GD32F310 datasheet(57/81 Pages) GIGADEVICE

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GD32F310xx Datasheet

Figure 4-5. I/O port AC characteristics definition

10%

50%

90%

10%

90%

50%

tr(IO)out

tf(IO)out

EXTERNAL

OUTPU T

ON 50pF

If (tr + tf) ≤ 2/3 T, then maximum frequency is achieved .

The duty cycle is （45%-55%）when loaded by 50 pF

4.13

ADC characteristics

Table 4-27. ADC characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA(1)

Operating voltage

—

2.6

3.3

3.6

VIN(1)

ADC input voltage range

—

VDDA

fADC(1)

ADC clock

—

0.1

—

MHz

fS(1)

Sampling rate

12-bit

0.007

—

2.57

MSPS

10-bit

0.008

—

3.00

8-bit

0.01

—

3.60

6-bit

0.011

—

4.50

VAIN(1)

Analog input voltage

10 external; 3 internal

—

VDDA

RAIN(2)

External input impedance

See

Equation 1

—

171

kΩ

RADC(2)

Input sampling switch

resistance

—

0.2

kΩ

CADC(2)

Input sampling capacitance

No pin/pad capacitance

included

—

tCAL(2)

Calibration time

fADC = 40 MHz

—

3.63

—

μs

ts(2)

Sampling time

fADC = 40 MHz

0.04

—

6.65

μs

tCONV(2)

Total conversion

time(including sampling

time)

12-bit

—

1/ fADC

10-bit

—

8-bit

—

6-bit

—

tSU(2)

Startup time

—

μs

(1)

Based on characterization, not tested in production.

(2)

Guaranteed by design, not tested in production.

Equation 1 ：RAIN max formula RAIN <

fADC∗CADC∗ln(2N+2)

− RADC

The formula above (

Equation 1) is used to determine the maximum external impedance allowed for

an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).

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