Dual, 12-Bit DAC+ with 2 ppm/°C Reference, SPI Interface

The AD5689R/AD5687R members of the nanoDAC+™ family are low power, dual, 16-/12-bit buffered voltage output digital-to-analog converters (DACs). The devices include a 2.5 V, 2 ppm/°C internal reference (enabled by default) and a gain select pin giving a full-scale output of 2.5 V (gain = 1) or 5 V (gain = 2). The devices operate from a single 2.7 V to 5.5 V supply, are guaranteed monotonic by design, and exhibit less than 0.1% FSR gain error and 1.5 mV offset error performance. Both devices are available in a 3 mm × 3 mm LFCSP and a TSSOP package.

The AD5689R/AD5687R also incorporate a power-on reset circuit and a RSTSEL pin that ensure that the DAC outputs power up to zero scale or midscale and remain there until a valid write takes place. Each part contains a per channel power-down feature that reduces the current consumption of the device to 4 μA at 3 V while in power-down mode.

The AD5689R/AD5687R use a versatile serial peripheral interface (SPI) that operates at clock rates up to 50 MHz. Both devices contain a VLOGIC pin that is intended for 1.8 V/3 V/5 V logic.

Product Highlights

* High Relative Accuracy (INL).

AD5689R (16-bit): ±2 LSB maximum

AD5687R (12-bit): ±1 LSB maximum

* Low Drift 2.5 V On-Chip Reference.

2 ppm/°C typical temperature coefficient

5 ppm/°C maximum temperature coefficient

* Two Package Options.

3 mm × 3 mm, 16-lead LFCSP

16-lead TSSOP

Applications

* Optical transceivers

* Base station power amplifiers

* Process control (PLC I/O cards)

* Industrial automation

* Data acquisition systems

* High relative accuracy (INL): ±2 LSB maximum at 16 bits

* Low drift 2.5 V reference: 2 ppm/°C typical

* Tiny package: 3 mm × 3 mm, 16-lead LFCSP

* TUE: ±0.1% of FSR maximum

* Offset error: ±1.5 mV maximum

* Gain error: ±0.1% of FSR maximum

* High drive capability: 20 mA, 0.5 V from supply rails

* User-selectable gain of 1 or 2 (GAIN pin)