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1、ADI AD71762高速高分辨率模数转换(ADC)解决方案时间：2015-03-27 09:52:12 作者：ADI 来源：中电网ADI公司的AD7176-2是适用于低带宽输入信号的高速高精度高分辨率-模数转换器(ADC),每路取样频率50kSPS(设定时间20us),输出数据速率5 SPS到250 kSPS,低速时分辨率增加,主要用在过程控制中的PLC/DCS模块,温度和压力测量,医疗和科学仪表以及色层分析.本文介绍了AD7176-2主要特性,功能框图,典型应用电路,以及评估板EVAL-AD7176-2SDZ主要特性,框图,电路图,材料清单和PCB设计文件图.The AD7176-2 is
2、 a fast settling, highly accurate, high resolution, multiplexed - analog-to-digital converter (ADC) for low band-width input signals. Its inputs can be configured as two fully differential or four pseudo differential inputs via the integrated crosspoint multiplexer. An integrated precision, 2.5 V, l
3、ow drift (2 ppm/), band gap internal reference (with an output reference buffer) adds functionality and reduces the external component count.The maximum channel scan data rate is 50 kSPS/channel (settling time of 20 s), resulting in fully settled data with 17 noise free bits. User-selectable output
4、data rates range from 5 SPS to 250 kSPS. The resolution increases at lower speeds.The AD7176-2 offers three key digital filters. The fast settling sinc5 + sinc1 filter maximizes the channel scan rate. The sinc3 filter maximizes the resolution for single-channel, low speed applications. For 50 Hz and
5、 60 Hz environments, the AD7176-2 specific filter minimizes the settling times or maximizes the rejection of the line frequency. These enhanced filters enable simultaneous 50 Hz and 60 Hz rejection with a 27 SPS output data rate (with a settling time of 36 ms).System offset and gain errors can be co
6、rrected on a per channel basis. This per channel configurability extends to the output data rate used for each channel when using a sinc5 + sinc1 filter. All switching of the crosspoint multiplexer is controlled by the ADC and can be configured to automatically control an external multiplexer via th
7、e GPIO pins.The specified operating temperature range is 40 to +105. The AD7176-2 is housed in a 24-lead TSSOP package.AD7176-2主要特性:Fast and flexible output rate5 SPS to 250 kSPSFast settling time20 sChannel scan data rate of 50 kSPS/channelPerformance specifications17 noise free bits at 250 kSPS20
8、noise free bits at 2.5 kSPS22 noise free bits at 5 SPSINL 2.5 ppm of FSR85 dB rejection of 50 Hz and 60 Hz with 50 ms settlingUser-configurable input channels2 fully differential or 4 pseudo differentialCrosspoint multiplexerOn-chip 2.5 V reference (drift 2 ppm/)Internal oscillator, external crystal
9、, or external clockPower supplySingle supply: 5 V AVDD1,2 V to 5 V AVDD2 and IOVDDOptional split supply: AVDD1 and AVSS 2.5 VCurrent: 7.8 mATemperature range: 40 to +1053- or 4-wire serial digital interface (Schmitt trigger on SCLK)CRC error checkingSPI, QSPI, MICROWIRE, and DSP compatibleAD7176-2应用
10、:Process control: PLC/DCS modulesTemperature and pressure measurementMedical and scientific multichannel instrumentationChromatography图1. AD7176-2功能框图图2. AD7176-2典型应用电路评估板EVAL-AD7176-2SDZThe EVAL-AD7176-2SDZ evaluation kit features the AD7176-2 24-bit, 250 kSPS analog-to-digital converter (ADC). A 7
11、 V to 9 V external bench top supply is regulated to 5 V and 3.3 V to supply the AD7176-2 and support all necessary components. The EVAL-AD7176-2SDZ board connects to the USB port of the PC by connection to the EVAL-SDP-CB1Z motherboard.The EVAL-AD7176-2SDZ software fully configures the AD7176-2 devi
12、ce register functionality and provides dc time domain analysis in the form of waveform graphs, histograms, and associated noise analysis for ADC performance evaluation.The EVAL-AD7176-2SDZ is an evaluation board that is designed to allow the user to evaluate the features of the ADC. The user PC soft
13、ware executable controls the AD7176-2 over the USB through the system demonstration platform board (EVAL-SDP-CB1Z).评估板EVAL-AD7176-2SDZ主要特性:Full featured evaluation board for the AD7176-2PC control in conjunction with the system demonstration platform (EVAL-SDP-CB1Z)PC software for control and data a
14、nalysis (time domain)Standalone capabilityONLINE RESOURCESEvaluation Kit ContentsEVAL-AD7176-2SDZ evaluation boardEvaluation software CD for the AD7176-2Documents NeededAD7176-2 data sheetEVAL-AD7176-2SDZ (UG-478) user guideRequired SoftwareEVAL-AD7176-2SDZ evaluation softwareEQUIPMENT NEEDEDEVAL-AD
15、7176-2SDZ evaluation boardEVAL-SDP-CB1Z system demonstration platformExternal 7 V to 9 V power supplyDC signal sourceUSB cablePC running Windows with USB 2.0 port图3. 评估板EVAL-AD7176-2SDZ框图图4. 评估板EVAL-AD7176-2SDZ硬件连接图图5. 评估板EVAL-AD7176-2SDZ电路图(1)图6. 评估板EVAL-AD7176-2SDZ电路图(2)图7. 评估板EVAL-AD7176-2SDZ电路图(3)图8. 评估板EVAL-AD7176-2SDZ电路图(4)图9. 评估板EVAL-AD7176-2SDZ电路图(5)评估板EVAL-AD7176-2SDZ材料清单:图10. 评估板EVAL-AD7176-2SDZ PCB设计图(1)图11. 评估板EVAL-AD7176-2SDZ PCB设计图(2):顶层图12. 评估板EVAL-AD7176-2SDZ PCB设计图(3):底层图12
