STM32F429NET6TR datasheet(156/231 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F427xx STM32F429xx

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DocID024030 Rev 6

Note:

ADC accuracy vs. negative injection current: injecting a negative current on any 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 analog pins which may potentially inject negative currents.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in

Section 6.3.17 does not affect the ADC accuracy.

Figure 50. ADC accuracy characteristics

1. See also Table 76.

2. Example of an actual transfer curve.

3. Ideal transfer curve.

4. End point correlation line.

5. ET = Total Unadjusted Error: maximum deviation between the actual and the ideal transfer curves.

EO = Offset Error: deviation between the first actual transition and the first ideal one.

EG = Gain Error: deviation between the last ideal transition and the last actual one.

ED = Differential Linearity Error: maximum deviation between actual steps and the ideal one.

EL = Integral Linearity Error: maximum deviation between any actual transition and the end point

correlation line.

Table 79. ADC dynamic accuracy at fADC = 36 MHz - limited test conditions(1)

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

ENOB

Effective number of bits

fADC =36 MHz

VDDA = VREF+ = 3.3 V

Input Frequency = 20 KHz

Temperature = 25 °C

10.6

10.8

bits

SINAD

Signal-to noise and distortion ratio

SNR

Signal-to noise ratio

THD

Total harmonic distortion

− 70

− 72

1. Guaranteed by characterization results.

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