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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 / 52 page  AD7707 Rev. B | Page 17 of 52 OUTPUT NOISE FOR HIGH LEVEL INPUT CHANNEL AIN3 (3 V OPERATION) Table 13 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 given are for the ±5 V, 0 V to 5 V and 0 V to 10 V ranges with a VREF of 1.225 V, VBIAS = 1.225 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. The ±5 V, 0 V to 5 V, and 0 V to 10 V operating ranges are only achievable in unbuffered mode when operating at 3 V due to common-mode limitations on the input amplifier. It is important to note that these numbers represent the resolution for which there are no code flicker. They are not calculated based on rms noise but on peak-to-peak noise. Operating at a gain of 1 in unipolar mode provides a range of 0 V to +10 V. Operating the high level channel with a gain of 2 in bipolar mode provides a ±5 V operating range. Operating at a gain of 2 in unipolar mode provides an operating range of 0 V to 5 V. 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, quantiza- tion 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 13 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 13. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +3 V AIN3 Unbuffered Mode Only Filter First Notch and Output Data Rate −3 dB Frequency 0 V to 10 V Range ±5 V Range 0 to 5 V Range RMS Noise P-P (Bits) RMS Noise P-P (Bits) RMS Noise P-P (Bits) (μV) Resolution (μV) Resolution (μV) Resolution MCLK IN = 2.4576 MHz 10 Hz 2.62 Hz 12.4 16 7.02 16 7.02 16 50 Hz 13.1 Hz 30.35 16 16.4 16 16.4 15.5 60 Hz 15.72 Hz 34.55 16 19.13 16 19.13 15 250 Hz 65.5 Hz 498 12.5 204 13 204 12 500 Hz 131 Hz 2266 10.5 1151 10.5 1151 9.5 MCLK IN = 1 MHz 4.05 Hz 1.06 Hz 13.9 16 7.3 16 7.3 16 20 Hz 5.24 Hz 32.2 16 17.4 16 17.4 15 25 Hz 6.55 Hz 33.4 16 18.57 16 18.57 15 100 Hz 26.2 Hz 430 13 200 13 200 12 200 Hz 52.4 Hz 2207 10.5 1048 10.5 1048 9.5 |
Similar Part No. - AD7707_15 |
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Similar Description - AD7707_15 |
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