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