AD7747ARUZ-REEL datasheet(10/29 Pages) AD

No de pièce	AD7747ARUZ-REEL

Description	24-Bit Capacitance-to-Digital Converter

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Fabricant	AD [Analog Devices]

Site Internet	http://www.analog.com

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AD7747

Rev. 0 | Page 9 of 28

150

–150

01k

PARALLEL RESISTANCE (MΩ)

10

100

50

0

–50

–100

Figure 10. Capacitance Input Error vs. Parallel Resistance;

CIN(+) to GND = 8 pF, VDD = 5 V

0

–1000

0

200

CIN TO SHLD RESISTANCE (kΩ)

–100

–200

–300

–400

–500

–600

–700

–800

–900

25

50

75

100

125

150

175

Figure 11. Capacitance Input Error vs. Resistance Between CIN1(+) and SHLD;

CIN(+) to GND = 8 pF, VDD= 5 V

100

–1000

0.091

CIN TO SHLD RESISTANCE (MΩ)

–100

0

–200

–300

–400

–500

–600

–700

–800

–900

0.27

0.48

0.96

5

25

100

Figure 12. Capacitance Input Error vs. Resistance Between CIN(+) and SHLD;

CIN(+) to GND = 25 pF, VDD = 5 V

1.0

–1.0

0.01

100

SHLD TO GND RESISTANCE (MΩ)

0.1

1.0

10.0

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

Figure 13. Capacitance Input Error vs. Resistance Between SHLD and GND;

CIN(+) to GND = 8 pF; VDD = 5 V

10

–100

1

100

SERIAL RESISTANCE (kΩ)

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

25 pF

8 pF

Figure 14. Capacitance Input Error vs. Serial Resistance;

CIN(+) to GND = 8 pF and 25pF, VDD = 5 V

0.2

–0.6

2.5

5.5

VDD (V)

0

–0.2

–0.4

3.0

3.5

4.0

4.5

5.0

Figure 15. Capacitance Input Power Supply Rejection (PSR);

CIN(+) to GND = 8 pF

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