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LHA7879-4

The LHA7879-4 is a four-channel, simultaneously sampling, 24-bit, delta-sigma (ΔΣ), analog-to-digital converter (ADC) that offers wide dynamic range, low power, and energy-measurement-specific features, making the device an excellent fit for energy metering, power metrology, and circuit breaker applications. The ADC inputs can be directly interfaced to a resistor divider network or a power transformer to measure voltage or to a current transformer, shunt, or a Rogowski coil to measure current. The individual ADC channels can be independently configured depending on the sensor input. A low noise, programmable gain amplifier (PGA) provides gains ranging from 1 to 128 to amplify low-level signals. Additionally, this device integrates channel-to-channel phase calibration and offset and gain calibration registers to help remove signal-chain errors. A low-drift, 1.2-V reference is integrated into the device reducing printed circuit board (PCB) area. Optional cyclic redundancy checks (CRCs) on the data input, data output, and register map maintain communication integrity. The complete analog front-end (AFE) is offered in a 20-pin TSSOP package or a leadless 20-pin QFN package and is specified over the industrial temperature range of −40°C to +125°C.
Data Sheet
User Manual
Application Note
Development Board Information
LHA7879-4

Product Features

• 4 simultaneously sampling differential inputs

• Programmable data rate up to 64 kSPS

• Programmable gain up to 128

• Noise performance:

— -107-dB dynamic range at gain = 1, 4 kSPS

• Total harmonic distortion: −100 dB

• High-impedance inputs for direct sensor connection:

— Input impedance 380-kΩ for gains of 1, 2, 4, 8, 16, 32, 64, and 128

• Current-detect mode allows for extremely low power tamper detection

• Integrated negative charge pump allows input signals below ground

• Crosstalk between channels: −120 dB

• Low-drift internal voltage reference: max 20ppm/°C

• Cyclic redundancy check (CRC) on communications and register map

• 2.7-V to 3.6-V analog and digital supplies

• Low power consumption: 3.1 mW at 3-V AVDD and DVDD

• Packages: 20-pin TSSOP or 20-pin QFN

• Operating temperature range: −40°C to +125°C

Application Scenario

• Electricity meters: commercial and residential

• Circuit breakers

• Protection relays

• Power quality meters

• Battery test equipment

• Battery management systems

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