Datasheet

48
32059L–AVR32–01/2012
AT32UC3B
9.8 ADC Characteristics
Notes: 1. Corresponds to 13 clock cycles: 3 clock cycles for track and hold acquisition time and 10 clock cycles for conversion.
2. Corresponds to 15 clock cycles: 5 clock cycles for track and hold acquisition time and 10 clock cycles for conversion.
Note: 1. ADVREF should be connected to GND to avoid extra consumption in case ADC is not used.
Table 9-20. Channel Conversion Time and ADC Clock
Parameter Conditions Min. Typ. Max. Unit
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
Track and Hold Input Resistor 350
Ω
Track and Hold Capacitor 12 pF
Conversion Time
ADC Clock = 5 MHz 2 µs
ADC Clock = 8 MHz 1.25 µs
Throughput Rate
ADC Clock = 5 MHz 384
(1)
kSPS
ADC Clock = 8 MHz 533
(2)
kSPS
Table 9-21. External Voltage Reference Input
Parameter Conditions Min. Typ. Max. Unit
ADVREF Input Voltage Range
(1)
2.6 VDDANA V
ADVREF Average Current On 13 samples with ADC Clock = 5 MHz 200 250 µA
Current Consumption on VDDANA On 13 samples with ADC Clock = 5 MHz 1 mA
Table 9-22. Analog Inputs
Parameter Conditions Min. Typ. Max. Unit
Input Voltage Range 0 V
ADVREF
V
Input Leakage Current 1µA
Input Capacitance 7pF
Table 9-23. Transfer Characteristics in 8-bit Mode
Parameter Conditions Min. Typ. Max. Unit
Resolution 8Bit
Absolute Accuracy
ADC Clock = 5 MHz 0.8 LSB
ADC Clock = 8 MHz 1.5 LSB
Integral Non-linearity
ADC Clock = 5 MHz 0.35 0.5 LSB
ADC Clock = 8 MHz 0.5 1.0 LSB