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AD7707BRU Scheda tecnica(PDF) 11 Page - Analog Devices |
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AD7707BRU Scheda tecnica(HTML) 11 Page - Analog Devices |
11 / 40 page REV. A AD7707 –11– Table VI. Output RMS Noise/ Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +5 V AIN3 Buffered Mode Only Filter First 10 V Range 5 V Range 0 V to +10 V Range 0 to +5 V Range Notch and O/P –3 dB RMS Noise P-P (Bits) RMS Noise P-P (Bits) RMS Noise P-P (Bits) RMS Noise P-P (Bits) Data Rate Frequency ( V) Resolution ( V) Resolution ( V) Resolution ( V) 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 OUTPUT NOISE FOR HIGH LEVEL INPUT CHANNEL AIN3 (5 V OPERATION) Table VII 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, HBIAS = 1.225 V, HICOM = AGND and AVDD = 3 V. These numbers are typical and are gener- ated at an analog input voltage of 0 V for unbuffered mode of operation. The above operating ranges are only achievable in unbuf- fered 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 will be 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, 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 the tables are given for the bipolar input ranges. For the unipolar ranges the rms noise numbers will be 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 VII. Output RMS Noise/ Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +3 V AIN3 Unbuffered Mode Only Filter First 0 V to +10 V Range 5 V Range 0 to +5 V Range Notch and O/P –3 dB RMS Noise P-P (Bits) RMS Noise P-P (Bits) RMS Noise P-P (Bits) Data Rate Frequency ( V) Resolution ( V) Resolution ( V) 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 |
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