Linear Technology LTC2655 digital-to-analog converter family

Linear Technology has introduced the LTC2655, a quad voltage output 16- and 12-bit digital-to-analog converter family with internal reference and I²C interface.

It achieves 16-bit performance of ±4LSB INL maximum over temperature. The device offers offset error ±2 mV (max) and low 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.

It is suitable for multichannel, open loop and closed loop systems. Applications include mobile communication, instrumentation, process control and industrial automation, automated test equipment and motor vehicle systems.

The device’s integrated reference achieves 2 ppm/°C typical and 10 ppm/°C maximum temperature coefficient. It is offered in small 20-pin 4 x 4 mm QFN and 16-pin narrow SSOP packages, providing space savings in densely packed circuit boards.

AC performance of 9.1 µs settling time for a half-scale step and <1 nV•s crosstalk results in minimal disturbance between DAC channels. The converter operates from a single 2.7 to 5.5 V supply and communicates via a 2-wire I²C compatible interface at up to 400 kHz.

Designers can choose between 16- or 12-bit resolution and an internal 1.25 or 2.048 V reference, which produce a full-scale output voltage of 2.5 or 4.096 V. Alternatively, an external reference up to half the supply voltage can be used for rail-to-rail operation.

The device 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 pin, three address pins for selecting 27 I²C addresses or one global address, and a REFLO pin.

Features include: maximum INL error: ±4LSB at 16 bits; guaranteed monotonic over temperature; selectable internal or external reference; integrated reference buffers; ultralow crosstalk between DACs (<1 nV•s); power-on reset to zero-scale/mid-scale; asynchronous DAC update pin.