Atmel Xplained Pro Evaluation Kit ATSAMD20-XPRO ATSAMD20-XPRO Hoja De Datos

578

Atmel | SMART SAM D20 [DATASHEET]

Atmel-42129K–SAM-D20_datasheet–06/2014

To achieve n bits of accuracy, the 

 capacitor must be charged at least to a voltage of 

The minimum sampling time 

 for a given 

can be found using this formula:

for a 12 bits accuracy: 

where

Notes:

1.

These values are based on specifications otherwise noted.

2.

These values are based on characterization. These values are not covered by test limits in production.

R

SOURCE

R

SAMPLE

Analog Input 

AINx

C

SAMPLE

V

IN

VDDANA/2

≥

1

2

1

+

(

)

–

–

(

)

×

+

(

)

(

)

×

1

+

(

)

2

( )

ln

×

×

≥

+

(

)

(

)

×

9.02

×

≥

1

2

×

---------------------

=

V

DDANA

Analog supply voltage

I

1.62

-

3.63

V

AV

REF

External reference voltage

I

1.0

-

V

DDANA

-0.6

V

Internal reference voltage 1

-

1

-

V

Internal reference voltage 2

-

V

DDANA

-

V

I

Linear output voltage range

I

0.05

-

V

DDANA

-0.05

V

I

Minimum resistive load

I

5

-

-

k

Ω

I

Maximum capacitance load

I

-

-

100

pF

i

DD

DC supply current

Voltage pump disabled

-

160

230

µA