AD974 Datasheet | Analog Devices

FEATURES Fast 16-Bit ADC with 200 k SPS 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 m W Max Power Dissipation Power-Down Mode 50 ␮W Choice of External or Internal 2.5 V Reference On-Chip Clock Power-Down Mode V1A V1B 4-Channel, 16-Bit, 200 k SPS Data Acquisition System AD974 FUNCTIONAL BLOCK DIAGRAM PWRD BIP CAP REF VDIG VANA REF BUFF RESISTIVE NETWORK 2.5V REFERENCE EXT/INT SWITCHED 16 CAP ADC DATACLK SERIAL INTERFACE DATA R/C CS CLOCK SYNC V2A V2B RESISTIVE NETWORK 4 TO 1 MUX + LATCH V3A V3B RESISTIVE NETWORK V4A V4B RESISTIVE NETWORK EN CONTROL LOGIC & CALIBRATION CIRCUITRY GENERAL DESCRIPTION The AD974 is a four-channel, data acquisition system with a serial interface. The part contains an input multiplexer, a highspeed 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 powerdown mode. The part will acmodate 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 prehensively 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’ Bi CMOS process, which has high performance bipolar devices along with CMOS transistors. The AD974 is available in 28-lead DIP, SOIC and SSOP packages. AGND1 AGND2 A0 A1 WR1 WR2 BUSY DGND PRODUCT HIGHLIGHTS 1. The AD974 is a plete data acquisition system bining 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 prehensively specified for ac parameters such as SNR and THD, as well as dc parameters such as linearity and offset...