SBOU277 November 2021 OPA2863A
The DEM-OPA-DSN-EVM is equipped with footprints for SMA connectors for connection of signal generators and analysis equipment. For best results, the input and output to the EVM should be terminated to 50-Ω impedances and signals must be routed to and from the EVM with cables having 50-Ω characteristic impedance. INA+ (J2) and INB+ (J5) include termination resistors R5 and R15 respectively for non-inverting configurations. For inverting configurations an resistor network (R1, R2, and R3 for amplifier A; R11, R12, and R13 for amplifier B) is included to match the input impedance while maintaining a desired gain resistor value. OUTA (J3) and OUTB (J6) are the output connectors for amplifiers A and B respectively. A resistor network (R8, R9, and R10 for amplifier A; R18, R19, and R20 for amplifier B) at the output of the amplifiers can be used to convert the signal to 50-Ω single-ended source while providing a larger total load to the amplifier when terminated with 50-Ω load at J3 and J6.