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 610 V 120 mW Max Power Dissipation Power-Down Mode 50 mW 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 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 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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