Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Fiche De Données

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

1438

V

ADVREF

 is an external reference voltage applied on the pin ADVREF. The quality of the reference voltage V

ADVREF

is critical to the performance of the ADC. A DC variation of the reference voltage V

ADVREF

 is converted to a gain

error by the ADC. The noise generated by V

ADVREF

 is converted by the ADC to count noise. 

Notes:

1. See 

.

2. Over a bandwidth from 20 Hz to 20 MHz.

3. DIFF is Differential mode. 

4. SE is Single-ended mode.

5. When the ADC is in Sleep mode, the ADVREF impedance has a minimum of 10 M

Ω.

V

ADVREF

ADVREF voltage range

Full operational

2.4

—

3.6

V

2

—

2.4

V

N

Input voltage noise

Gain = 0.5, DIFF

 mode

—

—

1100

µVrms

Gain = 1, SE

 and DIFF

—

—

550

Gain = 2, SE

 and DIFF

—

—

274

Gain = 4, SE

 mode

—

—

137

R

ADVREF

ADVREF Input DC 
Impedance 

ADC+DAC reference resistor 
bridge

2.4

3

10

k

Ω

I

ADVREF

ADVREF Current 
(ADV

REF 

+ DAC Current)

ADVREF = 3V

—

1

1.5

mA

f

ADC

Clock Frequency

1

20

22

MHz

t

CP_ADC

Clock Period

45

50

1000

ns

f

S

Sampling Frequency

0.05

1

1.1

MHz

t

START-UP

ADC Startup time 

Sleep mode to Normal mode

Fast Wake-up mode to Normal mode

—

—

16

4

32

8

µs

t

TRACKTIM

Track Time

 f

ADC 

= max value

160

—

—

ns

t

CONV

Conversion Time

Number of ADC clock pulses to 
perform a conversion

—

20

—

t

CP_ADC

t

S

Settling Time

Settling time to change offset and gain

100

—

—

ns

t

CAL

Calibration time

200

—

—

ns