43.17 ADC Electrical Specifications

Table 43-21. ADC AC Electrical Specifications
AC CharacteristicsStandard Operating Conditions: VDD = 1.9V to 3.6V (unless otherwise stated) Operating Temperature: -40°C ≤ TA ≤ +85°C for Industrial Temp -40°C ≤ TA ≤ +125°C for Extended Temp
Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
Device Supply
ADC_1AVDDADC module supplyAVDD(min)AVDD(max)V
Reference Inputs
ADC_2VREF(4)Absolute reference voltage (VREFH-VREFL) (4)AVSS-0.3AVDD+0.3V
ADC_3VREFReference voltage high (external reference buffers) AVSS+1.8AVDDV
ADC_4 VREFLReference voltage low (external reference buffers)AVSSAVDD-1.8V
ADC_4aRREFSuggested VREF impedance25Resistance from source to the VREFP/VREFM input, including RSource, PCB trace, pads and on-chip routing
ADC_4bVCMAnalog input Common mode voltageAVSS + VREF/2AVDD - VREF/2V
ADC_4cVDIFF

Differential analog input voltage (seldiff = 1)

(VINP - VINN)

2*(VREFH - VREFL)V
ADC_4dVSINGSingle-ended analog input voltage (seldiff = 0) (VINP - VINN)VREFLVREFH
ADC_4eRIN_INTADC internal resistance 200Internal sampling switch resistance
ADC_4fRIN_SYSExternal input resistance to meet the maximum speed 125Resistance from VINP/VINM to signal source. Include RSource + RPad + RPCB + Rroute
ADC_4gRSRCMaximum source impedance to meet 2 MSPS at 12-bit 500
Maximum source impedance to meet 1 MSPS at 12-bit 1400
Analog Input Range
ADC_7AFSFull-scale analog input signal range (Single-ended)AVSSVREFVVREF = AVDD(max)
ADC_11TSETTLINGADC stabilization time10µs
Table 43-22. ADC Single-Ended Mode AC Electrical Specifications
AC CharacteristicsStandard Operating Conditions: VDD = 1.9V to 3.6V (unless otherwise stated) Operating Temperature: -40°C ≤ TA ≤ +85°C for Industrial Temp -40°C ≤ TA ≤ +125°C for Extended Temp
Param. No.SymbolCharacteristicsMin.TypicalMax.UnitsConditions
Single-Ended Mode ADC Accuracy
SADC_11ResResolution612bitsSelectable 8-, 10-, 12-bit resolution ranges
SADC_13EN0B(3)Effective number of bits6.3bits2 Msps, Internal VREF, AVDD = VDDIO = 3.3V
SADC_19INL(3)Integral non linearity -13.737 2.869LSb 2 Msps, Internal VREF, AVDD = VDDIO = 3.3V
SADC_25DNL(3)Differential non linearity-1.628 1.736LSb2 Msps, Internal VREF, AVDD = VDDIO = 3.3V
SADC_31GERR(3)Gain error-8.198-4.697LSb2 Msps, Internal VREF, AVDD = VDDIO = 3.3V
SADC_37 E0FF(3)Offset error4.90525.094 LSb 2 Msps, Internal VREF, AVDD = VDDIO = 3.3V
Single-Ended Mode ADC Dynamic Performance
SADC_49SINAD(1,2,3)Signal to noise and distortion39.728dBVREF = AVDD = VDDIO = 3.3V at 12-bit resolution, max sampling rate(1,2)
SADC_51SNR(1,2,3)Signal to noise ratio39.747
SADC_53SFDR(1,2,3)Spurious free dynamic range61.32
SADC_55THD(1,2,3)Total harmonic distortion-59.346
Note:
  1. Characterized with an analog input sine wave = (FTP(max)/100). Example: FTP(max) = 1 Msps/100 = 10 kHz sine wave.
  2. Sine wave peak amplitude = 96% ADC_ Full Scale amplitude input with 12-bit resolution.
  3. Spec values collected under the following additional conditions:
    1. At least (3) SERCOM, (2) TCC and (2) TC peripheral clocks active but the same peripherals disabled, not running.
    2. At least (6) I/O pins toggling simultaneously at > 6 MHz, not adjacent to analog input pin; (3) with external 2 ma pull-up loads & (3) with external 2 ma pull-down loads on the side of the package shared by VDDANA.
    3. 12-bit resolution mode.

  4. ADC functional device operation with either internal or external VREF < 2.4V is functional but not characterized. ADC will function, but with degraded accuracy of approximately ~((0.06 * 2n)/VREF) LSBs over full scale range, where “n”=#bits. ADC accuracy is limited by internal VREF accuracy + drift, MCU generated noise plus user's application noise/accuracy on VDDANA, GNDANA.
  5. Value taken over 7 harmonics.
Table 43-23. ADC Conversion AC Electrical Requirements
AC CharacteristicsStandard Operating Conditions: VDD = 1.9V to 3.6V (unless otherwise stated) Operating Temperature: -40°C ≤ TA ≤ +85°C for Industrial Temp -40°C ≤ TA ≤ +125°C for Extended Temp
Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
ADC_ Clock Requirements
ADC_57TADADC clock period20.8nsVREF = AVDD = 3.3V
ADC Single-Ended Throughput Rates
ADC_59FTPR (Single-ended mode)Throughput rate(4) (Single-ended)0.012Msps

12-bit resolution, DIV_SHR = 2

Note:
  1. ADC_ Sample time = ((SAMPCTRL.SAMPLEN + 1) * TAD) and SAMPCTRL.OFFCOMP = 0.
  2. ADC_ HDW forces sample time to 4*TAD when SAMPCTRL.OFFCOMP = 1; user SAMPCTRL.SAMPLEN is ignored.
  3. ADC Throughput Rate FTP = ((1/((TSAMP + TCNV) * TAD))/(# of user active analog inputs in use on specific target ADC module)).
    Note: Specification values assume only one AINx channel in use.
  4. SAMPCTRL.R2R = 1. (Must be set to ‘1’ in ADC differential mode).
Table 43-24. ADC Sample AC Electrical Requirements
AC CharacteristicsStandard Operating Conditions: VDD = 1.9V to 3.6V (unless otherwise stated) Operating Temperature: -40°C ≤ TA ≤ +85°C for Industrial Temp -40°C ≤ TA ≤ +125°C for Extended Temp
Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
ADC_63TSAMPADC sample time (1,2,3,5)1(1,5)TAD12-bit TAD(min), Ext Analog Input Rsource ≤ 147Ω
10-bit TAD(min), Ext Analog Input Rsource ≤ 504Ω
8-bit TAD(min), Ext Analog Input Rsource ≤ 1,000Ω
2(1,5)12-bit TAD(min), Ext Analog Input Rsource ≤ 2,272Ω
10-bit TAD(min), Ext Analog Input Rsource ≤ 3,008Ω
8-bit TAD(min), Ext Analog Input Rsource ≤ 4,000Ω
3(1,5)12-bit TAD(min), Ext Analog Input Rsource ≤ 4,416Ω
10-bit TAD(min), Ext Analog Input Rsource ≤ 5,504Ω
8-bit TAD(min), Ext Analog Input Rsource ≤ 6,976Ω
4(1,2,5)12-bit TAD(min), Ext Analog Input Rsource ≤ 6,560Ω
10-bit TAD(min), Ext Analog Input Rsource ≤ 8,000Ω
8-bit TAD(min), Ext Analog Input Rsource ≤ 9,984Ω
5(1,5)12-bit TAD(min), Ext Analog Input Rsource ≤ 8,704 Ω
10-bit TAD(min), Ext Analog Input Rsource ≤ 10,496Ω
8-bit TAD(min), Ext Analog Input Rsource ≤ 12,992Ω
6(1,5,6)12-bit TAD(min), Ext Analog Input Rsource ≤ 10,880Ω
10-bit TAD(min), Ext Analog Input Rsource ≤ 12,992Ω
8-bit TAD(min), Ext Analog Input Rsource ≤ 16,000Ω
nsWith DAC as input
With temperature sensor as input
ADC_65TCNVConversion time (3) (Single-Ended mode)12TAD12-bit resolution
1110-bit resolution
98-bit resolution
Note:
  1. When SAMPCTRL.OFFCOMP = 0:
    • TSAMP = (((RSAMPLE + RSOURCE) * CSAMPLE * (#Bits Resolution + 2) * ln(2))/TAD)+1 rounded down to nearest whole integer
    • User SAMPCTRL.SAMPLEN = (TSAMP – 1)
  2. When SAMPCTRL.OFFCOMP = 1:
    • TSAMP = 4 (Forced by HDW)
    • User SAMPCTRL.SAMPLEN = (n/a, Ignored by HDW)
  3. ADC Throughput Rate FTP = ((1/((TSAMP + TCNV) * TAD))/(# of user active analog inputs in use on specific target ADC module)).
    Note: Specification values assume only one AINx channel in use.
  4. SAMPCTRL.R2R = 1. (Must be set to ‘1’ in ADC differential mode).
  5. TSAMP ≥ (INT[((RSAMPLE + RSOURCE) * CSAMPLE * (#Bits Resolution+2) * ln(2))/TAD]+1).
  6. For RSOURCE values exceeding TSAMP = 6 sample time condition, use the formula in note 5 to calculate.