (11/32 Pages) Analog Devices – Evaluation Board for the 1 MSPS 12-Bit Impedance Converter Network Analyzer

Preliminary Technical Data
1A
1B
EVAL-AD5933EB
2
3
4
Figure 14. AD5933 Evaluation Software Main Dialog Box (The Impedance Profile of a 200 kΩ Resistor Is Displayed.)
Choose the external oscillator as the system clock. Select
External Clock in the System clock section of the front
panel (see Arrow 1B).
Set the output excitation voltage range of the AD5933 at Pin 6
(VOUT) to 2 V p-p (see Arrow 1B). The four possible output
ranges available are 2 V p-p, 1 V p-p, 0.4 V p-p, and 0.2 V p-p
typically.
In the PGA Control section, select the Gain = ×1 option to set
the gain on the receive stage (see Arrow 1B).
Refer to the Calibration Impedance box (see Arrow 1B). Prior
to making any measurements, calibrate the AD5933 with a
known (that is, accurately measured) calibration impedance
connected between the VIN and VOUT pins of the AD5933.
The choice of calibration impedance topology (for example, R1
in series with C1, R1 in parallel with C1, etc.) depends on the
application in question. However, you must ensure that each
component of the measured calibration impedance is entered
correctly into each chosen topology component text box (see
Arrow 1B). For example, in Figure 14 the Resistor only R1
option is selected to measure the impedance of a 200 kΩ
resistive impedance across frequency. For this example, type
200E3 (Ω) into the Resistor Value R1 box.
To program the sweep parameters as chosen above into the
appropriate on-board registers of the AD5933 through the I²C
interface, click Program Device Registers (see Arrow 2).
The value programmed into the Number of Settling Time
Cycles box can be set so that the settling time is multiplied by a
factor of 2 or 4 for a sweep (Arrow 3A). Select the ×1 (Default)
option.
Now that the frequency sweep parameters and gain settings are
programmed, the next step is to calibrate the AD5933 system by
calculating the gain factor.
Rev. PrC | Page 11 of 32