WM8959 datasheet(68/155 Pages) WOLFSON

68 / 155 page

WM8959

Pre-Production

PP, May 2008, Rev 3.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R35 (23h)

CDMODE

Speaker Class D Mode Enable

0 = Class D mode

1 = Class AB mode

5:3

DCGAIN

[2:0]

000b

(1.0x)

DC Speaker Boost

000 = 1.00x boost (+0dB)

001 = 1.27x boost (+2.1dB)

010 = 1.40x boost (+2.9dB)

011 = 1.52x boost (+3.6dB)

100 = 1.67x boost (+4.5dB)

101 = 1.80x boost (+5.1dB)

110 to 111 = Reserved

R37 (25h)

2:0

ACGAIN

[2:0]

000b

(1.0x)

AC Speaker Boost

000 = 1.00x boost (+0dB)

001 = 1.27x boost (+2.1dB)

010 = 1.40x boost (+2.9dB)

011 = 1.52x boost (+3.6dB)

100 = 1.67x boost (+4.5dB)

101 = 1.80x boost (+5.1dB)

110 to 111 = Reserved

Table 33 Speaker Boost Control

HEADPHONE OUTPUT CONFIGURATIONS

The headphone outputs LOUT, ROUT, OUT3 and OUT4 are each driven by different output mixers

as described below.

The LOUT and ROUT pins output the LOMIX and ROMIX outputs respectively.

OUT3 is the output of mixer OUT3MIX, whose inputs are:

•

LIN4/RXN

•

LOMIX output via volume control LOPGA

OUT4 is the output of mixer OUT4MIX, whose inputs are:

•

RIN4/RXP

•

ROMIX output via volume control ROPGA

Full volume control is available on LOUT and ROUT. 0dB and -6dB attenuation is available on OUT3

and OUT4, with full volume control available using LOPGA and ROPGA for the LOMIX and ROMIX

signals.

The outputs LOUT, ROUT, OUT3 and OUT4 are capable of driving 40mW into 16

Ω loads such as

stereo headsets, headphones, and/or a handset ear speaker. AC-coupled, capless mode and fully

differential headphone drive modes are available.

AC-coupled output is possible on each of LOUT, ROUT, OUT3 and OUT4 simultaneously.

Capless headphone output is possible on LOUT and ROUT by using either OUT3 or OUT4 as the

common return path. (This is achieved by muting OUT3 or OUT4 as required.)

If RXP and RXN are a mono differential input (e.g. a connection to an external voice CODEC), then

OUT3 and OUT4 may be used as a differential output capable of driving a handset ear speaker. The

signal paths from RXP to OUT4 and from RXN to OUT3 are direct, and do not pass through any

additional amplifiers. This reduces standby and active power consumption and improves signal

quality.

WM8959 Datasheet(PDF) 68 Page - Wolfson Microelectronics plc

WM8959 Datasheet(HTML) 68 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL