Analog Devices ADICUP3029 User Manual page 9

EVAL-AD5940 Evaluation Kit User Guide
9. Click the Body Impedance measurement to highlight it
and view the configurable parameters beneath. The body
impedance parameters that can be set are shown in Table 2
10. Once the desired parameters are set, press the green
Measure button to begin collecting data.
Table 2. Body Impedance Measurement Parameters
Parameter
Internal R Selection
TIA
Transimpedance Amplifier
Capacitance
Calibration Resistor
Start
Stop
Points
Logarithmic
Power Mode
Filter Level
Hanning Window
DFT Number
Amplitude
PGA Gain Select
Resistor on Impedance Test Board
1 For more information on Body Impedance measurements on the AD5940, refer to the AN-1557.
F+
S+
S-
F-
Description
Resistor value in the feedback loop of the transimpedance amplifier.
Capacitor value in the transimpedance amplifier (depends on the
maximum current range) .
1
Known impedance value voltage is applied to for system calibration.
Initial frequency of the voltage applied.
Highest frequency of the voltage applied.
Number of different frequencies (sampling points) between start and stop.
When a frequency sweep is performed, defines whether the frequency
increments are logarithmic or not.
Power level of the board.
Level of the SINC filter applied to data coming from the analog-to-digital
converter (ADC).
Selects whether the data is filtered through a Hanning window or not.
Level of the discrete Fourier transform applied to the data.
Magnitude of the voltage applied.
Programmable gain amplifier.
Resistance being measured.
Figure 20. Measurement Block Diagram
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11. The results are the absolute impedance value and
force/sense out the isolation components in the paths on
F+ and F−
UG-1292
Value for Test
1 kΩ
16 pF
10000 Ω
10000 Hz
10000 Hz
50
Yes
Automatic
Level 1.1—SINC3 OSR2
Yes
16384
800 mV-pp
GNPGA_1_5
200 Ω