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AD7739BRU Datasheet(PDF) 11 Page - Analog Devices |
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AD7739BRU Datasheet(HTML) 11 Page - Analog Devices |
11 / 32 page Data Sheet AD7739 Rev. A | Page 11 of 32 OUTPUT NOISE AND RESOLUTION SPECIFICATION The AD7739 can be operated with chopping enabled or disabled, allowing the ADC to be programmed to optimize either the offset drift performance or the throughput rate and channel switching time. Noise tables for these two primary modes of operation are outlined below for a selection of output rates and settling times. The AD7739 noise performance depends on the selected chopping mode, the filter word (FW) value, and the selected analog input range. The AD7739 noise does not vary significantly with MCLK frequency. CHOPPING ENABLED The first mode, in which the AD7739 is configured with chopping enabled (chop = 1), provides very low noise with lower output rates. Table 5 to Table 7 show the −3 dB frequencies and typical performance versus the channel conversion time and equivalent output data rate, respectively. Table 5 shows the typical output rms noise. Table 6 shows the typical effective resolution based on rms noise. Table 7 shows the typical output peak-to-peak resolution, representing values for which there is no code flicker within a 6-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 5. 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) Input Range/RMS Noise (µV) ±2.5 V, +2.5 V ±1.25 V, +1.25 V, ±0.625 V, +0.625 V 127 0xFF 2689 372 200 1.8 1.1 46 0xAE 1001 999 500 2.7 1.7 17 0x91 397 2519 1325 4.8 2.7 10 0x8A 251 3982 2209 9.3 4.7 9 0x89 230 4342 2450 10.8 6.3 2 0x82 84 11838 9500 600 460 Table 6. 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) ±2.5 V +2.5 V ±1.25 V +1.25 V ±0.625 V +0.625 V 127 0xFF 2689 372 200 21.4 20.4 21.2 20.2 20.2 19.2 46 0xAE 1001 999 500 20.8 19.8 20.5 19.5 19.5 18.5 17 0x91 397 2519 1325 20.0 19.0 19.8 18.8 18.8 17.8 10 0x8A 251 3982 2209 19.0 18.0 19.0 18.0 18.0 17.0 9 0x89 230 4342 2450 18.8 17.8 18.6 17.6 17.6 16.6 2 0x82 84 11838 9500 12.9 11.9 12.4 11.4 11.4 10.4 Table 7. 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) ±2.5 V +2.5 V ±1.25 V +1.25 V ±0.625 V +0.625 V 127 0xFF 2689 372 200 18.6 17.6 18.3 17.3 17.3 16.3 46 0xAE 1001 999 500 17.9 16.9 17.6 16.6 16.6 15.6 17 0x91 397 2519 1325 17.1 16.1 16.9 15.9 15.9 14.9 10 0x8A 251 3982 2209 16.2 15.2 16.2 15.2 15.2 14.2 9 0x89 230 4342 2450 16.0 15.0 15.8 14.8 14.8 13.8 2 0x82 84 11838 9500 10.7 0.7 9.7 8.7 8.7 7.7 |
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