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PDF WM8955LEFL Data sheet ( Hoja de datos )
| Número de pieza | WM8955LEFL | |
| Descripción | STEREO DAC FOR PORTABLE AUDIO APPLICATIONS | |
| Fabricantes | Wolfson Microelectronics plc | |
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WM8955L
Stereo DAC for Portable Audio Applications
DESCRIPTION
FEATURES
The WM8955L is a low power, high quality stereo DAC with
integrated headphone and loudspeaker amplifiers, designed to
reduce external component requirements in portable digital
audio applications.
The on-chip headphone amplifiers can deliver 40mW into a 16Ω
load. Advanced on-chip digital signal processing performs bass
and treble tone control.
The WM8955L can operate as a master or a slave, and
includes an on-chip PLL. It can use most master clock
frequencies commonly found in portable systems, including
USB, GSM, CDMA or PDC clocks, or standard 256fs clock
rates. Different audio sample rates such as 48kHz, 44.1kHz,
8kHz and many others are supported.
The WM8955L operates on supply voltages from 1.8V up to
3.6V, although the digital core can operate on a separate supply
down to 1.42V, saving power. Different sections of the chip can
also be powered down under software control.
The WM8955L is supplied in a very small and thin 5x5mm QFN
package, ideal for use in hand-held and portable systems.
BLOCK DIAGRAM
• DAC SNR 98dB, THD -86dB (‘A’ weighted @ 48kHz, 3.3V)
• On-chip 400mW BTL Speaker Driver (mono)
• On-chip Headphone Driver
- 40mW output power on 16Ω / 3.3V
- SNR 96dB, THD –79dB at 20mW with 16Ω load
• Stereo and Mono Line-in mix into DAC output
• Separately Mixed Stereo and Mono Outputs
• Digital Tone Control and Bass Boost
• Low Power
- Down to 7mW for stereo playback (1.8V / 1.5V supplies)
- 10μW Shutdown Mode
• Low Supply Voltages
- Analogue and Digital I/O: 1.8V to 3.6V
- Digital core: 1.42V to 3.6V
• Master clocks supported: GSM, CDMA, PDC, USB or
standard audio clocks
• Audio sample rates supported: 8, 11.025, 12, 16, 22.05, 24,
32, 44.1, 48, 88.2, 96kHz
• 32-lead QFN package, 5x5x0.9mm size, 0.5mm lead pitch
APPLICATIONS
• Smartphone / Multimedia Phone
• Digital Audio Player
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Production Data, May 2010, Rev 4.3
Copyright ©2010 Wolfson Microelectronics plc
1 page  
Production Data
WM8955L
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
Supply voltages
Voltage range digital inputs
Voltage range analogue inputs
Operating temperature range, TA
Storage temperature after soldering
Notes
MIN
-0.3V
DGND -0.3V
AGND -0.3V
-25°C
-65°C
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.
MAX
+4.5V
DBVDD +0.3V
AVDD +0.3V
+85°C
+150°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range (Core)
Digital supply range (Buffer)
Analogue supplies range
Ground
SYMBOL
DCVDD
DBVDD
AVDD, HPVDD
DGND, AGND, HPGND
TEST CONDITIONS
MIN
1.42
1.71
1.8
TYP
0
MAX
3.6
3.6
3.6
UNIT
V
V
V
V
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PD, Rev 4.3, May 2010
5
5 Page 
Production Data
WM8955L
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
OFF
Low-power standby (LPS)
using 500 KOhm VMID string
Playback to Line-out
Playback to Line-out
(64x oversampling mode)
Playback
to 16 Ohm headphone
using caps on HPOUTL/R
Playback
to 16 Ohm headphone
capless mode using OUT3
Playback
to 8 Ohm BTL speaker
Headphone Amp
line-in to 16 Ohm h/phone
Speaker Amp
line-in to 8 Ohm speaker
Phone Call
diff. mono line-in to h/phone,
diff. mono line-out to TX
PLL only
PLL and CLKOUT
Maximum Power
everything ON
V I (mA) V I (mA) V I (mA) V I (mA)
(mW)
00 0 0 0 0 0 0 0 0 0 0 11 0 0 0 Clocks stopped 3.3 0.0001 3.3 0.0103 3.3 0 3.3 0
0.03432
01 0 0 0
2.5 0.0001 2.5 0.0084 2.5 0 2.5 0
0.02125
00 0 0 0
1.8 0.0001 1.5 0.0067 1.8 0 1.8 0
0.01023
10 1 0 0 0 0 0 0 0 0 0 11 0 0 0
3.3 0.2339 3.3 0.409 3.3 0.0856 3.3
0
2.40405
01 0 0 0
2.5 0.1737 2.5 0.2556 2.5 0.0616 2.5
0
1.22725
00 0 0 0
1.8 0.1208 1.5 0.1416 1.8 0.042 1.8
0
0.50544
01 1 1 1 0 0 1 1 0 0 0 11 0 0 0
3.3 3.9903 3.3 5.1104 3.3 0.0878 3.3 0.6621 32.50698
01 0 0 0
2.5 2.9459 2.5 3.5193 2.5 0.0632 2.5 0.6553 17.95925
00 0 0 0
1.8 2.0701 1.5 1.9742 1.8 0.0432 1.8 0.3845
7.45734
01 1 1 1 0 0 1 1 0 0 1 11 0 0 0
3.3 3.7821 3.3 4.2678 3.3 0.0879 3.3 0.6619 29.03901
01 0 0 0
2.5 2.7924 2.5 2.9224 2.5 0.0632 2.5 0.6557 16.08425
00 0 0 0
1.8 1.9604 1.5 1.6299 1.8 0.0432 1.8 0.3847
6.74379
01 1 1 1 1 1 0 0 0 0 0 11 0 0 0
3.3 3.9623 3.3 5.0846 3.3 0.0878 3.3 0.6913
32.4258
01 0 0 0
2.5 2.946 2.5 3.5187 2.5 0.0632 2.5 0.6691
17.9925
00 0 0 0
1.8 2.0702 1.5 1.9742 1.8 0.04332 1.8 0.3852 7.458996
01 1 1 1 1 1 0 0 0 1 0 11 0 0 0 R24, OUT3SW=00 3.3 4.0662 3.3 5.1007 3.3 0.0881 3.3 1.172
34.4091
01 0 0 0
2.5 2.999 2.5 3.557 2.5 0.064 2.5 1.167
19.4675
00 0 0 0
1.8 2.0705 1.5 1.9164 1.8 0.04272 1.8 0.914
8.8857
01 1 1 1 0 0 1 1 0 0 0 11 0 0 0 R24, ROUT2INV=1 3.3 3.9602 3.3 4.2714 3.3 0.0873 3.3 0.8068 30.11481
01 0 0 0
2.5 3.1282 2.5 3.5487 2.5 0.0639 2.5 0.8039 18.86175
00 0 0 0
1.8 2.1565 1.5 1.9671 1.8 0.04296 1.8 0.6698 8.115318
01 1 0 0 1 1 0 0 0 0 0 11 0 0 0 Clocks stopped 3.3 1.7135 3.3 0.0901 3.3
0
3.3 0.6624
8.1378
01 0 0 0
2.5 1.211 2.5 0.009 2.5
0
2.5 0.6291
4.62275
00 0 0 0
1.8 0.8017 1.5 0.0071 1.8
0
1.8 0.3869
2.15013
01 1 0 0 0 0 1 1 0 0 0 11 0 0 0 R24, ROUT2INV=1 3.3 1.7132 3.3 0.0905 3.3
0
3.3 1.158
9.77361
01 0 0 0 Clocks stopped 2.5 1.2631 2.5 0.009 2.5
0
2.5 1.0804
5.88125
00 0 0 0
1.8 0.8881 1.5 0.0071 1.8
0
1.8 0.8733
3.18117
01 1 0 0 1 1 0 0 1 1 0 11 1 0 0 Clocks stopped 3.3 1.9574 3.3 0.0905 3.3 0 3.3 1.1675 10.61082
01 1 0 0
2.5 1.4258 2.5 0.009 2.5
0
2.5 1.1017
6.34125
00 1 0 0
1.8 0.9076 1.5 0.0071 1.8
0
1.8 0.6576
2.82801
00 0 0 0 0 0 0 0 0 0 0 11 0 1 0
3.3 0.5389 3.3 0.4966 3.3 0.0855 3.3
0
3.6993
01 0 1 0
2.5 0.4554 2.5 0.2774 2.5 0.0616 2.5
0
1.986
00 0 1 0
1.8 0.4034 1.5 0.145 1.8 0.04188 1.8
0
1.019004
00 0 0 0 0 0 0 0 0 0 0 11 0 1 1
3.3 0.5389 3.3 0.4953 3.3 1.096 3.3
0
7.02966
01 0 1 1
2.5 0.4554 2.5 0.2768 2.5 0.8044 2.5
0
3.8415
00 0 1 1
1.8 0.4034 1.5 0.1448 1.8 0.57264 1.8
0
1.974072
01 1 1 1 1 1 1 1 1 1 0 11 1 1 1 R24, ROUT2INV=1 3.3 4.9869 3.3 5.1538 3.3 1.0972 3.3 1.9463 43.50786
01 1 1 1
2.5 3.737 2.5 3.544 2.5 0.8044 2.5 1.7684
24.6345
00 1 1 1
1.8 2.6827 1.5 1.97 1.8 0.57348 1.8 1.3114 11.176644
Table 1 Supply Current Consumption
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.
w
PD, Rev 4.3, May 2010
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8955LEFL.PDF ] | |
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