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Description
The audio EVM sockets are arranged into two stages on the platform (Figure
1–2): an input signal conditioning stage (socket U1) and an output power
amplifier stage (sockets U2 through U5). The signal conditioning EVM can
include such functions as volume and tone controls as well as the mixing of
several sources, and can be bypassed with a switch on the platform. The
output amplifier stage can be populated with a wide variety of EVMs, including
both single-channel and stereo units, and is intended to drive speakers and
headphones.
Figure 1–2. Functional Block Diagram
VDD
In/Out
JP5
VDD
VCC
U3
U6
Power
JP4
Mono
Amplifier
R
R
Supply
AC/DC
In
B1
9 -V Battery
Full-Wave
Bridge
Rectifier
PWR
JP3
JP2
S1
U2
Stereo
Amplifier
U4
R
L
L
Speaker
Output
VCC
In
JP1
Off
Mono
Amplifier
L
U3/U4
or U2
Audio
Input
R
U1
Signal
Conditioning
S2
U5
Stereo
Headphone
R
S3
R
Headphone
Output
Amplifier
L
L
On
L
U5
Signals are input through either a pair of RCA phono jacks (left and right
channels) or a miniature stereo phone jack. These inputs are grounded when
the jacks are not in use. Signal conditioning EVMs may have additional input
connectors, as in the case of the Microphone Mixer EVM (SLOP107), which
has a microphone input jack mounted on its circuit board.
The platform includes a pair of sockets for single-channel power amplifiers (U3
and U4) and a socket for a stereo power amplifier (U2). These sockets physi-
cally overlap each other such that either one or both mono amplifiers can be
installed, OR , a single stereo amplifier can be installed — but not any combina-
tion of stereo with mono amplifiers. Output to speakers is through a pair of RCA
phono jacks and compression connectors for use with stripped speaker wire.
Socket U5 is typically for a stereo headphone amplifier EVM. A miniature
stereo headphone jack is capacitively coupled to either the headphone
amplifier outputs or the power amplifier outputs as selected by a switch.
The platform V CC supply can be provided by a wide variety of sources,
including an on-board 9-V battery for low-power or short-duration projects and
unregulated external AC or DC between 5 V and 15 V for other applications.
For TI audio EVMs that require a regulated 3.3-V or 5-V V DD supply, a voltage
regulator EVM can be installed on the platform (U6), or external regulated V DD
power can be applied to a connector on the platform.
Introduction
1-5
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