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ADMP521 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADMP521
Beschreibung Ultralow Noise Microphone
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADMP521 Datasheet, Funktion
Data Sheet
Ultralow Noise Microphone with
Bottom Port and PDM Digital Output
ADMP521
FEATURES
Small and thin 4 mm × 3 mm × 1 mm surface-mount package
Omnidirectional response
Very high SNR: 65 dBA
Sensitivity of −26 dBFS
Extended frequency response from 100 Hz to 16 kHz
Low current consumption: 900 µA
Sleep mode for extended battery life, <1 µA consumption
120 dB maximum SPL
High PSR of −80 dBFS
Fourth-order Σ-Δ modulator
Digital PDM output
Compatible with Sn/Pb and Pb-free solder processes
RoHS/WEEE compliant
FUNCTIONAL BLOCK DIAGRAM
ADMP521
ADC
PDM
MODULATOR
POWER
MANAGEMENT
CHANNEL
SELECT
CLK
DATA
Figure 1.
APPLICATIONS
Smartphones and feature phones
Tablet computers
Teleconferencing systems
Digital still and video cameras
Bluetooth headsets
Notebook PCs
Security and surveillance
http://www.DataSheet4U.net/
BOTTOM
TOP
Figure 2. Isometric Views of ADMP521 Microphone Package
GENERAL DESCRIPTION
The ADMP5211 is a high performance, ultralow noise, low
power, digital output, bottom-ported omnidirectional MEMS
microphone. The ADMP521 consists of a MEMS microphone
element and an impedance converter amplifier followed by a
fourth-order sigma-delta (Σ-Δ) modulator. The digital interface
allows for the pulse density modulated (PDM) output of two
microphones to be time-multiplexed on a single data line using
a single clock. The ADMP521 is function and pin compatible with
the ADMP421 microphone, providing an easy upgrade path.
The ADMP521 has a very high signal-to-noise ratio (SNR) and
common sensitivity of −26 dBFS, making it an excellent choice
for far field applications. The ADMP521 has an extended wide-
band frequency response resulting in natural sound with high
intelligibility. Low current consumption and a sleep mode with
less than 1 µA current consumption enables long battery life
for portable applications. The ADMP521 complies with the
TIA-920 Tele-communications Telephone Terminal Equipment
Transmission Requirements for Wideband Digital Wireline
Telephones standard.
The ADMP521 is available in a thin 4 mm × 3 mm × 1 mm
surface-mount package. It is reflow solder compatible with
no sensitivity degradation. The ADMP521 is halide free.
1 Protected by U.S. Patents 7,449,356; 7,825,484; 7,885,423; 7,961,897. Other patents are pending.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.
datasheet pdf - http://www.DataSheet4U.net/






ADMP521 Datasheet, Funktion
ADMP521
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Data Sheet
DATA
5 1 CLK
VDD 4 2 L/R SELECT
3 GND
Figure 5. Pin Configuration (Bottom View)
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 CLK
Clock Input to Microphone.
2 L/R SELECT Left Channel or Right Channel Select.
DATA1 (right): L/R SELECT tied to GND.
DATA2 (left): L/R SELECT pulled to VDD.
3 GND
Ground.
4 VDD
Power Supply. Placing a 0.1 µF (100 nF) ceramic type X7R capacitor between Pin 4 (VDD) and ground is strongly
recommended for best performance and to avoid potential parasitic artifacts. Place the capacitor as close to Pin 4
as possible.
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5 DATA Digital Output Signal (DATA1, DATA2).
Rev. A | Page 6 of 16
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6 Page









ADMP521 pdf, datenblatt
ADMP521
ALTERNATIVE PCB LAND PATTERNS
The standard PCB land pattern of the ADMP521 has a solid ring
around the edge of the footprint that may make routing the
microphone signals more difficult in some board designs. This
ring is used to improve the RF immunity performance of the
ADMP521; however, it is not necessary to have this full ring
connected for electrical functionality. If a design can tolerate
reduced RF immunity, this ring can either be broken or removed
completely from the PCB footprint. Figure 17 shows an example
PCB land pattern with no enclosing ring around the edge of the
part, and Figure 18 shows an example PCB land pattern with the
ring broken on two sides so that the inner pads can be more
easily routed on the PCB.
Figure 17. Example PCB Land Pattern with No Enclosing Ring
Data Sheet
Figure 18. Example PCB Land Pattern with Broken Enclosing Ring
Note that in both of these patterns, the solid ring around the sound
port is still present; this ring is needed to ground the microphone
and for acoustic performance. The pad on the package connected
to this ring is ground and still needs a solid electrical connection to
the PCB ground. If a pattern like one of these two examples is
used on a PCB, take care that the unconnected ring on the bottom
of the ADMP521 is not placed directly over any exposed copper.
This ring on the microphone is still at ground and any PCB traces
routed underneath it need to be properly masked to avoid short
circuits.
PCB MATERIAL AND THICKNESS
The performance of the ADMP521 is not affected by PCB
thickness and can be mounted on both a rigid and flexible PCB.
A flexible PCB with the microphone can be attached directly to
thehttp://www.DataSheet4U.net/ device housing with an adhesive layer. This mounting method
offers a reliable seal around the sound port, while providing the
shortest acoustic path for good sound quality.
Rev. A | Page 12 of 16
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