STM32F407IGH6 datasheet(131/185 Pages) STMICROELECTRONICS

131 / 185 page

DocID022152 Rev 4

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STM32F405xx, STM32F407xx

Electrical characteristics

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 5.3.16 does not affect the ADC accuracy.

Figure 50. ADC accuracy characteristics

1. See also Table 68.

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.

Table 68. ADC accuracy at fADC = 30 MHz(1)

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

Symbol

Parameter

Test conditions

Typ

Max(2)

2. Based on characterization, not tested in production.

Unit

Total unadjusted error

fPCLK2 = 60 MHz,

fADC = 30 MHz, RAIN < 10 kΩ,

VDDA = 1.8(3) to 3.6 V

3. 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

ai14395c

1L SBIDEAL

4095

4094

4093

456

4093 4094 4095 4096

(1)

(2)

(3)

VDDA

VSSA

V REF+

4096

(or

depending on package)]

V DDA

4096

[1LSB IDEAL=

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