ADIAD7768八路同时取样ΣΔADC解决方案Word文档格式.docx

1、The AD7768 has three modes: fast mode （256 kSPS maximum, 110.8 kHz input bandwidth, 51.5 mW per channel）, median mode （128 kSPS maximum, 55.4 kHz input bandwidth, 27.5 mW per channel） and eco mode （32 kSPS maximum, 13.8 kHz input bandwidth, 9.375 mW per channel）.The AD7768 offers extensive digital f

2、iltering capabilities, such as a wideband, low 0.005 dB pass-band ripple, antialiasing low-pass filter with sharp roll off, and 105 dB attenuation at the Nyquist frequency.Frequency domain measurements can use the wideband linear phase filter. This filter has a flat pass band （0.005 dB ripple） from

3、dc to 102.4 kHz at 256 kSPS, from dc to 51.2 kHz at 128 kSPS, or from dc to 12.8 kHz at 32 kSPS.The AD7768 also offers sinc response via a sinc5 filter, a low latency path for low bandwidth, and low noise measurements.The wideband and sinc5 filters can be selected and run on a per channel basis.With

4、in these filter options, the user can improve the dynamic range by selecting from decimation rates of 32, 64, 128, 256, 512, and 1024. The ability to vary the decimation filtering optimizes noise performance to the required input bandwidth.Embedded analog functionality on each ADC channel makes desi

5、gn easier, such as a precharge buffer on each analog input that reduces analog input current and a precharge reference buffer per channel reduces input current and glitches on the reference input terminals.The device operates with a 5 V AVDD1A and AVDD1B supply, a 2.25 V to 5.0 V AVDD2A and AVDD2B s

6、upply, and a 2.5 V to 3.3 V or 1.8 V IOVDD supply （see the 1.8 V IOVDD Operation section for specific requirements for operating at 1.8 V IOVDD）.For the purposes of clarity within this document, the AVDD1A and AVDD1B supplies are referred to as AVDD1 and the AVDD2A and AVDD2B supplies are referred t

7、o as AVDD2. For the negative supplies, AVSS is used to refer to AVSS1A, AVSS1B, AVSS2A, AVSS2B, and all other AVSS pins.The specified operating temperature range is 40 to +105. The device is housed in a 12 mm 12 mm, 64-lead LQFP package.Throughout this data sheet, multifunction pins, such as XTAL2/M

8、CLK, are referred to either by the entire pin name or by a single function of the pin, for example MCLK, when only that function is relevant.AD7768主要特性:Precision ac and dc performance8-channel simultaneous sampling256 kSPS ADC output data rate per channel108 dB dynamic range110.8 kHz input bandwidth

9、 （3 dB bandwidth （BW）120 dB THD typical2 ppm INL, 50 V offset error, 30 ppm gain errorOptimized power dissipation vs. noise vs. input bandwidthSelectable power, speed, and input bandwidthFast: highest speed; 110.8 kHz BW, 51.5 mW per channelMedian: half speed, 55.4 kHz BW, 27.5 mW per channelEco: lo

10、west power, 13.8 kHz BW, 9.375 mW per channelInput BW range: dc to 110.8 kHzProgrammable input bandwidth/sampling ratesCyclic redundancy check （CRC） error checking on data interfaceDaisy-chainingLinear phase digital filterLow latency sinc5 filterWideband brick wall filter: 0.005 dB ripple to 102.4 k

11、HzAnalog input precharge buffersPower supplyAVDD1 = 5 V, AVDD2 = 2.25 V to 5 VIOVDD = 2.5 V to 3.3 V or IOVDD = 1.8 V64-lead LQFP package, no padTemperature range: 40 to +105AD7768应用:Data acquisition systems: USB/PXI/EthernetInstrumentation and industrial control loopsAudio test and measurementVibra

12、tion and asset condition monitoring3-phase power quality analysisSonarHigh precision medical EEG/EMG/ECG图1. AD7768功能框图图2. AD7768典型连接图评估板EVAL-AD7768FMCZThe EVAL-AD7768FMCZ evaluation kit features the AD7768 24-bit, 256 kSPS, analog-to-digital converter （ADC）. A 7 V to 9 V external bench top supply is

13、 regulated to 5 V and 3.3 V to supply the AD7768 and support ponents. The EVAL-AD7768FMCZ board connects to the USB port of the PC via a connection to the EVAL-SDP-CH1Z motherboard.The AD7768 evaluation software fully configures the AD7768 device register functionality and provides dc and ac time do

14、main analysis in the form of waveform graphs, histograms, and associated noise analysis for ADC performance evaluation.The EVAL-AD7768FMCZ is an evaluation board that allows the user to evaluate the features of the ADC. The user PC software executable controls the AD7768 over USB through the EVAL-SD

15、P-CH1Z System Demonstration Platform （SDP）.Full specifications on the AD7768 are available in the product data sheet, which should be consulted in conjunction with user guide UG-917 when working with the evaluation board.评估板EVAL-AD7768FMCZ主要特点:Full featured evaluation board for the AD7768PC control

16、in conjunction with the SDP-H1 System Demonstration Platform （EVAL-SDP-CH1Z）PC software control and data analysisTime and frequency domainStandalone hardware capability图3. 评估板EVAL-AD7768FMCZ外形图图4. 评估板EVAL-AD7768FMCZ电路图（1）图5. 评估板EVAL-AD7768FMCZ电路图（2）图6. 评估板EVAL-AD7768FMCZ电路图（3）图7. 评估板EVAL-AD7768FMCZ电

17、路图（4）图8. 评估板EVAL-AD7768FMCZ电路图（5）图9. 评估板EVAL-AD7768FMCZ电路图（6）图10. 评估板EVAL-AD7768FMCZ电路图（7）图11. 评估板EVAL-AD7768FMCZ PCB设计图（1）图12. 评估板EVAL-AD7768FMCZ PCB设计图（2）图13. 评估板EVAL-AD7768FMCZ PCB设计图（3）图14. 评估板EVAL-AD7768FMCZ PCB设计图（4）图15. 评估板EVAL-AD7768FMCZ PCB设计图（5）图16. 评估板EVAL-AD7768FMCZ PCB设计图（6）图17. 评估板EVAL

18、-AD7768FMCZ PCB设计图（7）图18. 评估板EVAL-AD7768FMCZ PCB设计图（8）c:iknowdocsharedatacur_work.aoelectronicsc:iknowdocsharedatacur_work.aoelectronicsmain.phpc:iknowdocsharedatacur_work.aoelectronicsiknowdocsharedatacur_work.aoelectronicsmanufacturers-detail.php?tnid=131c:tnid=134c:tnid=182c:tnid=209c:tnid=208c:tnid=188c:tnid=216c:tnid=236c:tnid=258c:tnid=270