Datasheet AD7910, AD7920 (Analog Devices) - 10

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AD7910/AD7920 TYPICAL PERFORMANCE CHARACTERISTICS
Figure 7 and Figure 8 show a typical FFT plot for the AD7920 and Figure 12 shows a graph of the total harmonic distortion vs. analog AD7910, respectively, at a 250 kSPS sampling rate and a 100 kHz input frequency for different source impedances when using a input frequency. supply voltage of 3.6 V and sampling at a rate of 250 kSPS. See the Analog Input section. Figure 9 shows the signal-to-(noise + distortion) ratio performance vs. input frequency for various supply voltages while sampling at Figure 13 shows a graph of the total harmonic distortion vs. 250 kSPS with an SCLK frequency of 5 MHz for the AD7920. analog input signal frequency for various supply voltages while sampling at 250 kSPS with an SCLK frequency of 5 MHz. Figure 10 and Figure 11 show typical INL and DNL performance for the AD7920.
–5 –71.0 8192 POINT FFT VDD = 2.7V –15 f V SAMPLE = 250kSPS DD = 5.25V –71.5 fIN = 100kHz SINAD = 72.05dB THD = –82.87dB –35 SFDR = –87.24dB –72.0 VDD = 4.75V VDD = 3.6V VDD = 2.7V –55 NR (dB) S INAD (dB) S –72.5 –75 VDD = 2.35V –73.0 –95 –115 –73.5 0 25 50 75 100 125 10 100 1000 FREQUENCY (kHz) FREQUENCY (kHz)
02976-007 02976-009 Figure 7. AD7920 Dynamic Performance at 250 kSPS Figure 9. AD7920 SINAD vs. Input Frequency at 250 kSPS
15 1.0 8192 POINT FFT VDD = 2.35V V 0.8 DD = 2.35V TEMP = 25
°
C –5 fSAMPLE = 250kSPS fSAMPLE = 250kSPS f 0.6 IN = 100kHz SINAD = 61.67dB THD = –79.59dB 0.4 –25 ) SFDR = –82.93dB B 0.2 –45 0 NR (dB) S RROR (LS –0.2 –65 INL E –0.4 –0.6 –85 –0.8 –105 –1.0 0 25 50 75 100 125 0 512 1024 1536 2048 2560 3072 3584 4096 FREQUENCY (kHz)
02976-008
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02976-010 Figure 8. AD7910 Dynamic Performance at 250 kSPS Figure 10. AD7920 INL Performance Rev. C | Page 10 of 24 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS SPECIFICATIONS AD7910 AD7920 TIMING SPECIFICATIONS TIMING EXAMPLES TIMING EXAMPLE 1 TIMING EXAMPLE 2 ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY CIRCUIT INFORMATION CONVERTER OPERATION ADC TRANSFER FUNCTION TYPICAL CONNECTION DIAGRAM ANALOG INPUT DIGITAL INPUTS MODES OF OPERATION NORMAL MODE POWER-DOWN MODE POWER-UP TIME POWER VS. THROUGHPUT RATE SERIAL INTERFACE MICROPROCESSOR INTERFACING AD7910/AD7920 TO TMS320C541 INTERFACE AD7910/AD7920 TO ADSP-218x AD7910/AD7920 TO DSP563xx INTERFACE APPLICATION HINTS GROUNDING AND LAYOUT EVALUATING PERFORMANCE OUTLINE DIMENSIONS ORDERING GUIDE