Datasheet

1437
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
47.7 12-bit AFE (Analog Front End) Characteristics
Electrical data are in accordance with the following standard conditions unless otherwise specified:
 Operating temperature range from -40°C to + 105°C
 Min and max data are defined as three times the standard deviation of the manufacturing process
Figure 47-14. 12-bit AFE (Analog Front End) Diagram
47.7.1 ADC Power Supply
Notes: 1. See Section 47.7.5.3 “ADC Channel Input Impedance”.
2. In Sleep mode the ADC core, sample and hold, and internal reference operational amplifier are off.
3. In Fast Wake-up mode, only the ADC core is off.
47.7.1.1 ADC Bias Current
All current consumption is performed when the field IBCTL in the AFEC Control register (AFEC_ACR) is set to 01.
IBCTL controls the ADC biasing current, with the nominal setting IBCTL = 01.
IBCTL = 01 is the default configuration suitable for a sampling frequency of up to 1 MHz. If the sampling frequency
is below 500 kHz, IBCTL = 00 can also be used to reduce the current consumption.
S&H
+
-
ADC
12bits
PGA
Sample and hold
Analog mux Prog gain
amplifier
A/D Converter
DAC
12bits
MUX
D/A Converter
Analog offset
cancelation
12b
12b
AFEx (x=[0;1])
ADV REF
Table 47-27. Analog Power Supply Characteristics
Symbol Parameter Conditions Min Typ Max Unit
V
VDDIN
Supply Voltage Range
Full operational 2.4 — 3.6
V
(1)
2—2.4
I
VDDIN
Analog Current
Consumption
ADC Sleep Mode
(2)
ADC Fast Wake-up Mode
(3)
ADC Normal Mode
—
4
1.8
3.8
8
3
6
µA
mA
mA
I
VDDcore
Digital Current
Consumption
ADC Sleep Mode (all off)
(2)
ADC Normal Mode
—
—
0.2
0.1
0.4
µA
mA
Table 47-28. ADC Bias Current Adjustment
IBCTL=00 IBCTL=01 IBCTL=10 IBCTL=11
Typ-22% Typ Reserved Reserved