WM9082 WOLFSON [Wolfson Microelectronics plc], WM9082 Datasheet - Page 12

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

WM9082
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As noted above, the WM9082 Control Codes are only valid when they are transmitted consecutively
for the required number of times. The valid Control Codes can be used to control the operating state
of the WM9082 and also to select different operating modes.
The “Page 2 access” Control Code enables the Page 2 Control Codes for the next control code only;
the Page 1 codes will apply again for any subsequent control code(s).
The state transitions and operating modes are described below.
INITIAL POWER-UP
When a valid CLK signal is first detected on IN1 or IN2, the WM9082 powers up to the “STANDBY”
state. The WM9082 will remain in this state until a “Start-up Event” is detected, or until the CLK signal
is removed.
CONFIGURATION EVENTS
In the STANDBY state, the WM9082 can be configured (if required) using the Control Code
sequences listed in Table 6.
Note that these Control Code sequences are only valid when the WM9082 is in the STANDBY state; it
is not possible to configure the device whilst simultaneously sending audio data.
The following features are configurable in the STANDBY state:
The cut-off frequency of the input path HPF, when enabled, is around 2Hz, assuming a 48kHz audio
sample rate (CLK = 6.144MHz).
The operating mode selections provide different options for SNR vs PSRR optimisation.
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Sample rate (33kHz, 44.1kHz or 48kHz)
Input path High Pass Filter (HPF)
Output slew rate control
Operating Mode (PSRR vs SNR control)
PD, August 2012, Rev 4.1
Production Data
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