Datasheet

DRAFT
1403
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
45.7 12-bit ADC Characteristics
Notes: 1. Use ADC_ACR.IBCTL = 00 for sampling frequency below 500 kHz.
2. Use ADC_ACR.IBCTL = 01 for sampling frequency between 500 kHz and 1 MHz.
Table 45-29. Analog Power Supply Characteristics
Symbol Parameter Conditions Min Typ Max Unit
V
DDIN
ADC Analog Supply
12-bit or 10-bit resolution 2.4 3.0 3.6 V
10-bit resolution 2.0 3.6 V
V
rip(max)
Max. Voltage Ripple RMS value, 10 kHz to 20 MHz 20 mV
I
VDDIN
Current Consumption
Sleep Mode
Fast Wake Up Mode
Normal Mode (ADC_ACR.IBCTL = 00)
(1)
Normal Mode (ADC_ACR.IBCTL = 01)
(2)
0.1
1.8
4.7
6
1
2.6
7.1
9
µA
mA
mA
mA
Table 45-30. Channel Conversion Time and ADC Clock
Symbol Parameter Conditions Min Typ Max Unit
f
ADC
ADC Clock Frequency 1 22 MHz
t
CP_ADC
ADC Clock Period 50 1000 ns
f
S
Sampling Frequency 0.05 1 MHz
t
START
ADC Startup time
From OFF Mode to Normal Mode:
- Voltage Reference OFF
- Analog Circuitry OFF
From Standby Mode to Normal Mode:
- Voltage Reference ON
- Analog Circuitry OFF
20
4
30
8
40
12
µs
t
TRACK
Track and Hold Time
See Section 45.7.2.1 “Track and Hold Time
versus Source Output Impedance” for more
details
160 ns
t
CONV
Conversion Time 20 t
CP_ADC
t
s
Settling time to change offset
and gain
200 ns
Table 45-31. External Voltage Reference Input
Parameter Conditions Min Typ Max Unit
ADVREF Input Voltage Range, 12-bit 2.4V < V
DDIN
< 3.6V 2.4 V
DDIN
V
ADVREF Input Voltage Range, 10-bit 2.0V < V
DDIN
< 3.6V 2.0 V
DDIN
V
ADVREF Current 250 µA
ADVREF Input DC impedance 14 kΩ