STM32F405 datasheet(135/204 Pages) STMICROELECTRONICS

135 / 204 page

DS8626 Rev 9

135/203

STM32F405xx, STM32F407xx

Electrical characteristics

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 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 SIINJ(PIN) in

Section 5.3.16 does not affect the ADC accuracy.

Table 68. ADC accuracy at fADC = 30 MHz

Symbol

Parameter

Test conditions

Typ

Max(1)

1. Guaranteed by characterization.

Unit

Total unadjusted error

fPCLK2 = 60 MHz,

fADC = 30 MHz, RAIN < 10 kΩ,

VDDA = 1.8(2) to 3.6 V

2. VDD/VDDA minimum value of 1.7 V is obtained when the device operates in reduced temperature range,

and with the use of an external power supply supervisor (refer to Section : Internal reset OFF).

±2

±5

LSB

Offset error

±1.5

±2.5

Gain error

±1.5

±3

Differential linearity error

±1

±2

Integral linearity error

±1.5

±3

RAIN

k0.5

–

()

fADC CADC

()

-------------------------------------------------------------- RADC

–

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