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Linear Technology Corporation has introduced the LTC2655, a quad voltage output 16- and 12-bit digital-to-analogue converter (DAC) family with internal reference and I2C interface. The LTC2655 DACs achieve 16-bit performance of +4LSB INL maximum over temperature, a factor of four better than the closest 16-bit quad competitor. It offers the lowest offset error +2mV (max) and lowest gain error 0.1% (max), a combination that ensures that the device retains accuracy near the supply rails and provides users with a wider effective output range.
The LTC2655's precision specifications make it suitable for multichannel, open loop and closed loop systems. Applications include mobile communication, instrumentation, process control and industrial automation, automated test equipment (ATE) and automotive systems. LTC2655 16-bit and 12-bit DACs and demo boards are now available.
Its integrated reference achieves 2ppm/°C typical and 10ppm/°C maximum temperature coefficient. It is offered in small 20-pin 4mm x 4mm QFN and 16-pin narrow SSOP packages, providing space savings in densely packed circuit boards. AC performance of 9.1us settling time for a half-scale step and <1nV•s crosstalk results in minimal disturbance between DAC channels. The LTC2655 operates from a single 2.7V to 5.5V supply and communicates via a 2-wire I2C compatible interface at up to 400kHz.
The LTC2655 offers a wide range of options to meet application-specific requirements. Designers can choose between 16- or 12-bit resolution and an internal 1.25V or 2.048V reference, which produce a full-scale output voltage of 2.5V or 4.096V. Alternatively, an external reference up to half the supply voltage can be used for rail-to-rail operation. The LTC2655 includes a hardware option to power up the DAC outputs at zero-scale or mid-scale, allowing more flexibility for designs that cannot be forced to ground when power is first applied. The device also includes a hardware load-DAC (LDAC) pin, three address pins for selecting 27 unique I2C addresses or 1 global address, and a REFLO pin.
