Datasheet AD7720 (Analog Devices) - 9

AD7720–Typical Characteristics (AVDD = DVDD = 5.0 V, TA = +25
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C; CLKIN = 12.5 MHz, AIN = 20 kHz, Bipolar Mode; VIN(+) = 0 V to 2.5 V, VIN(–) = 1.25 V unless otherwise noted) 110 84 –85 85 100 –90 AIN = 1/5 · BW 86 SNR 90 –95 87 SFDR 80 dB dB 88 dB –100 S/ (N+D) 89 70 –105 90 SFDR 60 –110 91 THD 50 92 –115 –40 –30 –20 –10 0 0 50 100 150 200 250 300 0 20 40 60 80 100 INPUT LEVEL – dB OUTPUT DATA RATE – kSPS INPUT FREQUENCY – kHz
Figure 5. S/(N+D) and SFDR vs. Figure 6. S/(N+D) vs. Output Sample Figure 7. SNR, THD, and SFDR vs. Analog Input Level Rate Input Frequency
–85 84 92.0 85 91.5 –90 AIN = 1/5 · BW SNR 86 V 91.0 V IN (+) = VIN(–) = 1.25Vpk–pk IN (+) = VIN(–) = 1.25Vpk–pk V –95 V CM = 2.5V CM = 2.5V 87 90.5 THD dB –100 90.0 dB 88 dB 89 89.5 –105 90 89.0 SFDR –110 91 88.5 –115 92 88.0 0 20 40 60 80 100 0 50 100 150 200 250 300 –50 0 50 100 INPUT FREQUENCY – kHz OUTPUT DATA RATE – kSPS TEMPERATURE –
°
C
Figure 8. SNR, THD, and SFDR vs. Figure 9. S/(N+D) vs. Output Sample Figure 10. SNR vs. Temperature Input Frequency Rate
–94 5000 1.0 –96 4500 0.8 THD –98 V 4000 IN(+) = VIN(–) 0.6 CLKIN = 12.5MHz –100 3500 8k SAMPLES 0.4 –102 3000 0.2 3RD –104 0 dB 2500 –106 4TH 2000 –0.2 –108 1500 DNL ERROR – LSB –0.4 –110 –0.6 –112 1000 FREQUENCY OF OCCURENCE –114 500 –0.8 2ND –116 0 –1.0 –50 –25 0 25 50 75 100 n–3 n–2 n–1 n n+1 n+2 n+3 0 20000 40000 65535 TEMPERATURE –
°
C CODES CODE
Figure 11. THD vs. Temperature Figure 12. Histogram of Output Codes Figure 13. Differential Nonlinearity with DC Input –8– REV. 0