AD7403 datasheet(11/25 Pages) AD

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AD7403

Data Sheet

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25°C, VDD1 = 5 V, VDD2 = 5 V, VIN+ = −250 mV to +250 mV, VIN− = 0 V, fMCLKIN = 20 MHz, using a sinc3 filter with a 256 oversampling

ratio (OSR), unless otherwise noted.

–120

–100

–80

–60

–40

–20

200mV p-p SINE WAVE ON VDD1

1nF DECOUPLING

MCLKIN = 20MHz

MCLKIN = 10MHz

SUPPLY RIPPLE FREQUENCY (Hz)

200k

400k

600k

800k

Figure 7. AD7403 PSRR vs. Supply Ripple Frequency

SUPPLY RIPPLE FREQUENCY (Hz)

–140

–120

–100

–80

–60

–40

–20

200k

400k

600k

800k

200mV p-p SINE WAVE ON VDD1

1nF DECOUPLING

MCLKIN = 20MHz

MCLKIN = 10MHz

Figure 8. AD7403-8 PSRR vs. Supply Ripple Frequency

–140

–120

–100

–80

–60

–40

–20

100

10k

100k

RIPPLE FREQUENCY (Hz)

SHORTED INPUTS

200mV p-p SINE WAVE ON INPUTS

MCLKIN = 20MHz, SINC3 DECIMATION RATE = 256

MCLKIN = 10MHz, SINC3 DECIMATION RATE = 256

MCLKIN = 20MHz, UNFILTERED

MCLKIN = 10MHz, UNFILTERED

Figure 9. CMRR vs. Common-Mode Ripple Frequency

100

10k

ANALOG INPUT FREQUENCY (Hz)

16MHz MCLKIN, VDD1 = 4.5V

16MHz MCLKIN, VDD1 = 5.0V

16MHz MCLKIN, VDD1 = 5.5V

20MHz MCLKIN, VDD1 = 4.5V

20MHz MCLKIN, VDD1 = 5.0V

20MHz MCLKIN, VDD1 = 5.5V

Figure 10. SINAD vs. Analog Input Frequency

–160

–140

–120

–100

–80

–60

–40

–20

FREQUENCY (kHz)

SNR = 88.6dB

fIN = 1kHz

SINAD = 88.3dB

THD = –100.5dB

Figure 11. Typical Fast Fourier Transform (FFT)

CODE (k)

–1.0

–0.8

–0.6

–0.4

–0.2

0.2

0.4

0.6

0.8

1.0

Figure 12. Typical DNL Error

Rev. B | Page 10 of 24

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