LMV1026

OBSOLETE LMV1024, LMV1026 www.ti.com SNAS295B – MARCH 2005 – REVISED JULY 2009 LMV1024/LMV1026 (Stereo) PDM Output with Pre-Amplifier for Electret Microphones Check for Samples: LMV1024, LMV1026 FEATURES 1 2 (Typical VDD = 1.8V, CLOCK = 1.2 MHz, fINPUT = 1 kHz, VINPUT = 18 mVPP, unless otherwise specified) Enhanced high-performance, full PDM output from the element Stereo chipset and array routing SNR A-weighted 59 dB Digital A-weighted noise floor −89 dBFS Supply current 518 µA Clock frequency 400 kHz to 2.4 MHz Total harmonic distortion 0.03% Power supply rejection ratio 100 dB Adhesion technology >1 kg Highly integrated stereo or mono signaling Maximized system performance Reduced components and layout RF (buzz noise) managed with 4 wire signaling Thinnest 0.35 mm micro SMD packaging APPLICATIONS Digital output audio subsystems and stereo arrays Electret condenser microphones with all digital output Portable communications and small form factor Digital audio computing or voice security Automotive or array systems Headphone and Headset accessories 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, o...