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The TPA701 MSOP Audio Power Amplifier Evaluation Module
3-5
Details
The TPA701 amplifier IC, like most other amplifiers, exhibits its best distortion
and noise performance at lower gain levels (see the TPA701 data sheet). Even
so, the TPA701 at its highest gain setting has significantly less distortion than
most low-cost speakers.
Gain versus total harmonic distortion (THD) should be considered in each
application. Both the module input signal level and the TPA701 MSOP module
gain should be adjusted to obtain the lowest overall distortion level for a
particular overall gain. A quick rule of thumb (everything else being equal): the
module input signal level should be as high as possible without clipping or
overloading the TPA701 input, and the TPA701 gain should be kept as low as
possible.
3.2.4 Shutdown
When the shutdown terminal of the TPA701 amplifier IC is taken high, the IC
ceases operation and enters an ultra-low power state. This is accomplished
by applying a control signal to the module Shutdown pin or by pressing the
Shutdown switch, S1, on the module. When the control signal goes low or is
removed (or the switch is released), amplifier operation resumes.
The Plug-N-Play platform can generate the shutdown (mute) signal for the
module either when a plug is
inserted
into the platform headphone output jack
or when the plug is
removed
, as selected by a platform jumper (JP8).