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WM8716_08 Datasheet(Hoja de datos) 12 Page - Wolfson Microelectronics plc

No. de Pieza. WM8716_08
Descripción  High Performance 24-bit, 192kHz Stereo DAC
Descarga  26 Pages
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Fabricante  WOLFSON [Wolfson Microelectronics plc]
Página de inicio  http://www.wolfsonmicro.com
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 12 page
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WM8716
Production Data
w
PD, Rev 4.2,August 2008
12
MODES OF OPERATION
Control of the various modes of operation is either by software control over the serial interface, or
by hard-wired pin control. Selection of software or hardware mode is via MODE pin. The following
functions may be controlled either via the serial control interface or by hard wiring of the
appropriate pins.
HARDWARE CONTROL MODES
When the MODE pin is held ‘low’ the following hardware modes of operation are available. In
Hardware differential mode or 8X mode some of these modes/control words are altered or
unavailable.
DE-EMPHASIS CONTROL
MDDM1
PIN 27
MCDMO
PIN 26
DE-EMPHASIS
L
L
Off
L
H
48kHz
H
L
44.1kHz
H
H
32kHz
Table 2 De-Emphasis Control
AUDIO INPUT FORMAT
CSBIIS
PIN 28
CSBIWO
PIN 23
DATA FORMAT
L
L
16 bit normal right justified
L
H
20 bit normal right justified
H
L
16 bit I2S
H
H
24 bit I2S
Table 3 Audio Input Format
SOFT MUTE
MUTEB
PIN 25
FUNCTION
L
Mute On (no output)
Z
Automute
H
Mute Off (normal operation)
Table 4 Soft Mute
A logic low on the MUTEB pin will cause the attenuation to ramp to infinite attenuation at a rate of
128/fs seconds per 0.5dB step. Setting MUTEB high will cause the attenuation to ramp back to its
previous value.
Leaving MUTEB undriven allows operation of the automute circuit in both hardware and software
modes. On receiving 1024 consecutive zero value audio samples, the analogue stage output mute is
asserted. This may be overdriven from the MUTEB pin to disable the automute function, or output as
a weak (10kohm) output signal.




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