WM8590GEDSSLASHV datasheet(26/51 Pages) WOLFSON

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WM8590

Pre-Production

PP Rev 3.3 September 2005

DAC OVERSAMPLING RATE SELECT

Control bit DACOSR allows the user to select the DAC internal signal processing oversampling rate.

Operation is described in Table 5 and Table 6.

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

0001010

DAC Oversampling Rate

DACOSR

DAC Oversampling Rate Select

0: 128x oversampling

1: 64x oversampling

MUTE MODES

Setting MUTE for the DAC will apply a ‘soft’ mute to the input of the digital filters of the channel

muted.

BIT

LABEL

DEFAULT

DESCRIPTION

R9 (09h)

0001001

DAC Mute

DMUTE

DAC Soft Mute Select

0 : Normal Operation

1: Soft mute enabled

Figure 20 Application and Release of Soft Mute

Figure 20 shows the application and release of DMUTE whilst a full amplitude sinusoid is being

played at 48kHz sampling rate. When DMUTE (lower trace) is asserted, the output (upper trace)

begins to decay exponentially from the DC level of the last input sample. The output will decay

towards VMID with a time constant of approximately 64 input samples. If DMUTE is applied to both

channels for 1024 or more input samples the DAC will be muted if IZD is set. When DMUTE is de-

asserted, the output will restart immediately from the current input sample.

Note that all other means of muting the DAC: setting the PL[3:0] bits to 0, setting the PDWN bit or

setting attenuation to 0 will cause much more abrupt muting of the output.

-2.5

-2

-1.5

-1

-0.5

0.5

1.5

0.001

0.002

0.003

0.004

0.005

0.006

Time(s)

WM8590GEDS/V 数据表(PDF) 26 Page - Wolfson Microelectronics plc

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