TAS5613

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SLAS676 – NOVEMBER 2009

The VREG pin is not recommended to be used as a voltage source for external circuitry.

OSCILLATOR

The oscillator frequency can be trimmed by external control of the FREQ_ADJ pin.

To reduce interference problems while using radio receiver tuned within the AM band, the switching frequency

can be changed from nominal to lower values. These values should be chosen such that the nominal and the

lower value switching frequencies together results in the fewest cases of interference throughout the AM band.

can be selected by the value of the FREQ_ADJ resistor connected to AGND in master mode.

For slave mode operation, turn of the oscillator by pulling the FREQ_ADJ pin to VREG. This configures the

OSC_I/O pins as inputs and needs to be slaved from an external differential clock.

PRINTED CIRCUIT BOARD RECOMMENDATION

Use an unbroken ground plane to have good low impedance and inductance return path to the power supply for

power and audio signals. PCB layout, audio performance and EMI are linked closely together. The circuit

contains high fast switching currents; therefore, care must be taken to prevent damaging voltage spikes. Routing

the audio input should be kept short and together with the accompanied audio source ground. A local ground

area underneath the device is important to keep solid to minimize ground bounce.

Netlist for this printed circuit board is generated from the schematic in Figure 12.

Copyright © 2009, Texas Instruments Incorporated

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