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PDF WM8950 Data sheet ( Hoja de datos )
| Número de pieza | WM8950 | |
| Descripción | ADC WITH MICROPHONE INPUT AND PROGRAMMABLE DIGITAL FILTERS | |
| Fabricantes | Wolfson Microelectronics plc | |
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WM8950
ADC with Microphone Input and Programmable Digital Filters
DESCRIPTION
The WM8950 is a low power, high quality mono ADC designed
for portable applications such as Digital Still Camera, Digital
Voice Recorder or games console accessories.
The device integrates support for a differential or single ended
mic. External component requirements are reduced as no
separate microphone amplifiers are required.
Advanced Sigma Delta Converters are used along with digital
decimation filters to give high quality audio at sample rates
from 8 to 48ks/s. Additional digital filtering options are
available, to cater for application filtering such as wind noise
reduction, noise rejection, plus an advanced mixed signal ALC
function with noise gate is provided.
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 WM8950 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. Different sections of the chip can also be
powered down under software control by way of the selectable
two or three wire control interface.
WM8950 is supplied in a very small 4x4mm QFN package,
offering high levels of functionality in minimum board area, with
high thermal performance.
FEATURES
Mono ADC:
Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHz
SNR 94dB, THD -83dB (‘A’-weighted @ 8 – 48ks/s)
Multiple auxiliary analogue inputs
Mic Preamps:
Differential or single end Microphone Interface
- Programmable preamp gain
- Pseudo 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
Programmable High Pass Filter (wind noise reduction)
Fully Programmable IIR Filter (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
General Purpose low power audio ADC
Games console accessories
Voice recorders
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Production Data, November 2011, Rev 4.4
Copyright 2011 Wolfson Microelectronics plc
1 page  
Production Data
WM8950
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, AVDD2 supply voltages
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
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
Ground
SYMBOL
DCVDD
DBVDD
AVDD, AVDD2
DGND, AGND, AGND2
Notes:
1. When using PLL, DCVDD must be 1.9V or higher.
2. AVDD must be DBVDD and DCVDD.
3. DBVDD must be DCVDD.
4. When using PLL, DCVDD must be 1.9V.
TEST CONDITIONS
MIN
1.711
1.71
2.5
TYP
MAX
UNIT
3.6 V
3.6 V
3.6 V
0V
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PD, Rev 4.4, November 2011
5
5 Page 
Production Data
CONTROL INTERFACE TIMING – 2-WIRE MODE
SDIN
SCLK
t3
t6
t1
t5
t2
t7
t9
t3
t4
WM8950
t8
Figure 5 Control Interface Timing – 2-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 Frequency
SCLK Low Pulse-Width
SCLK High Pulse-Width
Hold Time (Start Condition)
Setup Time (Start Condition)
Data Setup Time
SDIN, SCLK Rise Time
SDIN, SCLK Fall Time
Setup Time (Stop Condition)
Data Hold Time
Pulse width of spikes that will be suppressed
SYMBOL
t1
t2
t3
t4
t5
t6
t7
t8
t9
tps
MIN
0
1.3
600
600
600
100
600
0
TYP
MAX
UNIT
526 kHz
us
ns
ns
ns
ns
300 ns
300 ns
ns
900 ns
5 ns
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PD, Rev 4.4, November 2011
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8950.PDF ] | |
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