at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 769

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

41.6
Table 41-18. Channel Conversion Time and ADC Clock
Note:
To achieve optimal performance of the ADC, the analog power supply VDDANA and the ADVREF input voltage must be
decoupled with a 4.7µF capacitor in parallel with a 100 nF capacitor
Table 41-19. External Voltage Reference Input
Table 41-20. Analog Inputs
Table 41-21. Transfer Characteristics
6384B–ATARM–15-Dec-08
Parameter
ADC Clock Frequency
Startup Time
Track and Hold Acquisition Time
Conversion Time
Throughput Rate
Parameter
ADVREF Input Voltage Range
ADVREF Average Current
Current Consumption on VDDANA
Parameter
Input Voltage Range
Input Leakage Current
Input Capacitance
Parameter
Resolution
Integral Non-linearity
Differential Non-linearity
Offset Error
Gain Error
ADC
1. In worst case, the Track-and-Hold Acquisition Time is given by:
In case of very high input impedance, this value must be respected in order to guarantee the correct converted value. An
internal input current buffer supplies the current required for the low input impedance (1 mA max)
TTH (µs)
=
1,2
+
(
0,09
×
Z
IN
) kOhm
(
Conditions
Conditions
10-bit resolution mode
Return from Idle Mode
ADC Clock = 5 MHz
ADC Clock = 5 MHz
ADC Clock = 5 MHz
)
.
AT91SAM9G20 Preliminary
Min
Min
2.4
0
1.2
Min
Min
-0.9
(1)
Typ
Typ
300
8
Typ
Typ
10
2
.
ADVREF
VDDANA
Max
Max
220
620
Max
Max
312
1
15
±2
+1
±2
±2
5
Units
Units
kSPS
Units
Units
MHz
LSB
LSB
LSB
LSB
µA
pF
µs
µs
µs
µA
µA
V
bit
V
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