MSP430 16-bit Sigma-delta

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Sigma-delta red.jpg
                                                                                                  







            

SD16 Overview

Features                                                                                                                          

  • High resolution                                                                                                                   
    Sigma Delta circuit diagram.jpg
  • Differential inputs and ability to accept negative voltages
  • Includes Programmable gain amplifier 
  • Accurate internal reference

Benefits

  • Accurate and precise measurements
  • No level-shifting necessary for bi-polar signals
  • No need for external Op-Amps
  • No need for external voltage reference

Applications include

  • Utility Metering
  • Blood Glucose Monitoring
  • Weigh Scale
  • Thermostats


Metrics


Performance

  • 9uV voltage resolution at 1.2V reference
  • Sampling clock of up to 1.1 MHz
  • Over sampling ratios of up to 1024
  • Gain settings of up to 32


Power

  • 500uA ON current
  • Power saving mode for lower sampling rates


Registers

  • Conversion register to read up to 32-bit result
  • Selectable clock dividers
  • User-defined sampling delay


Modes

  • Single conversion
  • Sequential conversion
  • Group conversion


SD16/ SD16_A

  • Single / multiple channels
    Texas Instruments Sigma Delta 2.jpg
  • Single / Multiple input pairs
  • Input buffer
  • AVCC measure
  • Ext/ Int reference
  • Integrated temperature sense
  • 30kHz to 1.1MHz
  • Programmable gain amplifier
  • fM divider
  • Up to 1024 OSR

 

 

 

 

 

 

 


Competition

MSP430 SD16 is 3x more accurate than any competitor!
MSP430 SD16 consumes 2x less power than any competitor!

Sigma Delta Competition2.jpg




 

 

 

 

 

 

 

 

 

 

 



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Metrology Accuracy Results during 3-phase operations

Metrology test data.png            Metrology chart.jpg              

     

Even with a phase shift of 60, the SD16’s reach < 0.1% accuracy!!



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Competitor A Metrology Accuracy Results (from Datasheet)

Competitor a metrology.png


How to get started with the SD16?

Use the MCUSelection Guide at http://ti.com/mcuselectiontool or the exported XLS sheet (http://ap-fpdsp-swapps.dal.design.ti.com/images/6/6b/MSP430_SD16_parts.xls)  (example below)


MCU Selection Guide.png