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WM8994 Schematic ( PDF Datasheet ) - Wolfson Microelectronics

Teilenummer WM8994
Beschreibung Multi-Channel Audio Hub CODEC
Hersteller Wolfson Microelectronics
Logo Wolfson Microelectronics Logo 




Gesamt 30 Seiten
WM8994 Datasheet, Funktion
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WM8994
Multi-Channel Audio Hub CODEC for Smartphones
DESCRIPTION
FEATURES
The WM8994[1] is a highly integrated ultra-low power hi-fi
CODEC designed for smartphones and other portable devices
rich in multimedia features.
An integrated stereo class D/AB speaker driver and class W
headphone driver minimize power consumption during audio
playback.
The device requires only two voltage supplies, with all other
internal supply rails generated from integrated LDOs.
Stereo full duplex asynchronous sample rate conversion and
multi-channel digital mixing combined with powerful analogue
mixing allow the device to support a huge range of different
architectures and use cases.
A fully programmable parametric EQ provides speaker
compensation and a dynamic range controller can be used in
the ADC or DAC paths for maintaining a constant signal level,
maximizing loudness and protecting speakers against
overloading and clipping.
A smart digital microphone interface provides power regulation,
a low jitter clock output and decimation filters for up to four
digital microphones. A MIC activity detect with interrupt is
available.
Fully differential internal architecture and on-chip RF noise filters
ensure a very high degree of noise immunity. Active ground loop
noise rejection and DC offset correction help prevent pop noise
and suppress ground noise on the headphone outputs.
Hi-fi 24-bit 4-channel DAC and 2-channel ADC
100dB SNR during DAC playback (‘A’ weighted)
Smart MIC interface
- Power, clocking and data input for up to four digital MICs
- High performance analogue MIC interface
- MIC activity detect & interrupt allows processor to sleep
2W stereo (2 x 2W) class D/AB speaker driver
Capless Class W headphone drivers
- Integrated charge pump
- 5.3mW total power for DAC playback to headphones
4 Line outputs (single-ended or differential)
BTL Earpiece driver
Digital audio interfaces for multi-processor architecture
- Asynchronous stereo duplex sample rate conversion
- Powerful mixing and digital loopback functions
ReTuneTM Mobile 5-band, 6-channel parametric EQ
Programmable dynamic range controller
Dual FLL provides all necessary clocks
- Self-clocking modes allow processor to sleep
- All standard sample rates from 8kHz to 96kHz
Active noise reduction circuits
- DC offset correction removes pops and clicks
- Ground loop noise cancellation
Integrated LDO regulators
72-ball W-CSP package (4.511 x 4.023 x 0.7mm)
APPLICATIONS
Smartphones and music phones
Portable navigation
Tablets
eBooks
Portable Media Players
WOLFSON MICROELECTRONICS plc
Production Data, April 2012, Rev 4.4
[1] This product is protected by Patents US 7,622,984, US 7,626,445,US 7,765,019 and GB 2,432,765
Copyright 2012 Wolfson Microelectronics plc






WM8994 Datasheet, Funktion
WM8994
BLOCK DIAGRAM
DMICDAT2
DMICDAT1
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Production Data
CPVDD
CPGND
LINEOUTFB
HPOUT1FB
SPKMODE
CS/ADDR
SDA
SCLK
CIFMODE
V
VS
VS
V
BCLK2
BCLK1
LRCLK2
LRCLK1
GPIO11/BCLK3
GPIO10/LRCLK3
GPIO8/DACDAT3
GPIO9/ADCDAT3
GPIO7/ADCDAT2
GPIO6/ADCLRCLK2
GPIO5/DACDAT2
GPIO4/LRCLK2
GPIO3/BCLK2
ADCLRCLK1/GPIO1
ADCDAT1
DACDAT1
LRCLK1
BCLK1
LDO2ENA
LDO1ENA
VREFC
MCLK1
GPIO2/MCLK2
AVDD1
VMIDC
AGND
REFGND
PD, April 2012, Rev 4.4
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6 Page









WM8994 pdf, datenblatt
WM8994
Production Data
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
Digital supply range (Core)
See notes 7, 8
DCVDD
0.95
1.0
2.0
V
Digital supply range (I/O)
Analogue supply 1 range
See notes 3, 4, 5, 6
DBVDD
AVDD1
1.62
1.8
2.4 3.0
3.6
3.3
V
V
Analogue supply 2 range
Charge Pump supply range
AVDD2
CPVDD
1.71
1.8
1.71
1.8
2.0
2.0
V
V
Speaker supply range
LDO1 supply range
SPKVDD1, SPKVDD2
2.7
5.0
5.5
LDO1VDD
2.7 5.0 5.5
V
V
LDO2 supply range
Ground
LDO2VDD
DGND, AGND, CPGND,
SPKGND1, SPKGND2,
REFGND, HP2GND
1.71
1.8
0
2.0
V
V
Power supply rise time
See notes 9, 10, 11
All supplies
1
s
Operating temperature range
Notes
TA -40
85 °C
1. Analogue, digital and speaker grounds must always be within 0.3V of AGND.
2. There is no power sequencing requirement; the supplies may be enabled in any order.
3. AVDD1 must be less than or equal to SPKVDD1 and SPKVDD2.
4. An internal LDO (powered by LDO1VDD) can be used to provide the AVDD1 supply.
5. When AVDD1 is supplied externally (not from LDO1), the LDO1VDD voltage must be greater than or equal to AVDD1
6. The WM8994 can operate with AVDD1 tied to 0V; power consumption may be reduced, but the analogue audio
functions will not be supported.
7. An internal LDO (powered by LDO2VDD) can be used to provide the DCVDD supply.
8. When DCVDD is supplied externally (not from LDO2), the LDO2VDD voltage must be greater than or equal to DCVDD
9. DCVDD and AVDD1 minimum rise times do not apply when these domains are powered using the internal LDOs.
10. The specified minimum power supply rise times assume a minimum decoupling capacitance of 100nF per pin.
However, Wolfson strongly advises that the recommended decoupling capacitors are present on the PCB and that
appropriate layout guidelines are observed (see “Applications Information” section).
11. The specified minimum power supply rise times also assume a maximum PCB inductance of 10nH between
decoupling capacitor and pin.
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PD, April 2012, Rev 4.4
12

12 Page





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