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LHA5114

The LHA5114 is a low power, low noise, 24-bit, sigma-delta (Σ-Δ) analog-to-digital converter (ADC) that integrates an analog front end (AFE) for eight fully differential or 16 single-ended, high impedance (≥1 MΩ), bipolar, ±10 V voltage inputs. The LHA5114 integrates key analog and digital signal conditioning blocks to configure eight individual setups for each analog input channel in use. The LHA5114 features a maximum channel scan rate of 6.21 kSPS for fully settled data. The embedded 2.5 V, low drift (±3 ppm/°C), band gap internal reference (with output reference buffer) reduces the external component count. The digital filter allows flexible settings, including simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. The user can select different filter settings depending on the requirements of each channel in the application. The automatic channel sequencer enables the ADC to switch through each enabled channel. The LHA5114 operates with a single power supply that allows simplified use in galvanically isolated applications. The specified operating temperature range is −40°C to +105°C. The LHA5114 is housed in a 40-lead, 6 mm × 6 mm QFN.
Data Sheet
User Manual
Application Note
Development Board Information
LHA5114

Product Features

• 24-bit ADC with integrated AFE

• Fast and flexible output rate: 1.25 SPS to 31.25 kSPS

• Channel scan data rate of 6.21 kSPS per channel (161 μs settling)

• 17.3 noise free bits at 1007 SPS per channel

• 120 dB common mode rejection of 50 Hz and 60 Hz at 20 SPS per channel

• ±10 V inputs, either 8 differential or 16 single-ended

  - VIN pin absolute maximum rating: ±65 V

  - Absolute input pin voltage up to ±20 V operating

  - Minimum 1 MΩ input impedance

  - 0.07% TUE at 25°C

• On-chip 2.5 V reference

  - ±0.12% initial accuracy at 25°C, ±3 ppm/°C (typical) drift

• Internal or external clock

• Power supplies

  - AVDD = 3.0 V to 5.5 V

  - IOVDD = 2 V to 5.5 V

  - Total current consumption AVDD + IOVDD (IDD) = 2.9 mA

• Temperature range: −40°C to +105°C

• 3-wire or 4-wire serial digital interface (Schmitt trigger on SCLK)

  - SPI, QSPI, MICROWIRE, and DSP compatible

Application Scenario

• Process control

  - Programmable logic controller (PLC) and distributed control system (DCS) modules

  - Instrumentation and measurement

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legendsemi

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