MAX9813HEKA+T

Audio Amplifiers Overview

The MAX9813HEKA+T is a dual-input, fixed-gain microphone amplifier in an 8-pin SOT23 package. It operates on a 4.5V to 5.5V supply with a typical quiescent current of 230µA and features a 20dB voltage gain. The device includes a low-noise integrated microphone bias output regulated at 4.0V. Key electrical characteristics include a 400kHz bandwidth, rail-to-rail outputs, and a shutdown mode reducing current to 100nA.

Audio Amplifiers Feature Summary

• Dual-input architecture with fast multiplexing for connecting two microphones to a single output
• Integrated low-noise microphone bias supply optimized for electret condenser microphones
• Rail-to-rail output stage providing wide dynamic range operation
• Low-power shutdown mode significantly reduces standby current consumption

Audio Amplifiers Applications

• Notebook computers
• Cell phones
• Personal digital assistants (PDAs)

Audio Amplifiers Procurement Notes

Verify the specific H suffix indicates the 4.5V to 5.5V operating grade distinct from the L version. Confirm the K8+1 SOT23-8 package code matches design requirements. Ensure lead-free/RoHS compliance aligns with project specifications. Cross-reference the manufacturer's latest documentation for any potential pinout or parameter updates.

Audio Amplifiers Selection Notes

Select this component when a dual-microphone input solution is required within a compact footprint. The fixed 20dB gain simplifies circuit design by eliminating external feedback networks. The integrated bias supply reduces bill-of-materials count. Verify that the 4.5V to 5.5V supply range matches the system power rails.

Audio Amplifiers Part Context

This part belongs to the MAX9812/MAX9813 family of tiny, low-cost microphone amplifiers. The MAX9813 variant specifically provides dual inputs compared to the single-input MAX9812. The 'H' designation denotes the high-voltage grade optimized for 5V systems, while the 'L' grade supports 3.3V operation.

Audio Amplifiers Replacement Considerations

MAX9813LEKA+T serves as a direct functional substitute for 3.3V applications.