Legendsemi LHA7724SEQG

LHA7724 is a 128kSPS, 24-bit ADC. This ADC delivers both excellent dynamic performance and ultra-high DC accuracy.

A dual-channel multiplexer enables selection between external signal measurement and internal ADC test signals. A mode is available to test internal noise by shorting the input circuit.

The fourth-order inherently stable modulator provides excellent low-noise and linearity performance. The modulator output is filtered and decimated by an on-chip digital filter to produce the ADC conversion result. The digital FIR filter provides data rates from 125 to 32kSPS. The SINC filter supports data rates up to 128kSPS. On-chip gain and offset adjustment registers support system calibration. The SYNC input controls the timing of ADC conversions. The power-down input places the ADC into shutdown mode.

The LHA7724 is housed in a compact 24-lead 5mm×4mm QFN package, with a fully rated operating temperature of -40°C to +85°C and a maximum operating temperature range of -50°C to +125°C.

• Maximum sample rate: 128kSPS
• Operating modes — Low power mode: 5.5mW
• 132.9dB SNR (500 SPS) FIR filter
• 100.1dB SNR (64kSPS) SINC filter
• High resolution mode: 9.1mW
• 130.8dB SNR (500 SPS) FIR filter
• 95.5dB SNR (128kSPS) SINC filter
• Other performance:
  • THD: -111dB
  • CMRR: 110dB
  • INL: ±2.5 ppm/FSR
• 2 differential input pairs
• Flexible digital filters:
  • Sinc + FIR (optional)
  • Linear or minimum phase options
• Offset error and gain error calibration
• SYNC input
• Digital supply: 1.8V to 3.3V
• Analog supply: 5V or ±2.5V

• Vibration analysis
• Acoustics
• Dynamic stress change meter
• High-precision instruments