WM9082 WOLFSON [Wolfson Microelectronics plc], WM9082 Datasheet - Page 13

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

Production Data
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The Control Code sequences are listed in Table 6.
Table 6 WM9082 Configuration Events
If none of these Control Code sequences is received, then the WM9082 is configured for the following
default operating conditions:
Note that the default operating conditions are only restored on power-up or following a period when
the CLK input is stopped.
START-UP EVENTS
The WM9082 Class D output is enabled whenever PDM audio data is detected at the input pins, or
when a valid Start-Up Control Code is detected. The WM9082 Start-Up is selected under any of the
conditions described in Table 7. Each of these conditions results in a transition to the “ON” state.
Note that, if SPKVDD > 4.3V, then it is recommended to start up the WM9082 using Code 10; this
ensures that the device is optimally configured for the higher SPKVDD level.
Note that, when the start-up transition occurs as a result of PDM audio data, then the WM9082 will be
enabled in whichever mode had previously been selected (if any). In the case where the “ON” state
has not previously been selected, then the default (SPKVDD = 3.6V) mode is chosen.
Select 32kHz sample rate
Disable the input path HPF
Select 10ns output slew rate
Select 20ns output slew rate
Select 40ns output slew rate
Select ‘Best PSRR’ mode
Select ‘Best SNR’ mode
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DESCRIPTION
Sample rate is 44.1kHz or 48kHz
Input path High Pass Filter (HPF) enabled
Output slew rate is 10ns
Default PSRR and SNR (see “Electrical Characteristics”)
CONTROL CODE
32 x Code 10
32 x Code 10
32 x Code 10
32 x Code 4
32 x Code 5
32 x Code 6
32 x Code 9
32 x Code 3
32 x Code 3
32 x Code 6
32 x Code 9
32 x Code 6
32 x Code 6
32 x Code 6
32 x Code 6
32 x Code 3
PD, August 2012, Rev 4.1
WM9082
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