Texas Instruments Connecting the TAS5727EVM to MC57xxPSIA, Recommended Power Supplies

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2.1.1Connecting the TAS5727EVM to MC57xxPSIA

On the right side of the MC57xxPSIA is a terminal block and another on the left of the TAS5727EVM (labeled J1). Carefully place the MC57xxPSIA block above the TAS5727EVM block and gently push down.

Figure 4. Connecting TAS5727EVM to MC57xxPSIA

2.1.2PSU Interface

The TAS5727EVM is powered by two power supplies connected to the MC57xxPSIA controller board: a 5V power supply (VIN), and a 8V-to-26V (PVDD) power supply. The 3.3V level is generated from the 5V supply by an on-board voltage regulator.

NOTE: The power-supply cable length must be minimized. Increasing the length of the PSU cable increases the distortion of the amplifier at high output levels and low frequencies.

The maximum output-stage supply voltage depends on the speaker load resistance. See the recommended maximum supply voltage in the TAS5727EVM data sheet.

Table 1. Recommended Power Supplies

Description	Voltage Limitations (8-ΩLoad)	Current Recommendations
System power supply	5V	1A
Output power stage supply	8–26V	4A(1)

(1)The rated current corresponds to two channels, full scale.

2.1.3Loudspeaker Connectors

CAUTION

All speaker outputs are biased at Vcc/2 and must not be connected to ground (e.g., through an oscilloscope ground).

Loudspeaker connections vary by device setup. When connecting a speaker in BTL mode, connect the speaker’s two terminals (A and B or C and D) across two outputs on the TAS5727EVM.

Speakers or loads can be connected to the outputs A-D with clip leads, or cables can be made with female connectors (JST VHR-2N) that can mate to male connectors on the EVM board.

4	TAS5727 25W Digital Input Amplifier—with EQ and 2-Band DRC	SLOU299 –December 2010
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