LMV1026

LMV1024/LMV1026 PDM Output with Pre-Amplifier for Electret Microphones November 2005 LMV1024/LMV1026 (Stereo) PDM Output with Pre-Amplifier for Electret Microphones General Description National’s LMV1024 and LMV1026 stereo amplifiers are solutions for the new generation of voice enrichment capabilities. National has integrated sigma delta modulation and analog cores to improve the voice quality and the performance and to support designer’s choices. Each 20 kHz preamplifier drives a Pulse Density Modulated (PDM) signal at an over sampled 60 bit stream, offering www.DataSheet4U.com versatility. These solutions provide immediate conversion to high performance audio spectrum, thus completing a high quality audio system. The LMV1024 and LMV1026 operate from 1.6V to 3V. National’s new adjustable clock frequency technology is designed for stereo, performance and ease of use. The stereo function is either a rising or falling edge clock command. The high drive, robust PDM signal directly from an ECM (Electret Condenser Microphone), upgrades existing lower quality, low-level signal constraints. These advanced mixed signal preamplifiers cleanly, accurately and creatively eliminate older, poorer quality systems, which restricted performance and versatility. The 4-wire PDM signaling reduces RF noise and simplifies layout. Using National’s PDM solutions is the choice for higher quality mono or stereo and multi-array applications. National’s 518uA circuits deliver stereo portability with ...