WM8962B datasheet(138/295 Pages) WOLFSON

138 / 295 page

WM8962

138

Rev 4.3

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R71 (47h)

Analogue

HP 2

2:0

HP_BIAS_BOOST

[2:0]

011

Headphone Driver Boost Bias

000 = x 2.0

001 = Reserved

010 = Reserved

011 = x 1.0 (default)

100 to 111 = Reserved

Table 87 Output Signal Path Bias Control Settings

It is recommended that the output signal path bias control settings are selected only from the

supported combinations listed in Table 88.

Note that, for the specified performance in ‘High Performance’ mode, the headphone output

secondary PGAs must be set to -

7dB attenuation. See “Headphone Output Paths” for details of the

associated registers.

DESCRIPTION

DAC_HP

HP_PGAS_BIAS

HP_BIAS_BOOST

HP1L_VOL,

HP1R_VOL

Low Power headphone playback mode

011

XXX

High Performance headphone playback mode

000

Table 88 Recommended Bias Control Settings (Output Signal Path)

Note that power consumption in the WM8962 can be optimised in real time using the adaptive Charge

Pump that provides the supply rails to the headphone driver. The Dynamic control mode of the

Charge Pump provides lowest power consumption, and may be selected in Low Power or High

Performance headphone playback modes.

Note that there are some operating conditions in which the Dynamic control mode should not be

selected

; these are described in the “Charge Pump” section.

DIGITAL AUDIO INTERFACE

The digital audio interface is used for inputting DAC data to the WM8962 and outputting ADC data

from it. The digital audio interface uses four pins:



ADCDAT: ADC data output



DACDAT: DAC data input



LRCLK: Left/Right data alignment clock



BCLK: Bit clock, for synchronisation

The clock signals BCLK and LRCLK can be outputs when the WM8962 operates as a master, or

inputs when it is a slave (see

“Master and Slave Mode Operation”, below).

Four different audio data formats are supported:



Left justified



Right justified



I2S



DSP mode

All four of these modes are MSB first. They are described in

“Audio Data Formats (Normal Mode)”

below. Refer to the “Signal Timing Requirements” section for timing information.

Time Division Multiplexing (TDM) is available in all four data format modes. The WM8962 can be

programmed to send and receive data in one of two time slots.

WM8962B Datasheet(PDF) 138 Page - Wolfson Microelectronics plc

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