WM8974GEFLSLASHV datasheet(42/87 Pages) WOLFSON

номер детали	WM8974GEFL/V

подробное описание детали	Mono CODEC with Speaker Driver

PDF	87 Pages

Scroll/Zoom	100%

производитель	WOLFSON [Wolfson Microelectronics plc]

домашняя страница	http://www.wolfsonmicro.com

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42 / 87 page

WM8974

Production Data

PD Rev 4.2 March 2007

ANALOGUE OUTPUTS

The WM8974 has a single MONO output and two outputs SPKOUTP and SPOUTN for driving a

mono BTL speaker. These analogue output stages are supplied from SPKVDD and are capable of

driving up to 1.5V rms signals (equivalent to 3V rms into a bridge tied speaker) as shown in Figure

20.

Figure 20 Speaker and Mono Analogue Outputs

The Mono and speaker outputs have output driving stages which can be controlled by the register

bits MONOBOOST and SPKBOOST respectively. Each output stage has a selectable gain boost of

1.5x.

When this boost is enabled the output DC level is also level shifted (from AVDD/2 to

1.5xAVDD/2) to prevent the signal from clipping. A dedicated amplifier, as shown in Figure 20, is

used to perform the DC level shift operation. This buffer must be enabled using the BUFDCOPEN

than 1.5xAVDD this boost mode may result in signals clipping. Table 37 summarises the effect of

the SPKBOOST/MONOBOOST control bits.

WM8974GEFL/V датащи(PDF) 42 Page - Wolfson Microelectronics plc