MM32F103CET datasheet(74/89 Pages) MINDMOTION

74 / 89 page

DS_MM32F103xx_o_Ver1.13

Electrical characteristics

Formula 1: Maximum RAIN Formula

RAIN

fADC

× CADC × (N + 3) × ln(2)

− RADC

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

so that the error can be less than 1/4 LSB. Where N = 12 (representing 12-bit resolution)

. Ln(2) = 0.69314718.

Table 41. Maximum RAIN at fADC = 15MHz

(1)

TS (cycles)

tS (µs)

RAIN max (kΩ)

1.5

0.1

0.2

7.5

0.5

4.1

13.5

0.9

7.9

28.5

1.9

17.5

41.5

2.8

25.9

55.5

3.7

34.8

71.5

4.8

239.5

16.0

1. Guaranteed by design. Not tested in production.

Table 42. ADC Accuracy - Limit Test Conditions(1)(2)

Symbol

Parameter

Test Conditions

Type

Max

Unit

Comprehensive error

fPCLK2 = 60MHz,fADC =

15MHz,RAIN

< 10KΩ,VDDA

= 5V，TA = 25◦C

LSB

Offset error

Gain error

Differential linearity error

6.5

Integral linearity error

1. ADC Accuracy vs. Negative Injection Current: Injecting 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 current.

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

subsubsec 5.3.13 does not affect the ADC accuracy.

2. Guaranteed based on test during characterization. Not tested in production.

ET = Total unadjusted error: The maximum deviation between the actual and ideal trans-

mission curves.

EO = Offset error: The deviation between the first actual conversion and the first ideal

conversion.

www.mm32mcu.com

68/83

MM32F103CET Fiches technique(PDF) 74 Page - MindMotion Microelectronics

MM32F103CET Fiches technique(HTML) 74 Page - MindMotion Microelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89

Fiches technique Télécharger

Lien URL