Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002058A-page 86
ATxmega128A1U/ATxmega64A1U
37.1.6 ADC characteristics
Table 37-8. Power supply, reference and input range.
Table 37-9. 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
R
in
Input resistance Switched 5.0 k
C
in
Input capacitance Switched 5.0 pF
R
AREF
Reference input resistance (leakage only) >10 M
C
AREF
Reference input capacitance Static load 7 pF
V
IN
Input range -0.1
AV
CC
+0.
1
V
Conversion range Differential mode, Vinp - Vinn -V
REF
V
REF
V
IN
Conversion range Single ended unsigned mode, Vinp -V V
REF
-V
V 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