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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 / 52 page  AD7707 Rev. B | Page 48 of 52 3 V OPERATION Table 33 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 1.25 V, HBIAS = 1.25 V, HICOM = AGND, and AVDD = 3 V. These numbers are typical and are generated at an analog input voltage of 0 V for unbuffered mode of operation. Table 34 meanwhile shows the output rms noise and peak-to-peak resolution for buffered mode of operation with the same operating conditions as for Table 33. 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 33 and Table 34 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 33. AIN3, Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +3 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 12.4 (16) 7.02 (16) 3.87 (16) 2.41 (16) 2.39 (16) 2.3 (15.5) 2.29 (14.5) 2.13 (13.5) 50 Hz 13.1 Hz 30.35 (16) 16.4 (16) 9.4 (16) 5.85 (16) 5.2 (15) 4.5 (14.5) 4.5 (13.5) 5.09 (12) 60 Hz 15.72 Hz 34.55 (16) 19.13 (16) 10.9 (16) 6 (16) 5.8 (15) 5.62 (14) 5.2 (13) 6.14 (12) 250 Hz 65.5 Hz 498 (13) 204 (13) 105 (13) 57.5 (13) 27.5 (13) 17.4 (12.5) 12.7 (12) 11.42 (11) 500 Hz 131 Hz 2266 (10.5) 1151 (10.5) 554 (10.5) 280 (10.5) 136 (10.5) 83 (10) 39 (10) 27.5 (9.5) Table 34. AIN3, Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +3 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 14.84 (16) 8.39 (16) 5.56 (16) 3.45 (16) 3.3 (16) 3.2 (15) 3.2 (14) 3.3 (13) 50 Hz 13.1 Hz 36.1 (16) 18.8 (16) 11.5 (16) 7.5 (15.5) 7.4 (14.5) 7.43 (13.5) 6.8 (12.5) 7 (12) 60 Hz 15.72 Hz 38.8 (16) 21.55 (16) 13.39 (16) 8.5 (15.5) 8.36 (14.5) 8 (13.5) 8.2 (12.5) 7.7 (12) 250 Hz 65.5 Hz 420 (13) 194 (13) 97.6 (13) 54.5 (12.5) 30 (12.5) 22 (12) 18 (11.5) 16.7 (10.5) 500 Hz 131 Hz 2234 (10.5) 1231 (10.5) 534 (10.5) 275 (10.5) 145 (10.5) 71 (10.5) 48 (10) 31 (9.5) |
Similar Part No. - AD7707_15 |
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Similar Description - AD7707_15 |
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