CMAMP110

www.DataSheet4U.com CMAMP110 Microphone Amplifier Features Microsoft PC99 & PC2001 compliant Differential and Single-ended Microphone Inputs Internally frequency compensated for unity gain 20dB DC voltage gain (maximum) Buffered DC bias voltage for 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 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 applications. 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 external 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. Applications Computers Mobile Phones PDA's MP3 Players Digital Cameras Video Tape Recorders The CMAMP110 Microphone Amplifier is housed in a ...