Linear Technology Corporation has introduced the LTC2605, an octal 16-bit voltage output DAC with an I2C serial interface in a 16-pin SSOP package, the same board area as an SO-8.
At 16-bits, the LTC2605 is said to achieve the industry's smallest footprint for octal DACs while improving DC performance over competitive products. The device's monotonic performance, small size and low power reportedly make it ideal for digital calibration, trim/adjust and level setting applications in a wide variety of products.
The LTC2605's output buffers deliver drive capability over their entire 2.7V to 5.5V supply voltage range. The DAC outputs directly drive capacitive loads up to 1000pF or current loads up to 15mA and maintain linearity to within millivolts of VCC or ground.
Linear Technology says the low output offset (9mV maximum) provides a starting code voltage closer to ground than competing devices. In addition, the company adds that low output voltage noise (15uVp-p) reduces the need for output filtering. A full-scale transition on seven of the eight DACs causes less than 10uV change in the eighth DAC, eliminating crosstalk as a source of error. The LTC2605's low 250uA supply current per DAC at 3V and 1uA maximum shutdown current are suited for battery-powered applications.
The two-wire I2C compatible interface allows independent control of each DAC by means of a flexible input control word. The LTC2605 provides 27 user-selectable slave addresses, allowing several LTC2605s on the same bus and minimizing address conflicts with other components. The LTC2605 is one device in a family of compact DACs from octals to singles with either I2C or SPI interfaces. The LTC2615/LTC2615-1 and LTC2625/LTC2625-1 are pin-compatible 14-bit and 12-bit octal DACs, offering multiple price/performance options for one design.
The "-1" versions power-on and reset to mid-scale, whereas the other versions power-on and reset to zero scale. Quad versions (LTC2609) in the same size package feature separate reference inputs for each DAC and a common zero scale input that allows for offset adjustment. Duals (LTC2607) in the 3mm x 4mm DFN package are also available to complement the previously announced single (LTC2606) in the 3mm x 3mm DFN package.
Pricing starts at $14.70 each for the LTC2605 in 1,000-piece quantities.