MP7628

FEATURES w w Readback Capability for all DACs On-Chip Latches for All DACs Linearity Grades to +1/8 LSB Single Supply Voltage (5 Volt) DACs Matched to 1% Four Quadrant Multiplication Microprocessor TTL/CMOS Compatible Latch-Up Free Dual Version: MP7529B a D . w S a t e e h U 4 t m o .c MP7628 5 V CMOS Quad Multiplying 8-Bit Digital-to-Analog Converter APPLICATIONS Microprocessor Controlled Gain and Attenuation Circuits Microprocessor Controlled/Programmable Power Supplies Hardware Redundant Applications Requiring Data Readback GENERAL DESCRIPTION The MP7628 is a quad 8-bit Digital-to-Analog Converter designed using a decoded DAC architecture featuring excellent DAC-to-DAC matching and guaranteed monotonicity. Separate on-chip latches are provided for each DAC to allow easy microprocessor interface. The readback function allows the user to poll or read the data latches, eliminating the need for storing information in RAM. In the event the microprocessor power supply is interrupted, it can poll the DACs to establish the last known system state. Data is transferred into any of the four DAC data latches via common 8-bit TTL/CMOS compatible input port. Control inputs DS1, DS2 and A/B determine which DAC is to be loaded. The MP7628’s load cycle is similar to the write cycle of a random access memory and the device is bus compatible with most 8-bit microprocessors. SIMPLIFIED BLOCK DIAGRAM DB0 (LSB) DATA BUS DB7 (MSB) BIDIRECTIONAL LINE DRIVER ...