WM8976 datasheet(20/83 Pages) WOLFSON

номер детали	WM8976

подробное описание детали	Low Power CODEC With Speaker Driver

PDF	83 Pages

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производитель	WOLFSON [Wolfson Microelectronics plc]

домашняя страница	http://www.wolfsonmicro.com

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WM8976

Preliminary Technical Data

PTD Rev 2.0 February 2005

Figure 10 DAC Power Up and Down Sequence (not to scale)

SYMBOL

MIN

TYPICAL

MAX

UNIT

tline_midrail_on

tline_midrail_off

thp_midrail_on

150

thp__midrail_off

tdacint

2/fs

n/fs

DAC Group Delay

29/fs

n/fs

Table 4 Typical DAC Power Up and Down Sequence

Notes:

The lineout charge time, tline_midrail_on, is mainly determined by the VMID pin charge time. This

time is dependent upon the value of VMID decoupling capacitor and VMID pin input resistance

and AVDD power supply rise time. The values above were measured using a 1µF capacitor and

were taken at 10% and 90% points on the charge time curve.

It is not advisable to allow DACDAT data input during initialisation of the DAC. If the DAC data

value is not zero at point of initialisation, then this is likely to cause a pop noise on the analogue

outputs. The same is also true if the DACDAT is removed at a none zero value, and no mute

function has been applied to the signal beforehand.

The lineout discharge time, tline_midrail_off, is dependent upon the value of the lineout coupling

capacitor and the leakage resistance path to ground. The values above were measured using a

1µF capacitor and were taken at 10% and 90% points on the discharge time curve.

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