Datasheet

Electrical characteristics STM32F745xx STM32F746xx
148/227 DocID027590 Rev 4
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 I
INJ(PIN)
and ΣI
INJ(PIN)
in
Section 5.3.17 does not affect the ADC accuracy.
Table 65. ADC static accuracy at f
ADC
= 36 MHz
Symbol Parameter Test conditions Typ Max
(1)
1. Guaranteed by characterization results.
Unit
ET Total unadjusted error
f
ADC
=36 MHz,
V
DDA
= 2.4 to 3.6 V,
V
REF
= 1.7 to 3.6 V
V
DDA
− V
REF
< 1.2 V
±4 ±7
LSB
EO Offset error ±2 ±3
EG Gain error ±3 ±6
ED Differential linearity error ±2 ±3
EL Integral linearity error ±3 ±6
Table 66. ADC dynamic accuracy at f
ADC
= 18 MHz - limited test conditions
(1)
Symbol Parameter Test conditions Min Typ Max Unit
ENOB Effective number of bits
f
ADC
=18 MHz
V
DDA
= V
REF+
= 1.7 V
Input Frequency = 20 KHz
Temperature = 25 °C
10.3 10.4 - bits
SINAD Signal-to-noise and distortion ratio 64 64.2 -
dBSNR Signal-to-noise ratio 64 65 -
THD Total harmonic distortion − 67 − 72 -
1. Guaranteed by characterization results.
Table 67. ADC dynamic accuracy at f
ADC
= 36 MHz - limited test conditions
(1)
Symbol Parameter Test conditions Min Typ Max Unit
ENOB Effective number of bits
f
ADC
=36 MHz
V
DDA
= V
REF+
= 3.3 V
Input Frequency = 20 KHz
Temperature = 25 °C
10.6 10.8 - bits
SINAD Signal-to noise and distortion ratio 66 67 -
dBSNR Signal-to noise ratio 64 68 -
THD Total harmonic distortion − 70 − 72 -
1. Guaranteed by characterization results.
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