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AD7734 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7734 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 32 page 4-Channel, ±10 V Input Range, High Throughput, 24-Bit ∑-∆ ADC AD7734 FEATURES High resolution ADC 24 bits no missing codes ±0.0025% nonlinearity Optimized for fast channel switching 18-bit p-p resolution (21 bits effective) at 500 Hz 16-bit p-p resolution (19 bits effective) at 2 kHz 14-bit p-p resolution (18 bits effective) at 15 kHz On-chip per channel system calibration 4 single-ended analog inputs Input ranges +5 V, ±5 V, +10 V, ±10 V Overvoltage tolerant Up to ±16.5 V not affecting adjacent channel Up to ±50 V absolute maximum 3-wire serial interface SPI™, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on logic inputs Single-supply operation 5 V analog supply 3 V or 5 V digital supply Package: 28-lead TSSOP APPLICATIONS PLCs/DCS Multiplexing applications Process control Industrial instrumentation GENERAL DESCRIPTION The AD7734 is a high precision, high throughput analog front end. True 16-bit p-p resolution is achievable with a total conversion time of 500 µs (2 kHz channel switching), making it ideally suitable for high resolution multiplexing applications. The part can be configured via a simple digital interface, which allows users to balance the noise performance against data throughput up to a 15.4 kHz. The analog front end features four single-ended input channels with unipolar or true bipolar input ranges to ±10 V while operating from a single +5 V analog supply. The part has an overrange and underrange detection capability and accepts an analog input overvoltage to ±16.5 V without degrading the performance of the adjacent channels. FUNCTIONAL BLOCK DIAGRAM P0 SYNC/P1 AIN0 AIN2 AIN1 AIN3 BIASHI BIASLO SCLK DIN DOUT CS RESET RDY DGND MCLKIN MCLKOUT AGND AVDD DVDD BUFFER REFERENCE DETECT REFIN(–) REFIN(+) AD7734 24-BIT Σ−∆ ADC SERIAL INTERFACE CONTROL LOGIC CLOCK GENERATOR CALIBRATION CIRCUITRY I/O PORT MUX Figure 1. The differential reference input features “No-Reference” detect capability. The ADC also supports per channel system calibration options. The digital serial interface can be configured for 3-wire operation and is compatible with microcontrollers and digital signal processors. All interface inputs are Schmitt triggered. The part is specified for operation over the extended industrial temperature range of –40°C to +105°C. Other parts in the AD7734 family are the AD7732 and the AD7738. The AD7732 is similar to AD7734, but its analog front end features two fully differential input channels. The AD7738 analog front end is configurable for four fully differential or eight single-ended input channels, features 0.625 V to 2.5 V bipolar/unipolar input ranges, and accepts a common-mode input voltage from 200 mV to AVDD–300 mV. The AD7738 multiplexer output is pinned out externally, allowing the user to implement programmable gain or signal conditioning before being applied to the ADC. Rev. 0 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 companies. 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 © 2003 Analog Devices, Inc. All rights reserved. |
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