AD7298 datasheet(8/28 Pages) AD

No de pièce	AD7298

Description	8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor

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Fabricant	AD [Analog Devices]

Site Internet	http://www.analog.com

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AD7291

Rev. 0 | Page 8 of 28

TYPICAL PERFORMANCE CHARACTERISTICS

1.0

–1.0

–0.8

–0.6

–0.4

–0.2

0

0.2

0.4

0.6

0.8

0

0.5

1.0

1.5

2.0

2.5

3.0

VREF (V)

INL (POSITIVE)

INL (NEGATIVE)

TA = 25°C

VDRIVE = 3V

VDD = 3V

fS = 22.22ksps

fSCL = 400kHz

0

–20

–40

–60

–80

–100

–120

02k

VDD = VDRIVE = 3V

fS = 22.22ksps

fSCL = 400kHz

fIN = 10kHz

SNR = 71.209

THD = –81.66

4k

6k

8k

10k

FREQUENCY (Hz)

Figure 4. Typical FFT

Figure 7. INL vs. External VREF

1.0

0.8

0.6

0.4

0.2

0

–1.0

–0.8

–0.6

–0.4

–0.2

0

500

1000

1500

2000

2500

3000

3500

4096

ADC CODE

TA = 25°C

VDRIVE = 3V

VREF = 2.5V

VDD = 3V

fS = 22.22ksps

fSCL = 400kHz

1.0

–1.0

–0.8

–0.6

–0.4

–0.2

0

0.2

0.4

0.6

0.8

0

0.5

1.0

1.5

2.0

2.5

3.0

VREF (V)

DNL (POSITIVE)

DNL (NEGATIVE)

TA = 25°C

VDRIVE = 3V

VDD = 3V

fS = 22.22ksps

fSCL = 400kHz

Figure 5. Typical ADC INL

Figure 8. DNL vs. External VREF

1.0

0.8

0.6

0.4

0.2

0

–1.0

–0.8

–0.6

–0.4

–0.2

0

500

1000

1500

2000

2500

3000

3500

4096

ADC CODE

TA = 25°C

VDRIVE = 3V

VREF = 2.5V

VDD = 3V

fS = 22.22ksps

fSCL = 400kHz

11.7

11.6

11.5

11.4

11.3

11.2

0

0.5

1.0

1.5

2.0

2.5

EXTERNAL REFERENCE (V)

Figure 6. Typical ADC DNL

Figure 9. Effective Number of Bits vs. VREF, fSCL = 400 kHz

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