WM8976 datasheet(55/83 Pages) WOLFSON

部件名	WM8976

功能描述	Low Power CODEC With Speaker Driver

PDF	83 Pages

Scroll/Zoom	100%

制造商	WOLFSON [Wolfson Microelectronics plc]

网页	http://www.wolfsonmicro.com

标志

55 / 83 page

Preliminary Technical Data

WM8976

PTD Rev 2.0 February 2005

A dedicated buffer is available for tying off unused analogue I/O pins as shown in Figure 27. This

buffer can be enabled using the BUFIOEN register bit.

If the SPKBOOST, OUT3BOOST or OUT4BOOST bits are set then the relevant outputs will be tied

to the output of the DC level shift buffer at 1.5xAVDD/2 when disabled.

Figure 27 summarises the tie-off options for the speaker and mono output pins.

Figure 27 Unused Input/Output Pin Tie-off Buffers

L/ROUT2EN/

OUT3/4EN

OUT3BOOST/

OUT4BOOST/

SPKBOOST

VROI

OUTPUT CONFIGURATION

1kΩ tie-off to AVDD/2

30kΩ tie-off to AVDD/2

1kΩ tie-off to 1.5xAVDD/2

30kΩ tie-off to 1.5xAVDD/2

Output enabled (DC level=AVDD/2)

Output enabled (DC level=1.5xAVDD/2)

Table 46 Unused Output Pin Tie-off Options

WM8976 数据表(PDF) 55 Page - Wolfson Microelectronics plc