![]() Seven differential analog input channels share a common negative terminal (ADC1), while any other ADC input can be selected as the positive input terminal. Two of the differential inputs (ADC1, ADC0 and ADC3, ADC2) are equipped with a programmable gain stage, providing amplification steps of 0 dB (1x), 20dB (10x), or 46dB (200x) on the differential input voltage before the A/D conversion. The device also supports 16 differential voltage input combinations. The single-ended voltage inputs refer to 0V (GND). The ADC is connected to an 8-channel Analog Multiplexer which allows 8 single-ended voltage inputs constructed from the pins of Port F. The Atmel ® AVR ®ATmega128 features a 10-bit successive approximation ADC. ![]() ![]()
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