Datasheet

145
XMEGA C3 [DATASHEET]
8492F–AVR–07/2013
33.5.6 ADC characteristics
Table 33-124. Power supply, reference and input range.
Table 33-125.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 AV
CC
- 0.6
R
in
Input resistance Switched 4.5 k
C
in
Input capacitance Switched 5 pF
R
AREF
Reference input resistance (leakage only) >10 M
C
AREF
Reference input capacitance Static load 7 pF
Vin
Input range 0 V
REF
VConversion range Differential mode, Vinp - Vinn -V
REF
V
REF
Conversion range Single ended unsigned mode, Vinp -V V
REF
-V
V Fixed offset voltage 200 lsb
Symbol Parameter Condition Min. Typ. Max. Units
Clk
ADC
ADC Clock frequency
Maximum is 1/4 of peripheral clock frequency 100 1800
kHz
Measuring internal signals 100 125
f
ClkADC
Sample rate 16 300
ksps
f
ADC
Sample rate
Current limitation (CURRLIMIT) off 16 300
CURRLIMIT = LOW 16 250
CURRLIMIT = MEDIUM 16 150
CURRLIMIT = HIGH 16 50
Sampling time
Configurable in steps of 1/2 Clk
ADC
cycles up to
32 Clk
ADC
cycles
0.28 320 µs
Conversion time (latency)
(RES+2)/2+1+ GAIN
RES (Resolution) = 8 or 12, GAIN=0 to 3
5.5 10
Clk
ADC
cyclesStart-up time ADC clock cycles 12 24
ADC settling time After changing reference or input mode 7 7