GENERAL DESCRIPTION
ALD1123E/ALD1121E are monolithic quad/dual EPAD® (Electrically Programmable Analog Device) N-channel MOSFETs with electrically adjustable threshold (turn-on) voltage. The ALD1123E/ALD1121E are precision matched and adjusted (e-trimmed) at the factory resulting in quad/dual MOSFETs that are highly matched in electrical characteristics.

FEATURES
• Electrically Programmable Analog Device CMOS Technology
• Operates from 2V, 3V, 5V to 10V
• Flexible basic circuit building block and design element
• Very high resolution -- average e-trim voltage resolution of 0.1mV
• Wide dynamic range -- current levels from 0.1µA to 3000µA
• Voltage adjustment range from 1.000V to 3.000V in 0.1mV steps
• Proven, non-volatile CMOS technology
• Typical 10 years drift of less than 2mV
• Usable in voltage mode or current mode
• High input impedance -- 1012Ω
• Very high DC current gain -- greater than 109
• Device operating current has positive temperature coefficient range and negative temperature coefficient range with cross-over zero temperature coefficient current level at 68µA
• Tight matching and tracking of on-resistance between different devices with e-trim
• Wide dynamic resistance matching range
• Very low input currents and leakage currents
• Low cost, monolithic technology
• Application-specific or in-system programming modes
• Optional user software-controlled automation
• Optional e-trim of any standard/custom configuration
• Micropower operation
• Available in standard PDIP, SOIC and hermetic CDIP packages
• Suitable for matched-pair balanced circuit configuration
• Suitable for both coarse and fine trimming as well as matched MOSFET array applications

APPLICATIONS
• Precision PC-based electronic calibration
• Automated voltage trimming or setting
• Remote voltage or current adjustment of inaccessible nodes
• PCMCIA based instrumentation trimming
• Electrically adjusted resistive load
• Temperature compensated current sources and current mirrors
• Electrically trimmed/calibrated current sources
• Permanent precision preset voltage level shifter
• Low temperature coefficient voltage and/or current bias circuits
• Multiple preset voltage bias circuits
• Multiple channel resistor pull-up or pull-down circuits
• Microprocessor based process control systems
• Portable data acquisition systems
• Battery operated terminals and instruments
• Remote telemetry systems
• E-trim gain amplifiers
• Low level signal conditioning
• Sensor and transducer bias currents
• Neural networks