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LMV1022 Datasheet

PDM Output Pre-Amplifier for Electret Microphones

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LMV1022/LMV1023
OBSOLETE
July 8, 2011
PDM Output Pre-Amplifier for Electret Microphones
General Description
The LMV1022 and LMV1023 integrate a pre-amplifier and
ADC that can be mounted inside an electret condenser mi-
crophone (ECM). The digital output signal is a pulse density
modulation (PDM) bitstream that alows the microphone to
connect directly to the DSP or baseband processor.
Part of National Semiconductor’s Powerwise™ family of prod-
ucts, the LMV1022/LMV1023 consume 900µW of power dur-
ing operation, offering significant power savings over an
analog microphone with an external ADC. The LMV1022 out-
puts its data on the rising clock edge. The LMV1023 outputs
its data on the falling clock edge. Both devices can share the
same clock and data lines to create a 4-wire stereo solution.
The external clock frequency sets the audio pass band fre-
quency. An 800kHz clock sets the pass band to 7kHz. A
2.4MHz clock sets the pass band to 20kHz.
The LMV1022 and LMV1023 are available in 6-bump micro
SMD packages with 1kg adhesion properties.
Key Specifications
(Typical VDD = 1.8V, CLOCK = 1.2MHz, fINPUT = 1kHz,
VINPUT = 18mVPP, unless otherwise specified)
SNR A-weighted
61dB
Analog A-weighted noise floor
5 µVRMS
Supply current
0.5mA
Total harmonic distortion
0.05%
Power supply rejection ratio
87dB
Features
Integrated 21 dB Pre-Amp and ADC for significant power
and space savings
Integrated high-pass Filter to reduce 'Plop Noise'
Excellent RF immunity (e.g. buzz noise)
LMV1022 and LMV1023 combine to create 4-wire Stereo
Solution
Very thin 0.35mm micro SMD packaging
Adhesion technology >1kg
Applications
Digital audio subsystems and stereo arrays
Electret condenser microphones with all digital output
Portable communications and small form factor devices
Digital audio computing or voice security
Automotive or array systems
Headphone and headset accessories
Typical Application
For a stereo application, see STEREO OPERATION in the Application Section.
20212475
© 2011 National Semiconductor Corporation 202124
202124 Version 2 Revision 1 Print Date/Time: 2011/07/08 14:36:52
www.national.com


National Semiconductor Electronic Components Datasheet

LMV1022 Datasheet

PDM Output Pre-Amplifier for Electret Microphones

No Preview Available !

Connection Diagram
6-Bump Ultra Thin micro SMD
Top View
20212427
Pin Descriptions
Power Supply
Input
Pin
A2
C1
C2
Name
VDD
GND
Input
Reference
Clock Input
B1
A1
VREF
Clock
Data Output
B2
Data
Description
Positive supply voltage
Ground
The microphone is connected to this input pin.
A capacitor of 100nF is connected between VREF and ground. This capacitor is used to filter
the internal converter reference voltage.
The user adjustable clock frequency ranges from 800kHz to 2.4MHz.
Over sampled bitstream output. Data is valid if clock is LOW (LMV1022). The data of the
LMV1023 is valid when clock is HIGH. When the data is not valid the data output is high
impedance. For exact specifications see application section.
Ordering Information
Package
6-Bump Ultra Thin micro SMD
lead free only
Part Number
LMV1022UR
LMV1022URX
LMV1023UR
LMV1023URX
Package Marking
Z
1
Transport Media
250 Units Tape and Reel
3k Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
NSC Drawing
URA06GGA
www.national.com
2
202124 Version 2 Revision 1 Print Date/Time: 2011/07/08 14:36:52


Part Number LMV1022
Description PDM Output Pre-Amplifier for Electret Microphones
Maker National Semiconductor
Total Page 19 Pages
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