SBOU252 August   2021 OPA4991 , OPA4991-Q1 , TLV9004 , TLV9004-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2DYY-AMP-EVM Kit Contents
  4. 3Circuit Configurations
  5. 4Schematic and PCB Layout
    1. 4.1 Schematic
    2. 4.2 Difference Amplifier
    3. 4.3 Non-inverting Amplifier
    4. 4.4 Inverting Amplifier
    5. 4.5 PCB Layout
  6. 5Connections
    1. 5.1 Power
    2. 5.2 Input Connections
    3. 5.3 Output Connections
    4. 5.4 Reference Voltage Connections
  7. 6Bill of Materials (BOM)
  8. 7References

4.3 Non-inverting Amplifier

Figure 4-5 displays the schematic for the non-inverting amplifier circuit configuration. To configure the EVM in a non-inverting configuration short RINP using a 0-Ω resistor or solder bridge, leave RVREF and CVREF unpopulated, and ground the input connection IN–. The input signal is applied directly to the high impedance non-inverting input terminal using the IN+ connection on the EVM.

Figure 4-5 Non-inverting Amplifier Schematic

Table 4-3 Non-inverting Amplifier Components
CH RINM RF

CF

 RINP

RIso

CL
1 R1 R2

C3

 R3

R5

C5
2 R7 R8

C6

 R9

R11

C8
3 R13 R14

C9

 R15

R17

C11
4 R19 R20

C12

 R21

R23

C14

Equation 4 displays the DC transfer function of the non-inverting amplifier circuit configuration shown in Figure 4-5. Note, Input signals IN+ and IN- are altered to INP and INM respectively in the transfer function for simplicity of the equation.

Equation 4. OUT = 1 + R F R INM × IN P

Capacitor CF provides the option to filter the output. The cutoff frequency, fc, of the filter can be calculated using Equation 5.

Equation 5. f c = 1 2 × π × R F × C F

Resistor Riso, and capacitor CL provide the option to create a RC filter, or test output loads for the amplifier. When not applicable, use a zero ohm resistor for Riso and do not populate CL.

Figure 4-6 displays the DYY-AMP-EVM populated with the required components to configure channel 1 as a non-inverting amplifier with no load.

Figure 4-6 Non-inverting Amplifier Configured on DYY-AMP-EVM, Channel 1