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AD7738BRUZ-REEL7 Datenblatt(PDF) 10 Page - Analog Devices |
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AD7738BRUZ-REEL7 Datenblatt(HTML) 10 Page - Analog Devices |
10 / 28 page REV. 0 –10– AD7738 CHOPPING DISABLED The second mode, in which the AD7738 is configured with chopping disabled (CHOP = 0), provides faster conversion time while still maintaining high resolution. Tables IV to VI show the –3 dB frequencies and typical performance versus channel conversion time or equivalent output data rate, respectively. Table IV shows the typical output rms noise. Table V shows the typical effective resolution based on the rms noise. Table VI shows the typical output peak-to-peak resolution, representing values for which there will be no code flicker within a six-sigma limit. The peak-to-peak resolutions are not calculated based on rms noise, but on peak-to-peak noise. These typical numbers are generated from 4096 data samples acquired in Continuous Conversion mode with an analog input voltage set to 0 V and MCLK = 6.144 MHz. The Conversion Time is selected via the Channel Conversion Time register. Table IV. Typical Output RMS Noise in V vs. Conversion Time and Input Range with Chopping Disabled Conversion Conversion Output –3 dB Input Range Time Time Data Rate Frequency FW Register ( s) (Hz) (Hz) 2.5 V, +2.5 V 1.25 V, +1.25 V, 625 mV, +625 mV 127 7Fh 1357 737 671 2.7 1.5 92 5Ch 992 1008 917 3.0 1.8 35 23h 398 2511 2285 5.1 3.0 16 10h200 4991 2510 7.5 4.5 99h127 7847 7141 10.2 5.9 88h 117 8545 7776 11.4 6.5 33h65 15398 14013 15.5 10.3 Table V. Typical RMS Resolution in Bits vs. Conversion Time and Input Range with Chopping Disabled Conversion Conversion Output –3 dB Input Range Time Time Data Rate Frequency FW Register ( s) (Hz) (Hz) 2.5 V +2.5 V 1.25 V +1.25 V 625 mV +625 mV 127 7Fh 1357 737 671 20.8 19.8 20.6 19.6 19.6 18.6 92 5Ch 992 1008 917 20.6 19.6 20.4 19.4 19.4 18.4 35 23h 398 2511 2285 19.9 18.9 19.6 18.6 18.6 17.6 16 10h200 4991 2510 19.3 18.3 19.0 18.0 18.0 17.0 99h127 7847 7141 18.9 17.9 18.7 17.7 17.7 16.7 88h 117 8545 7776 18.7 17.7 18.5 17.5 17.5 16.5 33h65 15398 14013 18.0 16.7 17.8 17.1 17.1 16.1 Table VI. Typical Peak-to-Peak Resolution in Bits vs. Conversion Time and Input Range with Chopping Disabled Conversion Conversion Output –3 dB Input Range Time Time Data Rate Frequency FW Register ( s) (Hz) (Hz) 2.5 V +2.5 V 1.25 V +1.25 V 625 mV +625 mV 127 7Fh 1357 737 671 17.9 16.9 17.8 16.8 16.8 15.8 92 5Ch 992 1008 917 17.8 16.8 17.4 16.4 16.4 15.4 35 23h 398 2511 2285 17.0 16.0 16.8 15.8 15.8 14.8 16 10h200 4991 2510 16.3 15.3 16.2 15.2 15.2 14.2 99h127 7847 7141 16.1 15.1 15.9 14.9 14.9 13.9 88h 117 8545 7776 16.0 15.0 15.7 14.7 14.7 13.7 33h65 15398 14013 15.0 14.0 14.8 13.8 13.8 12.8 |
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