Texas Instruments TAS5105EVM, User Manual

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Output stage power supply
RESET
>1 ms
System power supply
System Interfaces
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3.4 Operational Sequence and Indicators
1. Connect the MC016 board to the TAS5105EVM.
2. On the TAS5105 EVM, make sure JP1 and JP3 are in, and JP2 is set to pins 2 and 3.
3. Connect loads to the output of the TAS5105EVM.
4. Connect an SPDIF cable, optical or coaxial, to the MC016 board. Be sure to flip the dipswitch to "RCA"
for coaxial and "OPTO" for optical.
5. Connect the power supply and turn it on.
6. After connecting the power supply and turning it on, the power supply current must read ~50 mA. The
amplifier reset LED must be on. This indicates the board is working and drawing a normal amount of
current.
• The PVDD and 3.3-V LEDs must be on. If not, check the connections to the power supply.
7. Connect the SPDIF cable, either optical or coaxial, to an SPDIF source.
If the preceding conditions are met, the EVM system is ready to accept audio data.
4 System Interfaces
This section describes the TAS5105 EVM board in regards to power supplies and system interfaces.
4.1 Power Supply (PSU) Interface (PVDD and GND)
The TAS5105 EVM module must be powered from a well-regulated external power supply. Good audio
performance requires a stabilized power supply with low ripple voltage and low output impedance.
NOTE: The length of power supply cable must be minimized. Increasing the length of the PSU
cable is equal to increasing the distortion for the amplifier at high output levels and low
frequencies.
Maximum output stage supply voltage depends of the speaker load resistance. For the recommended
maximum supply voltage, see the TAS5105 data sheet (
SLES258 ).
Table 3. Recommended Supply Voltages
Voltage Limitations
Description Current Recommendations
(8-
Ω
Load)
Output stage power supply 8 V – 26 V 5 A
The recommended TAS5105 power-up sequence is shown in Figure 3 . For proper TAS5105 operation,
the RESET signal should be kept low during power up. RESET is pulled low during power up for 200 ms
by the onboard reset generator (U2).
Figure 3. Recommended Power-Up Sequence
8 TAS5105EVM for the TAS5105 Digital Amplifier Power Output Stage SLLU138 – January 2011
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