Dual 16-Bit DAC with 5 ppm/°C On-Chip Reference

The AD5623R / AD5643R / AD5663R, members of the nanoDAC® family, are low power, dual 12-, 14-, and 16-bit buffered voltage-out digital-to-analog converters (DAC) that operate from a single 2.7 V to 5.5 V supply and are guaranteed monotonic by design.

The AD5623R / AD5643R / AD5663R have an on-chip reference. The AD5623R-3 / AD5643R-3 / AD5663R-3 have a 1.25 V, 5 ppm/°C reference, giving a full-scale output of 2.5 V; and the AD5623R-5 / AD5643R-5 / AD5663R-5 have a 2.5 V, 5 ppm/°C reference, giving a full-scale output of 5 V. The on-chip reference is off at power-up, allowing the use of an external reference; and all devices can be operated from a single 2.7 V to 5.5 V supply. The internal reference is turned on by writing to the DAC.

The parts incorporate a power-on reset circuit that ensures the DAC output powers up to 0 V and remains there until a valid write takes place. The part contains a power-down feature that reduces the current consumption of the device to 480 nA at 5 V and provides software-selectable output loads while in power-down mode.

The low power consumption of this part in normal operation makes it ideally suited to portable, battery-operated equipment.

The AD5623R / AD5643R / AD5663R use a versatile, 3-wire serial interface that operates at clock rates up to 50 MHz, and they are compatible with standard SPI®, QSPI™, MICROWIRE™, and DSP interface standards. The on-chip precision output amplifier enables rail-to-rail output swing to be achieved.

PRODUCT HIGHLIGHTS

* Dual 12-, 14-, and 16-bit DAC.

* On-chip 1.25 V/2.5 V, 5 ppm/°C reference.

* Available in 10-lead MSOP and 10-lead, 3 mm × 3 mm LFCSP.

* Low power; typically consumes 0.6 mW at 3 V and 1.25 mW at 5 V.

* 4.5 μs maximum settling time for the AD5623R.

APPLICATIONS

* Process control

* Data acquisition systems

* Portable battery-powered instruments

* Digital gain and offset adjustment

* Programmable voltage and current sources

* Programmable attenuators

* Low power, smallest pin-compatible, dual nanoDAC

AD5663R: 16 bits

AD5643R: 14 bits

AD5623R: 12 bits

* User-selectable external or internal reference

External reference default

On-chip 1.25 V/2.5 V, 5 ppm/°C reference