Legendsemi LHA5114SGQL

LHA5114 is a low-power, low-noise, 24-bit, Σ-Δ ADC with an integrated analog front end, supporting 8 fully differential or 16 single-ended, high-impedance (≥1 MΩ), bipolar, ±10 V voltage inputs. The device integrates key analog and digital signal conditioning modules, enabling eight independent configurations for each analog input channel in use. At full data settling, the LHA5114 achieves a maximum channel scan rate of 6.21 kSPS (161 μs). The built-in 2.5 V, low-drift (±3 ppm/°C) bandgap internal voltage reference (with output reference buffer) reduces external component count. The digital filter supports flexible configurations, including simultaneous 50 Hz and 60 Hz rejection at an output data rate of 27.27 SPS. Users can select different filter settings for each channel based on application requirements. An automatic channel sequencer enables the ADC to cycle through enabled channels. The LHA5114 operates from a single supply, facilitating use in galvanically isolated applications. The specified operating temperature range is −40°C to +105°C. The LHA5114 is available in a 40-pin, 6 mm × 6 mm QFN package.

• 24-bit ADC with integrated analog front end
• Fast, flexible output data rate: 1.25 SPS to 31.25 kSPS
• Channel scan data rate of 6.21 kSPS per channel (161 μs settling time)
• 17.3-bit noise-free resolution at 1007 SPS per channel
• 120 dB rejection of 50 Hz and 60 Hz common-mode interference at 20 SPS per channel
• ±10 V input, supports 8 differential or 16 single-ended configurations
• VIN pin absolute maximum rating: ±65 V
• Input pin absolute voltage up to ±20 V
• Minimum 1 MΩ input impedance
• Total unadjusted error of 0.07% at 25°C
• On-chip 2.5 V voltage reference
• Initial accuracy of ±0.12% at 25°C, typical drift of ±3 ppm/°C
• Internal or external clock support
• Supply voltage: AVDD = 3.0 V to 5.5 V; IOVDD = 2 V to 5.5 V
• Total current consumption (AVDD + IOVDD): 2.9 mA
• Operating temperature range: -40°C to +105°C
• 3-wire or 4-wire serial digital interface (SCLK with Schmitt trigger)
• Compatible with SPI, QSPI, MICROWIRE, and DSP

• Process Control
• Programmable Logic Controller and Distributed Control System Modules
• Instrumentation & Measurement