Fully Accurate 14-Bit V DAC SPI Interface 4.5 V to 5.5 V in a TSSOP

The AD5025 / AD5045 / AD5065 are low power, dual 12-/14-/16-bit buffered voltage output nanoDAC® DACs offering relative accuracy specifications of ±1 LSB INL with individual reference pins, and can operate from a single 4.5 V to 5.5 V supply. The AD5025 / AD5045 / AD5065 also offer a differential accuracy specification of ±1 LSB. The parts use a versatile 3-wire, low power Schmitt trigger serial interface that operates at clock rates up to 50 MHz and is compatible with standard SPI®, QSPI™, MICROWIRE™, and DSP interface standards. The reference for the AD5025 / AD5045 / AD5065 are supplied from an external pin and a reference buffer is provided on chip. The AD5025 / AD5045 / AD5065 incorporate a power-on reset circuit that ensures the DAC output powers up zero scale or midscale and remains there until a valid write takes place to the device. The AD5025 / AD5045 / AD5065 contain a power-down feature that reduces the current consumption of the device to typically 400 nA at 5 V and provides software selectable output loads while in power-down mode. The parts are put into power-down mode over the serial interface. Total unadjusted error for the parts is <2.5 mV. The parts exhibit very low glitch on power-up. The outputs of all DACs can be updated simultaneously using the LDAC function, with the added functionality of user-selectable DAC channels to simultaneously update. There is also an asynchronous CLR that clears all DACs to a software-selectable code—0 V, midscale, or full scale. The parts also feature a power-down lockout pin, PDL, which can be used to prevent the DAC from entering power-down under any circumstances over the serial interface.

Product Highlights

* Dual channel available in a 14-lead TSSOP package with

individual voltage reference pins.

* 12-/14-/16-bit accurate, ±1 LSB INL.

* Low glitch on power-up.

* High speed serial interface with clock speeds up to 50 MHz.

* Three power-down modes available to the user.

* Reset to known output voltage (zero scale or midscale).

* Power-down lockout capability.

Applications

* Process controls

* Data acquisition systems

* Portable battery-powered instruments

* Digital gain and offset adjustment

* Programmable voltage and current sources

* Programmable attenuators

* Low power dual 12-/14-/16-bit DAC, ±1 LSB INL

* Individual voltage reference pins

* Rail-to-rail operation

* 4.5 V to 5.5 V power supply

* Power-on reset to zero scale or midscale

* Power down to 400 nA at 5 V

* 3 power-down functions

* Per channel power-down

* Low glitch upon power-up

* Hardware power-down lockout capability

* Hardware LDAC with software LDAC override function

* CLR function to programmable code

* SDO daisy-chaining option

* 14-lead TSSOP