SBAU330C June   2019  – January 2022 AMC3301 , AMC3301-Q1 , AMC3302 , AMC3302-Q1 , AMC3330 , AMC3330-Q1

 

  1.   Trademarks
  2. 1EVM Overview
    1. 1.1 Features
    2. 1.2 Introduction
  3. 2Analog Interface
    1. 2.1 Analog Inputs
    2. 2.2 Analog Outputs
  4. 3Power Supplies
    1. 3.1 VDD Input
  5. 4EVM Operation
    1. 4.1 Analog Inputs: J2
    2. 4.2 User Power and Analog Output: J1 and J3
    3. 4.3 Device Operation
  6. 5Layout, BOM, and Schematic
    1. 5.1 Layout
    2. 5.2 Bill of Materials
    3. 5.3 Schematic
  7. 6Revision History

2.2 Analog Outputs

The analog outputs from the evaluation module are fully differential signals centered at a common-mode output voltage of 1.44 V. As Figure 2-2 shows, the outputs are available on the three screw terminals of J3. OUTP is available at J3.2 and swings from 0.5 V to 2.5 V when a negative to positive full-scale linear input signal is applied to the input. OUTN is available at J3.1 and swings from 2.5 V to 0.5 V when a negative to positive full-scale linear input signal is applied to the input.

The pads of R3, R5, C11, C10, and C13 allow users to install their own output filtering. Table 2-1 lists a few example filters. Common-mode filter capacitors C10 and C13 are recommended to be at least 20 times less than the differential filter capacitor, C11.

Table 2-1 Analog Output Filter Examples
Cutoff Frequency Resistance Differential Capacitor
100 kHz R3 = R5 = 100 Ω C11 = 8.2 nF
300 kHz R3 = R5 = 100 Ω C11 = 2.7 nF
600 kHz R3 = R5 = 100 Ω C11 = 1.3 nF
Use the differential output if the application allows. If a single-ended output is desired, consult the Interfacing a Differential-Output (Isolated) Amplifier to a Single-Ended Input ADC application report for help with designing the differential to single-ended circuit.

Figure 2-2 AMC3301, AMC3302, and AMC3330EVM Schematic: Analog Output Section