Data Sheet

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1081

1081

Atmel | SMART SAM D21 [DATASHEET]

Atmel-42181G–SAM-D21_Datasheet–09/2015

Notes: 1. Maximum numbers are based on characterization and not tested in production, and for 5% to 95% of the input voltage

range.

2. Respect the input common mode voltage through the following equations (where VCM_IN is the Input channel com-

mon mode voltage) for all VIN:

z VCM_IN < 0.7*VDDANA + VREF/4 – 0.75V

z VCM_IN > VREF/4 – 0.3*VDDANA - 0.1V

3. The ADC channels on pins PA08, PA09, PA10, PA11 are powered from the VDDIO power supply. The ADC perfor-

mance of these pins will not be the same as all the other ADC channels on pins powered from the VDDANA power

supply.

4. The gain accuracy represents the gain error expressed in percent. Gain accuracy (%) = (Gain Error in V x 100) /

(Vref/GAIN)

Performance with the Averaging Digital Feature

Averaging is a feature which increases the sample accuracy. ADC automatically computes an average value of multiple

consecutive conversions. The numbers of samples to be averaged is specified by the Number-of-Samples-to-be-

collected bit group in the Average Control register (AVGCTRL.SAMPLENUM[3:0]) and the averaged output is available

in the Result register (RESULT).

Table A-19. Single-Ended Mode (Device Variant B)

Symbol Parameter Conditions Min. Typ. Max. Units

ENOB Effective Number of Bits With gain compensation - 9.7 10.1 Bits

TUE Total Unadjusted Error 1x gain - 7.9 40.0 LSB

INL Integral Non-Linearity 1x gain 1.4 2.6 6.0 LSB

DNL Differential Non-Linearity 1x gain +/-0.6 +/-0.7 +/-0.95 LSB

Gain Error Ext. Ref. 1x -5.0 0.6 5.0 mV

Gain Accuracy

(4)

Ext. Ref. 0.5x +/-0.1 +/-0.37 +/-0.55 %

Ext. Ref. 2x to 16X +/-0.01 +/-0.1 +/-0.2 %

Offset Error Ext. Ref. 1x -5.0 0.6 10.0 mV

SFDR Spurious Free Dynamic Range

1x Gain

CLK_ADC = 2.1MHz

IN = 40kHz

= 95%FSR

63.0 68.0 68.7 dB

SINAD Signal-to-Noise and Distortion 55.0 60.1 62.5 dB

SNR Signal-to-Noise Ratio 54.0 61.0 64.0 dB

THD Total Harmonic Distortion -69.0 -68.0 -65.0 dB

Noise RMS T = 25 C - 1.0 - mV

Table A-20. Averaging Feature

Average

Number

Condition SNR(dB) SINAD(dB) SFDR(dB) ENOB(bits)

In differential mode, 1x gain,

VDDANA=3.0V, VREF=1.0V,

350kSps at 25 C

66 65 72.8 10.5

8 67.6 65.8 75.1 10.62

32 69.7 67.1 75.3 10.85

128 70.4 67.5 75.5 10.91