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ATmega16M1/32M1/64M1 [DATASHEET]
8209E–AVR–11/2012
21. ADC – Analog to Digital Converter
21.1
Features
10-bit resolution
0.5 LSB integral non-linearity
±2 LSB absolute accuracy
8s - 250s conversion time
Up to 120ksps at maximum resolution
11 multiplexed single ended input channels
Three differential input channels with accurate (5%) programmable gain 5, 10, 20 and 40
Optional left adjustment for ADC result readout
0 - V
CC ADC input voltage range
Selectable 2.56V ADC reference voltage
Free running or single conversion mode
ADC start conversion by auto triggering on interrupt sources
Interrupt on ADC conversion complete
Sleep mode noise canceler
Temperature sensor
LiN address sense (ISRC voltage measurement)
V
CC voltage measurement
The Atmel ATmega16M1/32M1/64M1 features a 10-bit successive approximation ADC. The ADC is connected to
an 15-channel Analog Multiplexer which allows eleven single-ended input. The single-ended voltage inputs refer to
0V (GND).
The device also supports three differential voltage input amplifiers which are equipped with a programmable gain
stage, providing amplification steps of 14dB (5×), 20dB (10×), 26dB (20×), or 32dB (40×) on the differential input
voltage before the A/D conversion. On the amplified channels, 8-bit resolution can be expected.
The ADC contains a Sample and Hold circuit which ensures that the input voltage to the ADC is held at a constant
The ADC has a separate analog supply voltage pin, AV
CC. AVCC must not differ more than ±0.3V from VCC. See
Internal reference voltages of nominally 2.56V or AV
CC are provided On-chip. The voltage reference may be exter-
nally decoupled at the AREF pin by a capacitor for better noise performance.