AD7153 Analog Devices, AD7153 Datasheet - Page 9

• Manufacturer Part Number: AD7153
• Description: 12-Bit Capacitance-to-Digital Converter (1 Capacitance Input Channel)
• Manufacturer: Analog Devices

Specifications of AD7153

• Resolution (bits): 12bit
• # Chan: 1
• Sample Rate: 200SPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: Capacitive
• Ain Range: ±0.25 pF to ±2 pF Diff,0.5 pF to 4 pF SE
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

Figure 12. Capacitance Input Error vs. Capacitance Between EXC and GND,
Figure 14. Capacitance Input Error vs. Parasitic Resistance EXC to GND,
Figure 13. Capacitance Input Error vs. Parasitic Resistance CIN to GND,
–10
–0.1
–0.2
–0.3
–0.2
–0.4
–0.6
–2
–4
–6
–8
0.3
0.2
0.1
0.6
0.4
0.2
2
0
0
0
1
1
0
Single-Ended Mode, CIN(+) to EXC = 9 pF, VDD = 3.3 V
Single-Ended Mode, CIN(+) to EXC = 9 pF, VDD = 3.3 V
50
Differential Mode, CIN(+) to EXC = 8 pF,
CIN(−) to EXC = 6 pF, V
RESISTANCE CIN TO GROUND (MΩ)
RESISTANCE EXC TO GROUND (MΩ)
100
10
CAP LOAD TO GND (pF)
10
150
200
DD
= 3.3 V
100
100
250
300
1000
1000
350
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Figure 15. Capacitance Input Error vs. Parasitic Parallel Resistance
Single-Ended Mode, CIN(+) to EXC = 3 pF and 9 pF, VDD = 3.3 V
–0.2
–0.4
–0.6
–0.8
–1.0
–10
–15
–20
–25
–30
–10
–20
–30
–40
–50
0.2
0.0
10
–5
Figure 17. Capacitance Input Power Supply Rejection (PSR),
0
0
2.6
Figure 16. Capacitance Input Error vs. Serial Resistance,
1
0
Single-Ended Mode, CIN(+) to EXC = 9 pF, VDD = 3.3 V
Differential Mode; CIN(+) to EXC = 1.9 pF
2.8
20
PARALLEL RESISTANCE (MΩ)
SERIAL RESISTANCE (kΩ)
3.0
10
40
VDD (V)
3.2
60
AD7152/AD7153
100
3.4
9pF
3pF
80
3.6
1000
1
3.8
00