WM8741GEDS/V Wolfson Microelectronics, WM8741GEDS/V Datasheet - Page 28

• Manufacturer Part Number: WM8741GEDS/V
• Description: Audio D/A Converter ICs Stereo DAC, High End
• Manufacturer: Wolfson Microelectronics

Specifications of WM8741GEDS/V

• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8741
SOFTWARE CONTROL MODE
w
Figure 23 Bi-phase DSD Mode Timing Diagram
Software control allows access to all features of the WM8741. Selection of control mode is achieved
by configuring the state of MODE/LRSEL (pin 24):
Table 14 Control Mode Configuration
DSD AND PCM MODE SWITCHING
The audio interface mode can be switched between DSD and PCM by writing MODESEL[1:0] in R7.
It is recommended that the chip is forced into a MUTE state before dynamically switching modes.
Table 15 PCM/DSD Software Mode Selection
PCM DIGITAL AUDIO INTERFACE CONTROL REGISTERS
The PCM digital audio input format is configured by register bits FMT [1:0] and IWL[1:0]:
Table 16 Interface Format Controls
Note:
1.
REGISTER ADDRESS
REGISTER ADDRESS
In all modes, the data is signed 2's complement. The WM8741 digital filters always
input 24-bit data. If the interface is programmed into 32 bits, dither is applied according
to Table 37 before truncation to the internal wordlength.
Mode Control 1
Format Control
PIN
24
07h
05h
R7
R5
MODE/
LRSEL
NAME
[1:0]
BIT
BIT
1:0
3:2
0 = Hardware control mode
1 = 3-wire serial control mode
Z = 2-wire serial control mode
MODESEL
FMT[1:0]
IWL[1:0]
LABEL
LABEL
DESCRIPTION
DEFAULT
DEFAULT
10
10
00
Audio interface input word length
select
00 = 16-bit
01 = 20-bit
10 = 24-bit
11 = 32-bit
Audio interface input format select
00 = Right justified
01 = Left justified
10 = I
11 = DSP
DSD/PCM mode select :
00 = PCM mode
01 = Direct DSD Operation
10 = DSD plus mode
11 = Unused
2
S
DESCRIPTION
DESCRIPTION
PD, Rev 4.2, October 2009
Production Data
28