WM8731LSEFL Wolfson Microelectronics, WM8731LSEFL Datasheet - Page 61
WM8731LSEFL
Manufacturer Part Number
WM8731LSEFL
Description
Audio CODECs Stereo Codec with H/P
Manufacturer
Wolfson Microelectronics
Datasheet
1.WM8731LSEFL.pdf
(64 pages)
Specifications of WM8731LSEFL
Number Of Adc Inputs
1
Number Of Dac Outputs
1
Conversion Rate
96 KSPS
Interface Type
Serial (2-Wire, 3-Wire, I2S)
Resolution
18 bit, 20 bit
Operating Supply Voltage
- 0.3 V to + 3.63 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
QFN EP
Minimum Operating Temperature
- 40 C
Number Of Channels
2 ADC/2 DAC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
WM8731LSEFL
Manufacturer:
WOLFSON
Quantity:
7 800
Company:
Part Number:
WM8731LSEFL
Manufacturer:
MAX
Quantity:
5
Part Number:
WM8731LSEFL
Manufacturer:
WM
Quantity:
20 000
Part Number:
WM8731LSEFL/R
Manufacturer:
WOLFSON
Quantity:
20 000
WM8731 / WM8731L
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS
w
To minimise any pop or click noise when the system is powered up or down, the following procedures
are recommended.
POWER UP SEQUENCE
POWER DOWN SEQUENCE
•
•
•
•
•
•
•
Switch on power supplies. By default the WM8731 is in Standby Mode, the DAC is
digitally muted and the Audio Interface and Outputs are all OFF.
Set all required bits in the Power Down register (0Ch) to ‘0’; EXCEPT the OUTPD
bit, this should be set to ‘1’ (Default).
Set required values in all other registers except 12h (Active).
Set the ‘Active’ bit in register 12h.
The last write of the sequence should be setting OUTPD to ‘0’ (active) in register
0Ch, enabling the DAC signal path, free of any significant power-up noise.
Set the OUTPD bit to ‘1’ (power down).
Remove the WM8731 supplies.
PD, Rev 4.8, April 2009
Production Data
61