
The LTC2655's 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.
LTC2655 16-bit and 12-bit DACs and demo boards are now available. Pricing begins at $5.04 each for the 12-bit options and $12.29 each for the 16-bit options in 1,000-piece quantities.