WM8955 Ver la hoja de datos (PDF) - Wolfson Microelectronics plc
Número de pieza
componentes Descripción
Fabricante
WM8955 Datasheet PDF : 43 Pages
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WM8955L
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POWER CONSUMPTION
The power consumption of the WM8955L depends on the following factors.
• Supply voltages: Reducing the supply voltages also reduces supply currents, 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
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 0 0 0 Clocks stopped 3.3
3.3
3.3
3.3
01 0 0 0
2.5
2.5
2.5
2.5
00 0 0 0
1.8
1.5
1.5
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 0 0 0
2.5
2.5
2.5
2.5
00 0 0 0
1.8
1.5
1.5
1.8
Playback to Line-out
01 1 1 1 0 0 1 1 0 0 0 11 0 0 0
3.3
3.3
3.3
3.3
01 0 0 0
2.5
2.5
2.5
2.5
00 0 0 0
1.8
1.5
1.5
1.8
Playback to Line-out
01 1 1 1 1 1 0 0 0 0 1 11 0 0 0
3.3
3.3
3.3
3.3
(64x oversampling mode)
01 0 0 0
2.5
2.5
2.5
2.5
00 0 0 0
1.8
1.5
1.5
1.8
Playback
01 1 1 1 1 1 0 0 0 0 0 11 0 0 0
3.3
3.3
3.3
3.3
to 16 Ohm headphone
01 0 0 0
2.5
2.5
2.5
2.5
using caps on HPOUTL/R
00 0 0 0
1.8
1.5
1.5
1.8
Playback
01 1 1 1 1 1 0 0 0 1 0 11 0 0 0 R24, OUT3SW=00 3.3
3.3
3.3
3.3
to 16 Ohm headphone
01 0 0 0
2.5
2.5
2.5
2.5
capless mode using OUT3
00 0 0 0
1.8
1.5
1.5
1.8
Playback
01 1 1 1 0 0 1 1 0 0 0 11 0 0 0 R24, ROUT2INV=1 3.3
3.3
3.3
3.3
to 8 Ohm BTL speaker
01 0 0 0
2.5
2.5
2.5
2.5
00 0 0 0
1.8
1.5
1.5
1.8
Headphone Amp
01 1 0 0 1 1 0 0 0 0 0 11 0 0 0
3.3
3.3
3.3
3.3
line-in to 16 Ohm h/phone
01 0 0 0
2.5
2.5
2.5
2.5
00 0 0 0
1.8
1.5
1.5
1.8
Speaker Amp
01 1 0 0 0 0 1 1 0 0 0 11 0 0 0 R24, ROUT2INV=1 3.3
3.3
3.3
3.3
line-in to 8 Ohm speaker
01 0 0 0
2.5
2.5
2.5
2.5
00 0 0 0
1.8
1.5
1.5
1.8
Phone Call
01 1 0 0 1 1 0 0 1 1 0 11 1 0 0
3.3
3.3
3.3
3.3
diff. mono line-in to h/phone,
01 1 0 0
2.5
2.5
2.5
2.5
diff. mono line-out to TX
00 1 0 0
1.8
1.5
1.5
1.8
PLL only
00 0 0 0 0 0 0 0 0 0 0 11 0 1 0
3.3
3.3
3.3
3.3
01 0 1 0
2.5
2.5
2.5
2.5
00 0 1 0
1.8
1.5
1.5
1.8
PLL and CLKOUT
00 0 0 0 0 0 0 0 0 0 0 11 0 1 1
3.3
3.3
3.3
3.3
01 0 1 1
2.5
2.5
2.5
2.5
00 0 1 1
1.8
1.5
1.5
1.8
Maximum Power
01 1 1 1 1 1 1 1 1 1 0 11 1 1 1 R24, ROUT2INV=1 3.3
3.3
3.3
3.3
everything ON
01 1 1 1
2.5
2.5
2.5
2.5
00 1 1 1
1.8
1.5
1.5
1.8
(mW)
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.
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Product Preview Rev 0.4 May 2003
10
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