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LHA8949-18

The LHA8949-18 is an 8-channel, 18-bit charge-redistribution successive approximation register (SAR) analog-to-digital converter powered by a single VDD analog supply. It integrates all building blocks for multi-channel low-power data acquisition, including a no-missing-code 18-bit SAR ADC, an 8-channel low-noise analog multiplexer configurable for single-ended (ground-referenced / non-ground-referenced), differential or pseudo-bipolar inputs, an internal low-drift 2.5 V / 4.096 V voltage reference with output buffer, an on-chip temperature sensor, an optional single-stage digital filter, and a hardware automatic channel scanning sequencer. A simple SPI serial interface is used to write configuration registers and read conversion results. The SPI interface operates from an independent VIO supply rail to match host microcontroller I/O voltage levels. Device power consumption varies linearly with throughput rate. The LHA8949-18 is supplied in a compact 20-lead 4 mm × 4 mm QFN package, fully characterized over the industrial temperature range of −40 ℃ to +125 ℃.
Data Sheet
User Manual
Application Note
Development Board Information
LHA8949-18

Product Features

• 18-bit resolution with no missing codes; integrated 8-channel analog multiplexer with configurable input modes

  −Unipolar single-ended input

  −Differential input (ground-referenced)

  −Pseudo-bipolar input

• Throughput rate: 250 kSPS

• Integral Non-Linearity (INL): ±1.5 LSB typical

• Dynamic range: 93 dB

• SINAD: 92 dB @ 1 kHz input signal

• Total Harmonic Distortion (THD): −110 dB @ 1 kHz input signal

• Analog input range: 0 V to VREF, VREF can reach up to VDD

• Multiple reference voltage configurations

  −On-chip low-drift reference: 4.096 V or 2.5 V

  −External buffered mode: REFIN pin max 4.096 V

  −External reference input: REF pin max VDD

• Integrated on-chip temperature sensor

• Hardware channel sequencer, single-stage filter optional; zero pipeline latency for SAR architecture

• Conversion busy flag output

• Single analog supply: 2.7 V to 5.5 V; digital I/O logic compatible with 1.8 V to 5.5 V

• Serial interface compatible with SPI, QSPI and DSPs

• Power consumption: 11.5 mW at full 250 kSPS throughput

• Standby supply current: 300 nA

• Package: 20-lead 4 mm × 4 mm QFN

Application Scenario

• Battery-powered portable equipment, medical instruments: ECG/EKG

• Mobile communication, GPS devices

• PDAs, power line monitoring, general data acquisition

• Seismic data acquisition systems, industrial instrumentation

• Industrial process control

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legendsemi

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