AD7877_17 datasheet(12/46 Pages) AD

Teilenummer	AD7877

Bauteilbeschribung	Touch Screen Controller

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Data Sheet

AD7877

3145

3135

3125

3115

3105

3095

3085

3075

3065

3055

3045

–50

–30

–10

10

30

50

70

90

TEMPERATURE (

°C)

Figure 18. ADC Code vs. Temperature (2.7 V Supply)

1183

1176

1177

1178

1179

1180

1181

1182

2.7

2.8

2.9

3.0

3.1

3.2

3.3

3.4

3.5

3.6

VCC (V)

Figure 19. Temp1 vs. VCC

982

975

976

977

978

979

980

981

2.7

2.8

2.9

3.0

3.1

3.2

3.3

3.4

3.5

3.6

VCC (V)

Figure 20. Temp0 vs. VCC

TURN-ON TIME (

µs)

0

2.5

6

20

40

60

80

100

120

–20

0

NO CAP

0.711

µs SETTLING TIME

100nF CAP

54.64

µs SETTLING TIME

Figure 21. Internal VREF vs. Turn-On Time

10

–150

–130

–110

–90

–70

–50

–30

–10

0

10k

20k

30k

SNR 70.25dB

THD 78.11dB

40k

FREQUENCY

Figure 22. Typical FFT Plot for the Auxiliary Channels of the AD7877

at 90 kHz Sample Rate and 10 kHz Input Frequency

3.50

0

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

3.25

0

1

2

3

4

5

6

7

8

9

10

SOURCE/SINK CURRENT (mA)

DAC O/P SOURCE ABILITY

DAC O/P SINK ABILITY

Figure 23. DAC Source and Sink Current Capability

Rev. E | Page 11 of 45

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