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AD7765BRUZ-REEL7 Datenblatt(PDF) 1 Page - Analog Devices |
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AD7765BRUZ-REEL7 Datenblatt(HTML) 1 Page - Analog Devices |
1 / 32 page 24-Bit, 156 kSPS, 112 dB Σ-Δ ADC with On-Chip Buffers and Serial Interface AD7765 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 ©2007 Analog Devices, Inc. All rights reserved. FEATURES High performance 24-bit ∑-∆ ADC 115 dB dynamic range at 78 kHz output data rate 112 dB dynamic range at 156 kHz output data rate 156 kHz maximum fully filtered output word rate Pin-selectable oversampling rate (128× and 256×) Low power mode Flexible 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 SYNC pin Daisy chaining APPLICATIONS Data acquisition systems Vibration analysis Instrumentation GENERAL DESCRIPTION The AD7765 is a high performance, 24-bit Σ-Δ analog-to-digital converter (ADC). It combines wide input bandwidth, high speed, and performance of 112 dB dynamic range at a 156 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 AD7765 eases the front-end antialias filtering requirements, simplifying the design process significantly. The AD7765 offers pin-selectable decimation rates of 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 has exceeded the acceptable range. The addition of internal gain and internal overrange registers make the AD7765 a compact, highly integrated data acquisition device requiring minimal peripheral components. The AD7765 also offers a low power mode, significantly reducing power dissipation without reducing the output data rate or available input bandwidth. FUNCTIONAL BLOCK DIAGRAM REFGND VREF+ BUF VOUTA– VOUTA+ VIN+ VIN– MCLK GND OVERRANGE DEC_RATE AVDD1 AVDD2 AVDD3 AVDD4 DVDD RBIAS SYNC RESET/PWRDWN VINA+ VINA– FSO SCO SDI SDO FSI DIFF MULTIBIT Σ-Δ MODULATOR RECONSTRUCTION DECIMATION FIR FILTER ENGINE AD7765 INTERFACE LOGIC AND OFFSET AND GAIN CORRECTION REGISTERS Figure 1. 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 AD7765 determines the sample rate, filter corner frequencies, and output word rate. The AD7765 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 AD7765 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 can be achieved using the on-chip differential amplifier, further reducing the external signal conditioning requirements. The AD7765 is available in a 28-lead TSSOP package and is specified over the industrial temperature range from −40°C to +85°C. Table 1. Related Devices Part No. Description AD7760 2.5 MSPS, 100 dB, parallel output on-chip buffers AD7762 625 kSPS, 109 dB, parallel output on-chip buffers AD7763 625 kSPS, 109 dB, serial output, on-chip buffers AD7764 312 kSPS, 109 dB, serial output, on-chip buffers AD7766 125 kSPS, 108 dB, serial output, 20 mW max power AD7767 125 kSPS, 108 dB, serial output, 20 mW max power |
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