Datasheet

1065
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
43.7 12-Bit ADC Characteristics
Note: Use IBCTL = 00 for Sampling Frequency below 500 kHz and IBCTL = 01 between 500 kHz and 1 MHz.
Table 43-30. Analog Power Supply Characteristics
Symbol Parameter Conditions Min Typ Max Units
V
VDDIN
ADC Analog Supply 12-bit or 10-bit resolution 2.4 3.0 3.6 V
ADC Analog Supply 10-bit resolution 2.0 — 3.6 V
Max. Voltage Ripple rms value, 10 kHz to 20 MHz — — 20 mV
I
VDDIN
Current Consumption
Sleep Mode (Clock OFF)
Fast Wake-up Mode (Standby CLK = 20
MHz, IBCTL = 01)
Normal Mode (IBCTL = 01)
—
2
2.4
4.3
4
3.5
6
μA
mA
mA
Table 43-31. Channel Conversion Time and ADC Clock
Symbol Parameter Conditions Min Typ Max Units
f
ADC
ADC Clock Frequency 1 — 20 MHz
t
CP_ADC
ADC Clock Period 50 — 1000 ns
f
S
Sampling Frequency — 1 MHz
t
START-UP
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
TRACKTIM
Track and Hold Time
See Section 43.7.1.1 “Track and Hold
Time versus Source Output
Impedance” for more details
160 — — ns
t
CONV
Conversion Time — 20 t
CP_ADC
t
cal
Calibration Time — — 306 t
CP_ADC
t
SETTLE
Settling Time Settlling time to change offset and gain 200 — — ns
Table 43-32. External Voltage Reference Input
Parameter Conditions Min Typ Max Units
ADVREF Input Voltage Range, 12-bit 2.4V < V
VDDIN
< 3.6V 2.4 — VDDIN V
ADVREF Input Voltage Range, 10-bit 2.0V < V
VDDIN
< 3.6V 2.0 — VDDIN V
ADVREF Input DC Impedance 6 8 10 kΩ