WM1811A datasheet(55/328 Pages) WOLFSON

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Production Data

WM1811A

PD, November 2013, Rev 4.1

DIGITAL PULL-UP AND PULL-DOWN

The WM1811A provides integrated pull-up and pull-down resistors on the DMICDAT pin. This

provides a flexible capability for interfacing with other devices. Each of the pull-up and pull-down

resistors can be configured independently using the register bits described in Table 12.

Note that, if the DMICDAT digital microphone channels are disabled, or if DMICDAT1_PU and

DMICDAT1_PD are both set, then the pull-up and pull-down will be disabled.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1824

(0720h)

Pull Control

(1)

DMICDAT1_PU

DMICDAT Pull-Up enable

0 = Disabled

1 = Enabled

DMICDAT1_PD

DMICDAT Pull-Down enable

0 = Disabled

1 = Enabled

Table 12 Digital Pull-Up and Pull-Down Control

ANALOGUE TO DIGITAL CONVERTER (ADC)

The WM1811A uses stereo 24-bit sigma-delta ADCs. The use of multi-bit feedback and high

oversampling rates reduces the effects of jitter and high frequency noise. The oversample rate can be

adjusted, if required, to reduce power consumption - see “Clocking and Sample Rates” for details. The

ADC full scale input level is proportional to AVDD1 - see “Electrical Characteristics”. Any input signal

greater than full scale may overload the ADC and cause distortion.

The ADCs are enabled by the ADCL_ENA and ADCR_ENA register bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R4 (0004h)

Power

Management (4)

ADCL_ENA

Left ADC Enable

0 = Disabled

1 = Enabled

ADCR_ENA

Right ADC Enable

0 = Disabled

1 = Enabled

Table 13 ADC Enable Control

The outputs of the ADCs can be routed to the AIF1 digital audio interface output paths.

Digital volume control of the ADC outputs in the AIF1 signal paths is provided using the registers

described in the “Digital Volume and Filter Control” section.

The outputs of the ADCs can also be routed, in a limited number of configurations, to the digital mixing

output bus, via the digital sidetone signal paths. See “Digital Mixing” for further details.

Digital volume control of the ADC outputs in the digital sidetone signal paths is provided using the

registers described in the “Digital Mixing” section.

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