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LHA5274

The LHA5274 (quad) and LHA5278 (octal) are 24-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with data rates up to 256k samples per second (SPS), allowing simultaneous sampling of four or eight channels. The devices are offered in identical packages, permitting drop in expandability. The LHA5274 and LHA5278 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 110.8kHz for 256kSPS. Four operating modes allow for optimization of speed, resolution, and power. All operations are controlled directly by pins; there are no registers to program. The devices are fully specified over the extended industrial range (–40°C to +125°C) and are available in an LQFP-64 package.
Data Sheet
User Manual
Application Note
Development Board Information
LHA5274

Product Features

 

• Simultaneously Measure Four/Eight Channels

• Up to 256kSPS Data Rate

• AC Performance: 110.8kHz Bandwidth

114dB SNR (HR Mode, VREF=4.096V)

–115dB THD

• DC Accuracy:

0.25μV/°C Offset Drift

1ppm/°C Gain Drift

2ppm/FSR INL

• Selectable Operating Modes (VREF=4.096V):

Ultra-Speed: 256kSPS, 23mW/ch

High-Speed: 128kSPS, 111dB SNR

High-Resolution: 64kSPS, 114dB SNR

Low-Power: 64kSPS, 12mW/ch

• Linear Phase Digital 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

Application Scenario

• Process control

• Vibration/Modal Analysis

• Multi-Channel Data Acquisition

• Acoustics/Dynamic Strain Gauges

• Pressure Sensors

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