NATIONAL Semiconductor, represented by Arrow Electronics , has released the LMV1032, a new ultra-thin audio amplifier series for small form-factor electret microphones designed to replace the junction field effect transistor (JFET) preamp currently in use.
The addition of a third pin in electret microphones that incorporate the LMV1032 allows for a dramatic reduction in supply current compared to JFET-equipped electret microphones.
The LMV1032 series is ideal for extended battery life applications, such as digital cameras and MP3 players. Microphone supply current is reduced to 60µA, assuring longer battery life.
The LMV1032 series is guaranteed for supply voltages from 1.7V to 5V and has fixed voltage gains of 6dB, 15dB and 25dB. It also offers low output impedance over the voice bandwidth, excellent power supply rejection (PSRR), and stability over temperature.
The devices are offered in a space-saving 4-bump ultra-thin micro SMD lead- free package.
National also introduced the LMV1012UP, an ultra-thin version of its popular "Amp-in-a-mic" product. The new LMV1012UP is the market's first amplifier in a microphone integrated directly inside 2 and 3-wire electret condenser microphones (ECMs).
These amplifiers replace JFETs for longer battery life and greater noise immunity, resulting in better microphone performance.
These products are ideal for use in microphones in mobile handsets, headset accessories and other portable microphone applications.