AT90PWM216_14 Datasheet, PDF (222/344 Pages) ATMEL Corporation – Atmel 8-bit Microcontroller with 16K Bytes In-System Programmable Flash

20. Analog to Digital Converter - ADC
20.1
Features
• 10-bit Resolution
• 0.5 LSB Integral Non-linearity
• ± 2 LSB Absolute Accuracy
• 8- 320 µs Conversion Time
• Up to 125 kSPS at Maximum Resolution
• 11 Multiplexed Single Ended Input Channels
• Two Differential input channels with accurate programmable gain 5, 10, 20 and 40
• Optional Left Adjustment for ADC Result Readout
• 0 - V_CC ADC Input Voltage Range
• Selectable 2.56 V 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
The AT90PWM216/316 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 2 differential voltage input combinations which are equipped with a programmable gain
stage, providing amplification steps of 14dB (5x), 20 dB (10x), 26 dB (20x), or 32dB (40x) 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
level during conversion. A block diagram of the ADC is shown in Figure 20-1.
The ADC has a separate analog supply voltage pin, AV_CC. AV_CC must not differ more than ± 0.3V from V_CC. See
the paragraph “ADC Noise Canceler” on page 228 on how to connect this pin.
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.
AT90PWM216/316 [DATASHEET] 222
7710H–AVR–07/2013