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AD7738 Datasheet(PDF) 1 Page - Analog Devices |
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AD7738 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 28 page  REV. 0 a 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. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 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 © Analog Devices, Inc., 2002 AD7738 8-Channel, High Throughput, 24-Bit - ADC FEATURES High Resolution ADC 24 Bits No Missing Codes 0.0015% Nonlinearity Optimized for Fast Channel Switching 18-Bits p-p Resolution (21 Bits Effective) at 500 Hz 16-Bits p-p Resolution (19 Bits Effective) at 8.5 kHz 15-Bits p-p Resolution (18 Bits Effective) at 15 kHz On-Chip Per Channel System Calibration Configurable Inputs 8 Single-Ended or 4 Fully Differential Input Ranges +625 mV, +1.25 V, +2.5 V, 625 mV, 1.25 V, 2.5 V 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 FUNCTIONAL BLOCK DIAGRAM SCLK DIN DOUT CS RDY RESET SERIAL INTERFACE CONTROL LOGIC AIN4 AIN5 AIN6 AIN7 MUX AINCOM/P0 AIN0 AIN1 AIN2 AIN3 DGND DVDD REFERENCE DETECT REFIN– REFIN+ I/O PORT SYNC/P1 CLOCK GENERATOR MCLKIN MCLKOUT MUXOUT ADCIN AGND AVDD 24-BIT - ADC BUFFER AD7738 CALIBRATION CIRCUITRY GENERAL DESCRIPTION The AD7738 is a high precision, high throughput analog front end. True 16-bit p-p resolution is achievable with a total con- version time of 117 µs (8.5 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 eight single-ended or four fully differential input channels with unipolar or bipolar 625 mV, 1.25 V, and 2.5 V input ranges and accepts a common-mode input voltage from 200 mV above AGND to AVDD – 300 mV. The multiplexer output is pinned out externally, allowing the user to implement programmable gain or signal conditioning before applying the input to the ADC. The differential reference input features “No-Reference” detect capability. The ADC also supports per channel system calibra- tion options. The digital serial interface can be configured for 3-wire opera- tion 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 AD7738 family are the AD7734 and the AD7732. The AD7734 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 AD7734 accepts an analog input overvoltage to ±16.5 V while not degrading the performance of the adjacent channels. The AD7732 is similar to AD7734, but its analog front end features two fully differential input channels. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corporation |
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