WM8731 datasheet(28/56 Pages) WOLFSON

부품명	WM8731

상세설명	Portable Internet Audion CODEC with Headphone Driver and Programmable Sample Rates

PDF	56 Pages

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제조업체	WOLFSON [Wolfson Microelectronics plc]

홈페이지	http://www.wolfsonmicro.com

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WM8731

Advanced Information

WOLFSON MICROELECTRONICS LTD

AI Rev 2.0 February 2001

The recommended external components required to complete the application are shown in Figure 21.

AGND

HPOUT

Figure 21 Headphone Output Application Drawing

Recommended values are C1 = 220uF (10V electrolytic), R1 = 47k

C1 forms a DC blocking capacitor to isolate the dc of the HPOUT from the headphones. R1 form a

pull down resistor to discharge C1 to prevent the voltage at the connection to the headphones from

rising to a level that may damage the headphones.

BYPASS MODE

The WM8731 includes a bypass mode whereby analogue line inputs are routed directly to the

analogue line outputs and headphone outputs. The scheme for this is in Figure 22.

12.5K

VMID

LINEIN

VMID

HPOUT

VMID

FROM

LINE

INPUTS

LINEOUT

FROM

DAC

BYPASS (ON)

DACSEL (OFF)

SIDETONE (OFF)

Figure 22 Signal Routing in Bypass Mode

WM8731 데이터시트(PDF) 28 Page - Wolfson Microelectronics plc