AD7457BRT-R2 datasheet(8/20 Pages) AD

8 / 20 page

AD7457

Rev. A | Page 8 of 20

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25°C, fS = 100 kSPS, fSCLK = 10 MHz, VDD = 2.7 V to 5.25 V, VREF = 2.5 V, unless otherwise noted.

FREQUENCY (kHz)

VDD = 3V

VDD = 5V

Figure 5. SINAD vs. Analog Input Frequency for VDD = 3 V and 5 V

–20

–40

–80

–60

–120

–100

–140

SUPPLY RIPPLE FREQUENCY (kHz)

100

200

300

400

500

900

1000

VDD = 5V

VDD = 3V

100mV p-p SINE WAVE ON VDD

NO DECOUPLING ON VDD

600

700

800

Figure 6. PSRR vs. Supply Ripple Frequency Without Supply Decoupling

FREQUENCY (kHz)

–20

–40

–80

–60

–120

–100

–140

100

8192 POINT FFT

fSAMPLE = 100kSPS

fIN = 30kHz

SINAD = 71dB

THD = –82dB

SFDR = –83dB

Figure 7. Dynamic Performance for VDD = 5 V

CODE

1.0

0.8

0.6

0.2

0.4

–0.2

–0.4

–0.6

–0.8

–1.0

1024

3072

2048

4096

Figure 8. Typical DNL for the AD7457 for VDD = 5 V

CODE

1.0

0.8

0.6

0.2

0.4

–0.2

–0.4

–0.6

–0.8

–1.0

1024

3072

2048

4096

Figure 9. Typical INL for the AD7457 for VDD = 5 V

CODES

2046

2047

2048

2049

2050

2051

27 CODES

24 CODES

9949

CODES

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

Figure 10. Histogram of 10,000 Conversions of a DC Input

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