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AD974BN Datenblatt(PDF) 1 Page - Analog Devices |
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AD974BN Datenblatt(HTML) 1 Page - Analog Devices |
1 / 20 page REV. 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD974 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 4-Channel, 16-Bit, 200 kSPS Data Acquisition System FUNCTIONAL BLOCK DIAGRAM CONTROL LOGIC & CALIBRATION CIRCUITRY PWRD V1A V1B BIP CAP REF VDIG VANA EXT/ INT DATACLK R/ C CS SYNC DGND BUSY WR2 WR1 A1 A0 AGND2 AGND1 REF BUFF 2.5V REFERENCE AD974 4 TO 1 MUX + LATCH EN V2A V2B V3A V3B V4A V4B SWITCHED CAP ADC SERIAL INTERFACE 16 DATA RESISTIVE NETWORK RESISTIVE NETWORK RESISTIVE NETWORK RESISTIVE NETWORK CLOCK FEATURES Fast 16-Bit ADC with 200 kSPS Throughput Four Single-Ended Analog Input Channels Single +5 V Supply Operation Input Ranges: 0 V to +4 V, 0 V to +5 V and 10 V 120 mW Max Power Dissipation Power-Down Mode 50 W Choice of External or Internal 2.5 V Reference On-Chip Clock Power-Down Mode GENERAL DESCRIPTION The AD974 is a four-channel, data acquisition system with a serial interface. The part contains an input multiplexer, a high- speed 16-bit sampling ADC and a +2.5 V reference. All of this operates from a single +5 V power supply that also has a power- down mode. The part will accommodate 0 V to +4 V, 0 V to +5 V or ±10 V analog input ranges. The interface is designed for an efficient transfer of data while requiring a low number of interconnects. The AD974 is comprehensively tested for ac parameters such as SNR and THD, as well as the more traditional parameters of offset, gain and linearity. The AD974 is fabricated on Analog Devices’ BiCMOS process, which has high performance bipolar devices along with CMOS transistors. The AD974 is available in 28-lead DIP, SOIC and SSOP packages. PRODUCT HIGHLIGHTS 1. The AD974 is a complete data acquisition system combining a four-channel multiplexer, a 16-bit sampling ADC and a +2.5 V reference on a single chip. 2. The part operates from a single +5 V supply and also has a power-down feature. 3. Interfacing to the AD974 is simple with a low number of interconnect signals. 4. The AD974 is comprehensively specified for ac parameters such as SNR and THD, as well as dc parameters such as linearity and offset and gain errors. |
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