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AD7707 Datasheet(PDF) 17 Page - Analog Devices |
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AD7707 Datasheet(HTML) 17 Page - Analog Devices |
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17 / 53 page  AD7707 Rev. B | Page 16 of 52 OUTPUT NOISE FOR HIGH LEVEL INPUT CHANNEL AIN3 (5 V OPERATION) Table 11 shows the AD7707 output rms noise and peak-to-peak resolution in unbuffered mode for the selectable notch and −3 dB frequencies for the part, as selected by FS0, FS1, and FS2 of the clock register. The numbers given are for the ±10 V, ±5 V, 0 to 5 V and 0 V to 10 V ranges with a VREF of 2.5 V, VBIAS = 2.5 V, HICOM = AGND, and AVDD = 5 V. These numbers are typical and are generated at an analog input voltage of 0 V. Table 12 meanwhile shows the output rms noise and peak-to-peak resolution in buffered mode. 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. Operating the high level channel with a gain of 2 in bipolar mode gives an operating range of ±10 V. Operating at a gain of 2 in unipolar mode gives a range of 0 V to +10 V. Operating the high level channel with a gain of 4 in bipolar mode gives the ±5 V operating range. Operating at a gain of 4 in unipolar mode gives an operating range of 0 V to 5 V. Noise for all input ranges is shown in Output Noise For High Level Input Channel, AIN3 section. 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 modula- tor. 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 11 and Table 12 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 1 bit of resolution. Table 11. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 5 V AIN3 Unbuffered Mode Only Filter First Notch and Output Data Rate −3 dB Frequency ±10 V Range ±5 V Range 0 V to 10 V Range 0 V to 5 V Range RMS Noise (μV) P-P (Bits) Resolution RMS Noise (μV) P-P (Bits) Resolution RMS Noise (μV) P-P (Bits) Resolution RMS Noise (μV) P-P (Bits) Resolution MCLK IN = 2.4576 MHz 10 Hz 2.62 Hz 5.10 16 3.52 16 5.10 16 3.52 16 50 Hz 13.1 Hz 15.82 16 9.77 16 15.82 16 9.77 16 60 Hz 15.72 Hz 20.36 16 12.29 16 20.36 16 12.29 16 250 Hz 65.5 Hz 430 13 212 13 430 12 212 12 500 Hz 131 Hz 2350 10 1287 10 2350 9 1287 9 MCLK IN = 1 MHz 4.05 Hz 1.06 Hz 5.13 16 3.53 16 5.13 16 3.53 16 20 Hz 5.24 Hz 18.9 16 13.25 16 18.9 16 13.25 16 25 Hz 6.55 Hz 23.7 16 15.3 16 23.7 16 15.3 15.5 100 Hz 26.2 Hz 406 13 174 13 406 12 174 12 200 Hz 52.4 Hz 2184 10.5 1144 10.5 2184 9.5 1144 9.5 Table 12. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 5 V AIN3 Buffered Mode Only Filter First Notch and Output Data Rate −3 dB Frequency ±10 V Range ±5 V Range 0 V to 10 V Range 0 to 5 V Range RMS Noise P-P (Bits) RMS Noise P-P (Bits) RMS Noise P-P (Bits) RMS Noise P-P (Bits) (μV) Resolution (μV) Resolution (μV) Resolution (μV) Resolution MCLK IN = 2.4576 MHz 10 Hz 2.62 Hz 7.4 16 5.2 16 7.4 16 5.2 16 50 Hz 13.1 Hz 22.2 16 14.3 16 22.2 16 14.3 16 60 Hz 15.72 Hz 26.6 16 15.85 16 26.6 16 15.85 16 250 Hz 65.5 Hz 475 13 187 13 475 12 187 12 500 Hz 131 Hz 2423 10.5 1097 10.5 2423 9.5 1097 9.5 MCLK IN = 1 MHz 4.05 Hz 1.06 Hz 7.63 16 5.45 16 7.63 16 5.45 16 20 Hz 5.24 Hz 20.25 16 13.3 16 20.25 16 13.3 16 25 Hz 6.55 Hz 23.5 16 14.6 16 23.5 16 14.6 15.5 100 Hz 26.2 Hz 377 13 210 13 377 12 210 12 200 Hz 52.4 Hz 2226 10.5 1132 10.5 2226 9.5 1132 9.5 |
Similar Part No. - AD7707_17 |
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Similar Description - AD7707_17 |
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