AD5303

The AD5303/AD5313/AD5323 are dual 8-, 10- and 12-bitbuffered voltage output DACs in a 16-lead TSSOP package thatoperate from a single +2.5 V to +5.5 V supply consuming 230 Aat 3 V. Their on-chip output amplifiers allow the outputs toswing rail-to-rail with a slew rate of 0.7 V/s. The AD5303/AD5313/AD5323 utilize a versatile 3-wire serial interface thatoperates at clock rates up to 30 MHz and is compatible withstandard SPI™, QSPI, MICROWIRE™ and DSP interfacestandards.

The references for the two DACs are derived from two referencepins (one per DAC). These reference inputs may be configuredas buffered or unbuffered inputs. The parts incorporate a poweron-reset circuit that ensures that the DAC outputs power-up to0 V and remain there until a valid write to the device takes place.There is also an asynchronous active low CLR pin that clearsboth DACsto 0 V. The outputs of both DACs may be updatedsimultaneously using the asynchronous LDAC input. Theparts contain a power-down feature that reduces the currentconsumption of the devices to 200 nA at 5 V (50 nA at 3 V) andprovides software-selectable output loads while in power-downmode. The parts may also be used in daisy-chaining applicationsusing the SDO pin.

The low power consumption of these parts in normal operationmake them ideally suited to portable battery operated equipment.The power consumption is 1.5 mW at 5 V, 0.7 mW at3 V, reducing to 1 W in power-down mode.