Datasheet

AD7156
Rev. 0 | Page 8 of 2
0
0 50 100 150 200 250 300
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
OFFSET ERROR (pF)
07726-004
1.8V
3.3V
1
0
–1
–2
–3
–4
0 500 1000 1500 2000
OFFSET ERROR (fF)
CAPACITANCE EXC TO GROUND (pF)
07726-007
1.8V
3.3V
Figure 4. Capacitance Input Offset Error vs. Capacitance CIN to GND,
V
DD
= 1.8 V and 3.3 V, EXC Pin Open Circuit
Figure 7. Capacitance Input Offset Error vs. Capacitance EXC to GND,
V
DD
= 1.8 V and 3.3 V, CIN Pin Open Circuit
5
0
–5
–10
–15
–20
GAIN ERROR (%FSR)
07726-005
8
–25
0 50 100 150 200 250 300
CAPACITANCE CIN TO GROUND (pF)
1.8V
3.3V
0 500 1000 1500 2000
GAIN ERROR (%FSR)
CAPACITANCE EXC TO GROUND (pF)
07726-008
1.8V
3.3V
1
0
–1
–2
–3
–4
1
0
–1
–2
–3
–4
0 500 1000 1500 2000
GAIN ERROR (%FSR)
CAPACITANCE EXC TO GROUND (pF)
07726-009
Figure 5. Capacitance Input Gain Error vs. Capacitance CIN to GND,
V
DD
= 1.8 V and 3.3 V, CIN to EXC = 3 pF
Figure 8. Capacitance Input Gain Error vs. Capacitance EXC to GND,
V
DD
= 1.8 V and 3.3 V, CIN to EXC = 3 pF
5
0
–5
–10
–15
–20
GAIN ERROR (%FSR)
07726-006
–25
0 50 100 150 200 250 300
CAPACITANCE CIN TO GROUND (pF)
1.8V
3.3V
Figure 6. Capacitance Input Gain Error vs. Capacitance CIN to GND,
V
DD
= 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,
V
DD
= 1.8 V and 3.3 V, CIN to EXC = 9 pF