WM8904ECSSLASHR datasheet(82/188 Pages) WOLFSON

tên linh kiện	WM8904ECS/R

Giải thích chi tiết về linh kiện	Ultra Low Power CODEC for Portable Audio Applications

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WM8904

Pre-Production

PP, Rev 3.3, September 2012

LOW POWER PLAYBACK MODE

The analogue circuits of the WM8904 require a bias current. The default bias configuration is suitable

for typical applications, and does not require any user adjustment.

For lowest power consumption in headphone or line output playback mode, the WM8904 bias settings

must be configured using the register sequence described in Table 48.

Note that the low power playback bias settings are recommended for DAC / Playback modes only;

they are not suitable for ADC / Record Path modes.

ADDRESS

VALUE

04h

0011h

08h

0019h

CCh

0030h

5Bh

0002h

63h

2425h

64h

2B23h

A1h

0002h

65h

00C0h

A1h

0000h

Table 48 Low Power Playback Mode Enable Sequence

The low power mode disable sequence is described in Table 49.

Note that the low power playback bias settings are not suitable for ADC / Record Path modes; the low

power configuration must be disabled for these modes.

ADDRESS

VALUE

04h

0019h

08h

0001h

CCh

0000h

5Bh

0000h

63h

1F25h

64h

2B19h

A1h

0002h

65h

01C0h

A1h

0000h

Table 49 Low Power Playback Mode Disable Sequence

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