AD7746 Analog Devices, AD7746 Datasheet - Page 10

• Manufacturer Part Number: AD7746
• Description: 24-bit, 2 Channel Capacitance to Digital Converter
• Manufacturer: Analog Devices

Specifications of AD7746

• Resolution (bits): 24bit
• # Chan: 2
• Sample Rate: n/a
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref) p-p,± 4 pF (Delta C)
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

AD7745/AD7746
–100
–120
–0.5
–1.0
–1.5
–2.0
–0.5
–1.0
–1.5
–2.0
–2.5
–3.0
Figure 19. External Temperature Sensor Error vs. Temperature
Figure 18. Internal Temperature Sensor Error vs. Temperature
–20
–40
–60
–80
2.0
1.5
1.0
0.5
1.0
0.5
0
0
0
–50
–50
0
Figure 20. Capacitance Channel Frequency Response,
100
–25
–25
200
INPUT SIGNAL FREQUENCY (Hz)
Conversion Time = 11 ms
0
0
300
TEMPERATURE (°C)
TEMPERATURE (°C)
25
25
400
500
50
50
600
75
75
700
100
100
800
125
125
900
1000
150
150
Rev. 0 | Page 10 of 28
–100
–120
–100
–120
–100
–120
–20
–40
–60
–80
–20
–40
–60
–80
–20
–40
–60
–80
0
0
0
0
Figure 21. Capacitance Channel Frequency Response,
0
Figure 22. Capacitance Channel Frequency Response,
0
Figure 23. Voltage Channel Frequency Response,
50
50
50
Conversion Time = 109.6 ms
Conversion Time = 122.1 ms
100
100
100
INPUT SIGNAL FREQUENCY (Hz)
Conversion Time = 62 ms
INPUT SIGNAL FREQUENCY (Hz)
INPUT SIGNAL FREQUENCY (Hz)
150
150
150
200
200
200
250
250
250
300
300
300
350
350
350
400
400
400