Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

1154

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 MΩ.

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 reference resistor bridge

6

8

10

kΩ

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

20

4

30

8

40
12

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

SETTLE

Settling Time

Settling time to change offset and gain

100

—

—

ns

t

CAL

Calibration time

200

—

—

ns