AD5934 datasheet(17/32 Pages) AD

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AD5934

Rev. 0 | Page 17 of 32

Range 4 (100 kΩ to 1 MΩ)

Output excitation voltage = 2 V p-p

Calibration impedance value, ZCALIBRATION = 100 kΩ

PGA gain = ×1

Supply voltage = 3.3 V

Current-to-voltage amplifier gain resistor = 100 kΩ

1.0

–3.5

FREQUENCY (kHz)

100

0.5

–0.5

–1.0

–1.5

–2.0

–2.5

–3.0

500k

RFB = 100k

CALIBRATION IMPEDANCE = 100k

TA = 25°C

Figure 25. Range 4: Typical % Impedance Error over Frequency

Range 5 (1 MΩ to 2 MΩ)

Output excitation voltage = 2 V p-p

Calibration impedance value, ZCALIBRATION = 100 kΩ

PGA gain = ×1

Supply voltage = 3.3 V

Current to voltage amplifier gain resistor = 100 kΩ

–9

FREQUENCY (kHz)

100

–1

–3

–5

–7

RFB = 1M

CALIBRATION IMPEDANCE = 1M

TA = 25°C

1.5M

Figure 26. Range 5: Typical % Impedance Error over Frequency

Range 6 (9 MΩ to 10 MΩ)

Output excitation voltage = 2 V p-p

Calibration impedance value, ZCALIBRATION = 9 MΩ

PGA gain = ×1

Supply voltage = 3.3 V

Current to voltage amplifier gain resistor = 9 MΩ

–10

FREQUENCY (kHz)

–2

–4

–6

–8

100

RFB = 10M

CALIBRATION IMPEDANCE = 10M

TA = 25°C

9.5M

10M

Figure 27. Range 6: Typical % Impedance Error over Frequency

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