Datasheet

AD7156
Rev. 0 | Page 9 of 28
–10
1 10 100 1k
07726-010
2
0
–2
–4
–6
–8
GAIN ERROR (%FSR)
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0.1 1 10 100 1k
GAIN ERROR (%FSR)
RESISTANCE EXC TO GROUND (M)
07726-013
1.8V
3.3V
1.8V
3.3V
RESISTANCE CIN TO GND (M)
Figure 10. Capacitance Input Gain Error vs. Resistance CIN to GND,
V
DD
= 1.8 V and 3.3 V, CIN to EXC = 3 pF
2
0
–2
–4
–6
–8
GAIN ERROR (%FSR)
1
–10
1 10 100 1k
RESISTANCE CIN TO GND (M)
07726-01
1.8V
3.3V
Figure 11. Capacitance Input Gain Error vs. Resistance CIN to GND,
V
DD
= 1.8 V and 3.3 V, CIN to EXC = 9 pF
0.2
0
–0.2
–0.4
–0.6
–0.8
GAIN ERROR (%FSR)
2
–1.0
0.1 1 10 100 1k
RESISTANCE EXC TO GROUND (M)
07726-01
1.8V
3.3V
Figure 12. Capacitance Input Gain Error vs. Resistance EXC to GND,
V
DD
= 1.8 V and 3.3 V, CIN to EXC = 3 pF
Figure 13. Capacitance Input Gain Error vs. Resistance EXC to GND,
V
DD
= 1.8 V and 3.3 V, CIN to EXC = 9 pF
1
0
–1
–2
–4
–6
–3
–5
–7
0 20406080100
GAIN ERROR (%FSR)
SERIAL RESISTANCE (k)
07726-014
1.8V
3.3V
Figure 14. Capacitance Input Gain Error vs. Serial Resistance,
V
DD
= 1.8 V and 3.3 V, CIN to EXC = 3 pF
10
0
–10
–20
–30
–40
–50
GAIN ERROR (%FSR)
07726-015
1 10 100 1k
PARELLEL RESISTANCE (M)
1.8V
3.3V
Figure 15. Capacitance Input Gain Error vs. Parallel Resistance,
V
DD
= 1.8 V and 3.3 V, CIN to EXC = 3 pF