CMAMP110 Ver la hoja de datos (PDF) - California Micro Devices Corp
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CMAMP110 Datasheet PDF : 7 Pages
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Microphone Amplifier
CMAMP110
Features
• Microsoft PC99 & PC2001 compliant
• Differential and Single-ended Microphone Inputs
• Internally frequency compensated for unity gain
• 20dB DC voltage gain (maximum)
• Buffered DCbias voltagefor external microphone
• Very low supply current (< 3.0 mA)
• 20KΩ minimum input impedance
• Low Total Harmonic Distortion (0.03% at
1 KHz typical)
• Small MSOP package
• Lead-free version available
Applications
• Computers
• Mobile Phones
• PDA's
• MP3 Players
• Digital Cameras
• Video Tape Recorders
Product Description
The CMAMP110 Microphone Amplifier selects (via
MIC_SELECT) between and amplifies Internal and
External Microphone input signals. The device is
designed to be compliant with Microsoft PC99 and
PC2001 specifications. The CMAMP110 contains the
equivalent of 7 operational amplifiers and 19 precision
resistors, and is intended for use in PC audio applica-
tions. The Internal Microphone input is differential, but
it can also be used single-ended by simply grounding
one of the inputs through a capacitor. The External
Microphone input is single-ended. A logic high level on
the MIC_SELECT pin selects the external microphone
input. Since the chip supplies the DC bias for the exter-
nal microphone (EXT_MIC_BIAS), both dynamic and
electret type microphones may be used. The output
amplifier is unity gain stable and is capable of driving a
resistive load in excess of 10KΩ.
The CMAMP110 Microphone Amplifier is housed in a
space saving MSOP-8 package and is optionally avail-
able with lead-free finishing.
Electrical Schematic
EXT_MIC_IN 8
INT_MIC+ 6
INT_MIC− 5
MIC_SELECT 1
V+
4
SW1
SW2
VREF
2.5K 3
RBIAS
EXT_MIC_BIAS
2 VOUT
7 V−
© 2004 California Micro Devices Corp. All rights reserved.
01/09/04 430 McCarthy Blvd., Milpitas, California 95035L Tel: (408) 263-3214 L Fax: (408) 263-7846 L www.calmicro.com
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