AD7142_17 datasheet(10/70 Pages) AD

No. de pieza	AD7142

Descripción Electrónicos	Programmable Controller for Capacitance Touch Sensors

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Fabricante Electrónico	AD [Analog Devices]

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10 / 70 page

AD7142

Data Sheet

Rev. B | Page 10 of 70

TYPICAL PERFORMANCE CHARACTERISTICS

VCC (V)

820

860

840

920

900

880

940

960

980

1000

2.7

2.9

2.8

3.0

3.1

3.2

3.3

3.4

3.5

3.6

DEVICE 3

DEVICE 1

DEVICE 2

Figure 8. Supply Current vs. Supply Voltage

(VCC = AVCC + DVCC, ICC = AICC + DICC)

2.7

2.8

2.9

3.0

3.1

3.2

3.4

3.3

3.5

3.6

VCC (V)

40

60

100

80

120

140

160

180

LP_CONV_DELAY = 200ms

LP_CONV_DELAY = 400ms

LP_CONV_DELAY = 600ms

LP_CONV_DELAY = 800ms

Figure 9. Low Power Supply Current vs. Supply Voltage,

Decimation Rate = 256 (VCC = AVCC + DVCC, ICC = AICC + DICC)

2.7

2.8

2.9

3.0

3.10

3.2

3.4

3.3

3.5

3.6

VCC (V)

20

40

60

80

100

120

LP_CONV_DELAY = 200ms

LP_CONV_DELAY = 600ms

LP_CONV_DELAY = 800ms

LP_CONV_DELAY = 400ms

Figure 10. Low Power Supply Current vs. Supply Voltage

Decimation Rate = 128 (VCC = AVCC + DVCC, ICC = AICC + DICC)

1.40

1.55

1.70

1.85

2.00

2.15

2.30

2.45

2.7

2.9

2.8

3.0

3.1

3.2

3.3

3.4

3.5

3.6

VCC (V)

DEVICE 2

DEVICE 3

DEVICE 1

Figure 11. Shutdown Supply Current vs. Supply Voltage

(VCC = AVCC + DVCC, ICC = AICC + DICC)

1.10

1.05

1.00

0.95

0.90

0.85

0.80

0

50

100 150 200 250 300 350 400 450 500

CAPACITANCE LOAD ON SOURCE (pF)

DEVICE 3

DEVICE 2

DEVICE 1

Figure 12. Supply Current vs. Capacitive Load on SRC (ICC = AICC + DICC)

16015

16010

16005

16000

15995

15990

15985

15980

0

50

100 150 200 250 300 350 400 450 500

CAPACITANCE LOAD ON SOURCE (pF)

DEVICE 3

DEVICE 2

DEVICE 1

Figure 13. Output Code vs. Capacitive Load on SRC

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