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[原创] Microchip MCP3564八路53.6 kSPS 24位Delta-Sigma ADC解决方案

关键词:Delta-Sigma AD 工厂自动化 过程控制 测试测量 压力传感器

时间:2019-05-06 10:54:06       来源:兴发娱乐|兴发娱乐平台(正规官网)

microchip公司的MCP3561/2/4是一/二/八路取样速率53.6 kSPS的24位Delta-Sigma模数转换器(ADC),可编数据速率高达153.6 kSPS.具有集成的特性如内部振荡器,温度传感器和断线传感器检测,从而降低系统元件数量和总体解决方案成本.MCP3561/2/4 ADC采用从32到98304的过取样比(OSR)和1/3X 到64X增益进行完全配置,分辨率24位,SINAD为106.7dB,THD为-116 dBc,SFDR(增益= 1X,4800 SPS)为120dBc,失调误差漂移为4/增益nV/℃(AZ_MUX = 1),增益误差漂移为0.5 ppm/℃(增益 = 1X),低噪音为90 nVRMS (增益= 16X,12.5 SPS),RMS ENOB高达23.3位,20MHz SPI兼容接口,AVDD为2.7V-3.6V,DVDD为1.8V-3.6V,工作温度-40℃到+125℃.主要用在精密传感器换能器和发送器如压力,应力,流量和力测量,工厂自动化和过程控制,手持仪表和温度测量.本文介绍了MCP3561/2/4系列主要特性,功能框图,应用案例以及用于PIC32 MCU的MCP3564 ADC评估板ADM00583主要特性,电路图,材料清单和PCB设计图.

Two/Four/Eight-Channel, 153.6 kSPS, Low-Noise 24-Bit Delta-Sigma ADCs

The MCP3561/2/4 are 1/2/4-channel, 24-bit,Delta-Sigma Analog-to-Digital Converters (ADCs), withprogrammable data rate of up to 153.6 kSPS. Theyoffer integrated features such as internal oscillator,temperature sensor and burnout sensor detection, inorder to reduce system component count and totalsolution cost.

The MCP3561/2/4 ADCs are fully configurable withOversampling Ratio (OSR) from 32 to 98304 and gainfrom 1/3X to 64X. These devices include an internalsequencer (SCAN mode) with multiple monitorchannels and a 24-bit timer to be able to automaticallycreate conversion loop sequences without needingMCU communications. Advanced security featuressuch as CRC and register map lock, can ensureconfiguration locking and integrity as well ascommunication data integrity for secure environments.

These devices come with a 20 MHz SPI-compatibleserial interface. Communication is largely simplifiedwith 8-bit commands, including various ContinuousRead/Write modes and 24/32-bit multiple data formatsthat can be accessed by the Direct Memory Access(DMA) of an 8-bit, 16-bit or 32-bit MCU.

The MCP3561/2/4 are available in an ultra-small,3 mm x 3 mm UQFN-20 package and are specifiedover an extended temperature range from -40℃to+125℃.

MCP3561/2/4系列主要特性:

• One/Two/Four Differential or Two/Four/EightSingle-Ended Input Channels
• 24-Bit Resolution
• Programmable Data Rate: up to 153.6 kSPS
• Programmable Gain: 0.33X to 64X
• 106.7 dB SINAD, -116 dBc THD, 120 dBc SFDR(Gain = 1X, 4800 SPS)
• Low-Temperature Drift:
- Offset error drift: 4/Gain nV/℃ (AZ_MUX = 1)
- Gain error drift: 0.5 ppm/℃ (Gain = 1X)
• Low-Noise: 90 nVRMS (Gain = 16X,12.5 SPS)
• RMS ENOB: Up to 23.3 Bits
• Wide Input Voltage Range: 0V to AVDD
• Differential Voltage Reference Inputs
• Internal Oscillator or External Clock Selection
• Ultra-Low Shutdown Current Consumption(< 2 μA)
• Internal Temperature Sensor
• Burnout Current Sources for Sensor Open/ShortDetection
• 24-Bit Digital Offset and Gain Error CalibrationRegisters
• Internal Conversions Sequencer (SCAN mode)for Automatic Multiplexing
• Dedicated IRQ Pin for Easy Synchronization
• Advanced Security Features:
- 16-bit CRC for secure SPI communications
- 16-bit CRC and IRQ for securingconfiguration
- Register map lock with 8-bit secure key
- Monitor controls for system diagnostics
• 20 MHz SPI-Compatible Interface with Mode 0,0and 1,1
• AVDD: 2.7V-3.6V
• DVDD: 1.8V-3.6V
• Extended Temperature Range: -40℃ to +125℃
• Package: 3 mm x 3 mm UQFN-20

MCP3561/2/4系列应用:

• Precision sensor transducers and transmitters:
pressure, strain, flow and force measurement
• Factory automation and process controls
• Portable instrumentation
• Temperature measurements

图1.MCP3561/2/4系列功能框图

图2.MCP3561/2/4系列简化模拟输入复接器电路图

图3.MPC3564应用案例

用于PIC32 MCU的MCP3564 ADC评估板ADM00583

The MCP3564 Evaluation Board for PIC32 MCUs represents a solution for integrating the ADC in a functional system with the possibility of interconnection with other boards,extensions and multiple modes of transmitting information to the PC. The evaluation board contains an LCD and three buttons available for the user, for interfacing with the system.

The MCP3564 ADC Evaluation Board for PIC32 MCUs provides the possibility to evaluate the performance of the MCP3564. It also provides a development platform for 32-bit PIC® device based applications, using existing 100-pin PIC microcontroller Plug-in Module (PIM) systems that are compatible with the Explorer 16 and other high-pin count PIC32 device-based demo boards. The system comes with a programmed PIC32MX795F512L PIM module that communicates with the Energy Management Utility software for data exchange and ADC setup.

The MCP3564 ADC Evaluation Board for PIC32 MCUs uses the Energy Management Utility software for evaluation of the MCP3564 via USB connection to the board. The link for downloading the software is available on the evaluation board ’s web page.

图4.MCP3564 ADC评估板ADM00583概述图(正面)

图5.评估板ADM00583外形图

MCP3564 ADC评估板包括:

• MCP3564 ADC Evaluation Board for PIC32 MCUs (ADM00583)
• PIC32MX795F512L PIM
• USB Cable
• Jumpers
• Important Information Sheet

图6.评估板ADM00583电路图(1)

图7.评估板ADM00583电路图(2)

图8.评估板ADM00583电路图(3)

图9.评估板ADM00583电路图(4)

图10.评估板ADM00583电路图(5)
评估板ADM00583材料清单:




材料清单(不常用BOM)


图11.评估板ADM00583 PCB设计图(1):顶层丝印

图12.评估板ADM00583 PCB设计图(2):顶层铜和丝印

图13.评估板ADM00583 PCB设计图(3):顶层铜

图14.评估板ADM00583 PCB设计图(4):底层铜

图15.评估板ADM00583 PCB设计图(5):底层铜和丝印

图16.评估板ADM00583 PCB设计图(6):底层丝印
详情请见:
http://59.80.44.44/ww1.microchip.com/downloads/en/DeviceDoc/MCP3561-1-2-4-Data-Sheet-20006181A.pdf
http://59.80.44.49/ww1.microchip.com/downloads/en/DeviceDoc/MCP3564-ADC-Eval-Board-for-PIC32-User-Guide-50002858A.pdf
MCP3561-1-2-4-Data-Sheet-20006181A.pdf
MCP3564-ADC-Eval-Board-for-PIC32-User-Guide-50002858A.pdf

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