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AD7707 Datasheet(PDF) 48 Page - Analog Devices |
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AD7707 Datasheet(HTML) 48 Page - Analog Devices |
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48 / 53 page  AD7707 Rev. B | Page 47 of 52 OUTPUT NOISE FOR HIGH LEVEL INPUT CHANNEL, AIN3 5 V OPERATION Specified high level input voltage ranges of ±10 V, ±5 V, 0 V to +10 V, and 0 V to +5 V only utilize two gain different gain settings (gains of 2 and 4) out of the eight possible settings available within the PGA. Table 31 and Table 32 show what the high level channel performance actually is over the complete range of gain settings. Table 31 shows the AD7707 output rms noise and peak-to-peak resolution for the selectable notch and −3 dB frequencies for the part, as selected by FS0, FS1, and FS2 of the clock register. The numbers are given for all input ranges with a VREF of 2.5 V, HBIAS = 2.5 V, HICOM = AGND, and AVDD = 5 V. These numbers are typical and are generated at an analog input voltage of 0 V for buffered mode of operation. Table 32 meanwhile shows the rms and peak-to-peak resolution for buffered mode of operation. It is important to note that these numbers represent the resolution for which there is no code flicker. They are not calculated based on rms noise but on peak- to-peak noise. The output noise comes from two sources. The first is the electrical noise in the semiconductor devices (device noise) used in the implementation of the modulator. Secondly, when the analog input is converted into the digital domain, quantization noise is added. The device noise is at a low level and is independent of frequency. The quantization noise starts at an even lower level but rises rapidly with increasing frequency to become the dominant noise source. The numbers in Table 31 and Table 32 are given for the bipolar input ranges. For the unipolar ranges, the rms noise numbers are the same as the bipolar range, but the peak-to-peak resolution is now based on half the signal range, which effectively means losing one bit of resolution. Table 31. AIN3, Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +5 V Unbuffered Mode Filter First Notch and Output Data Rate −3 dB Frequency Typical Output RMS Noise in μV (Peak-to-Peak Resolution) Gain of 1 Gain of 2 Gain of 4 Gain of 8 Gain of 16 Gain of 32 Gain of 64 Gain of 128 MCLK IN = 2.4576 MHz 10 Hz 2.62 Hz 10.90 (16) 5.10 (16) 3.52 (16) 2.62 (16) 2.34 (16) 2.34 (16) 2.34 (15) 2.30 (14) 50 Hz 13.1 Hz 31.34 (16) 15.82 (16) 9.77 (16) 6.00 (16) 5.12 (16) 5.36 (15) 4.84 (14) 4.75 (13) 60 Hz 15.72 Hz 36.74 (16) 20.36 (16) 12.29 (16) 7.33 (16) 5.84 (16) 5.65 (15) 5.1 (14) 5.3 (13) 250 Hz 65.5 Hz 690 (13) 430 (13) 212 (13) 100 (13) 42 (13) 30 (13) 18.5 (12) 13.8 (12) 500 Hz 131 Hz 4679 (10) 2350 (10) 1287 (10) 564 (10) 294 (10) 137 (10) 73 (10) 53 (10) Table 32. AIN3, Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +5 V Buffered Mode Filter First Notch and Output Data Rate −3 dB Frequency Typical Output RMS Noise in μV (Peak-to-Peak Resolution) Gain of 1 Gain of 2 Gain of 4 Gain of 8 Gain of 16 Gain of 32 Gain of 64 Gain of 128 MCLK IN = 2.4576 MHz 10 Hz 2.62 Hz 14.28 (16) 7.4 (16) 5.2 (16) 3.35 (16) 3.35 (16) 3.34 (15.5) 3.34 (15) 2.34 (14.5) 50 Hz 13.1 Hz 37.4 (16) 22.2 (16) 14.3 (16) 8.7 (16) 7.33 (15.5) 7.7 (14.5) 7.6 (13.5) 7.5 (12.5) 60 Hz 15.72 Hz 48.8 (16) 26.6 (16) 15.88 (16) 10.17 (16) 8.78 (15.5) 8.1 (14.5) 8.1 (13.5) 8.1 (12.5) 250 Hz 65.5 Hz 778 (12.5) 475 (13) 187 (13) 98 (13) 60 (12.5) 31.7 (12.5) 23 (12) 18.3 (11.5) 500 Hz 131 Hz 4716 (10.5) 2423 (10.5) 1097 (10.5) 551 (10.5) 288 (10.5) 150 (10) 81 (10) 49 (10) |
Similar Part No. - AD7707_17 |
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Similar Description - AD7707_17 |
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