SAM7X128_14 Datasheet, PDF (592/662 Pages) ATMEL Corporation – ARM-based Flash MCU

38.7 ADC Characteristics
Table 38-15. Channel Conversion Time and ADC Clock
Parameter
Conditions
ADC Clock Frequency
10-bit resolution mode
ADC Clock Frequency
8-bit resolution mode
Startup Time
Return from Idle Mode
Track and Hold Acquisition Time
Conversion Time
ADC Clock = 5 MHz
Conversion Time
ADC Clock = 8 MHz
Throughput Rate
ADC Clock = 5 MHz
Throughput Rate
ADC Clock = 8 MHz
Min
Typ
Max
Units
5
MHz
8
MHz
20
µs
600
ns
2
µs
1.25
384⁽¹⁾
533⁽²⁾
µs
kSPS
kSPS
Notes: 1. Corresponds to 13 clock cycles at 5 MHz: 3 clock cycles for track and hold acquisition time and 10 clock cycles for
conversion.
2. Corresponds to 15 clock cycles at 8 MHz: 5 clock cycles for track and hold acquisition time and 10 clock cycles for
conversion.
Table 38-16. External Voltage Reference Input
Parameter
Conditions
Min
ADVREF Input Voltage Range
2.6
ADVREF Input Voltage Range
8-bit resolution mode
2.5
ADVREF Average Current
On 13 samples with ADC Clock = 5 MHz
Current Consumption on VDDIN
Typ
200
0.55
Max
V_DDIN
V_DDIN
250
1
Units
V
V
µA
mA
Table 38-17. Analog Inputs
Parameter
Input Voltage Range
Input Leakage Current
Input Capacitance
Min
Typ
Max
Units
0
V_ADVREF
1
µA
12
14
pF
The user can drive ADC input with impedance up to:
 Z_OUT ≤ (SHTIM -470) x 10 in 8-bit resolution mode
 Z_OUT ≤ (SHTIM -589) x 7.69 in 10-bit resolution mode
with SHTIM (Sample and Hold Time register) expressed in ns and Z_OUT expressed in ohms.
Table 38-18. Transfer Characteristics
Parameter
Conditions
Min
Typ
Max
Units
Resolution
10
Bit
Integral Non-linearity
±2
LSB
Differential Non-linearity
No missing code
±1
LSB
Offset Error
±2
LSB
Gain Error
±2
LSB
Absolute Accuracy
±4
LSB
For more information on data converter terminology, please refer to the application note: Data Converter Terminology,
Atmel lit° 6022.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
592