MAX547

19-0257; Rev 3; 12/95 Octal, 13-Bit Voltage-Output DAC with Parallel Interface _________________General Description The MAX547 contains eight 13-bit, voltage-output digital-toanalog converters (DACs). On-chip precision output amplifiers 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 components. The MAX547 has four separate reference inputs; each is connected to two DACs, providing different fullscale 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_ ) input transfers data from the – — — – input latch to the DAC latch. The four LD_ inputs each control two DACs, and all DAC latches can be updated simultane– — — – – — — – ously by asserting all LD_ pins. An asynchronous clear (CLR) input resets the output of all eight DACs to AGND_. Asserting – — — – CLR resets both the DAC and the input latch to bipolar zero (1000hex). On power-up, reset circuitry performs the same – — — – function as CLR. All logic inputs are TTL/CMOS compatible. The MAX547 is available in 44-pin plastic quad flat pack and 44-pin PLCC packages. _____________________________Featur...