WM8955L
Product Preview
POWER CONSUMPTION
The power consumption of the WM8955L depends on the following factors.
•
Supplyvoltages: Reducing the supplyvoltages also reduces supplycurrents, and therefore results in significant power
savings.
•
Operating mode: Power consumption is lower in mono modes than in stereo, as one DAC is switched OFF. Unused
analogue outputs should be switched off.
Control Register
R25
R26 (1Ah)
R24 R23 R38 R43
Other settings
AVDD
DCVDD
DBVDD
HPVDD
Tot. Power
(mW)
Bit
V
I (mA)
V
I (mA)
V
I (mA)
V
I (mA)
OFF
00
0
0
0
0
0
0
0
0
0
0
11
01
00
0
0
0
0
0
0
0
0
0
Clocks stopped
3.3
2.5
1.8
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.8
Low-power standby(LPS)
10
1
0
0
0
0
0
0
0
0
0
11
0
0
0
3.3
3.3
3.3
3.3
using 500 KOhm VMID string
01
00
11
01
00
11
01
00
11
01
00
11
01
00
11
01
00
11
01
00
11
01
00
11
01
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
Playback to Line-out
01
1
1
1
1
1
1
0
0
0
1
1
1
1
1
0
0
0
0
0
1
0
1
1
1
0
1
0
1
0
1
1
0
0
0
1
0
1
0
1
0
0
0
1
0
1
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
1
0
1
0
0
0
0
0
0
Playback to Line-out
(64x oversampling mode)
01
01
01
01
01
01
01
0
1
1
1
1
1
1
1
Playback
1
to 16 Ohm headphone
using caps on HPOUTL/R
Playback
to 16 Ohm headphone
capless mode using OUT3
Playback
1
R24, OUT3SW=00 3.3
2.5
1.8
0
R24, ROUT2INV=1 3.3
to 8 Ohm BTL speaker
2.5
1.8
3.3
2.5
Headphone Amp
line-in to 16 Ohm h/phone
1
1.8
Speaker Amp
line-in to 8 Ohm speaker
0
R24, ROUT2INV=1 3.3
2.5
1.8
3.3
2.5
1.8
Phone Call
diff. mono line-in to h/phone,
diff. mono line-out to TX
1
PLL only00
0
0
0
0
0
0
0
0
11
0
0
1
0
3.3
3.3
3.3
3.3
01
00
11
01
00
11
01
00
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
2.5
1.8
3.3
2.5
1.8
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
2.5
1.5
3.3
2.5
1.5
3.3
2.5
1.5
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
PLL and CLKOUT
00
01
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
Maximum Power
everything ON
1
R24, ROUT2INV=1 3.3
2.5
1.8
Table 1 Supply Current Consumption (data to follow)
Notes:
1. TA = +25oC, Slave Mode, fs = 48kHz, MCLK = 12.288 MHz (256fs), 24-bit data
2. All figures are quiescent, with no signal.
3. The power dissipated in the headphone itself is not included in the above table.
Product Preview Rev 0.4 May2003
10
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
