Analog Devices Inc.

The AD5678 is a low power, octal, buffered voltage-output DAC with four 12-bit DACs and four 16-bit DACs in a single package. All devices operate from a single 2.7 V to 5.5 V supply and are guaranteed monotonic by design.The AD5678 has an on-chip reference with an internal gain of 2. The AD5678-1 has a 1.25 V 5 ppm/?C reference, giving a full-scale output of 2.5 V; the AD5678-2 has a 2.5 V 5 ppm/?C reference, giving a full-scale output of 5 V. The on-board reference is off at power-up, allowing the use of an external reference. The internal reference is enabled via a software write.The part incorporates a power-on reset circuit that ensures that the DAC output powers up to 0 V and remains powered up at this level until a valid write takes place. The part contains a power-down feature that reduces the current consumption of the device to 400 nA at 5 V and provides software-selectable output loads while in power-down mode for any or all DAC channels.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 AD5678 utilizes a versatile 3-wire serial interface that operates at clock rates of up to 50 MHz and is compatible with standard SPI?, QSPI?, MICROWIRE?, and DSP interface standards. The on-chip precision output amplifier enables rail-to-rail output swing.PRODUCT HIGHLIGHTS Octal DAC (four 12-bit DACs and four 16-bit DACs). On-chip 1.25 V/2.5 V, 5 ppm/?C reference. Available in 14-lead/16-lead TSSOP. Power-on reset to 0 V. Power-down capability. When powered down, the DAC typically consumes 200 nA at 3 V and 400 nA at 5 VAPPLICATIONS Process control Data acquisition systems Portable battery-powered instruments Digital gain and offset adjustment Programmable voltage current sources Programmable attenuators

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