Octal, 13-Bit Voltage-Output DAC with Parallel Interface

Active: In Production.

The MX7839 contains eight 13-bit, voltage-output digital-to-analog converters (DACs). On-chip precision output amplifiers provide the voltage outputs. The device operates from ±15V supplies. Its bipolar output voltage swing is ±10V and is achieved with no external components. The MX7839 has three pairs of differential reference inputs; two of these pairs are connected to two DACs each, and a third pair is connected to four DACs. The references are independently controlled, providing different full-scale output voltages to the respective DACs.

The MX7839 features double-buffered interface logic with a 13-bit parallel data bus. Each DAC has an input latch and a DAC latch. Data in the DAC latch sets the output voltage. The eight input latches are addressed with three address lines. Data is loaded to the input latch with a single write instruction. An asynchronous load input (active-low LDAC) transfers data from the input latch to the DAC latch. The active-low LDAC input controls all DACs; therefore, all DACs can be updated simultaneously by asserting active-low LDAC. An asynchronous active-low CLR input sets the output of all eight DACs to the respective DUTGND input of the op amp. Note that active-low CLR is a CMOS input, which is powered by V_DD. All other logic inputs are TTL/CMOS compatible. The MX7839 is pin-for-pin compatible with AD7839.

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