The AD7224 is a precision 8-bit voltage-output, digital-toanalog
converter, with output amplifier and double buffered
interface logic on a monolithic CMOS chip. No external trims
are required to achieve full specified performance for the part.
The double buffered interface logic consists of two 8-bit registers–
an input register and a DAC register. Only the data held in
the DAC registers determines the analog output of the converter.
The double buffering allows simultaneous update in a
system containing multiple AD7224s. Both registers may be
made transparent under control of three external lines, CS, WR
and LDAC. With both registers transparent, the RESET line
functions like a zero override; a useful function for system calibration
cycles. All logic inputs are TTL and CMOS (5 V) level
compatible and the control logic is speed compatible with most
8-bit microprocessors.