GENERAL DESCRIPTION

The ALD1726E is a monolithic rail-to-rail ultra-micropower precision CMOS operational amplifier with integrated user programmable EPAD (Electrically Programmable Analog Device) based offset voltage adjustment. The ALD1726E is a direct replacement of the ALD1706 operational amplifier, with the added feature of user-programmable offset voltage trimming resulting in significantly enhanced total system performance and user flexibility. EPAD technology is an exclusive ALD design which has been refined for analog applications where precision voltage trimming is necessary to achieve a desired performance. It utilizes CMOS FETs as in circuit elements for trimming of offset voltage bias characteristics with the aid of a personal computer under software control. Once programmed, the set parameters are stored indefinitely within the device even after power down. EPAD offers the circuit designer a convenient and cost-effective trimming solution for achieving the very highest amplifier/system performance.

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 50µV input offset

voltage simultaneously

• Compatible with industry standard pinout

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