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  5. AD7768-4

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Device Drivers
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Overview

Features and Benefits

  • Precision ac and dc performance
  • 8-/4-channel simultaneous sampling
    • 256 kSPS maximum ADC ODR per channel
    • 108 dB dynamic range
    • 110.8 kHz maximum input bandwidth (−3 dB BW)
    • −120 dB THD, typical
    • ±2 ppm of full-scale range (FSR) integral nonlinearity (INL), ±50 μV offset error, ±30 ppm of FSR gain error
  • Optimized power dissipation vs. noise vs. input bandwidth
    • Selectable power, speed, and input bandwidth
      • Fast (highest speed): 110.8 kHz BW, 51.5 mW per channel
      • Median (half speed): 55.4 kHz BW, 27.5 mW per channel
      • Low power (lowest power): 13.8 kHz BW, 9.375 mW per channel
  • Per channel digital filter
  • Programmable input bandwidth/sampling rates
  • CRC error checking on data interface
  • Daisy-chaining
  • Linear phase digital filter
    • Low latency sinc5 filter
    • Wideband brick wall filter: ±0.005 dB ripple to 102.4 kHz
  • Analog input precharge buffers
  • Power supply
    • AVDD1 = 5.0 V, AVDD2 = 2.25 V to 5.0 V
    • IOVDD = 2.5 V to 3.3 V or IOVDD = 1.8 V
  • 64-lead LQFP package, no exposed pad
  • Temperature range: −40°C to +105°C

Product Details

The AD7768/AD7768-4 are 8-channel and 4-channel 24-bit, simultaneous sampling, sigma-delta (Σ-Δ) analog-to-digital converters (ADCs) with power scaling and 110.8 kHz bandwidth. The devices have a Σ-Δ modulator and digital filter per channel, which enables synchronized sampling of ac and dc signals.

The AD7768/AD7768-4 achieve 108 dB dynamic range at a maximum input bandwidth of 110.8 kHz, combined with typical performance of ±2 ppm integral nonlinearity (INL), ±50 μV offset error, and ±30 ppm gain error.

The AD7768/AD7768-4 user can trade off input bandwidth, output data rate, and power dissipation, and select one of three power modes to optimize for noise targets and power consumption. The flexibility of the AD7768/AD7768-4 allows them to become reusable platforms for low power dc and high performance ac measurement modules.

The AD7768/AD7768-4 have three modes: fast mode (256 kSPS maximum, 110.8 kHz input bandwidth, 51.5 mW per channel), median mode (128 kSPS maximum, 55.4 kHz input bandwidth, 27.5 mW per channel) and low power mode (32 kSPS maximum, 13.8 kHz input bandwidth, 9.375 mW per channel).

The AD7768/AD7768-4 offer extensive digital filtering capabilities, such as a wideband, low ±0.005 dB pass-band ripple, antialiasing low-pass filter with sharp roll-off, and 105 dB attenuation at the Nyquist frequency.

Frequency domain measurements can use the wideband linear phase filter. This filter has a flat pass band (±0.005 dB ripple) from dc to 102.4 kHz at 256 kSPS, from dc to 51.2 kHz at 128 kSPS, or from dc to 12.8 kHz at 32 kSPS.

The AD7768/AD7768-4 also offer sinc response via a sinc5 filter, a low latency path for low bandwidth, and low noise measurements. The wideband and sinc5 filters can be selected and run on a per channel basis.

Within these filter options, the user can improve the dynamic range by selecting from decimation rates of ×32, ×64, ×128, ×256, ×512, and ×1024. The ability to vary the decimation filtering optimizes noise performance to the required input bandwidth.

Embedded analog functionality on each ADC channel makes design easier, such as a precharge buffer on each analog input that reduces analog input current and a precharge reference buffer per channel reduces input current and glitches on the reference input terminals.

The device operates with a 5 V AVDD1A and AVDD1B supply, a 2.25 V to 5.0 V AVDD2A and AVDD2B supply, and a 2.5 V to 3.3 V or 1.8 V IOVDD supply (see the 1.8 V IOVDD Operation section for specific requirements for operating at 1.8 V IOVDD).

The device requires an external reference; the absolute input reference voltage range is 1 V to AVDD1 − AVSS.

The specified operating temperature range is −40°C to +105°C. The device is housed in a 10 mm × 10 mm, 64-lead low profile quad flat package (LQFP) with a 12 mm × 12 mm printed circuit board (PCB) footprint.

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 electroencephalogram (EEG)/electromyography (EMG)/electrocardiogram (ECG)

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Evaluation Kits (2)

Documentation & Resources

  • View All (8)
  • Data Sheets (1)
  • Application Notes (1)
  • User Guides (1)
  • Videos (1)
  • Technical Articles (4)
    • Document Type

    Software & Systems Requirements

    Device Drivers

    WIKI

    AD7768 IIO Precision ADC Linux Driver
    WIKI

    AD7768 Bare Metal Resources

    Tools & Simulations

    Precision ADC Driver Tool

    The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input

    Precision ADC Driver Tool

    IBIS Models

    Reference Designs (1)

    Product Recommendations

    AD7768-4 Companion Parts

    Recommended Analog to Digital Converters

    • Recommended 4 channel ADC: AD7768-4.
    • Recommended 16-bit 8-channel ADC: AD7761.
    • Recommended single channel ADC: AD7768-1.

    Recommended Driver Amplifiers

    Recommended Current Source

    Recommended Low Dropout Regulators and Switchers

    Recommended Voltage References

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD7768-4BSTZ Material Declaration Reliability Data 64-Lead LQFP (10mm x 10mm)
    AD7768-4BSTZ-RL Material Declaration Reliability Data 64-Lead LQFP (10mm x 10mm)
    AD7768-4BSTZ-RL7 Material Declaration Reliability Data 64-Lead LQFP (10mm x 10mm)
    Wafer Fabrication Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Select Model for PCN Information
    • AD7768-4BSTZ Production
    • AD7768-4BSTZ-RL Production
    • AD7768-4BSTZ-RL7 Production

    Support & Discussions

    AD7768-4 Discussions

    Multiple AD7768 in sync, will the data interface be synchronous?
    11 week(s) ago in Precision ADCs
    Does the AD7768-4 require a power-up sequence?
    14 week(s) ago in Precision ADCs
    AD7768-4FMCZ evaluation board input Signal Test
    15 week(s) ago in Precision ADCs
    All AD7768-4 Discussions
    AD7768-4 Contact ADI Technical Support »
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