AD7156 datasheet(8/28 Pages) AD

8 / 28 page

AD7156

Rev. 0 | Page 8 of 2

100

150

200

250

300

CAPACITANCE CIN TO GROUND (pF)

TYPICAL PERFORMANCE CHARACTERISTICS

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

1.8V

3.3V

–1

–2

–3

–4

500

1000

1500

2000

CAPACITANCE EXC TO GROUND (pF)

1.8V

3.3V

Figure 4. Capacitance Input Offset Error vs. Capacitance CIN to GND,

VDD = 1.8 V and 3.3 V, EXC Pin Open Circuit

Figure 7. Capacitance Input Offset Error vs. Capacitance EXC to GND,

VDD = 1.8 V and 3.3 V, CIN Pin Open Circuit

–5

–10

–15

–20

–25

100

150

200

250

300

CAPACITANCE CIN TO GROUND (pF)

1.8V

3.3V

500

1000

1500

2000

CAPACITANCE EXC TO GROUND (pF)

1.8V

3.3V

–1

–2

–3

–4

–1

–2

–3

–4

500

1000

1500

2000

CAPACITANCE EXC TO GROUND (pF)

Figure 5. Capacitance Input Gain Error vs. Capacitance CIN to GND,

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

Figure 8. Capacitance Input Gain Error vs. Capacitance EXC to GND,

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

–5

–10

–15

–20

–25

100

150

200

250

300

CAPACITANCE CIN TO GROUND (pF)

1.8V

3.3V

Figure 6. Capacitance Input Gain Error vs. Capacitance CIN to GND,

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

1.8V

3.3V

Figure 9. Capacitance Input Gain Error vs. Capacitance EXC to GND,

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

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