8-bit AVR Microcontroller

ADC Characteristics

Table 1. ADC Characteristics
Symbol Parameter Condition Min(1) Typ(1) Max(1) Units
  Resolution Single Ended Conversion   10   Bits
    Differential Conversion

Gain = 1x or 20x

  8   Bits
    Differential Conversion

Gain = 200x

  7   Bits
  Absolute accuracy (Including INL, DNL, Quantization Error, Gain, and Offset Error) Single Ended Conversion

VREF = 4V, VCC = 4V

ADC clock = 200kHz

  1.75   LSB
  Single Ended Conversion

VREF = 4V, VCC = 4V

ADC clock = 1MHz

  3   LSB
  Integral Non-linearity (INL) Single Ended Conversion

VREF = 4V, VCC = 4V

ADC clock = 200kHz

  0.75   LSB
  Differential Non-linearity (DNL) Single Ended Conversion

VREF = 4V, VCC = 4V

ADC clock = 200kHz

  0.5   LSB
  Gain Error Single Ended Conversion

VREF = 4V, VCC = 4V

ADC clock = 200kHz

  1   LSB
  Offset Error Single Ended Conversion

VREF = 4V, VCC = 4V

ADC clock = 200kHz

  1   LSB
  Conversion Time(4) Free Running Conversion 13   260 μs
  Clock Frequency   50   1000 kHz
AVCC Analog Supply Voltage   VCC - 0.3(2)   VCC + 0.3(3) V
VREF Reference Voltage   2.0   AVCC V
      2.0   AVCC - 0.2 V
VIN Input voltage   GND   VREF V
      TBD   TBD  
  Input bandwidth     38.5   kHz
    Differential channels   4   kHz
VINT Internal Voltage Reference   2.3 2.56 2.8 V
RREF Reference Input Resistance     32  
RAIN Analog Input Resistance   55 100  
Notes:
  1. 1.Values are guidelines only.
  2. 2.Minimum for AVCC is 2.7V.
  3. 3.Maximum for AVCC is 5.5V.
  4. 4.Maximum conversion time is 1/50kHz*25 = 0.5ms.