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AD7734BRU Arkusz danych(PDF) 11 Page - Analog Devices |
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AD7734BRU Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 33 page AD7734 Data Sheet Rev. B | Page 10 of 32 OUTPUT NOISE AND RESOLUTION SPECIFICATION The AD7734 can be operated with chopping enabled or disabled, allowing the ADC to be programmed either to optimize the throughput rate and channel switching time or to optimize the offset drift performance. Noise tables for these two primary modes of operation are outlined below for a selection of output rates and settling times. The AD7734 noise performance depends on the selected chopping mode, the filter word (FW) value, and the selected analog input range. The AD7734 noise will not vary significantly with MCLK frequency. CHOPPING ENABLED The first mode, in which the AD7734 is configured with chopping enabled (CHOP = 1), provides very low noise with lower output rates. Table 4 to Table 6 show the –3 dB frequencies and typical performance versus the channel conversion time and equivalent output data rate, respectively. Table 4 shows the typical output rms noise. Table 5 shows the typical effective resolution based on rms noise. Table 6 shows the typical output peak-to-peak resolution, representing values for which there will be no code flicker within a 6 Σ 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 4. Typical Output RMS Noise in µV vs. Conversion Time and Input Range with Chopping Enabled FW Conversion Time Register Conversion Time (µs) Output Data Rate (Hz) –3 dB Frequency (Hz) RMS Noise (µV) 127 FFh 2686 372 200 9.6 46 AEh 999 1001 520 15.5 22 96h 499 2005 1040 22.7 17 91h 395 2534 1300 26.1 8 88h 207 4826 2500 39.2 6 86h 166 6041 3100 46.0 2 82h 82 12166 6300 120.0 Table 5. Typical Effective Resolution in Bits vs. Conversion Time and Input Range with Chopping Enabled FW Conversion Time Register Conversion Time (µs) Output Data Rate (Hz) –3 dB Frequency (Hz) Input Range/Effective Resolution (Bits) ±10 V 0 V to +10 V ±5 V 0 V to +5 V 127 FFh 2686 372 200 21.0 20.0 20.0 19.0 46 AEh 999 1001 520 20.3 19.3 19.3 18.3 22 96h 499 2005 1040 19.7 18.7 18.7 17.7 17 91h 395 2534 1300 19.5 18.5 18.5 17.5 8 88h 207 4826 2500 19.0 18.0 18.0 17.0 6 86h 166 6041 3100 18.7 17.7 17.7 16.7 2 82h 82 12166 6300 17.3 16.3 16.3 15.3 Table 6. Typical Peak-to-Peak Resolution in Bits vs. Conversion Time and Input Range with Chopping Enabled FW Conversion Time Register Conversion Time (µs) Output Data Rate (Hz) –3 dB Frequency (Hz) Input Range/Peak-to-Peak Resolution (Bits) ±10 V 0 V to +10 V ±5 V 0 V to +5 V 127 FFh 2686 372 200 18.1 17.1 17.1 16.1 46 AEh 999 1001 520 17.4 16.4 16.4 15.4 22 96h 499 2005 1040 16.9 15.9 15.9 14.9 17 91h 395 2534 1300 16.7 15.7 15.7 14.7 8 88h 207 4826 2500 16.2 15.2 15.2 14.2 6 86h 166 6041 3100 15.8 14.8 14.8 13.8 2 82h 82 12166 6300 15.0 13.4 13.4 12.4 |
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