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AD7760BCP Datasheet(PDF) 1 Page - Analog Devices |
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AD7760BCP Datasheet(HTML) 1 Page - Analog Devices |
1 / 22 page 2.5 MSPS, 20-Bit Σ∆ ADC Preliminary Technical Data AD7760 Rev. PrN Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES High performance 20-bit Sigma-Delta ADC 118dB SNR at 78kHz output data rate 100dB SNR at 2.5MHz output data rate 2.5 MHz maximum fully filtered output word rate Programmable over-sampling rate (8x to 256x) Flexible parallel interface Fully differential modulator input On-chip differential amplifier for signal buffering Low pass FIR filter with default or user programmable coefficients Over-range alert bit Digital offset and gain correction registers Filter bypass modes Low power and power down modes Synchronization of multiple devices via SYNC pin APPLICATIONS Data acquisition systems Vibration analysis Instrumentation FUNCTIONAL BLOCK DIAGRAM DIFF Multi-Bit Sigma-Delta Modulator AD7760 Control Logic, I/O and Registers Reconstruction Programmable Decimation FIR Filter Engine DB0 - DB15 VIN+ VIN- AVDD1 AGND VREF+ MCLK DGND BUF VDRIVE MCLK SYNC RESET AVDD2 AVDD3 AVDD4 DVDD - + DECAP RBIAS Figure 1. PRODUCT OVERVIEW The AD7760 high performance 20-bit sigma delta analog to digital converter combines wide input bandwidth and high speed with the benefits of sigma delta conversion with performance of 100dB SNR at 2.5MSPS making it ideal for high speed data acquisition. Wide dynamic range combined with significantly reduced anti-aliasing requirements simplify the design process. An integrated buffer to drive the reference, a differential amplifier for signal buffering and level shifting, an over-range flag, internal gain & offset registers and a low-pass digital FIR filter make the AD7760 a compact highly integrated data acquisition device requiring minimal peripheral component selection. In addition the device offers programmable decimation rates and the digital FIR filter can be adjusted if the default characteristics are not appropriate to the application. The AD7760 is ideal for applications demanding high SNR without necessitating design of complex front end signal processing. The differential input is sampled at up to 40MS/s by an analog modulator. The modulator output is processed by a series of low-pass filters, the final one having default or user programmable coefficients. The sample rate, filter corner frequencies and output word rate are set by a combination of the external clock frequency and the configuration registers of the AD7760. The reference voltage supplied to the AD7760 determines the analog input range. With a 4V reference, the analog input range is ±3.2V differential biased around a common mode of 2V. This common mode biasing can be achieved using the on-chip differential amplifiers, further reducing the external signal conditioning requirements. The AD7760 is available in an exposed paddle 64-lead TQFP and 48-lead CSP packages and is specified over the industrial temperature range from -40°C to +85°C. |
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