![](http://datasheet.mmic.net.cn/100000/IF180C52TXXX-20R_datasheet_3493957/IF180C52TXXX-20R_788.png)
788
32099I–01/2012
AT32UC3L016/32/64
32.8.6
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.
32.8.6.1
Inputs and Sample and Hold Aquisition Time
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.
An analog voltage input 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 resistor
(
) and a capacitor (
). In addition the resistance (
) and capacitance
(
) of the PCB and source must be taken into account when calculating the sample and
hold time.
Figure 32-7 shows the ADC input channel equivalent circuit.
Table 32-28. ADC Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Units
f
ADC
ADC clock frequency
10-bit resolution mode
6
MHz
8-bit resolution mode
6
t
STARTUP
Startup time
Return from Idle Mode
15
s
t
CONV
Conversion time (latency)
f
ADC = 6 MHz
11
26
cycles
Throughput rate
V
VDD > 3.0 V, fADC = 6 MHz,
10-bit resolution mode,
low impedance source
460
kSPS
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
300
A
IADVREFP
Current consumption on ADVREFP
pin
fADC = 6MHz
250
Table 32-29. Analog Inputs
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
ADn
Input Voltage Range
10-bit mode
0V
ADVREFP
V
8-bit mode
C
ONCHIP
21.5
pF
RONCHIP
V
VDDIO = 3.0 V to 3.6 V,
V
VDDCORE = 1.8 V
2.55
kOhm
V
VDDIO = VVDDCORE = 1.62 V to 1.98 V
55.3
RONCHIP
CONCHIP
RSOURCE
CSOURCE