LHA5278H
The LHA5274H (quad) and LHA5278H (octal) are 24-bit, ΔΣ ADCs, with data rates up to 512k samples per second (SPS), allowing simultaneous sampling of four or eight channels. The devices are offered in identical packages, permitting drop in expandability.
The LHA5274H and LHA5278H allow high-precision industrial measurement with excellent dc and ac specifications, meanwhile achieving very low power – only 23mW/ch at 256kSPS. The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. The bandwidth is up to 221.6kHz for 512kSPS. The LHA5274H and LHA5278H integrate input pre-charge and reference pre-charge buffer that relaxes drive strength requirement on input and reference.
Different operating modes allow for optimization of speed, resolution, and power. The LHA5274H and LHA5278H can be programmed by pin connections, eliminating the need for configuration software, or be programmed by a dedicated SPI port. The devices are fully specified over the extended industrial range (−40°C to +125°C) and are available in LQFP-64 and QFN-56 package.
Product Features
- Simultaneously Measure Four/Eight Channels
- FIR filter up to 512kSPS Data Rate
- SINC filter up to 1.024MSPS Data Rate
- AC Performance: 512kSPS, 103.2dB SNR 256kSPS, 108.6dB SNR 128kSPS, 111.7dB SNR −115dB THD
- DC Accuracy: 0.25μV/℃ Offset Drift 0.5ppm/℃ Gain Drift 2ppm/FSR INL
- Low power and high performance: 23mW/CH @ 256kSPS, 108.6dB SNR
- Easy drive: Integrated Input pre-charge and Ref pre-charge buffers
- Linear Phase Digital Filter and SINC filter
- SPI™ or Frame-Sync Serial Interface
- Low Sampling Aperture Error
- Analog Supply: 5V or ±2.5V
- Digital Core: 1.8V
- I/O Supply: 1.8V to 3.3V
- Pin or SPI Programmable
Application Scenario
- Process control
- Vibration/Modal Analysis
- Multi-Channel Data Acquisition
- Acoustics/Dynamic Strain Gauges
- Pressure Sensors
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