STM32L053 datasheet(93/132 Pages) STMICROELECTRONICS

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STM32L053x6 STM32L053x8

Electrical characteristics

112

Figure 26. ADC accuracy characteristics

Total unadjusted error

1.65 V < VREF+ < VDDA < 3.6 V,

range 1/2/3

-2

LSB

Offset error

2.5

Gain error

Integral linearity error

1.5

Differential linearity error

ENOB

Effective number of bits

10.0

11.0

bits

SINAD Signal-to-noise distortion

SNR

Signal-to-noise ratio

THD

Total harmonic distortion

-85

-65

1. ADC DC accuracy values are measured after internal calibration.

2. ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-robust) analog input

pins should be avoided as this significantly reduces the accuracy of the conversion being performed on another analog

input. It is recommended to add a Schottky diode (pin to ground) to standard analog pins which may potentially inject

negative current.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 6.3.12 does not affect the ADC

accuracy.

3. Better performance may be achieved in restricted VDDA, frequency and temperature ranges.

4. This number is obtained by the test board without additional noise, resulting in non-optimized value for oversampling mode.

Table 64. ADC accuracy(1)(2)(3) (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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