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PDF WM8974 Data sheet ( Hoja de datos )
| Número de pieza | WM8974 | |
| Descripción | MONO CODEC WITH SPEAKER DRIVER | |
| Fabricantes | Wolfson Microelectronics plc | |
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WM8974
Mono CODEC with Speaker Driver
DESCRIPTION
The WM8974 is a low power, high quality mono CODEC
designed for portable applications such as Digital Still Camera
or Digital Voice Recorder.
The device integrates support for a differential or single ended
mic, and includes drivers for speakers or headphone, and
mono line output. External component requirements are
reduced as no separate microphone or headphone amplifiers
are required.
Advanced Sigma Delta Converters are used along with digital
decimation and interpolation filters to give high quality audio at
sample rates from 8 to 48ks/s. Additional digital filtering
options are available in the ADC path, to cater for application
filtering such as ‘wind noise reduction’, plus an advanced
mixed signal ALC function with noise gate is provided. The
digital audio interface supports A-law and -law companding.
An on-chip PLL is provided to generate the required Master
Clock from an external reference clock. The PLL clock can
also be output if required elsewhere in the system.
The WM8974 operates at supply voltages from 2.5 to 3.6V,
although the digital supplies can operate at voltages down to
1.71V to save power. The speaker and mono outputs use a
separate supply of up to 5V which enables increased output
power if required. Different sections of the chip can also be
powered down under software control by way of the selectable
two or three wire control interface.
WM8974 is supplied in a very small 4x4mm QFN package,
offering high levels of functionality in minimum board area, with
high thermal performance.
FEATURES
Mono CODEC:
Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHz
DAC SNR 98dB, THD -84dB (‘A’-weighted @ 8 – 48ks/s)
ADC SNR 94dB, THD -83dB (‘A’-weighted @ 8 – 48ks/s)
On-chip Headphone/Speaker Driver with ‘cap-less’ connect
- 40mW output power into 16 / 3.3V SPKVDD
- BTL speaker drive 0.9W into 8 / 5V SPKVDD
Additional MONO Line output
Multiple analogue or ‘Aux’ inputs, plus analog bypass path
Mic Preamps:
Differential or single end Microphone Interface
- Programmable preamp gain
- Psuedo differential inputs with common mode rejection
- Programmable ALC / Noise Gate in ADC path
Low-noise bias supplied for electret microphones
OTHER FEATURES
5 band EQ (record or playback path)
Digital Playback Limiter
Programmable ADC High Pass Filter (wind noise reduction)
Programmable ADC Notch Filter
On-chip PLL
Low power, low voltage
- 2.5V to 3.6V (digital: 1.71V to 3.6V)
- power consumption <10mA all-on 48ks/s mode
4x4x0.9mm 24 lead QFN package
APPLICATIONS
Digital Still Camera Audio CODEC
Wireless VoIP and other communication device handsets /
headsets
Portable audio recorder
General Purpose low power audio CODEC
WOLFSON MICROELECTRONICS plc
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Production Data, Rev 4.6, November 2011
Copyright 2011 Wolfson Microelectronics plc
1 page  
Production Data
WM8974
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 <30C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
DBVDD, DCVDD, AVDD supply voltages
SPKVDD supply voltage
Voltage range digital inputs
Voltage range analogue inputs
Operating temperature range, TA
Storage temperature prior to soldering
Storage temperature after soldering
MIN MAX
-0.3V
+4.2
-0.3V
+7V
DGND -0.3V
DVDD +0.3V
AGND -0.3V
AVDD +0.3V
-40C
+85C
30C max / 85% RH max
-65C
+150C
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.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range (Core)
Digital supply range (Buffer)
Analogue supplies range
Speaker supply
Ground
SYMBOL
DCVDD
DBVDD
AVDD
SPKVDD
DGND,AGND,SPKGND
TEST CONDITIONS
MIN
1.71
1.71
2.5
2.5
Notes:
1. When using PLL, DCVDD must be 1.9V or higher.
2. AVDD must be DCVDD.
3. DBVDD must be DCVDD.
4. In non-boosted mode, SPKVDD must be AVDD, if boosted SPKVDD must be 1.5x AVDD.
5. When using PLL, DCVDD must be 1.9V.
TYP
0
MAX
3.6
3.6
3.6
5.5
UNIT
V
V
V
V
V
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PD, Rev 4.6, November 2011
5
5 Page 
Production Data
CONTROL INTERFACE TIMING – 3-WIRE MODE
WM8974
Figure 4 Control Interface Timing – 3-Wire Serial Control Mode
Test Conditions
DCVDD = 1.8V, DBVDD = AVDD = SPKVDD = 3.3V, DGND = AGND = SPKGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz,
MCLK = 256fs, 24-bit data, unless otherwise stated.
PARAMETER
Program Register Input Information
SCLK rising edge to CSB rising edge
SCLK pulse cycle time
SCLK pulse width low
SCLK pulse width high
SDIN to SCLK set-up time
SCLK to SDIN hold time
CSB pulse width low
CSB pulse width high
CSB rising to SCLK rising
Pulse width of spikes that will be suppressed
SYMBOL
tSCS
tSCY
tSCL
tSCH
tDSU
tDHO
tCSL
tCSH
tCSS
tps
MIN
TYP
MAX
UNIT
80 ns
200 ns
80 ns
80 ns
40 ns
40 ns
40 ns
40 ns
40 ns
0 5 ns
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PD, Rev 4.6, November 2011
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8974.PDF ] | |
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