SAM7S256_14 Datasheet, PDF (574/775 Pages) ATMEL Corporation – ARM-based Flash MCU

37.9 ADC Characteristics
Table 37-18. Channel Conversion Time and ADC Clock
Parameter
Conditions
Min
Typ
Max
Units
ADC Clock Frequency
10-bit resolution mode
5
MHz
ADC Clock Frequency
8-bit resolution mode
8
MHz
Startup Time
Return from Idle Mode
20
µs
Track and Hold Acquisition Time
600
ns
Conversion Time
ADC Clock = 5 MHz
2
µs
Conversion Time
ADC Clock = 8 MHz
1.25
µs
Throughput Rate
ADC Clock = 5 MHz
384⁽¹⁾
kSPS
Throughput Rate
ADC Clock = 8 MHz
533⁽²⁾
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 37-19. 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 37-20. Analog Inputs
Parameter
Input Voltage Range
Input Leakage Current
Input Capacitance
Min
Typ
0
1
12
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 37-21. Transfer Characteristics
Parameter
Conditions
Min
Typ
Resolution
10
Integral Non-linearity
Differential Non-linearity
No missing code
Max
V_ADVREF
14
Max
±2
±1
Units
µA
pF
Units
Bit
LSB
LSB
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
574