By default, the EVM is configured with a 50 Ω series load AC coupled to the output. To use the EVM with the onboard 1VDC output bias, populate R8 and short the EN jumper with the included shunt to enable the LP5912 regulator. To apply an external bias to the output, populate R8 and drive the desired voltage on the VREF test point. For more details and instructions on how to reconfigure the EVM, see the applications section, schematics, and layouts in the 275-MHz, Single-Ended Output, Transimpedance Amplifier with Integerated Clamp data sheet.