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AD7490BCP Datasheet(PDF) 8 Page - Analog Devices |
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AD7490BCP Datasheet(HTML) 8 Page - Analog Devices |
8 / 24 page –8– AD7490–Typical Performance Characteristics REV. A TPC 1 shows a typical FFT plot for the AD7490 at 1 MSPS sample rate and 50 kHz input frequency. TPC 3 shows the power supply rejection ratio versus 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. PSRR dB Pf Pf S () log =× 10 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 cap on the REFIN pin. INPUT FREQUENCY – Hz –20 –90 01M 100k 200k 300k 400k 500k 600k 700k 800k 900k –30 –40 –50 –60 –70 –80 VDD 5V VDD 3V VDD 3V/5V, 10nF CAP 200mV p-p SINE WAVE ON V DD REFIN 2.5V, 1 F CAP TA 25 C TPC 3. PSRR vs. Supply Ripple Frequency INPUT FREQUENCY – kHz –50 –90 10 1000 100 –70 –60 –80 VDD VDRIVE 4.75V VDD VDRIVE 5.25V VDD VDRIVE 2.7V VDD VDRIVE 3.6V fS MAX THROUGHPUT TA 25 C RANGE 0 TO REFIN –55 –75 –65 –85 TPC 4. THD vs. Analog Input Frequency for Various Supply Voltages at 1 MSPS INPUT FREQUENCY – kHz –50 10 1000 100 –70 –60 –80 RIN 100 fS 1 MSPS TA 25 C VDD 5.25 V RANGE 0 TO REFIN –55 –75 –65 –85 RIN 1000 RIN 10 RIN 50 RIN 1000 TPC 5. THD vs. Analog Input Frequency for Various Analog Source Impedances 5 –55 –115 –15 –35 –75 –95 FREQUENCY – kHz 0 500 50 100 150 200 250 300 350 400 450 8192 POINT FFT fSAMPLE 1MSPS fIN 50kHz SINAD 70.697dB THD –79.171dB SFDR –79.93dB TPC 1. Dynamic Performance at 1 MSPS INPUT FREQUENCY – kHz 75 55 10 1000 100 65 70 60 VDD VDRIVE 5.25V VDD VDRIVE 4.75V VDD VDRIVE 2.7V VDD VDRIVE 3.6V fS MAX THROUGHPUT TA 25 C RANGE 0 TO REFIN TPC 2. SINAD vs. Analog Input Frequency for Various Supply Voltages at 1 MSPS |
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