WM8714

Production Data

w

PD Rev 4.0 November 2004

12

HARDWARE CONTROL MODES

The WM8714 is hardware programmable providing the user with options to select input audio data

format, de-emphasis and mute.

MUTE OPERATION

Pin 10 (MUTE) controls selection of MUTE directly, and can be used to enable and disable the

mute.

MUTE PIN

DESCRIPTION

0

Normal Operation, MUTE off

1

Mute DAC channels

Table 2 Mute Control

Figure 5 Application and Release of MUTE

The MUTE pin is an input to select mute or not mute. MUTE is active high; taking the pin high

causes the filters to soft mute, ramping down the audio signal over a few milliseconds. Taking

MUTE low again allows data into the filter. Refer to figure 5.

INPUT AUDIO FORMAT SELECTION

FORMAT (pin 13) controls the data input format.

FORMAT

INPUT DATA MODE

0

16 right justified

1

16 - 24-bit I

Table 3 Input Audio Format Selection

Notes:

1.

In 16-24 bit I

for a minimum of 24 BCKINs and low for a minimum of 24 BCKINs, unless Note 2.

2.

If exactly 16 BCKIN cycles occur in both the low and high period of LRCIN the WM8714 will

assume the data is 16-bit and accept the data accordingly.

-2.5

-2

-1.5

-1

-0.5

0

0.5

1

1.5

0

0.001

0.002

0.003

0.004

0.005

0.006

Time(s)