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AD7866ARU Arkusz danych(PDF) 10 Page - Analog Devices |
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AD7866ARU Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 25 page REV. A AD7866 –9– Typical Performance Characteristics FREQUENCY – kHz 0 –35 –115 0 500 100 200 300 400 –55 –75 –95 50 150 250 350 450 4098 POINT FFT f SAMPLE = 1MSPS fIN = 300kHz SNR = 70.31dB THD = –85.47dB SFDR = –86.64dB –15 TPC 1. Dynamic Performance INPUT FREQUENCY – Hz –61 –75 10k 1M 100k –73 –63 –67 –69 –71 –65 TA = 25 C VDD = VDRIVE = 2.7V VDD = VDRIVE = 3.6V VDD = VDRIVE = 5.25V VDD = VDRIVE = 4.75V TPC 2. SINAD vs. Input Frequency AVDD RIPPLE FREQUENCY – Hz 0 –100 1k 10k –90 –80 –70 –60 –50 –40 –30 –20 –10 100k 1M 100mV p-p SINE WAVE ON AVDD 2.5V EXT REFERENCE ON VREF TA = 25 C VDD = 2.7V VDD = 5.25V VDD = 4.75V VDD = 3.6V TPC 3a. PSRR vs. Supply Ripple Frequency, without Supply Decoupling AVDD RIPPLE FREQUENCY – Hz 0 –100 1k 10k –90 –80 –70 –60 –50 –40 –30 –20 –10 100k 1M 100mV p-p SINE WAVE ON AVDD 2.5V EXT REFERENCE ON DCAPA, DCAPB TA = 25 C VDD = 2.7V VDD = 5.25V VDD = 4.75V VDD = 3.6V TPC 3b. PSRR vs. Supply Ripple Frequency, without Supply Decoupling PERFORMANCE CURVES TPC 1 shows a typical FFT plot for the AD7866 at 1 MHz sample rate and 300 kHz input frequency. TPC 2 shows the signal-to-(noise + distortion) ratio performance versus input frequency for various supply voltages while sampling at 1 MSPS with an SCLK of 20 MHz. TPCs 3a to 4b show the power supply rejection ratio versus AVDD supply ripple frequency for the AD7866 under different conditions. The power supply rejection ratio (PSRR) is defined as the ratio of the power in the ADC output at full-scale fre- quency f, to the power of a 100 mV sine wave applied to the ADC AVDD supply of frequency fS: PSRR dB Pf Pf S () = () 10 log Pf = power at frequency f in ADC output, and PfS = power at frequency fS coupled onto the ADC AVDD supply. Here, a 100 mV peak-to-peak sine wave is coupled onto the AVDD supply while the digital supply is left unaltered. TPCs 3a and 3b show the PSRR of the AD7866 when there is no decoupling on the supply, while TPCs 4a and 4b show the PSRR with decoupling capacitors of 10 µF and 0.1 µF on the supply. TPCs 5 and 6 show typical DNL and INL plots for the AD7866. TPC 7 shows a graph of the total harmonic distortion versus analog input frequency for various source impedances. TPC 8 shows a graph of total harmonic distortion versus analog input frequency for various supply voltages. See the Analog Input section. |
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