AD7891

a LC2MOS 8-Channel, 12-Bit High Speed Data Acquisition System FEATURES Fast 12-Bit ADC with 1.6 ␮s Conversion Time 8 Single-Ended Analog Input Channels Overvoltage Protection on Each Channel Selection of Input Ranges: ؎5 V, ؎10 V for AD7891-1 0 to +2.5 V, 0 to +5 V, ؎2.5 V for AD7891-2 Parallel and Serial Interface On-Chip Track/Hold Amplifier On-Chip Reference Single-Supply, Low Power Operation (100 mW Max) Power-Down Mode (75 ␮W Typ) APPLICATIONS Data Acquisition Systems Motor Control Mobile Communication Base Stations Instrumentation VIN1A VIN1B VIN2A VIN2B VIN3A VIN3B VIN4A VIN4B VIN5A VIN5B VIN6A VIN6B VIN7A VIN7B VIN8A VIN8B AD7891 FUNCTIONAL BLOCK DIAGRAM VDD VDD REF OUT/ REF IN REF GND AD7891 2.5V REFERENCE STANDBY M U X TRACK/HOLD ADDRESS DECODE CONTROL LOGIC 12-BIT ADC CLOCK DATA / CONTROL LINES WR CS RD EOC CONVST MODE AGND AGND DGND GENERAL DESCRIPTION The AD7891 is an 8-channel, 12-bit data acquisition system with a choice of either parallel or seria...