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AD7984 bảng dữ liệu(PDF) 9 Page - Analog Devices |
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AD7984 bảng dữ liệu(HTML) 9 Page - Analog Devices |
9 / 12 page Circuit Note CN-0269 Rev. 0 | Page 9 of 12 Histogram Test Results Figure 16 shows the results of a 10,000 sample histogram taken by shorting the 16 single-ended channels together and connecting them to the GND of the PCB. Note that the peak-to-peak noise is approximately 12 LSBs, including the input buffer. Figure 16. DC Histogram at 0 V Input, 1 MSPS Sampling Rate, 10,000 Samples AC Test Results The ac performance was tested at the system level with the AD7984 sampling at 300 kSPS with 2.5 V p-p 10.675 kHz input sine wave signal provided by a Type 1051 B&K sine generator,. The circuit was sampling continuously on Channel 4, and does not include the effects of the input buffer. The FFT shows an SNR = 91.33 dBFS. Figure 17. FFT with a Kaiser Window (Parameter = 20), 2.5 V p-p 10.675 kHz Input, 300 kSPS Sampling Rate on CH4 Without Input Buffer Switching Speed and Settling Time Test Results The follow figures show the settling performance. The lab test setup is shown in Figure 18. Figure 18. Switching Speed and Settling Time Lab Test Setup The CN-0269 evaluation board was configured in the 16- channel singled input mode, the 8 odd channels were shorted together, and the 8 even channels were shorted together. A battery stack was used to generate the different dc input voltages for low noise and low impedance. The odd and even channels were connected to different voltages. The LabVIEWTM software controls the EVAL-SDP- CB1Z channel-to-channel and switches continually between the input channels. The switching rate was varied from 100 Hz to 1 MHz in 1 kHz increments. There were 10 samples taken at each switching rate, and the results averaged. The average value at the lowest switching rate was used as a reference point. The error at each different switching rate was calculated by taking the difference between the 10-sample and the reference value. The test results are shown in Figure 19 to Figure 23. In the figures, an error of 2 LSBs corresponds to 17-bit settling, and an error of 4 LSBs corresponds to 16-bit settling. SHORTING CABLE B & K TYPE 1051 SINE GENERATOR TRIPLE DC POWER SUPPLY AGILENT E3631A EVAL-SDP-CB1Z EVAL-CN0269-SDPZ 1.5V BATTERY STACK |
Số phần tương tự - AD7984 |
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Mô tả tương tự - AD7984 |
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