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LHA8950C

The LHA8950 is an 18-bit successive approximation register (SAR) analog-to-digital converter powered by a single VDD supply rail. It integrates a low-power high-speed 18-bit sampling ADC and a multi-function serial interface port. On the rising edge of the CNV conversion trigger signal, the LHA8950 samples the differential voltage between IN+ and IN− pins; the voltage on IN+ swings from 0 V to VREF, while IN− is tied to ground. The reference voltage (REF) is supplied externally and can operate independently of the main VDD supply. The device power consumption varies linearly with sampling throughput. The SPI-compatible serial interface allows multiple ADC chips to be daisy-chained onto a single 3-wire SPI bus via the SDI input pin, with an optional conversion busy status indicator. A separate VIO I/O supply rail enables native compatibility with 1.8 V, 2.5 V, 3 V and 5 V microcontroller logic voltages. The LHA8950 is available in 10-lead MSOP and compact 10-lead 3 mm × 3 mm QFN packages, specified over the industrial temperature range of −40°C to +125°C.
Data Sheet
User Manual
Application Note
Development Board Information
LHA8950C

Product Features

• 18-bit resolution with no missing codes

• Throughput rate options:

   - LHA8950F: 1 MSPS

   - LHA8950C: 500 kSPS

• Ultra-low power consumption

   - 3.6 mW at 1 MSPS (analog VDD supply only)

   - Total power dissipation: 7 mW at 1 MSPS

   - 70 μW power draw at 10 kSPS

• Integral Non-Linearity (INL): ±0.7 LSB

• Dynamic range: 92 dB

• Signal-to-Noise Ratio (SNR): 91.8 dB

• Total Harmonic Distortion (THD): −112 dB

• Single-ended analog input range: 0 V to VREF

• Zero pipeline latency / conversion delay

• Single 1.8 V core supply; SPI I/O compatible with 1.8 V / 2.5 V / 3 V / 5 V logic levels

• Daisy-chain architecture for multi-ADC stacking, with optional conversion busy flag output

• Packages: 10-lead MSOP, 3 mm × 3 mm QFN

Application Scenario

• Battery-powered portable devices

• General data acquisition systems

• Medical instrumentation

• Seismic signal acquisition equipment

legendsemi
legendsemi

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