Analog Devices Inc. AD7768 24-Bit ADCs
Analog Devices AD7768 8-/4-Channel, 24-bit sigma-delta (Σ-Δ) ADCs include an sigma-delta 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-/4-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
- Selectable power, speed, and input bandwidth
- 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°C
Applications
- 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
Block Diagram
Additional Resources
- Understanding and Extending Safety Operation in a Sigma-Delta ADC
- Application Note
- How High Performance Modular Instruments Enable Greater Applications and Smaller Form Factor
- No Infidelity: Audio Test Platforms Benefit from New 24-Bit, Sigma-Delta ADC’s Superior SINAD
- Article - Maximize the Performance of Your Sigma-Delta ADC Driver
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Development Tools
Analog Devices Inc. EVAL-AD7768FMCZ Evaluation Board
Evaluation board for the AD7768 24-bit, 8-channel, 256kSPS, Sigma-Delta ADCs with power scaling.
Analog Devices Inc. EV-AD7768-1FMCZ Eval Board for AD7768 24-Bit ADC
Full-featured evaluation board for the AD7768-1 8-channel Sigma-Delta ADCs with power scaling.
Analog Devices Inc. EVAL-AD7768-4FMCZ Board for the 24 bit AD7768 ADC
Full-featured evaluation board for the AD7768-4 8-channel Sigma-Delta ADCs with power scaling.
Analog Devices Inc. EVAL-SDP-CH1Z High-Speed Controller Board
High-speed controller board for the Analog Devices System Demonstration Platform (SDP).
Analog Devices Inc. IEPE Data Acquisition Board (EVAL-CN0540-ARDZ)
Data Acquisition (DAQ) system designed demonstrate vibration sensing for condition-based monitoring.
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