AD7877 datasheet(12/44 Pages) AD

12 / 44 page

AD7877

Rev. A | Page 12 of 44

3145

3135

3125

3115

3105

3095

3085

3075

3065

3055

3045

–50

–30

–10

10305070

TEMPERATURE (

°C)

Figure 17. 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 18. 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 19. Temp0 vs. VCC

TURN-ON TIME (

µs)

100

120

–20

NO CAP

0.711

µs SETTLING TIME

100nF CAP

54.64

µs SETTLING TIME

Figure 20. Internal VREF vs. Turn-On Time

–150

–130

–110

–90

–70

–50

–30

–10

10k

20k

30k

SNR 70.25dB

THD 78.11dB

40k

FREQUENCY

Figure 21. Typical FFT Plot for the Auxiliary Channels of the AD7877

at 90 kHz Sample Rate and 10 kHz Input Frequency

3.50

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

0123456789

SOURCE/SINK CURRENT (mA)

DAC O/P SOURCE ABILITY

DAC O/P SINK ABILITY

Figure 22. DAC Source and Sink Current Capability

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