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部品型式

AD7718BR

製品説明
仕様・特性

a 8-/10-Channel, Low Voltage, Low Power, ⌺-⌬ ADCs AD7708/AD7718 GENERAL DESCRIPTION FEATURES 8-/10-Channel, High Resolution ⌺-⌬ ADCs AD7708 Has 16-Bit Resolution AD7718 Has 24-Bit Resolution Factory-Calibrated Single Conversion Cycle Setting Programmable Gain Front End Simultaneous 50 Hz and 60 Hz Rejection VREF Select™ Allows Absolute and Ratiometric Measurement Capability Operation Can Be Optimized for Analog Performance (CHOP = 0) or Channel Throughput (CHOP = 1) The AD7708/AD7718 are complete analog front-ends for low frequency measurement applications. The AD7718 contains a 24-bit Σ-∆ ADC with PGA and can be configured as 4/5 fullydifferential input channels or 8/10 pseudo-differential input channels. Two pins on the device are configurable as analog inputs or reference inputs. The AD7708 is a 16-bit version of the AD7718. Input signal ranges from 20 mV to 2.56 V can be directly converted using these ADCs. Signals can be converted directly from a transducer without the need for signal conditioning. The device operates from a 32 kHz crystal with an on-board PLL generating the required internal operating frequency. The output data rate from the part is software programmable. The peak-topeak resolution from the part varies with the programmed gain and output data rate. INTERFACE 3-Wire Serial SPITM, QSPI TM, MICROWIRETM, and DSP-Compatible Schmitt Trigger on SCLK The part operates from a single 3 V or 5 V supply. When operating from 3 V supplies, the power dissipation for the part is 3.84 mW typ. Both parts are pin-for-pin compatible allowing an upgradable path from 16 to 24 bits without the need for hardware modifications. The AD7708/AD7718 are housed in 28-lead SOIC and TSSOP packages. POWER Specified for Single 3 V and 5 V Operation Normal: 1.28 mA Typ @ 3 V Power-Down: 30 ␮A (32 kHz Crystal Running) On-Chip Functions Rail-to-Rail Input Buffer and PGA 2-Bit Digital I/O Port APPLICATIONS Industrial Process Control Instrumentation Pressure Transducers Portable Instrumentation Smart Transmitters FUNCTIONAL BLOCK DIAGRAM DVDD DGND REFIN2(+)/AIN9 REFIN1(+) REFIN2(–)/AIN10 REFIN1(–) XTAL1 XTAL2 OSC AND PLL AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 AIN8 POS BUF REFIN(+) MUX NEG BUF PGA DOUT DIN SCLK CS RDY RESET REFIN(–) SERIAL INTERFACE AND CONTROL LOGIC ⌺-⌬ ADC* *AD7708 16-BIT ADC *AD7718 24-BIT ADC AVDD AINCOM AD7708/AD7718 AVDD AGND I/O PORT P2 P1 SPI and QSPI are trademarks of Motorola Inc. MICROWIRE is a trademark of National Semiconductor Corp. VREF Select is a trademark of Analog Devices, Inc. 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. 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., 2001

ブランド

AD

会社名

Analog Devices

本社国名

U.S.A

事業概要

半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。

供給状況

 
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