WM8983GEFL/RV Wolfson Microelectronics, WM8983GEFL/RV Datasheet - Page 27

• 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

Production Data
RECOMMENDED L/ROUT1 ENABLE SEQUENCE
w
Notes:
1.
2.
3.
4.
5.
6.
In order to minimise click noise, it is recommended that the WM8983 headphone outputs are
enabled using the following sequence:
•
•
•
•
•
Notes:
All outputs on WM8983 can also be enabled with a single write to enable bits in registers 2 and 3
without click minimisation. Disabling outputs does not require click minimisation.
The lineout charge time, t
dependent upon the value of VMID decoupling capacitor and VMID pin input resistance and
AVDD power supply rise time. The values above were measured using a 4.7µF capacitor.
It is not advisable to allow DACDAT data input during initialisation of the DAC. If the DAC data
value is not zero at point of initialisation, then this is likely to cause a pop noise on the analogue
outputs. The same is also true if the DACDAT is removed at a non-zero value, and no mute
function has been applied to the signal beforehand.
The lineout discharge time, t
time is dependent upon the value of VMID decoupling capacitor and VMID pin input resistance.
The values above were measured using a 4.7µF capacitor.
The headphone charge time, t
capacitor and VMID pin input resistance and AVDD power supply rise time. The values above
were measured using a 4.7µF VMID decoupling capacitor.
The headphone discharge time, t
capacitor and VMID pin input resistance. The values above were measured using a 4.7µF
VMID decoupling capacitor.
The VMIDSEL and BIASEN bits must be set to enable analogue output midrail voltage and for
normal DAC operation.
Activate dual enable function DELEN = 1 (R42).
Enable L/ROUT1 amplifier core, LOUT1EN = 1, ROUT1EN = 1 (R2).
Enable output FETs, OUT1DEL = 1 (R42).
Disable DELEN = 0.
Reset OUT1DEL = 0.
line_midrail_on,
line_midrail_off,
hp_midrail_on,
hp_midrail_off,
is determined by the VMID pin charge time. This time is
is determined by the VMID pin discharge time. This
is dependent upon the value of VMID decoupling
is dependent upon the value of VMID decoupling
PD Rev 4.0 November 2006
WM8983
27