SBOU259 October 2021 PGA2505
The configurable portion of the output circuit includes R17, R18, R19, R20, R21, C13, C14, and C15. These components support prototyping of additional circuitry, such as pads and filters, as well as emulation of various loading conditions. During assembly at the factory, resistors R18 and R19 are replaced by 0-Ω shunt resistors. Resistors R17, R20, and R21, as well as capacitors C13 through C15, are not installed. The differential preamplifier output is provided at J4, a 3-pin male XLR connector, or at J6, a 1/4-inch TRS connector.