Connections
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4
SNAU231 – February 2018
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Copyright © 2018, Texas Instruments Incorporated
LM48580 Evaluation Module
6
Connections
Table 2
lists the connections on the EVM board.
Table 2. Connections
Designator
Function
Notes
J1
Shutdown
Active Low Shutdown. Drive SHDN low to disable the device. Connect SHDN to VDD for
normal operation.
J2
VDD/GND
Power supply and ground reference.
J3
GAIN
Gain select:
GAIN = float: AV = 18 dB
GAIN = GND: AV = 24 dB
GAIN = VDD: AV = 30 dB
J4
OUT±
Positive and negative output terminals.
J5
IN±
Positive and negative input terminals.
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PCB Layout Guidelines
Minimize trace impedance of the power, ground and all output traces for optimum performance. Voltage
loss due to trace resistance between the LM48580 and the load results in decreased output power and
efficiency. Trace resistance between the power supply and ground has the same effect as a poorly
regulated supply: increased ripple and reduced peak output power. Use wide traces for power supply
inputs and amplifier outputs to minimize losses due to trace resistance, as well as route heat away from
the device. Proper grounding improves audio performance, minimizes crosstalk between channels and
prevents switching noise from interfering with the audio signal. Use of power and ground planes is
recommended.
