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Operation
Table 4. Gain Settings
GAIN1 (J6)
(1)
GAIN0 (J5)
(1)
AMPLIFIER GAIN (dB)
ON
ON
12
ON
OFF
18
OFF
ON
23.6
OFF
OFF
Reserved
(1)
OFF = Jumper removed; ON = Jumper installed
Control Outputs
1. ZERO: This pin is a TTL output for monitoring the state of the digital input. If the data for L-channel
and R-channel remains at a 0 level for 1024 sampling periods (or LRCK clock periods), ZERO is set to
a logic 1 state. If an input is present, the ZERO output is set to a logic 0. If desired, the output of this
terminal can be inverted with an external transistor and used to place the amplifier in a SHUTDOWN
state when no input is detected (see the operation of the SHUTDOWN terminal in the Control Input
section). A test point, TP1, is provided to monitor this output.
Power Up
1. Verify correct voltage and input polarity and turn the external power supplies on. The supplies should
be sequenced such that the 5-V supply comes up first before the 8-V – 18-V supply is turned on.
The EVM should begin operation.
2. Adjust the control inputs to the desired settings.
3. If no sound is audible, check the state of the MUTE (S3) switch.
4. If the sound is distorted, check the status of the FORMAT (S2) switch to ensure the format selected
matches the incoming digital data stream selected by SW001–SW003 on the DEM-DAI/DAC platform.
5. Adjust the amplifier gain by installing/removing the gain jumpers, J5 and J6.
6. Switch between the LEFT and RIGHT digital data by moving the left side of switch S2 between the two
settings.
TPA3200D1 Audio Power Amplifier Evaluation Module
8
SLOU173B – June 2005 – Revised July 2005
