GENERAL DESCRIPTION

The ALD1721E is a monolithic rail-to-rail precision CMOS operational amplifier with integrated user programmable EPAD (Electrically Programmable Analog Device) based offset voltage adjustment. The ALD1721E operational amplifier is a direct replacement of the ALD1701 operational amplifier, with the added feature of user-programmable offset voltage trimming resulting in significantly enhanced total system performance and user flexibility.

KEY FEATURES

? EPAD (Electrically Programmable Analog Device)

? User programmable VOS trimmer

? Computer-assisted trimming

? Rail-to-rail input/output

? Compatible with standard EPAD Programmer

? High precision through in-system circuit precision trimming

? Reduces or eliminates VOS, PSRR, CMRR and TCVOS errors

? System level “calibration” capability

? Application Specific Programming mode

? In-System Programming mode

? Electrically programmable to compensate for external component tolerances

? Achieves 0.01pA input bias current and 35μV input offset voltage simultaneously

? Compatible with industry standard pinout

BENEFITS

? Eliminates manual and elaborate system trimming procedures

? Remote controlled automated trimming

? In-System Programming capability

? No external components

? No internal chopper clocking noise

? No chopper dynamic power dissipation

? Simple and cost effective

? Small package size

? Extremely small total functional volume size

? Low system implementation cost

? Micropower and Low Voltage

APPLICATIONS

? Sensor interface circuits

? Transducer biasing circuits

? Capacitive and charge integration circuits

? Biochemical probe interface

? Signal conditioning

? Portable instruments

? High source impedance electrode amplifiers

? Precision Sample and Hold amplifiers

? Precision current to voltage converter

? Error correction circuits

? Sensor compensation circuits

? Precision gain amplifiers

? Periodic In-system calibration

? System output level shifter