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AD7731 데이터시트(PDF) 10 Page - Analog Devices |
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AD7731 데이터시트(HTML) 10 Page - Analog Devices |
10 / 44 page AD7731 –10– REV. 0 OUTPUT NOISE AND RESOLUTION SPECIFICATION The AD7731 has a number of different modes of operation of the on-chip filter and chopping features. These options are discussed in more detail in later sections. The part can be programmed either to optimize the throughput rate and settling time or to optimize noise and drift performance. Noise tables for two of the primary modes of operation of the part are outlined below for a selection of output rates and settling times. The first mode, where the AD7731 is configured with CHP = 0 and SKIP mode enabled, provides fast settling time while still maintaining high resolution. The second mode, where CHP = 1 and the full second filter is included, provides very low noise numbers with lower output rates. Settling time refers to the time taken to get an output that is 100% settled to the new value after a channel change or exercising SYNC. Output Noise (CHP = 0, SKIP = 1) Table I shows the output rms noise for some typical output update rates and –3 dB frequencies for the AD7731 when used in nonchop mode (CHP of Filter Register = 0) and with the second filter bypassed (SKIP of Filter Register = 1). The table is generated with a master clock frequency of 4.9152 MHz. These numbers are typical and generated at a differential analog input voltage of 0V. The output update rate is selected via the SF0 to SF11 bits of the Filter Register. Table II, meanwhile, shows the output peak-to- peak resolution in bits (rounded to the nearest 0.5 LSB) for the same output update rates. It is important to note that the numbers in Table II represent the resolution for which there will be no code flicker within a six-sigma limit. They are not calculated based on rms noise but on peak-to-peak noise. The numbers are generated for the bipolar input ranges. When the part is operated in unipolar mode, the output noise will be the same as the equivalent bipolar input range. As a result, the numbers in Table I will remain the same for unipolar ranges. To calculate the numbers for Table II for unipolar input ranges simply subtract one from the peak-to-peak resolution number in bits. Table I. Output Noise vs. Input Range and Update Rate (CHP = 0, SKIP = 1) Typical Output RMS Noise in V Output –3 dB SF Settling Input Range Data Rate Frequency Word Time 1.28 V 640 mV 320 mV 160 mV 80 mV 40 mV 20 mV 150 Hz 39.3 Hz 2048 20 ms 2.6 1.45 0.87 0.6 0.43 0.28 0.2 200 Hz 52.4 Hz 1536 15 ms 3.0 1.66 1.02 0.69 0.48 0.32 0.22 300 Hz 78.6 Hz 1024 10 ms 3.7 2 1.26 0.84 0.58 0.41 0.28 400 Hz 104.8 Hz 768 7.5 ms 4.2 2.3 1.46 1.0 0.69 0.46 0.32 600 Hz 157 Hz 512 5 ms 5.2 2.9 1.78 1.2 0.85 0.58 0.41 800 Hz 209.6 Hz 384 3.75 ms 6 3.3 2.1 1.4 0.98 0.66 0.47 1200 Hz 314 Hz 256 2.5 ms 7.8 4.3 2.6 1.8 1.27 0.82 0.57 1600 Hz 419.2 Hz 192 1.87 ms 10.9 5.4 3.5 2.18 1.51 0.94 0.64 2400 Hz 629 Hz 128 1.25 ms 27.1 13.9 7.3 3.5 2.22 1.24 0.83 3200 Hz 838.4 Hz 96 0.94 ms 47 24.4 11.4 5.3 3.1 1.9 1.0 4800 Hz 1260 Hz 64 0.625 ms 99 50.3 24.5 12.5 6.5 3.3 1.7 6400 Hz 1676 Hz 48 0.47 ms 193 97 48 24 11.8 6.6 3.0 Table II. Peak-to-Peak Resolution vs. Input Range and Update Rate (CHP = 0, SKIP = 1) Peak-to-Peak Resolution in Bits Output –3 dB SF Settling Input Range Data Rate Frequency Word Time 1.28 V 640 mV 320 mV 160 mV 80 mV 40 mV 20 mV 150 Hz 39.3 Hz 2048 20 ms 17.5 17 17 16.5 16 15.5 15 200 Hz 52.4 Hz 1536 15 ms 17 17 16.5 16.5 16 15.5 15 300 Hz 78.6 Hz 1024 10 ms 17 16.5 16.5 16 15.5 15 14.5 400 Hz 104.8 Hz 768 7.5 ms 16.5 16.5 16 15.5 15.5 15 14.5 600 Hz 157 Hz 512 5 ms 16.5 16 16 15.5 15 14.5 14 800 Hz 209.6 Hz 384 3.75 ms 16 16 15.5 15 14.5 14.5 14 1200 Hz 314 Hz 256 2.5 ms 15.5 15.5 15.5 15 14.5 14 13.5 1600 Hz 419.2 Hz 192 1.87 ms 15 15.5 15 14.5 14 14 13.5 2400 Hz 629 Hz 128 1.25 ms 14 14 14 14 13.5 13.5 13 3200 Hz 838.4 Hz 96 0.94 ms 13 13 13 13 13 13 12.5 4800 Hz 1260 Hz 64 0.625 ms 12 12 12 12 12 11.5 12 6400 Hz 1676 Hz 48 0.47 ms 11 11 11 11 11 11 11 |
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