SAM3N0C Atmel Corporation, SAM3N0C Datasheet - Page 717

• Manufacturer Part Number: SAM3N0C
• Manufacturer: Atmel Corporation

Table 35-29. External Voltage Reference Input
Table 35-30. Analog Inputs
Note:
35.6.0.3
35.6.0.4
11011A–ATARM–04-Oct-10
Parameter
ADVREF Input Voltage Range
ADVREF Input Voltage Range
ADVREF Average Current
Parameter
Input Voltage Range
Input Leakage Current
Input Capacitance
1. Input Voltage range can be up to VDDIN without destruction or over-consumption.
If VDDIO < V
Track and Hold Time versus Source Output Impedance
ADC Application Information
ADVREF
.
The following figure gives a simplified acquisition path.
Figure 35-11. Simplified Acquisition Path
The user can drive ADC input with impedance of Zsource up to:
with TRACKTIM (Track and Hold Time register) expressed in ns and Zsource expressed in
ohms.
Note:
For more information on data converter terminology, please refer to the application note:
Data Converter Terminology, Atmel lit° 6022.
http://www.atmel.com/dyn/resources/prod_documents/doc6022.pdf
• In 8-bit mode: TRACKTIM = 0.1 x Zsource + 470
• In 10-bit mode: TRACKTIM = 0.13 x Zsource + 589
, max input voltage is VDDIO.
Csample and Ron are taken into account in the formulas
Conditions
8-bit resolution mode
On 13 samples with ADC Clock = 5 MHz
Zsource
Input
ADC
Mux.
Ron
Sample & Hold
Csample
Min
Min
2.6
2.5
0
Typ
Typ
200
12
10-bit
ADC
Core
V
ADVREF
V
V
Max
Max
250
±1
14
DDIN
DDIN
SAM3N
Units
Units
µA
µA
pF
V
V
717