SLAA890A December   2019  – August 2021 MSP430FR2000 , MSP430FR2032 , MSP430FR2033 , MSP430FR2100 , MSP430FR2110 , MSP430FR2111 , MSP430FR2153 , MSP430FR2155 , MSP430FR2310 , MSP430FR2311 , MSP430FR2353 , MSP430FR2355 , MSP430FR2422 , MSP430FR2433 , MSP430FR2475 , MSP430FR2476 , MSP430FR2512 , MSP430FR2522 , MSP430FR2532 , MSP430FR2533 , MSP430FR2632 , MSP430FR2633 , MSP430FR2672 , MSP430FR2673 , MSP430FR2675 , MSP430FR2676 , MSP430FR4131 , MSP430FR4132 , MSP430FR4133

 

  1.   Trademarks
  2. 1Overview of the MSP430FR4xx and MSP430FR2xx ADC Module
  3. 2Comparison Between the FR2xx/FR4xx ADC and ADC12_B
    1. 2.1 Outline of ADC12_B
    2. 2.2 Outline of FR2xx/FR4xx ADC
    3. 2.3 FR2xx/FR4xx ADC Pin Selection and Board Design
    4. 2.4 Key Parameters Comparison
  4. 3Tailoring the ADC and Reference Voltages to Your Application
    1. 3.1 Reference Voltages
    2. 3.2 Internal and External Reference Voltage
    3. 3.3 Signal Resolution
    4. 3.4 Selecting the Right Sampling and Conversion Time to Achieve the Target Conversion Rate
    5. 3.5 Clock Selection
  5. 4Using the Window Comparator to Monitor a Signal Without CPU Intervention
  6. 5Calibration of VREF and the Internal Temperature Sensor to Improve Performance
  7. 6FR2xx/FR4xx ADC Example Code and Resources
  8. 7References
  9. 8Revision History

2.4 Key Parameters Comparison

Table 2-1 lists the key timing and linearity parameters to compare a few products with the FR2xx/FR4xx ADC and the ADC12_B. For more details, see the device-specific data sheet.

Table 2-1 Parameter Comparison
ParameterDescriptionConditionDevice
MSP430FR2355MSP430FR2311MSP430FR58xx
FR2xx/FR4xx ADC 12-Bit ModeFR2xx/FR4xx ADC 10-Bit ConfigurationADC12_B Single-Ended Mode
fADCCLKADC clock frequency4.4 MHz max5.5 MHz max5.4 MHz max
tSampleSampling timeNotes0.61 µs min(1)2 µs min1 µs min
tCONVERTConversion time14 × 1/fADCCLK12 × 1/fADCCLK(3)14 × 1/fADC12CLK(2)
EIIntegral linearity errorVeref+ reference±2.5 LSB±2 LSB±2.2 LSB
EDDifferential linearity errorVeref+ reference±1 LSB±1 LSB-0.99 + 1 LSB
EOOffset errorVeref+ reference±1.5 LSB±6.5 mV±1.5 mV
EGGain errorVeref+ reference±3 LSB±2 LSB±2.5 LSB
ETTotal unadjusted errorVeref+ reference±4 LSB±2 LSB±3.5 LSB
(1) The FR2355 minimum sampling time test conditions are: RS = 1000 Ω, RI = 4000 Ω, CI = 5.5 pF, Cexternal = 8.0 pF. Approximately 9.01 Tau (τ) are required for an error of less than ±0.5 LSB in 12-bit mode.
(2) The FR58xx minimum sampling time test conditions are: RS = 400 Ω, RI = 4 kΩ, CI = 15 pF, Cpext= 8 pF
(3) The FR2311 minimum sampling time test conditions are: RS = 1000 Ω, RI = 36000 Ω, CI = 3.5 pF. Approximately 8 Tau (τ) are required for an error of less than ±0.5 LSB.