43.21 ADC Electrical Specifications

Table 43-23. ADC AC Electrical Specifications
AC Characteristics Standard Operating Conditions: VDDIO = VDDANA 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. Symbol Characteristics Min. Typ. Max. Units Conditions
Device Supply
ADC_1 VDDANA ADC module supply VDDANA(min) — VDDANA(max) V VDDIO = VDDANA
Reference Inputs
ADC_3 VREF(4) Reference voltage high (external reference buffers) — — VDDANA V ADC reference voltage
Analog Input Range
ADC_7 AFS Full-scale analog input signal range (Single-ended) 0 — VDDANA V VREF = VDDANA(max)
Table 43-24. ADC Single-Ended Mode AC Electrical Specifications
AC Characteristics Standard Operating Conditions: VDDIO = VDDANA 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. Symbol Characteristics Min. Typ. Max. Units Conditions
Single-Ended Mode ADC Accuracy
SADC_11 Res Resolution 6 — 12 bits Selectable 8, 10, 12 bit resolution ranges
SADC_13 EN0B(3) Effective number of bits 6.081 9.849 10.795 bits 2 Msps, Internal VREF, VDDANA = VDDIO = 3.3V
TBD
SADC_19 INL(3) Integral non linearity -2.94 -1.18 1.96 LSb 2 Msps, Internal VREF, VDDANA = VDDIO = 3.3V
SADC_25 DNL(3) Differential non linearity -1.42 1.2977 2.59 LSb 2 Msps, Internal VREF, VDDANA = VDDIO = 3.3V
SADC_31 GERR(3) Gain error 11.90 18.93 25.00 LSb 2 Msps, Internal VREF, VDDANA = VDDIO = 3.3V
SADC_37 E0FF(3) Offset error -8.0837 -4.001 -0.3793 LSb 2 Msps, Internal VREF, VDDANA = VDDIO = 3.3V
Single-Ended Mode ADC Dynamic Performance
SADC_49 SINAD(1,2,3) Signal to noise and distortion 38.4 61.1 66.8 dB VREF = VDDANA = VDDIO = 3.3V at 12-bit resolution, max sampling rate(1,2)
SADC_51 SNR(1,2,3) Signal to noise ratio 38.4 61.8 67.3
SADC_53 SFDR(1,2,3) Spurious free dynamic range 61.5 70.3 81.3
SADC_55 THD(1,2,3) Total harmonic distortion -84.0 -70.1 -59.8
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. 12-bit resolution mode
    2. All registers at reset default value otherwise not mentioned
  4. ADC measurements done with 3.3V VREF voltage.
  5. Value taken over 7 harmonics.
  6. Referred to as AVDD in the pinout.
Table 43-25. ADC Conversion AC Electrical Requirements
AC Characteristics Standard Operating Conditions: VDDIO = VDDANA 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. Symbol Characteristics Min. Typ. Max. Units Conditions
ADC_ Clock Requirements
ADC_57 TAD ADC clock period — 20.83 — ns VREF = VDDANA = 3.3V
ADC Single-Ended Throughput Rates
ADC_59 FTPR (Single-ended mode) Throughput rate(3) (Single-ended) 0.01 — 2 Msps

12-bit resolution, DIV_SHR = 2
Note:

  1. Throughput Rate = 1/((SAMC_SHR +15)*TADX)

    TADX=1/ (ADC Control Clock / DIV_SHR) ,SAMC_SHR = sampling rate
Table 43-26. ADC Sample AC Electrical Requirements
AC Characteristics Standard Operating Conditions: VDDIO = VDDANA 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. Symbol Characteristics Min. Typ. Max. Units Conditions
ADC_63 TSAMP ADC sample time (1,2,3,4) 1(1,4) — — TAD 12-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(1,4) — — 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(1,4) — — 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(1,2,4) — — 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(1,4) — — 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(1,4,5) — — 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
ADC_65 TCNV Conversion time (3) (Single-Ended mode) 14 TAD 12-bit resolution
12 10-bit resolution
10 8-bit resolution
ADC_69 CSAMPLE ADC internal sample cap 4 5 6 pf —
ADC_71 RSAMPLE ADC internal impedance — — 200 Ω —
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. TSAMP ≥ (INT[((RSAMPLE + RSOURCE) * CSAMPLE * (#Bits Resolution+2) * ln(2))/TAD]+1).
  5. For RSOURCE values exceeding TSAMP = 6 sample time condition, use the formula in note 5 to calculate.