The AD7224 is a precision 8-bit voltage output digital-to-analog converter with integrated output amplifier and dual-buffer interface logic on a single CMOS chip. The full rated performance of the device is achieved without external adjustments.
The dual-buffer interface logic consists of two 8-bit registers: an input register and a DAC register. The analog output of this converter depends only on the data held in the DAC registers. With a dual-buffer architecture, systems containing multiple AD7224s can be updated simultaneously. Under the control of three external lines (CS, WR and LDAC), both registers are able to operate in transparent mode. When both registers are in transparent mode, the RESET line acts as a zero-overload function, which is useful for system calibration cycles. All logic inputs are compatible with TTL and CMOS (5V) levels, and the control logic is compatible with most 8-bit microprocessor speeds.
With dual supplies and input references of +2V to +12.5V, the device is guaranteed to provide rated performance. The device can also operate from a single supply, +10V reference. The output amplifier is capable of generating a voltage of +10V on a 2 K (Ohm) load.
The AD7224 is manufactured using the Full Ion Implantation High-Speed Linear-Compatible CMOS (LC2MOS) process, a process developed for the integration of high-speed digital logic circuitry with precision analog circuitry on the same chip.