AD7156 datasheet(9/28 Pages) AD

9 / 28 page

AD7156

Rev. 0 | Page 9 of 28

–10

100

–2

–4

–6

–8

0.2

–0.2

–0.4

–0.6

–0.8

–1.0

0.1

100

RESISTANCE EXC TO GROUND (MΩ)

1.8V

3.3V

1.8V

3.3V

RESISTANCE CIN TO GND (MΩ)

Figure 10. Capacitance Input Gain Error vs. Resistance CIN to GND,

VDD = 1.8 V and 3.3 V, CIN to EXC = 3 pF

–2

–4

–6

–8

–10

100

RESISTANCE CIN TO GND (MΩ)

1.8V

3.3V

Figure 11. Capacitance Input Gain Error vs. Resistance CIN to GND,

VDD = 1.8 V and 3.3 V, CIN to EXC = 9 pF

0.2

–0.2

–0.4

–0.6

–0.8

–1.0

0.1

100

RESISTANCE EXC TO GROUND (MΩ)

1.8V

3.3V

Figure 12. Capacitance Input Gain Error vs. Resistance EXC to GND,

VDD = 1.8 V and 3.3 V, CIN to EXC = 3 pF

Figure 13. Capacitance Input Gain Error vs. Resistance EXC to GND,

VDD = 1.8 V and 3.3 V, CIN to EXC = 9 pF

–1

–2

–4

–6

–3

–5

–7

20406080

100

SERIAL RESISTANCE (kΩ)

1.8V

3.3V

Figure 14. Capacitance Input Gain Error vs. Serial Resistance,

VDD = 1.8 V and 3.3 V, CIN to EXC = 3 pF

–10

–20

–30

–40

–50

100

PARELLEL RESISTANCE (MΩ)

1.8V

3.3V

Figure 15. Capacitance Input Gain Error vs. Parallel Resistance,

VDD = 1.8 V and 3.3 V, CIN to EXC = 3 pF

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