Features and Benefits
- High performance 24-bit Σ-Δ ADC
- 115 dB dynamic range at 78.125 kHz output data rate
- 109 dB dynamic range at 312.5 kHz output data rate
- 312.5 kHz maximum fully filtered output word rate
- Pin-selectable oversampling rates of 64×, 128×, and 256×
- Low power mode
- Flexible serial peripheral interface (SPI)
- Fully differential modulator input
- On-chip differential amplifier for signal buffering
- On-chip reference buffer
- Full band, low-pass, finite impulse response (FIR) filter
- Overrange alert pin
- Digital gain correction registers
- Power-down mode
- Synchronization of multiple devices via the SYNC pin
- Daisy chaining
The AD7764 is a high performance, 24-bit, sigma-delta (Σ-Δ) analog-to-digital converter (ADC). It combines wide input bandwidth, high speed, and performance of 109 dB dynamic range at a 312.5 kHz output data rate. With excellent dc specifications, the converter is ideal for high speed data acquisition of ac signals where dc data is also required.
Using the AD7764 eases front-end antialias filtering requirements, simplifying the design process significantly. The AD7764 offers pin-selectable decimation rates of 64×, 128×, and 256×. Other features include an integrated buffer to drive the reference, as well as a fully differential amplifier to buffer and level shift the input to the modulator.
An overrange alert pin indicates when an input signal exceeds the acceptable range. The addition of internal gain and internal overrange registers makes the AD7764 a compact, highly integrated data acquisition device requiring minimal peripheral components.
The AD7764 also offers a low power mode, significantly reducing power dissipation without reducing the output data rate or available input bandwidth.
The differential input is sampled at up to 40 MSPS by an analog modulator. The modulator output is processed by a series of low-pass filters. The external clock frequency applied to the AD7764 determines the sample rate, filter corner frequencies, and output word rate.
The AD7764 device boasts a full band, on-board FIR filter. The full stop-band attenuation of the filter is achieved at the Nyquist frequency. This feature offers increased protection from signals that lie above the Nyquist frequency being aliased back into the input signal bandwidth.
The reference voltage supplied to the AD7764 determines the input range. With a 4 V reference, the analog input range is ±3.2768 V differential, biased around a common mode of 2.048 V. This common-mode biasing is achieved using the on-chip differential amplifier, further reducing the external signal conditioning requirements.
The AD7764 is available in a 28-lead TSSOP package and is specified over the industrial temperature range of −40°C to +85°C.
- Data acquisition systems
- Vibration analysis
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The EVAL-AD7764EDZ / EVAL-AD7765EDZ are fully featured evaluation kits for the AD7764 / AD7765. These boards operate in stand alone mode or in conjunction with the Converter Evaluation and Development board, EVAL-CED1Z . When operated with the Converter Evaluation and Development board, software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation boards in standalone operation or when operated with the Converter Evaluation and Development board.
Please note: This Evaluation software does not run on Windows 8 or Windows 10 (USB driver is non-compliant with OS >Windows 7).
Documentation & Resources
Understanding and Extending Safety Operation in a Sigma-Delta ADC2/1/2017 Analog Dialogue
Designing Power Supplies for High Speed ADC2/1/2012
Software & Systems Requirements
AD7764/AD7765 Evaluation Board Software
Tools & Simulations
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
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|
|AD7764BRUZ||Material Declaration||Reliability Data||28-Lead TSSOP (4.4mm x 9.7mm)|
|AD7764BRUZ-REEL7||Material Declaration||Reliability Data||28-Lead TSSOP (4.4mm x 9.7mm)|
|Wafer Fabrication Data|
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.