WM9082

Production Data

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PD, August 2012, Rev 4.1

16

SPEAKER DRIVER

The speaker outputs SPKOUTP and SPKOUTN operate in a BTL configuration. These pins provide a

differential output for direct connection to the loudspeaker. In a typical application, no other external

components are required for the loudspeaker connection.

The sigma-delta architecture of the Class D driver is more linear and power efficient than traditional

PWM implementations, resulting in reduced power consumption and improved EMI characteristics.

The speaker driver is disabled during start-up and following receipt of selected Control Codes which

can be used to configure the WM9082. The driver is automatically re-enabled on receipt of any audio

data.

RESETS AND SHUTDOWN

A power on reset circuit ensures correct start-up and shut-down when the DVDD supply rail is

enabled or disabled.

The WM9082 is held in the “OFF” state when there is no CLK signal detected on the IN1 or IN2 pins;

the Shutdown current in the “OFF” state is noted in the “Electrical Characteristics” section.

Short circuit and thermal protection is also provided. In the event of an output short-circuit or an over-

temperature condition, the WM9082 will protect itself by disabling the Class D speaker driver. The

WM9082 will automatically recover and continue normal operation when the fault condition is cleared.