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AD7707 데이터시트(PDF) 10 Page - Analog Devices |
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AD7707 데이터시트(HTML) 10 Page - Analog Devices |
10 / 40 page REV. A AD7707 –10– Table IV. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +3 V AIN1 and AIN2 Buffered Mode Only Filter First Typical Output RMS Noise in V (Peak-to-Peak Resolution in Bits) Notch and O/P –3 dB Gain of Gain of Gain of Gain of Gain of Gain of Gain of Gain of Data Rate Frequency 1 2 4 8 16 32 64 128 MCLK IN = 2.4576 MHz 10 Hz 2.62 Hz 1.80 (16) 1 (16) 0.7 (16) 0.41 (16) 0.41 (16) 0.41 (15) 0.41 (14) 0.41 (13) 50 Hz 13.1 Hz 4.1 (16) 2.4 (16) 1.5 (16) 1 (15.5) 0.91 (15) 0.89 (14) 0.86 (13) 0.83 (12) 60 Hz 15.72 Hz 5.1 (16) 3 (16) 1.8 (16) 1.1 (15.5) 0.94 (14.5) 0.94 (13.5) 0.99 (13) 0.99 (11.5) 250 Hz 65.5 Hz 50 (13) 27 (13) 12.3 (13) 6.4 (13) 4 (12.5) 2.7 (12.5) 2.2 (11.5) 1.8 (11) 500 Hz 131 Hz 275 (10.5) 125 (10.5) 80 (10.5) 39 (10.5) 16 (10.5) 8.9 (10.5) 5.2 (10) 4.2 (9.5) MCLK IN = 1 MHz 4.05 Hz 1.06 Hz 1.75 (16) 1.18 (16) 0.67 (16) 0.44 (16) 0.41 (16) 0.44 (15) 0.43 (14) 0.43 (13) 20 Hz 5.24 Hz 4.21 (16) 2.5 (16) 1.48 (16) 1 (15.5) 0.94 (15) 0.96 (14) 0.89 (13) 0.86 (12) 25 Hz 6.55 Hz 5.15 (16) 2.8 (16) 1.8 (16) 1.15 (15.5) 1 (14.5) 1.02 (13.5) 0.96 (13) 1.03 (11.5) 100 Hz 26.2 Hz 46.1 (13) 24.3 (13) 13.6 (13) 6.71 (13) 4.1 (12.5) 2.54 (12.5) 2.3 (11.5) 2.15 (10.5) 200 Hz 52.4 Hz 282 (10.5) 123 (10.5) 66 (10.5) 35.3 (10.5) 14.8 (10.5) 9.91 (10.5) 5.48 (10) 4.01 (9.5) OUTPUT NOISE FOR HIGH LEVEL INPUT CHANNEL AIN3 (5 V OPERATION) Table V shows the AD7707 output rms noise and peak-to-peak resolution in unbuffered 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 V REF 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. Table VI 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 will be 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 Appendix 1. The out- put 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 V. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +5 V AIN3 Unbuffered Mode Only F ilter First 10 V Range 5 V Range 0 V to +10 V Range 0 V 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 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 |
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