STM32H7B3II datasheet(149/238 Pages) STMICROELECTRONICS

149 / 238 page

Symbol

Parameter

Conditions(1)

Min

Typ

Max

Unit

LSB

Offset error

±10

Gain error

±15

Differential linearity error

Single ended

+3/–1

Differential

+4.5/–1

Integral linearity error

Direct channel

Single ended

±11

Differential

±7

Fast channel

Single ended

±13

Differential

±7

Slow channel

Single ended

±10

Differential

±6

ENOB

Effective number of bits

Single ended

12.2

Bits

Differential

13.2

SINAD

Signal-to-noise and distortion ratio

Single ended

75.2

Differential

81.2

SNR

Signal-to-noise ratio

Single ended

77.0

Differential

81.0

THD

Total harmonic distortion

Single ended

Differential

1. ADC clock frequency = 25 MHz, ADC resolution = 16 bits, VDDA=VREF+=3.3 V and BOOST=11.

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 6.3.15 I/O current

injection characteristics does not affect the ADC accuracy.

Figure 55. ADC accuracy characteristics

(1) Example of an actual transfer curve

(2) Ideal transfer curve

(3) End-point correlation line

n = ADC resolution

ET = total unadjusted error: maximum deviation

between the actual and ideal transfer curves

EO = offset error: maximum 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

2n-1

Output code

VSSA

2n-2

2n-3

VREF+ (VDDA)

1 LSB ideal

(1)

(2)

(3)

(or

)]

[1LSB =

VDDA

VREF+

Example of an actual transfer curve.

STM32H7B3xI

Operating conditions

DS13139 - Rev 8

page 149/238

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