MX7841

The MX7841 contains eight 14-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 voltageswing ranges from (VSS + 2.5V) to (VDD - 2.5V) and is achieved with no external components. The MX7841 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 fullscale output voltages to the respective DACs.

The MX7841 features double-buffered interface logic with a 14-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 (LDAC) transfers data from the input latch to the DAC latch. The LDAC input controls all DACs; therefore, all DACs can be updated simultaneously by asserting LDAC.

An asynchronous CLR input sets the output of all eight DACs to the respective DUTGND input of the op amp. Note that CLR is a CMOS input, which is powered by VDD. All other logic inputs are TTL/CMOS compatible. The MX7841 is pin-for-pin compatible with AD7841.