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which can result in additional distortion. However, with the relatively small input voltage swing present when
the preamplifier is set to gains between 9 dB and 60 dB, the effect on the THD+N of the PGA2505 is small
or negligible. For unity-gain applications, where the voltage swing may become large enough in magnitude to
transition over a greater portion of the diodes nonlinear capacitance, the THD+N ratio may degrade by as much
as 3 dB from the published typical performance specifications.
4.6 Configurable Input Circuitry
The configurable portion of the input circuit includes R5, R6, R8, R13, R15, R16, Cc1, and Cc2. These
components support prototyping of additional circuitry, such as pads and filters. During assembly at the factory,
resistors R8 and R13 are not installed, while R5, R6, R15, R16, Cc1, and Cc2 are replaced by 0-Ω shunt
resistors.
4.7 Configurable Output Circuitry and Preamp Output Connector
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.
SBOU259 – OCTOBER 2021
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Setup Guide
PGA2505EVMV2 Evaluation Module
11
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