WM8978
Production Data
w
PD, Rev 4.5, October 2011
6
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously
operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given
under Electrical Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30
C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30
C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30
C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION MIN
MAX
DBVDD, DCVDD, AVDD supply voltages
-0.3V +4.5V
SPKVDD supply voltage
-0.3V +7V
Voltage range digital inputs
DGND -0.3V
DVDD +0.3V
Voltage range analogue inputs
AGND -0.3V
AVDD +0.3V
Operating temperature range, T
A
-40
C +100
C
Storage temperature after soldering
-65
C +150
C
Notes:
1.
Analogue and digital grounds must always be within 0.3V of each other.
2.
All digital and analogue supplies are completely independent from each other.
RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL
TEST
CONDITIONS
MIN TYP MAX UNIT
Digital supply range (Core)
DCVDD
1.71
1
3.6 V
Digital supply range (Buffer)
DBVDD
1.71
2
3.6 V
Analogue core supply range
AVDD
2.5 3.6 V
Analogue output supply range
SPKVDD
2.5 5.5 V
Ground
DGND, AGND,
SPKGND
0
V
Notes:
1.
When using the PLL, DCVDD must not be less than 1.9V.
2.
DBVDD must be greater than or equal to DCVDD.
3.
Analogue supplies have to be
to digital supplies.
4.
In non-boosted mode, SPKVDD should = AVDD, if boosted SPKVDD should be
1.5x AVDD.
Summary of Contents for WM8978
Page 11: ...Production Data WM8978 w PD Rev 4 5 October 2011 11 SPEAKER OUTPUT THD VERSUS POWER...
Page 14: ...WM8978 Production Data w PD Rev 4 5 October 2011 14 AUDIO PATHS OVERVIEW...
Page 55: ...Production Data WM8978 w PD Rev 4 5 October 2011 55 Figure 26 Left Right Output Channel Mixers...
Page 60: ...WM8978 Production Data w PD Rev 4 5 October 2011 60 Figure 29 Speaker Outputs LOUT2 and ROUT2...