AD7746 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
AD7746 Datasheet PDF : 28 Pages
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8
6
4
2
0
–2
3V
–4
–6
2.7V
–8
–10
–12
–250 –200 –150 –100 –50 0
50 100 150 200 250
CIN LEAKAGE TO GND (nA)
Figure 12. Capacitance Input Error vs. Leakage Current to GND,
CIN(+) to EXC = 4 pF, CIN(−) to EXC = 0 pF,
VDD = 2.7 V and 3 V
8
6
4
2
0
5V
–2
–4
–6
–8
3.3V
–10
–12
–250 –200 –150 –100 –50 0
50 100 150 200 250
CIN LEAKAGE TO GND (nA)
Figure 13. Capacitance Input Error vs. Leakage Current to GND,
CIN(+) to EXC =4 pF, CIN(−) to EXC = 0 pF,
VDD=3.3 V and 5 V
10
1
0.1
0.01
0.001
0.0001
1
10
100
1000
10000
PARALLEL RESISTANCE (MΩ)
100000
Figure 14. Capacitance Input Error vs. Resistance in Parallel
with Measured Capacitance
AD7745/AD7746
0
–2
–4
–6
–8
–10
0
1
2
3
4
5
6
7
SERIAL RESISTANCE (kΩ)
Figure 15. Capacitance Input Error vs. Serial Resistance,
CIN(+) to EXC = 21 pF, CIN(−) to EXC = 23 pF, VDD = 5 V,
the Same Configuration as in Figure 34.
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VDD (V)
Figure 16. Capacitance Input Power Supply Rejection (PSR),
CIN(+) to EXC = 4 pF, the Same Configuration as in Figure 30
0.20
0.15
0.10
0.05
0
–0.05
–0.10
–0.15
–0.20
0
16
32
48
64
80
96 112 128
CAPDAC CODE
Figure 17. CAPDAC Differential Nonlinearity (DNL)
Rev. 0| Page 9 of 28
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