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EVAL-AD7923CB2 Datasheet(PDF) 8 Page - Analog Devices |
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EVAL-AD7923CB2 Datasheet(HTML) 8 Page - Analog Devices |
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8 / 20 page  –8– AD7923–Typical Performance Characteristics REV. 0 PERFORMANCE CURVES TPC 1 shows a typical FFT plot for the AD7923 at 200 kSPS sample rate and 50 kHz input frequency. TPC 2 shows the signal-to-(noise+distortion) ratio performance versus input frequency for various supply voltages while sampling at 200 kSPS with an SCLK of 20 MHz. TPC 3 shows the power supply rejection ratio versus supply ripple frequency for the AD7923 with no decoupling. 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 AVDD supply of frequency fS: PSRR dB Pf Pfs () log( / ) = 10 Pf is equal to the power at frequency f in ADC output; PfS is equal to the power at frequency fS coupled onto the ADC AVDD supply. Here a 200 mV p-p sine wave is coupled onto the AVDD supply. TPC 4 shows a graph of total harmonic distortion versus analog input frequency for various supply voltages, while TPC 5 shows a graph of total harmonic distortion versus analog input frequency for various source impedances. See the Analog Input section. TPC 6 and TPC 7 show typical INL and DNL plots for the AD7923. FREQUENCY – kHz –10 020 406080 100 –30 –50 –70 –90 –110 10 30 50 70 90 4096 POINT FFT AVDD = 4.75V fSAMPLE = 200kSPS fIN = 50kHz SINAD = 70.714dB THD = –82.853dB SFDR = –84.815dB TPC 1. Dynamic Performance at 200 kSPS INPUT FREQUENCY – kHz 75 0 100 70 65 60 fSAMPLE = 200kSPS TA = 25 C RANGE = 0 V TO REFIN AVDD = V DRIVE = 5.25V AVDD = V DRIVE = 4.75V AVDD = V DRIVE = 3.6V AVDD = V DRIVE = 2.7V TPC 2. SINAD vs. Analog Input Frequency for Various Supply Voltages at 200 kSPS SUPPLY RIPPLE FREQUENCY – kHz 0 0 200 –40 –60 –80 –90 100 –20 –50 –70 180 160 140 120 80 60 40 20 AVDD = 5V, 200mV p-p SINE WAVE ON AVDD REFIN = 2.5V, 1 F CAPACITOR TA = 25 C –10 –30 TPC 3. PSRR vs. Supply Ripple Frequency INPUT FREQUENCY – kHz –50 10 100 –65 –75 –85 –90 –55 –70 –80 fSAMPLE = 200kSPS TA = 25 C RANGE = 0V TO REFIN –60 AVDD = V DRIVE = 2.7V AVDD = V DRIVE = 3.6V AVDD = V DRIVE = 4.75V AVDD = V DRIVE = 5.25V TPC 4. THD vs. Analog Input Frequency for Various Supply Voltages at 200 kSPS INPUT FREQUENCY – kHz –55 10 100 –70 –80 –90 –95 –60 –75 –85 fSAMPLE = 200kSPS TA = 25 C AVDD = 5.25V RANGE = 0V TO REFIN –65 RIN = 50 RIN = 100 RIN = 10 RIN = 1000 TPC 5. THD vs. Analog Input Frequency for Various Source Impedances |
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