WM8980CGEFL/RV WOLFSON [Wolfson Microelectronics plc], WM8980CGEFL/RV Datasheet - Page 91

• Manufacturer Part Number: WM8980CGEFL/RV
• Description: Stereo CODEC with Speaker Driver and Video Buffer
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Pre-Production
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Table 67 Typical POR Operation (typical values, not tested)
DAC Group Delay
Notes:
1.
2.
3.
4.
5.
6.
t
t
t
t
SYMBOL
hp__midrail_off
line_midrail_on
line_midrail_off
hp_midrail_on
The lineout charge time, t
is 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
capacitor and the leakage resistance path to ground. The values above were measured using a
10μF output 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
coupling capacitor and the leakage resistance path to ground. The values above were
measured using a 100μF capacitor.
The vmidsel and biasen bits must be set to enable analogue output midrail voltage and for
normal dac operation.
t
dacint
MIN
TYPICAL
line_midrail_on,
29/fs
500
500
2/fs
1
6
line_midrail_off,
hp_midrail_on,
hp_midrail_off,
is mainly determined by the VMID pin charge time. This time
MAX
is dependent upon the value of the lineout coupling
is dependent upon the value of VMID decoupling
is dependent upon the value of the headphone
UNIT
n/fs
n/fs
ms
ms
s
s
PP, Rev 3.8, May 2012
WM8980
91