One-time-programmable set-and-forget digital trimmer
18 June 2003
Electronics Technology
The AD5273 is claimed to be the industry's lowest power, most compact nonvolatile digital potentiometer device. Offered as a single-channel, 64-position, one-time programmable, digitally controlled variable resistor (VR), this Analog Devices part performs the same electronic adjustment function as a potentiometer or variable resistor. In a compact 2,9 mm X 3 mm SOT-23-8 package, the AD5273 eliminates the need for careful matching of specific resistance values in transducer adjustment applications with limited mechanical or other tolerance distributions.
These devices can provide variable resistance under 2-wire I2C compatible program control in servo adjustment factory applications. Once the final value is determined, the user asserts a permanent write command freezing the wiper position at the desired setting (analogous to placing epoxy on a mechanical trimmer). This one-time program sets a validation bit, which can be read back through the I2C interface. Once this acknowledge bit is set, the wiper position will not change regardless of power supply sequencing, temperature, RF fields, or ESD exposure.
Key features: compact SOT-23-8 package; 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance; low power - IDD~0,1 µA typ, with VDD 2,7 V to 5,5 V; operating temp -40 to +105°C; 6 MHz bandwidth.
Some applications are: transducer circuit calibration; electronics level setting; mechanical trimmer replacement in new designs; automotive sensor adjustment; one-time final system calibration.
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