APM32F103CBT6-R datasheet(54/78 Pages) GEEHY

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w w w. g e e h y. c o m

P a g e 53

TS (cycle)

tS（

μs）

Maximum RAIN

(kΩ)

1.5

0.11

1.2

7.5

0.54

13.5

0.96

28.5

2.04

41.5

2.96

55.5

3.96

71.5

5.11

104

239.5

17.1

350

Guaranteed by design and not tested in production.

Table43 ADC Accuracy (1) (2)

Symbol

Parameter

Test conditions

Typical

value

Maximum

value (3)

Unit

Composite error

fPCLK2=56MHz,

fADC=14MHz,RAIN

<10KΩ,

VDDA=2.4~3.6V,TA=-40~105℃

Measurement is conducted after

ADC calculation

±2.5

±4.5

LSB

Offset error

±1.0

±2

Gain error

±2.0

±3.5

Differential linear

error

±1.5

±3

Integral linear

error

±2.5

±4

DC accuracy value of ADC is measured after internal calibration.

The backward injection of current will significantly affect the ADC accuracy. It is recommended to add a

Schottky diode (between the pin and the ground) on the standard analog pin that may generate

backward injection of current.

As long as the forward injection current is within the range of IINJ (PIN)

and ΣIINJ (PIN) given in 5.9, the ADC

accuracy will not be affected.

It is assessed value.

5.12.1.2 Test of Built-in Reference Voltage Characteristics

Table44 Built-in Reference Voltage Characteristics

Symbol

Parameter

Condition

Minimum

value

Typical

value

Maximum

value

Unit

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