MAX547

The MAX547 contains eight 13-bit, voltage-output digital-to-analog converters (DACs). On-chip precision output ampli-fiers provide the voltage outputs. The MAX547 operates from a ±5V supply. Bipolar output voltages with up to ±4.5V voltage swing can be achieved with no external compo-nents. The MAX547 has four separate reference inputs;each is connected to two DACs, providing different full-scale output voltages for every DAC pair.

The MAX547 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 (LD_-</a>)input transfers data from the input latch to the DAC latch. The four LD_-</a> inputs each control two DACs, and all DAC latches can be updated simultane-ously by asserting all LD_-</a>pins. An asynchronous clear (CLR</a>)input resets the output of all eight DACs to AGND_. Asserting CLR</a> resets both the DAC and the input latch to bipolar zero (1000hex). On power-up, reset circuitry performs the same function as CLR</a>.All logic inputs are TTL/CMOS compatible. The MAX547 is available in 44-pin plastic quad flat pack and 44-pin PLCC packages.