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WM8850 Schematic ( PDF Datasheet ) - Wolfson Microelectronics

Teilenummer WM8850
Beschreibung Multi Channel HDA CODEC
Hersteller Wolfson Microelectronics
Logo Wolfson Microelectronics Logo 




Gesamt 23 Seiten
WM8850 Datasheet, Funktion
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WM8850
Multi-Channel High Definition Audio CODEC
DESCRIPTION
FEATURES
The WM8850 is a high performance multi-channel audio
CODEC designed for high performance PC audio systems. The
device offers full compatibility with the Intel High Definition
Audio (HDA) specification revision 1.0, allowing seamless
integration with industry-standard HDA controllers.
The WM8850 has three high performance stereo DACs to
enable six channels of high definition audio, ideal for 5.1
channel applications. A high-performance ground-referenced
stereo headphone amplifier utilises advanced charge pump and
DC servo technology to minimise system cost and space
without compromise on audio quality. Line outputs provide a
high-quality differential connection to speaker amplifiers,
enabling common mode noise rejection when these traces are
routed across a PCB.
The WM8850 also has two high performance stereo ADCs to
provide Hi-Fi quality analogue line-in and microphone input
digitisation. A low noise microphone bias with programmable
output voltage is provided. Additionally, the CODEC contains a
digital microphone interface capable of supporting up to four
independent digital microphones. One differential stereo input
is provided for line level signals, while one pseudo-differential
stereo input with integrated microphone preamplifier is provided.
The WM8850 also contains a S/PDIF transceiver which is fully
compatible with IEC-60958-3. The S/PDIF receive and transmit
paths each contain a sample rate converter (SRC) to enable
asynchronous sample rate conversion between the S/PDIF
receive/transmit and HDA interface clock domains. An
additional S/PDIF transmitter is provided to allow direct output
of a stereo stream from the HDA interface.
Multi-channel High Definition Audio CODEC
Fully compatible with Intel High Definition Audio Revision 1.0
6-Channel DAC, 4-channel ADC
DAC sampling frequency 8kHz - 192kHz
ADC sampling frequency 8kHz - 96kHz
DAC Performance:
- SNR 108 dB (‘A’ weighted)
- SNR 105dB (non weighted)
- THD -96dB (at 0dBFS)
ADC Performance:
- SNR 105 dB (‘A’ weighted)
- SNR 102dB (non weighted)
- THD -95dB (at -1dBFS)
Ground-referenced stereo headphone driver
Differential line inputs/outputs
Stereo microphone interface with integrated pre-amp
Multi-channel digital microphone interface
IEC-60958-3 compatible S/PDIF transceiver
Additional IEC-60958-3 compatible S/PDIF transmitter
Jack detect and load impedance sensing
Beep generator
GPIO functionality
IEEE-754 Single precision 32-bit floating point support
Power supplies
- Digital core: 1.62V – 1.98V
- Digital buffer: 2.97V – 3.63V
- Analogue:
4.5V – 5.5V
- Charge pump: 4.5V – 5.5V
48-pin 7mm x 7mm QFN package
APPLICATIONS
The WM8850 is supplied in a small 48-pin QFN package.
High performance PC audio
All-in-one desktop PC
Notebook PC
WOLFSON MICROELECTRONICS plc
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Product Brief, January 2011, Rev 3.0
Copyright ©2011 Wolfson Microelectronics plc






WM8850 Datasheet, Funktion
WM8850
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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
Analogue supply voltage (AVDD)
Charge pump supply voltage (CPVDD)
Digital core supply voltage (DCVDD)
Digtial buffer supply voltage (DBVDD)
Voltage range digital inputs
Voltage range analogue inputs
Operating temperature range, TA
Junction temperature, TJMAX
Storage temperature after soldering
MIN
-0.3V
-0.3V
-0.3V
-0.3V
DGND -0.3V
AGND -0.3V
-40ºC
-40ºC
-65ºC
MAX
+7V
+7V
+2.5V
+7V
DBVDD +0.3V
AVDD +0.3V
+85ºC
+150ºC
+150ºC
RECOMMENDED OPERATING CONDITIONS
PARAMETER
CODEC Power Supplies
Digital core supply range
Digital buffer supply range
Analogue supply range
Charge pump supply range
Ground
SYMBOL
MIN TYP MAX
DCVDD
1.62 1.8 1.98
DBVDD
2.97 3.3 3.63
AVDD
4.5 5.0 5.5
CPVDD
4.5 5.0 5.5
DGND, AGND, HPGND
0
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 (i.e. not internally connected).
UNIT
V
V
V
V
V
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Product Brief, January 2011, Rev 3.0
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WM8850 pdf, datenblatt
WM8850
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Test Conditions
AVDD = CPVDD = 5V, DBVDD = 3.3V, DCVDD = 1.8V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit data unless otherwise stated.
PARAMETER
SYMBOL
Analogue Output 1 (VOUT1L, VOUT1R)
Full Scale Output Signal
Level
VOUT
TEST CONDITIONS
RL = 1k
to 47k
H-Phn
Enable = 0
RL = 16
to 1k
H-Phn
Enable = 1
MIN TYP MAX UNIT
2x
AVDD/5
VRMS
0.8 x
AVDD/5
VRMS
Maximum Rated Output
Power
POUT(max)
RL = 16
40 mW
Load Impedance
RL
16 47k
Load Capacitance
CL
1
DC Offset
Measured between VOUT1L/R and AGND with
path fully enabled but no signal playing
-1
0
+1
Analogue Output 2 (VOUT2L, VOUT2LN, VOUT2RP, VOUT2RN)
Differential Full Scale
Output Signal Level
VOUT
RL = 5k
to 47k
2x
AVDD/5
nF
mV
VRMS
Single-ended Full Scale
Output Signal Level
VOUT
RL = 5k
to 47k
Load Impedance
RL
Load Capacitance
CL
Analogue Output 3 (VOUT3L, VOUT3LN, VOUT3RP, VOUT3RN)
Differential Full Scale
Output Signal Level
VOUT
RL = 5k
to 47k
1x
AVDD/5
VRMS
5 47 k
1 nF
2x
AVDD/5
VRMS
Single-ended Full Scale
Output Signal Level
Load Impedance
Load Capacitance
VOUT
RL
CL
RL = 5k
to 47k
1x
AVDD/5
5 47
1
VRMS
k
nF
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