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PDF ( 数据手册 , 数据表 ) WM7132PE

零件编号 WM7132PE
描述 Bottom Port Analog Silicon Microphone
制造商 Cirrus Logic
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WM7132PE 数据手册, 描述, 功能
WM7132PE
Bottom Port Analog Silicon Microphone
DESCRIPTION
The WM7132P is a low-profile silicon analog microphone. It
offers high Signal to Noise Ratio (SNR) and low power
consumption and is suited to a wide variety of consumer
applications.
The WM7132P incorporates Cirrus proprietary
CMOS/MEMS membrane technology, offering high reliability
and high performance in a miniature, low-profile package.
The WM7132P 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 WM7132P Bottom Port microphone offers matched
performance to the WM7121P Top Port microphone. The
matched characteristics enable highly accurate sound pick-
up in opposite directions, suitable for noise cancellation and
other DSP algorithms.
The WM7132P offers a 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 (65dB)
Low variation in sensitivity (±1dB tolerance)
Matched pair with Top Port microphone WM7121P
- Matched sensitivity, roll-off, and phase response
Low current consumption (190µA)
Analog output
Bottom Port LGA Package
1.5V to 3.7V supply
APPLICATIONS
Mobile phone handsets
Portable media players
Digital still cameras
Digital video cameras
Bluetooth headsets
Portable navigation devices
Portable games consoles
BLOCK DIAGRAM
WM7132P
VDD
CHARGE
PUMP
3D VIEW
CMOS MEMS
Transducer
AMP
GND
OUTPUT
3.76mm x 3.00mm x 1.10mm LGA package
http://www.cirrus.com
Copyright Cirrus Logic, Inc., 20142015
(All Rights Reserved)
Rev 4.0
MAR ‘15







WM7132PE pdf, 数据表
WM7132PE
CONNECTION TO A CIRRUS AUDIO CODEC
Cirrus provides a range of audio CODECs incorporating an analog microphone input interface; these
support connection to silicon microphones such as the WM7132P.
The recommended connection of a WM7132P silicon microphone is illustrated in Figure 2 (for single-
ended mode) and Figure 3 (for pseudo-differential mode).
A DC blocking capacitor is required, as described in the previous section. A 2.2µF decoupling
capacitor is also recommended; this should be positioned close to the VDD pin of the WM7132P.
Further information on Cirrus audio CODECs is provided in the respective product datasheet, which is
available from the Cirrus website.
WM7132P VDD
2.2F
OUTPUT
1F
Audio CODEC
MICBIAS
Analogue Input pin
(eg. IN1xP)
GND
Figure 2 WM7132P Silicon Microphone Single-ended Connection
WM7132P VDD
GND
2.2F
OUTPUT
1F
1F
Audio CODEC
MICBIAS
Non-Inverting Input pin
(eg. IN1xP)
Inverting Input pin
(eg. IN1xN)
Figure 3 WM7132P Silicon Microphone Pseudo-differential Connection
MATCHED MICROPHONE PAIRS
The WM7132P Bottom Port microphone offers matched performance to the WM7121P Top Port
microphone.
Matched microphone pairs are ideal for accurate sound pick-up from opposite directions in slim, low-
profile applications. For best acoustic matching, the Top Port and Bottom Port microphones should be
positioned close together, on the same side of the PCB.
The WM7132P and WM7121P microphones offer matched sensitivity, low-frequency roll-off, and
phase response characteristics, enabling simplified system design when using these complementary
devices.
8 Rev 4.0














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