wm8400 Wolfson Microelectronics plc, wm8400 Datasheet - Page 11

• Manufacturer Part Number: wm8400
• Description: Wolfson Audioplustm Hi-fi Audio Codec And Power Management Unit For Mobile Multimedia
• Manufacturer: Wolfson Microelectronics plc

Notes
w
Pre-Production
Digital core supply range
Digital interfaces supply range
Analogue supplies range
Analogue supplies range
Speaker supply range
Ground
Ambient temperature, T
Junction temperature, T
RECOMMENDED OPERATING CONDITIONS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. Junction temperature is a function of ambient temperature and of the device operating conditions. The ambient
SPEAKER POWER DE-RATING CURVE
Analogue, digital and speaker grounds must always be within 0.3V of each other.
All digital and analogue supplies are completely independent from each other (i.e. not internally connected).
DCVDD must be less than or equal to AVDD.
DCVDD must be less than or equal to MBVDD, I2S1VDD and I2S2VDD.
AVDD must be less than or equal to SPKVDD.
HPVDD must be equal to AVDD
SPKVDD must be high enough to support the peak output voltage when using DCGAIN and ACGAIN functions, to
avoid output waveform clipping. Peak output voltage is AVDD*(DCGAIN+ACGAIN)/2.
The minimum LINE voltage for starting up the WM8400 is also determined by a programmable threshold. See
“Battery Monitoring and Undervoltage Lock-Out (UVLO)”.
LDOnVDD and DCnVDD must be high enough to support the required output voltage from the respective regulator or
converter. See “Electrical Characteristics”.
temperature limits and the junction temperature limits must both be observed. See “Thermal Characteristics”.
PARAMETER
A
J
The speaker driver has been designed to drive a maximum of 1W into 8ohm in class D mode, and
0.5W into 8Ω in class AB mode. These figures are based on operation at room temperature but for
operation at higher temperatures please refer to the power de-rating curve below. Under no
circumstances should the recommended maximum powers or junction temperature of the device be
exceeded.
Figure 1 Speaker Power De-Rating Curve
HBVDD, MBVDD, I2CVDD,
AVDD, FLLVDD, HPVDD,
LDO1VDD, LDO2VDD,
GND, AGND, HPGND,
LDO3VDD, LDO4VDD
I2S1VDD, I2S2VDD
DC1VDD, DC2VDD
SPKVDD
SPKGND
SYMBOL
DCVDD
LINE
1.71
1.71
MIN
2.7
2.5
2.7
2.7
2.7
-40
-40
TYP
0
+125
MAX
+85
3.6
3.6
5.5
5.5
5.5
3.6
5.5
PP, April 2009, Rev 3.0
WM8400
UNIT
ºC
ºC
V
V
V
V
V
V
V
V
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