Texas Instruments TPA3125D2 EVM, Руководство пользователя, Страница: 3 / 11

1.2 EVM Specifications
2 Quick Start for Stand-alone Operation
2.1 Power Supply
2.2 Evaluation Module Preparations
2.2.1 Inputs and Outputs
2.2.2 Control Inputs
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Quick Start for Stand-alone Operation
Table 1. TPA3125D2 EVM Specifications
Value Units
VCC Supply voltage range 10 to 26 V
ICC Supply current 3 A
Continuous output power per channel
P
O
10 W
8
Ω
, VCC = 24V, THD+N=10%
R
L
Minimum load impedance 4
Ω
Use these procedures to operate the TPA3125D2 EVM in a stand-alone configuration, or when connecting
it into existing circuits or equipment. Connections to the EVM module can be made by inserting stripped
wire for the power supplies. Two pin male headers are provided for the speaker connections and the
inputs accept standard RCA plugs.
1. Ensure that all external power sources are set to OFF.
2. Connect an external regulated power supply adjusted from 10 V to 26 V to the module VCC and GND
terminal block ( J1 ), taking care to observe marked polarity.
1. Connect the left and right speakers across LOUT and ROUT respectively.
2. Install both gain jumpers GAIN0 and GAIN1. This sets the amplifier gain to the lowest level, 20 dB.
•
SHUTDOWN (S1) —terminal is active LOW. A LOW on the device terminal (less than 0.8 V) shuts
down the amplifier; a HIGH (greater than 2 V) on the device terminal places the amplifier in the active
state. Pressing and holding the switch
S1 places the amplifier in the SHUTDOWN state. Releasing the
S1 switch returns the amplifier to the active state. This terminal is VCC compliant.
•
MUTE (S2) —terminal is active HIGH. A HIGH (greater than 2 V) on this terminal immediately
terminates audio playback through the speakers; a LOW (less than 0.8 V) enables the device. The
outputs remain switching with a 50% duty cycle. The EVM
S2 switch controls the state of the MUTE
terminal. Pressing and holding the S2 switch places the amplifier in the MUTE state. Releasing the S2
switch returns the amplifier to the active state. This terminal is VCC compliant.
•
GAIN0/GAIN1 —Together, these terminals determine the gain of the amplifier (see Table 2 ). Installing
a jumper in GAIN0 or GAIN1 sets the respective terminal to GND. Removing the jumper sets the
respective terminals to VCC. Removing jumpers increases the gain while installing jumpers
decreases the gain. Logic levels are TTL compatible. These terminals are VCC compliant.
SLOU250 – January 2009 TPA3125D2 EVM 3
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