Electronic Design

Precision MOSFET Arrays Matched To Within 1-mV Offset

When used in precision current mirror or current multiplier applications, the n-channel ALD1121E (dual) and ALD1123E (quad) precision MOSFET arrays can provide a current source from 100 nA to 3 mA and either positive, negative, or zero temperature-coefficient matching characteristics. The arrays are matched to within an offset voltage of 1 mV.

The arrays are manufactured on Advanced Linear Devices' (ALD) e-trim process, which ensures tight matching and tracking of on-resistance, threshold voltage, and turn-on current operating characteristics. They also feature a very high typical input impedance of 1012 Ω.

Power-supply requirements range from 1.2 V to 10 V. Though not required, users can e-trim both devices as an active in-circuit element via user-designed interface circuitry and an ALD Electrically Program-mable Analog Device (EPAD) programming module.

The dual ALD1121E, which has two separate source pins, comes in an eight-pin plastic dual-inline package or small-outline IC package. The quad ALD1123E offers four separate source pins and maintains a 16-pin footprint. The standard operating temperate ranges from 0°C to 70°C. Optional industrial and military operating-temperature ranges are available in various ceramic packages.

Pricing for the MOSFET pairs in the standard operating-temperature range goes from $0.75 to $1.24 each in 1000-piece quantities. Prototype and small-volume quantities are currently in stock.

Advanced Linear Devices Inc.
(408) 747-1155

See associated figure.

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