AD7150 Analog Devices, AD7150 Datasheet - Page 9

• Manufacturer Part Number: AD7150
• Description: Ultra-Low Power, 2-Channel, Capacitance Converter for Proximity Sensing
• Manufacturer: Analog Devices

Specifications of AD7150

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: n/a
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: 0.5 pF,1 pF,2 pF,4 pF
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

–0.1
–0.2
0.2
0.1
–2
–4
–1
–2
Figure 16. Capacitance Input Offset Error vs. Temperature,
4
2
0
0
2
1
0
–50
–50
Figure 17. Capacitance Input Gain Error vs. Temperature,
–50
Figure 18. EXC Frequency Error vs. Temperature,
V
DD
–25
–25
–25
= 3.3 V, CIN and EXC Pins Open Circuit
V
DD
= 3.3 V, CIN to EXC = 2 pF
0
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
V
DD
= 3.3 V
25
25
25
50
50
50
75
75
75
100
100
100
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–0.25
–0.50
0.50
0.25
–20
–40
–60
–80
–1
–2
2
1
0
0
0
2.7
0
0
Figure 20. Capacitance Channel Frequency Response
Figure 21. CAPDAC Differential Nonlinearity (DNL),
Figure 19. EXC Frequency Error vs. V
1
16
INPUT SIGNAL FREQUENCY (kHz)
3.0
V
CAPDAC CODE
DD
2
V
= 3.3 V
DD
32
(V)
3
3.3
48
DD
4
AD7150
3.6
6
5
4