WM8983GEFL/RV Wolfson Microelectronics, WM8983GEFL/RV Datasheet - Page 24

• Manufacturer Part Number: WM8983GEFL/RV
• Description: Audio CODECs Mbl Multimedia CODEC w/ 1W Speaker Driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8983GEFL/RV

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C

WM8983
RECOMMENDED POWER UP/DOWN SEQUENCE
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In order to minimise output pop and click noise, it is recommended that the WM8758A device is
powered up and down under control using the following sequences:
Power Up:
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Power Down:
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Note:
Charging time constant is determined by impedance selected by VMIDSEL and the value of
decoupling capacitor connected to VMID pin.
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
= 75kΩ.
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.
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
PD Rev 4.0 November 2006
Production Data
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