SBAU375 November   2021

 

  1.   Trademarks
  2. 1EVM Overview
    1. 1.1 Introduction
  3. 2Analog Interface
    1. 2.1 Analog Inputs
    2. 2.2 Comparator Outputs
  4. 3Power Supplies
    1. 3.1 VDD Inputs
  5. 4EVM Operation
    1. 4.1 Analog Inputs: J4
    2. 4.2 User Power: J1 and J2
    3. 4.3 Comparator Outputs: J3
    4. 4.4 Device Operation
  6. 5Layout, BOM, and Schematic
    1. 5.1 Layout
    2. 5.2 Bill of Materials (BOM)
    3. 5.3 Schematic

4.1 Analog Inputs: J4

The analog input to the AMC23CxxEVM board can be applied directly to the three-wire screw terminal J4.

Table 4-1 summarizes the details of J2.

Table 4-1 J4: Analog Inputs
Pin Number Signal Description
J4.1 IN/IN+ Single-ended comparator input or positive differential comparator input (AMC23C10 only) to the AMC23Cxx device (pin 2)
J4.2 REF/IN– Comparator reference input or negative differential comparator input (AMC23C10 only) to the AMC23Cxx device (pin 3)

On the AMC23C14EVM, AMC23C12EVM, and AMC23C11EVM, the resistor R7 is used to set the external comparator reference voltage, VREF. By default R7 has a value of 2.55 kΩ, which sets a VREF of 255 mV when combined with the internal 100-μA current source of the AMC23Cxx device.