Analog Devices AD7768 24-Bit ADCs

Analog Devices AD7768 24-bit sigma-delta (Σ-Δ) ADCs include an Σ-Δ modulator and digital filter per channel to provide synchronized sampling of ac and dc signals. AD7768 ADCs offer a maximum 256kSPS ADC output data rate per channel. The AD7768 ADCs achieve a 108dB dynamic range up to a 110.8kHz input bandwidth. Typical performance ratings include ±2ppm integral nonlinearity (INL), ±50µV offset error, ±30ppm gain error, and −120dB total harmonic distortion (THD). 

Designers can choose from AD7768's fast, median, and eco power modes to optimize noise performance and power consumption. With an option of three power modes, the AD7768 ADCs provide a reusable platform for low power dc and high performance ac measurement modules. 

The AD7768 ADCs also offer extensive digital filtering capabilities, sinc response via a sinc5 filter, a low latency path for low bandwidth, and low-noise measurements.

Features

• Precision ac and dc performance
• 8-channel simultaneous sampling
  • 256kSPS ADC output data rate per channel
  • 108dB dynamic range
  • 110.8kHz input bandwidth (BW) (−3dB bandwidth)
  • −120dB Total Harmonic Distortion (THD) typical
  • ±2ppm full-scale range (FSR) integral nonlinearity (INL), ±50μV offset error, ±30ppm gain error
• Optimized power dissipation vs. noise vs. input bandwidth
  • Selectable power, speed, and input bandwidth
    • Fast: highest speed; 110.8kHz BW, 51.5mW per channel
    • Median: half speed, 55.4kHz BW, 27.5mW per channel
    • Eco: lowest power, 13.8kHz BW, 9.375mW per channel
• Input Bandwidth range: dc to 110.8kHz
• Programmable input bandwidth/sampling rates
• Cyclic redundancy check (CRC) error checking on data interface
• Daisy-chaining
• Linear phase digital filter
  • Low latency sinc5 filter
  • Wideband brick wall filter: ±0.005dB ripple to 102.4kHz
• Analog input precharge buffers
• Power supply
  • AVDD1 = 5V, AVDD2 = 2.25V to 5V
  • IOVDD = 2.5V to 3.3V or IOVDD = 1.8V
• 64-lead LQFP package, no pad
• Temperature range: −40°C to +105°CApplications
  • Data acquisition systems: USB/PXI/Ethernet
  • Instrumentation and industrial control loops
  • Audio test and measurement
  • Vibration and asset condition monitoring
  • 3-phase power quality analysis
  • Sonar
  • High precision medical EEG/EMG/ECG
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