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AD7490BRUZ-REEL Datasheet(PDF) 8 Page - Analog Devices |
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AD7490BRUZ-REEL Datasheet(HTML) 8 Page - Analog Devices |
8 / 28 page AD7490 Data Sheet Rev. D | Page 8 of 28 TYPICAL PERFORMANCE CHARACTERISTICS Figure 5 shows a typical FFT plot for the AD7490 at 1 MSPS sample rate and 50 kHz input frequency. Figure 7 shows the power supply rejection ratio vs. supply ripple frequency for the AD7490. The power supply rejection ratio is defined as the ratio of the power in the ADC output at full-scale frequency f, to the power of a 200 mV p-p sine wave applied to the ADC VDD supply of frequency fS. ( ) × = s Pf Pf PSRR log 10 dB where: Pf is equal to the power at frequency f in ADC output. PfS is equal to power at frequency fS coupled onto the ADC VDD supply input. Here, a 200 mV p-p sine wave is coupled onto the VDD supply. 10 nF decoupling was used on the supply, and a 1 µF decoupling capacitor was used on the REFIN pin. 5 –95 –75 –55 –35 –15 0 50 100 150 200 250 300 350 400 500 450 8192 POINT FFT fSAMPLE = 1MSPS fIN = 50kHZ SINAD = 70.697dB THD = –79.171dB SFDR = –79.93dB FREQUENCY (kHz) Figure 5. Dynamic Performance at 1 MSPS 75 55 60 65 70 10 100 1000 INPUT FREQUENCY (kHz) fS = MAX THROUGHPUT TA = 25°C RANGE = 0V TO REFIN VDD = VDRIVE = 5.25V VDD = VDRIVE = 4.75V VDD = VDRIVE = 3.6V VDD = VDRIVE = 2.7V Figure 6. SINAD vs. Analog Input Frequency for Various Supply Voltages at 1 MSPS –20 –90 –80 –70 –60 –50 –40 –30 0 100k 200k 300k 400k 500k 600k 700k 800k 900k 1M INPUT FREQUENCY (Hz) VDD = 5V VDD = 3V VDD = 3V/5V, 10nF CAP 200mV p-p SINE WAVE ON VDD REFIN = 2.5V, 1µF CAP TA = 25°C Figure 7. PSRR vs. Supply Ripple Frequency –50 –90 –85 –80 –75 –70 –65 –60 –55 10 100 1000 INPUT FREQUENCY (kHz) VDD = VDRIVE = 2.7V VDD = VDRIVE = 3.6V VDD = VDRIVE = 4.75V VDD = VDRIVE = 5.25V fS = MAX THROUGHPUT TA = 25°C RANGE = 0V TO REFIN Figure 8. THD vs. Analog Input Frequency for Various Supply Voltages at 1 MSPS |
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