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[原创] Microchip MCP33131D-10 16位模数转换器(ADC)解决方案

关键词:模数转换器(ADC) 马达控制 数据采集 医疗仪器 测试测量 开关电源

时间:2019-04-18 10:48:47       来源:中电网

Microchip公司的MCP33131D-10是16位模数转换器(ADC),具有全差分输入,高性能和低功耗特性和逐次逼近(SAR)架构以及工业标准SPI串行接口,允许16位ADC能增加到任何的PIC®MCU中.此外,MCP33131D-10还具有1M取样/秒,1输入通路,低功耗(待机0.8µA,工作1.6mA),10引脚MSOP和10引脚TDFN封装,器件工作外接2.5V到5.1V基准电压(+VREF),支持从-VREF 到 +VREF满输入范围,基准电压的设定独立于模拟电源电压(AVDD),高于AVDD,而转换输出很容易通过SPI兼容的三线接口获得.器件需要1.8V模拟电源(AVDD)和1.7V-5.5V数字I/O接口电源(DVIO).主要应用在高精度数据采集,医疗仪器,马达控制,电动汽车电池管理系统,电池工作的设备,开关电源.本文介绍了MCP33131D-10主要特性,多种应用电路和包括ADM00872和ADM00873在内的评估板MCP331x1 16/14/12位1 Msps SAR ADC EVK主要特性,电路图,材料清单和PCB设计图.

The MCP33131D-10 16-bit Analog-to-Digital Converter (ADC) features a full differential input, high performance and low power consumption in a small package, making it ideal for battery powered systems and remote data acquisition applications. The MCP33131D-10 features a successive approximation register (SAR) architecture and an industry-standard SPI serial interface, allowing 16-bit ADC capability to be added to any PIC® microcontroller. The MCP33131D-10 features 1M samples/second, 1 input channel, low power consumption (0.8µA typical standby, 1.6mA typical active), and is available in 10-pin MSOP and 10-pin TDFN packages. Applications for the MCP33131D-10 include high-precision data acquisition, medical instrumentation, motor control applications, electric vehicle battery management systems, battery operated applications, switch-mode power supply applications.

The MCP33131D/MCP33121D/MCP33111D-10 and MCP33131D/MCP33121D/MCP33111D-05 arefully-differential 16, 14, and 12-bit, single-channel1 Msps and 500 kSPS ADC family devices,respectively, featuring low power consumption andhigh performance, using a successive approximationregister (SAR) architecture.

The device operates with a 2.5V to 5.1V externalreference (VREF), which supports a wide range of inputfull-scale range from -VREF to +VREF. The referencevoltage setting is independent of the analog supplyvoltage (AVDD) and is higher than AVDD. Theconversion output is available through an easy-to-usesimple SPI- compatible 3-wire interface.

The device requires a 1.8V analog supply voltage(AVDD) and a 1.7V to 5.5V digital I/O interface supplyvoltage (DVIO). The wide digital I/O interface supply(DVIO) range (1.7V – 5.5V) allows the device tointerface with most host devices (Master) available inthe current industry such as the PIC32microcontrollers, without using external voltage level shifters.

When the device is first powered-up, it performs aself-calibration to minimize offset, gain and linearityerrors. The device performance stays stable across thespecified temperature range. However, when extremechanges in the operating environment, such as in thereference voltage, are made with respect to the initialconditions (e.g. the reference voltage was not fullysettled during the initial power-up sequence), the usermay send a recalibrate command anytime to initiateanother self-calibration to restore optimum performance.

When the initial power-up sequence is completed, thedevice enters a low-current input acquisition mode,where sampling capacitors are connected to the inputpins. This mode is called Standby.During Standby, most of the internal analog circuitry isshutdown in order to reduce current consumption.

Typically, the device consumes less than 1 μA duringStandby. A new conversion is started on the rising edgeof CNVST. When the conversion is complete and thehost lowers CNVST, the output data is presented onSDO, and the device enters Standby to begin acquiringthe next input sample. The user can clock out the ADCoutput data using the SPI-compatible serial clockduring Standby.

The ADC system clock is generated by the internalon-chip clock, therefore the conversion is performedindependent of the SPI serial clock (SCLK).

This device can be used for various high-speed andhigh-accuracy analog-to-digital data conversionapplications, where design simplicity, low power, andno output latency are needed.

The device is AEC-Q100 qualified for automotive applicationsand operates over the extended temperaturerange of -40℃ to +125℃. The available packageoptions are Pb-free small 3 mm x 3 mm TDFN-10 andMSOP-10.

MCP33131D-10主要特性:

• Sample Rate (Throughput):
- MCP33131D/21D/11D-10: 1 Msps
- MCP33131D/21D/11D-05: 500 kSPS
• 16/14/12-Bit Resolution with No Missing Codes
• No Latency Output
• Wide Operating Voltage Range:
- Analog Supply Voltage (AVDD): 1.8V
- Digital Input/Output Interface Voltage (DVIO):1.7V - 5.5V
- External Reference (VREF): 2.5V - 5.1V
• Differential Input Operation
- Input Full-Scale Range: -VREF to +VREF
• Ultra Low Current Consumption (typical):
- During Input Acquisition (Standby): ~ 0.8 μA
- During Conversion:
MCP33131D/21D/11D-10: ~1.6 mA
MCP33131D/21D/11D-05: ~1.4 mA
• SPI-Compatible Serial Communication:
- SCLK Clock Rate: up to 100 MHz
• ADC Self-Calibration for Offset, Gain, andLinearity Errors:
- During Power-Up (automatic)
- On-Demand via user’s command duringnormal operation
• AEC-Q100 Qualified:
- Temperature Grade 1: -40℃to +125℃
• Package Options: MSOP-10 and TDFN-10

MCP33131D-10典型应用:

• High-Precision Data Acquisition
• Medical Instruments
• Test Equipment
• Electric Vehicle Battery Management Systems
• Motor Control Applications
• Switch-Mode Power Supply Applications
• Battery-Powered Equipment

图1.MCP33131D-10应用框图

图2.MCP33131D-10全差分输入的输入控制电路

图3.MCP33131D-10任意波形输入信号的输入控制电路

图4.MCP33131D-10单端输入信号的假差分双极输入配置电路

图5.MCP33131D-10单端输入信号的假差分单极输入配置电路

评估板MCP331x1D-XX EVK

The MCP331x1D-XX Evaluation Kit demonstrates theperformance of the MCP331x1D-XX SAR ADC familydevices. The evaluation kit includes: (a) MCP331x1D Evaluation Board, (b) PIC32MZ EF Curiosity Board fordata collection, and (c) SAR ADC Utility PC GUI. Contact Microchip Technology Inc. for the evaluationtools and the PIC32 MCU firmware example codes

图6.评估板MCP331x1D-XX EVK外形图

评估板MCP331x1 16/14/12位1 Msps SAR ADC EVK

This MCP331x1 16/14/12-Bit 1 Msps SAR ADC Evaluation Kit is a fully-assembled,programmed and tested solution to evaluate and demonstrate the MCP331x1operating performance.

评估板MCP331x1 16/14/12位1 Msps SAR ADC EVK主要特性:

• Full-Scale Analog Input Range:–VREF to +VREF
- ADM00872 with MCP33131D/21D/11D:–5 VPP to +5 VPP
- ADM00873 with MCP33131D/21D/11D:–4 VPP to +4 VPP
• Dynamic Performance Monitoring
• Evaluation of Performance Metrics, such as: SNR, SFDR, INL, DNL, and so on
• Ability to Save and Load Software Configurations
• Ability to Save and Load Raw Data for User Post-Processing

图7.评估板MCP331x1 16/14/12位1 Msps SAR ADC EVK建立图

图8.评估板MCP331x1 16/14/12位1 Msps SAR ADC EVK外形图:5V基准

图9.评估板MCP331x1 16/14/12位1 Msps SAR ADC EVK外形图:4V基准

图10.Curiosity PIC32MZEF开发板外形图(DM320104)

图11.评估板MCP331x1 16/14/12位1 Msps SAR ADC EVK(ADM00873)连接到Curiosity PIC32MZEF开发板(DM320104)

图12.ADM00872板电路图(1)

图13.ADM00872板电路图(2):稳压器
ADM00872板材料清单:






图14.ADM00872板PCB设计图:顶层丝印层

图15.ADM00872板PCB设计图:顶层铜和丝印层

图16.ADM00872板PCB设计图:顶层铜层

图17.ADM00872板PCB设计图:底层铜层

图18.ADM00872板PCB设计图:底层铜和丝印层

图19.ADM00872板PCB设计图:底丝印层

图20.ADM00873板电路图(1)

图21.ADM00873板电路图(2):稳压器
ADM00873板材料清单:




ADM00873板机械部分材料清单:


图22.ADM00873板PCB设计图:顶层丝印

图23.ADM00873板PCB设计图:顶层铜和丝印

图24.ADM00873板PCB设计图:顶层铜

图25.ADM00873板PCB设计图:底层铜

图26.ADM00873板PCB设计图:底层铜和丝印

图27.ADM00873板PCB设计图:底层丝印
详情请见:
http://59.80.44.99/ww1.microchip.com/downloads/en/DeviceDoc/MCP33131D-Data-Sheet-DS20005947B.pdf
http://59.80.44.49/ww1.microchip.com/downloads/en/DeviceDoc/MCP331x1-16-14-12-Bit-1-Msps-SAR-ADC-Evaluation-Kit-Users-Guide-DS50002733A.pdf
MCP331x1-16-14-12-Bit-1-Msps-SAR-ADC-Evaluation-Kit-Users-Guide-DS50002733A.pdf
MCP33131D-Data-Sheet-DS20005947B.pdf

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