WM9082 WOLFSON [Wolfson Microelectronics plc], WM9082 Datasheet - Page 16

• Manufacturer Part Number: WM9082
• Description: PDM Input Mono 3W Class D Speaker Driver
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM9082
w
SPEAKER DRIVER
RESETS AND SHUTDOWN
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.
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.
PD, August 2012, Rev 4.1
Production Data
16