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Features
(Typical VDD = 1.8V, CLOCK = 1.2 MHz, fINPUT = 1 kHz, VINPUT = 18 mVPP, unless otherwise specified)
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Enhanced high-performance, full PDM output from the element
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Stereo chipset and array routing
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SNR A-weighted
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59 dB
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Digital A-weighted noise floor
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−89 dBFS
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Supply current
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518 µA
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Clock frequency
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400 kHz to 2.4 MHz
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Total harmonic distortion
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0.03%
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Power supply rejection ratio
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100 dB
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Adhesion technology >1 kg
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Highly integrated stereo or mono signaling
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Maximized system performance
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Reduced components and layout
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RF (buzz noise) managed with 4 wire signaling
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Thinnest 0.35 mm micro SMD packaging
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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 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 audio quality bandwidth. These solutions enable rapid system evaluation
and enhance consumer satisfaction. National provides the LMV1024 and LMV1026 in 6-bump micro SMD packages with 1 kg adhesion
properties.
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
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