The OP8666 uses four (4) microcontroller internal ADC units, responsible for the conversion of 16 analog channels.
The OP8666 provides eight (8) 16-bit differential mode channels and eight (8) 12-bit single ended channels.
Each ADC channel has a pre-buffer stage, which sets high impedance to the input, while increasing the input voltage range to ±10V which is commonly used by most HIL simulators and high accuracy sensors.
Simultaneous sampling is possible only on channels belonging to different ADC units.
The 16-bit channels can convert at 1.1Msps, while the 12-bit channels can convert at 3.5Msps, when only a single channel of a particular ADC unit is used.
The following table provides essential information regarding the possible configurations of the ADC units.
ADC Units | Channel Count | Configuration | Min Acquisition Time (ns) | Min Sample Hold Time |
ADC-A | 3 | 16-Bit Differential | 320 | 29.5 ADC Clock Cycles |
ADC-B | 3 | 16-Bit Differential | 320 | 29.5 ADC Clock Cycles |
ADC-C | 2 | 16-Bit Differential | 320 | 29.5 ADC Clock Cycles |
ADC-D | 8 | 12-Bit Single Ended | 75 | 10.5 ADC Clock Cycles |
Input Equivalent Circuit
