STM32F407IG datasheet(109/154 Pages) STMICROELECTRONICS

109 / 154 page

STM32F405xx, STM32F407xx

Electrical characteristics

Doc ID 022152 Rev 1

109/154

Equation 1: RAIN max formula

The formula above (Equation 1) is used to determine the maximum external impedance

allowed for an error below 1/4 of LSB. N = 12 (from 12-bit resolution) and k is the number of

sampling periods defined in the ADC_SMPR1 register.

Note:

ADC accuracy vs. negative injection current: Injecting a 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 currents.

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

Section 5.3.16 does not affect the ADC accuracy.

Table 65.

ADC accuracy (1)(2)

Better performance could be achieved in restricted VDD, frequency and temperature ranges.

TBD stands for “to be defined”.

Symbol

Parameter

Test conditions

Typ

Max(3)

Based on characterization, not tested in production.

Unit

Total unadjusted error

fPCLK2 = 84 MHz,

fADC = 36 MHz, RAIN < 10 kΩ,

VDDA = 1.8

(4) to 3.6 V

If PDR_ON is set to VSS, this value can be lowered to 1.7 V when the device operates in a reduced

temperature range (0 to 70 °C).

TBD

LSB

Offset error

TBD

Gain error

TBD

Differential linearity error

TBD

Integral linearity error

TBD

AIN

k0.5

–

()

ADC

()

--------------------------------------------------------------

ADC

–

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