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WM7211E Schematic ( PDF Datasheet ) - Cirrus Logic

Teilenummer WM7211E
Beschreibung Top Port Digital Silicon Microphone
Hersteller Cirrus Logic
Logo Cirrus Logic Logo 




Gesamt 13 Seiten
WM7211E Datasheet, Funktion
WM7211E
Top Port Digital Silicon Microphone
DESCRIPTION
The WM7211 is a low-profile silicon digital microphone. It
offers high Signal-to-Noise Ratio (SNR) and low power
consumption and is suited to a wide variety of consumer
applications.
The WM7211 incorporates Cirrus’s proprietary
CMOS/MEMS membrane technology, offering high
reliability and high performance in a miniature, low-profile
package. The WM7211 is designed to withstand the high
temperatures associated with automated flow solder
assembly processes. (Note that conventional microphones
can be damaged by this process.)
The WM7211 incorporates a high performance ADC,
which outputs a single-bit data stream using Pulse Density
Modulation (PDM) encoding. The WM7211 supports
selectable left/right channel assignment for a two-channel
digital microphone interface, enabling efficient connection
of multiple microphones in stereo/array configurations.
The WM7211 offers tight tolerance on the microphone
sensitivity, giving reduced variation between parts. This
removes the need for in-line production calibration of part-
to-part microphone variations.
FEATURES
High SNR (61dB)
Low variation in sensitivity (±1dB tolerance)
Low current consumption
- 2μA (Sleep)
- 735μA (Normal operation)
PDM digital audio output
Stereo/array operation
Proprietary ADC technology
- Reduced clock jitter sensitivity
- Low noise floor
- Stable in overload condition
Top Port LGA Package
1.64V to 3.7V supply
APPLICATIONS
Mobile telephone handsets
Portable computers
Portable media players
Digital still cameras
Digital video cameras
Bluetooth headsets
Portable navigation devices
BLOCK DIAGRAM
WM7211
VDD
CHARGE
PUMP
CONTROL
3D VIEW
CLK
DAT
LRSEL
CMOS MEMS
Transducer
AMP
ADC
GND
4.00mm x 3.00mm x 1.00mm LGA package
http://www.cirrus.com
Copyright Cirrus Logic, Inc., 20112016
(All Rights Reserved)
Rev 4.0
MAR ‘16






WM7211E Datasheet, Funktion
WM7211E
TERMINOLOGY
1. Sensitivity (dBFS) Sensitivity is a measure of the microphone output response to the acoustic pressure of a 1kHz 94dB SPL
(1Pa RMS) sine wave. This is referenced to the output Full Scale Range (FSR) of the microphone.
2. Full Scale Range (FSR) - Sensitivity, Electrical Noise Floor and Power Supply Rejection are measured with reference to the
output Full Scale Range (FSR) of the microphone. FSR is defined as the amplitude of a 1kHz sine wave output whose positive
peak value reaches 100% density of logic 1s and whose negative peak value reaches 0% density of logic 1s. This is the largest
1kHz sine wave that will fit in the digital output range without clipping. Note that, because the definition of FSR is based on a
sine wave, it is possible to support a square wave test signal output whose level is +3dBFS.
3. Total Harmonic Distortion (%) THD is the ratio of the RMS sum of the harmonic distortion products in the specified bandwidth
(see note below) relative to the RMS amplitude of the fundamental (ie. test frequency) output.
4. Signal-to-Noise Ratio (dB) SNR is a measure of the difference in level between the output response of a 1kHz 94dB SPL
sine wave and the idle noise output.
5. Dynamic Range (dB) DR is the ratio of the 1% THD microphone output level (in response to a sine wave input) and the idle
noise output level.
6. All performance measurements are carried out within a 20Hz to 20kHz bandwidth and, where noted, an A-weighted filter.
Failure to use these filters will result in higher THD and lower SNR values than are found in the Acoustic and Electrical
Characteristics. The brick wall filter removes out of band noise.
7. Sleep Mode is enabled when the CLK input is below the CLK Sleep Frequency noted above. This is a power-saving mode.
Normal operation resumes automatically when the CLK input is above the CLK Sleep Frequency. Note that the VDD supply is
still required in Sleep mode.
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WM7211E pdf, datenblatt
IMPORTANT NOTICE
WM7211E
Contacting Cirrus Logic Support
For all product questions and inquiries, contact a Cirrus Logic Sales Representative.
To find one nearest you, go to www.cirrus.com.
The products and services of Cirrus Logic International (UK) Limited; Cirrus Logic, Inc.; and other companies in the Cirrus Logic
group (collectively either “Cirrus Logic” or “Cirrus”) are sold subject to Cirrus Logic’s terms and conditions of sale supplied at the
time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. Software is provided
pursuant to applicable license terms. Cirrus Logic reserves the right to make changes to its products and specifications or to
discontinue any product or service without notice. Customers should therefore obtain the latest version of relevant information from
Cirrus Logic to verify that the information is current and complete. Testing and other quality control techniques are utilized to the
extent Cirrus Logic deems necessary. Specific testing of all parameters of each device is not necessarily performed. In order to
minimize risks associated with customer applications, the customer must use adequate design and operating safeguards to
minimize inherent or procedural hazards. Cirrus Logic is not liable for applications assistance or customer product design. The
customer is solely responsible for its selection and use of Cirrus Logic products. Use of Cirrus Logic products may entail a choice
between many different modes of operation, some or all of which may require action by the user, and some or all of which may be
optional. Nothing in these materials should be interpreted as instructions or suggestions to choose one mode over another.
Likewise, description of a single mode should not be interpreted as a suggestion that other modes should not be used or that they
would not be suitable for operation. Features and operations described herein are for illustrative purposes only.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL
INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS LOGIC PRODUCTS
ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY,
AUTOMOTIVE SAFETY OR SECURITY DEVICES, NUCLEAR SYSTEMS, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL
APPLICATIONS. INCLUSION OF CIRRUS LOGIC PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT
THE CUSTOMER’S RISK AND CIRRUS LOGIC DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR
IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE,
WITH REGARD TO ANY CIRRUS LOGIC PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR
CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS LOGIC PRODUCTS IN CRITICAL APPLICATIONS,
CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS LOGIC, ITS OFFICERS, DIRECTORS, EMPLOYEES,
DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT
MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.
This document is the property of Cirrus Logic and by furnishing this information, Cirrus Logic grants no license, express or implied,
under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Any provision or
publication of any third party’s products or services does not constitute Cirrus Logic’s approval, license, warranty or endorsement
thereof. Cirrus Logic gives consent for copies to be made of the information contained herein only for use within your organization
with respect to Cirrus Logic integrated circuits or other products of Cirrus Logic, and only if the reproduction is without alteration and
is accompanied by all associated copyright, proprietary and other notices and conditions (including this notice). This consent does
not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for
resale. This document and its information is provided “AS IS” without warranty of any kind (express or implied). All statutory
warranties and conditions are excluded to the fullest extent possible. No responsibility is assumed by Cirrus Logic for the use of
information herein, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents
or other rights of third parties. Cirrus Logic, Cirrus, the Cirrus Logic logo design, and SoundClear are among the trademarks of
Cirrus Logic. Other brand and product names may be trademarks or service marks of their respective.
Copyright © 20112016 Cirrus Logic, Inc. All rights reserved.
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