STM32-nucleo-adc-opamp.zip

Design by: 8475

A shield for the STM32 Nucleo-64 boards featuring a high speed rail-to-rail opamp (AD8027) in inverting mode for analog signal conditioning for the ADC-input.

The PSU-section of the circuit uses a charge pump (LM2662) and two low noise low drop-out regulators (LT1761-BYP and LT1964-BYP) to deliver ±4.65V for the opamp.

• C1,C2:   47uF low ESR (Kemet T520 or equiv.)
• C3,C6:   1uF 0805
• C4,C7:   10nF 0805
• C5,C8:   10uF 1206
• C9,C10: 0.1uF 0805
• C11:     RC-output filter cap
• R1,R3:  21k 0805
  
• R2,R4:  59k 0805
  
• R5-R11: ADC resistors (input, feedback etc )