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LHA7879-2

The LHA7879-2 is a dual-channel, simultaneous-sampling 24-bit delta-sigma (ΔΣ) analog-to-digital converter (ADC). It features wide dynamic range, low power consumption and dedicated energy-measurement functions, making it ideal for energy metering, power measurement and circuit breaker equipment. The ADC inputs can be directly interfaced to resistor divider networks or power transformers for voltage measurement, or to current transformers, shunt resistors or Rogowski coils for current measurement. Each independent ADC channel can be separately configured according to the connected sensor input. A low-noise programmable gain amplifier (PGA) provides gain options from 1 to 128 for amplifying low-level weak signals. Furthermore, the device integrates inter-channel phase calibration, offset calibration and gain calibration registers to eliminate errors introduced by the signal chain. This chip integrates a low-drift 1.2 V internal reference to reduce PCB footprint, and also supports external reference input mode. Optional cyclic redundancy check (CRC) on data input, data output and register map ensures reliable communication data integrity. This fully integrated analog front-end (AFE) is available in 20-pin TSSOP and leadless 20-pin WQFN packages, with specified industrial operating temperature range of −40 ℃ to +125 ℃.
Data Sheet
User Manual
Application Note
Development Board Information
LHA7879-2

Product Features

• 2 simultaneously sampling differential input channels

• Programmable data rate up to 64 kSPS

• Programmable gain up to 128

• Noise performance:

— Dynamic range of 107 dB at gain = 1, 4 kSPS output rate

• Total harmonic distortion (THD): −100 dB

• High-impedance inputs for direct sensor connection:

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

• Current monitoring mode enables ultra-low-power tamper detection

• Integrated negative charge pump allows input signals below ground potential

• Channel-to-channel crosstalk: −120 dB

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

• External reference input mode supported

• Cyclic redundancy check (CRC) for communication and register map

• Analog & digital supply voltage: 2.7 V ~ 3.6 V

• Low power consumption: 2.1 mW with AVDD & DVDD supplied at 3 V

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

• Operating temperature range: −40 ℃ ~ +125 ℃

Application Scenario

• Electricity meters: commercial and residential

• Circuit breakers

• Protection relays

• Power quality meters

• Battery test equipment

• Battery management systems（BMS）

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legendsemi

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