SAM7L128_14 Datasheet, PDF (521/549 Pages) ATMEL Corporation – AT91SAM ARM-based Flash MCU

35.6 ADC Characteristics
Table 35-23. Channel Conversion Time and ADC Clock
Parameter
Conditions
Min
Typ
Max
Units
ADC Clock Frequency
10-bit resolution mode
6
MHz
ADC Clock Frequency
8-bit resolution mode
10
MHz
Startup Time
Return from Idle Mode
15
µs
Track and Hold Acquisition Time
500
ns
Conversion Time
ADC Clock = 6MHz
ADC Clock = 10MHz
1.67
µs
1
Throughput Rate
ADC Clock = 6MHz
ADC Clock = 10MHz
460⁽¹⁾
660⁽²⁾
kSPS
Notes: 1. Corresponds to 13 clock cycles at 6 MHz: 3 clock cycles for track and hold acquisition time and 10 clock cycles for
conversion.
2. Corresponds to 15 clock cycles at 10 MHz: 5 clock cycles for track and hold acquisition time and 10 clock cycles for
conversion
Table 35-24. External Voltage Reference Input
Parameter
Conditions
ADVREF Input Voltage Range
ADVREF Average Current
ADC Clock = 6MHz
Current Consumption on VDDCORE
Min
Typ
Max
Units
1.65
1.8
VDDCORE
V
250
µA
2.2
mA
The user can drive ADC input with impedance up to:
• Z_OUT ≤ (SHTIM -440) x 20 in 8-bit resolution mode
• Z_OUT ≤ (SHTIM -550) x 16.6 in 10-bit resolution mode
with SHTIM (Sample and Hold Time register) expressed in ns and Z_OUT expressed in ohms.
Table 35-25. Analog Inputs
Parameter
Input Voltage Range
Input Leakage Current
Input Capacitance
Min
Typ
Max
Units
0
V_ADVREF
±0.5
µA
6.5
8.5
pF
Table 35-26. Transfer Characteristics
Parameter
Resolution
Integral Non-linearity
Differential Non-linearity
Conditions
No missing code
Min
Typ
Max
Units
10
Bit
±2
LSB
±1
LSB
SAM7L128/64 [DATASHEET]
6257B–ATARM–01-Feb-13
521