Texas Instruments TAS5001-5122C2EVM, User Manual

Description of Switches and Buttons

2-7

Detailed Description of the EVM

2.5

Description of Switches and Buttons

2.5.1

S/PDIF Input Selector Switch (S100)

S100 switches between optical and coaxial S/PDIF input. When the lever is
pressed in the direction of J101, the optical S/PDIF input is selected. When the
lever is pressed in the direction of J100, the coaxial S/PDIF input is selected.

2.5.2

Bypass Digital Audio Processor Switch (S320)

When the lever is pressed in the direction of S341, the DAP is bypassed. When
the lever is pressed in the direction of U360 (TAS3002), the DAP is in the signal
path. Below S320 is a label (DAP ON), which indicates the position of the lever
for the DAP inserted in signal path.

Warning 

Bypassing the DAP is equal to maximum output power (attenuation = 0 dB). This
might be loud and could possible damage your loudspeaker and hearing.

2.5.3

Reset Board Button (S620)

This is the master RESET for the EVM board. While this button is held down,
the DIR1703, TAS3002, TAS5001, and TAS5122DCA are held RESET and
latching errors are cleared. Note that while the RESET button is held down,
the No S/PDIF LED lights up, even if a valid S/PDIF input signal is present,
because the DIR1703 S/PDIF receiver is held RESET.

2.5.4

Mute Button (S240)

The output stage is muted (not switching) while this button is held down and
unmutes when it is released.

2.5.5

Volume Control (S340 and S341)

S341 and S340: Volume control of TAS3002 DAP. Press and hold the S341
button to decrease output power level. Press and hold the S340 button to
increase output power level.

Note:

Change of listening level is slow. It takes approximately 25 seconds to
change attenuation from –70 dB to 0 dB.

The TAS3002 device implements a soft volume control. This feature allows a
change from one volume level to another over the entire range of volume
control (+18 dB to mute). Above 0 dB, there is risk of signal clipping. Distortion
of output signals is the result of signal clipping.

Note:

Significant signal clipping might result in activation of the overcurrent
protection system.