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AD7763 Datasheet(PDF) 1 Page - Analog Devices |
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AD7763 Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page 24-Bit, 625 kSPS, 109 dB Σ-Δ ADC with On-Chip Buffers, Serial Interface AD7763 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES 120 dB dynamic range at 78 kHz output data rate 109 dB dynamic range at 625 kHz output data rate 112 dB SNR at 78 kHz output data rate 107 dB SNR at 625 kHz output data rate 625 kHz maximum fully filtered output word rate Programmable oversampling rate (32× to 256×) Flexible serial interface Fully differential modulator input On-chip differential amplifier for signal buffering Low-pass finite impulse response (FIR) filter with default or user-programmable coefficients Overrange alert bit Digital offset and gain correction registers Low power and power-down modes Synchronization of multiple devices via SYNC pin I2S interface mode APPLICATIONS Data acquisition systems Vibration analysis Instrumentation FUNCTIONAL BLOCK DIAGRAM AD7763 VIN+ VIN– AVDD1 AGND MCLK DGND VDRIVE AVDD2 AVDD3 AVDD4 DVDD DECAPA RBIAS DECAPB MCLKGND SYNC RESET SH2:0 ADR2:0 CDIV CONTROL LOGIC I/O OFFSET AND GAIN REGISTERS DIFF MULTIBIT Σ-Δ MODULATOR RECONSTRUCTION VREF+ REFGND FIR FILTER ENGINE PROGRAMMABLE DECIMATION BUF Figure 1. GENERAL DESCRIPTION The AD7763 high performance, 24-bit, Σ-Δ analog-to-digital converter (ADC) combines wide input bandwidth and high speed with the benefits of Σ-Δ conversion, as well as performance of 107 dB SNR at 625 kSPS, making it ideal for high speed data acquisition. A wide dynamic range, combined with significantly reduced antialiasing requirements, simplifies the design process. An integrated buffer to drive the reference, a differential ampli- fier for signal buffering and level shifting, an overrange flag, internal gain and offset registers, and a low-pass, digital FIR filter make the AD7763 a compact, highly integrated data acquisition device requiring minimal peripheral component selection. In addition, the device offers programmable decimation rates and a digital FIR filter, which can be user- programmed to ensure that its characteristics are tailored for the user’s application. The AD7763 is ideal for applications demanding high SNR without necessitating the design of complex, front- end signal processing. 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 final filter 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 AD7763. The reference voltage supplied to the AD7763 determines the analog input range. With a 4 V reference, the analog input range is ±3.2 V differential-biased around a common mode of 2 V. This common-mode biasing can be achieved using the on-chip differential amplifiers, further reducing the external signal conditioning requirements. The AD7763 is available in an exposed paddle, 64-lead TQFP_EP and is specified over the industrial temperature range from −40°C to +85°C. Table 1. Related Devices Part No. Description AD7760 24-bit, 2.5 MSPS, 100 dB Σ-Δ, parallel interface AD7762 24-bit, 625 kSPS, 109 dB Σ-Δ, parallel interface |
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