User's Manual

Page 7Rev 1.1 MMB Networks 2013 MMB Module Data Sheet
• General purpose input
• General purpose input with pull-up or pull-down resistor
6.3 | Analog to Digital Converter (ADC)
The ADC is a first-order sigma-delta converter with the following features:
• Resolution of up to 14 bits
• Sample times as fast as 5.33 μs (188 kHz)
• Differential and single-ended conversions from six external and four internal sources
• One voltage range (differential): -VREF to +VREF
• Choice of internal or external VREF
• internal VREF may be output to PB0 or external VREF may be derived from PB0
• Digital offset and gain correction
• Dedicated DMA channel with one-shot and continuous operating modes
Parameter Min Typical Max Units
Conversion time 32 4096 μs
VREF 1.17 1.2 1.23 V
VREF output current 1 mA
VREF load capacitance 10 nF
External VREF voltage range 1.1 1.2 1.3 V
External VREF input impedance 1 M Ohm
Minimum input voltage (input buffer disabled) 0 V
Minimum input voltage (input buffer enabled) 0.1 V
Maximum input voltage (input buffer disabled) VREF V
Maximum input voltage (input buffer enabled) VCC – 0.1 V
Single-ended signal range (input buffer disabled) 0 VREF V
Single-ended signal range (input buffer enabled) 0.1 VCC – 0.1 V
Differential signal range (input buffer disabled) =-VREF =+VREF V
Differential signal range (input buffer enabled) =- VCC + 0.1 +VCC – 0.1 V
Common mode range (input buffer disabled) 0 VREF V
Common mode range (input buffer enabled) VCC/2 V
Input referred ADC offset -10 10 mV
Input impedance (1 MHz sample clock) 1 M Ohm
Input impedance (6 MHz sample clock) 0.5 M Ohm
Input impedance (Not Sampling) 10 M Ohm