Datasheet

XMEGA A4U [DATASHEET]
Atmel-8387G-AVR-ATxmega16A4U-34A4U-64A4U-128A4U-Datasheet_03/2014
120
36.3.6 ADC characteristics
Table 36-72. Power supply, reference and input range.
Table 36-73. Clock and timing.
Symbol Parameter Condition Min. Typ. Max. Units
AV
CC
Analog supply voltage V
CC
- 0.3 V
CC
+ 0.3 V
V
REF
Reference voltage 1.0 AV
CC
- 0.6 V
R
in
Input resistance Switched 4.0 k
C
sample
Input capacitance Switched 4.4 pF
R
AREF
Reference input resistance (leakage only) >10 M
C
AREF
Reference input capacitance Static load 7.0 pF
V
IN
Input range -0.1 AV
CC
+0.1 V
Conversion range Differential mode, Vinp - Vinn -V
REF
V
REF
V
Conversion range Single ended unsigned mode, Vinp -V V
REF
-V V
ΔV Fixed offset voltage 190 lsb
Symbol Parameter Condition Min. Typ. Max. Units
Clk
ADC
ADC clock frequency
Maximum is 1/4 of peripheral clock
frequency
100 2000
kHz
Measuring internal signals 100 125
f
ADC
Sample rate
Current limitation (CURRLIMIT) off 100 2000
ksps
CURRLIMIT = LOW 100 1500
CURRLIMIT = MEDIUM 100 1000
CURRLIMIT = HIGH 100 500
Sampling time 1/2 Clk
ADC
cycle 0.25 5 µs
Conversion time (latency)
(RES+2)/2+(GAIN !=0)
RES (Resolution) = 8 or 12
5 8
Clk
ADC
cycles
Start-up time ADC clock cycles 12 24
Clk
ADC
cycles
ADC settling time
After changing reference or input mode 7 7
Clk
ADC
cycles
After ADC flush 1 1