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WM8983GEFL/V Datasheet(PDF) 24 Page - Wolfson Microelectronics plc

Part # WM8983GEFL/V
Description  Mobile Multimedia CODEC with 1W Speaker Driver
PDF  124 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8983GEFL/V Datasheet(HTML) 24 Page - Wolfson Microelectronics plc

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WM8983
Production Data
w
PD, Rev 4.3, May 2010
24
RECOMMENDED POWER UP/DOWN SEQUENCE
In order to minimise output pop and click noise, it is recommended that the WM8983 device is
powered up and down under control using the following sequences:
Power Up:
•
Turn on external power supplies. Wait for supply voltage to settle.
•
Set low bias mode, BIASCUT = 1.
•
Mute all Outputs and set PGAs to minimum gain, R52 to R57 = 0x140h.
•
Enable VMID independent current bias, POBCTRL = 1, DELEN = 1.
•
Enable required outputs, DACs and mixers.
•
Enable analogue bias, BIASEN, and VMID with required charge time e.g. VMIDSEL=01
= 100kΩ.
•
Setup digital interface, input amplifiers, PLL, ADCs and DACs for desired operation.
•
Unmute L/ROUT1 and set desired volume, e.g. for 0dB R52 and R53 = 0x139h.
•
Unmute L/ROUT2 and set desired volume, e.g. for 0dB R54 and R55 = 0x139h.
•
Disable VMID independent current bias, POBCTRL = 0, DELEN = 0.
Power Down:
•
Disable Thermal shutdown
•
Disable VMIDSEL=00 and BIASEN=0
•
Wait for VMID to discharge
•
Power off registers R1, R2, R3 = 0x000h
•
Remove external power supplies
Note:
Charging time constant is determined by impedance selected by VMIDSEL and the value of
decoupling capacitor connected to VMID pin.



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