
916
32142D–06/2013
ATUC64/128/256L3/4U
35.9.6
Analog to Digital Converter Characteristics
Note:
These values are based on simulation and characterization of other AVR microcontrollers manufactured in the same process
technology. These values are not covered by test limits in production.
35.9.6.1
Inputs and Sample and Hold Acquisition Times
Note:
1. These values are based on simulation and characterization of other AVR microcontrollers manufactured in the same pro-
cess technology. These values are not covered by test limits in production.
The analog voltage source must be able to charge the sample and hold (S/H) capacitor in the
ADC in order to achieve maximum accuracy. Seen externally the ADC input consists of a resis-
tor (
) and a capacitor (
). In addition, the resistance (
) and capacitance
Table 35-29. ADC Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Units
f
ADC
ADC clock frequency
12-bit resolution mode
6
MHz
10-bit resolution mode
6
8-bit resolution mode
6
tSTARTUP
Startup time
Return from Idle Mode
15
s
t
CONV
Conversion time (latency)
f
ADC = 6 MHz
11
26
cycles
Throughput rate
VVDD > 3.0V, fADC = 6MHz,
12-bit resolution mode,
low impedance source
28
kSPS
V
VDD > 3.0 V, fADC = 6 MHz,
10-bit resolution mode,
low impedance source
460
VVDD > 3.0V, fADC = 6MHz,
8-bit resolution mode,
low impedance source
460
VADVREFP
Reference voltage range
VADVREFP = VVDDANA
1.62
1.98
V
IADC
Current consumption on VVDDANA
ADC Clock = 6MHz
350
A
IADVREFP
Current consumption on ADVREFP
pin
fADC = 6MHz
150
Table 35-30. Analog Inputs
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VADn
Input Voltage Range
12-bit mode
0VADVREFP
V
10-bit mode
8-bit mode
C
ONCHIP
22.5
pF
RONCHIP
VVDDIO = 3.0V to 3.6V,
V
VDDCORE = 1.8 V
3.15
kOhm
VVDDIO = VVDDCORE = 1.62V to 1.98V
55.9
R
ONCHIP
C
ONCHIP
R
SOURCE