AD7228ACR

The AD7228ACR contains eight 8-bit voltage-mode digital-to-analog converters, with output buffer amplifiers and interface logic on a single monolithic chip. No external trims are required to achieve full specified performance for the part.

Separate on-chip latches are provided for each of the eight D/A converters. Data is transferred into the data latches through a common 8-bit TTL/CMOS (5 V) compatible input port. Address inputs A0, A1 and A2 determine which latch is loadedwhen WR goes low. The control logic is speed compatible withmost 8-bit microprocessors.

Specified performance is guaranteed for input reference voltages from +2 to +10 V when using dual supplies. The part is also specified for single supply +15 V operation using a reference of +10 V and single supply +5 V operation using a reference of +1.23 V. Each output buffer amplifier is capable of developing+10 V across a 2 kΩ load.

The AD7228ACR is fabricated on an all ion-implanted, high-speed, Linear Compatible CMOS (LC2MOS) process which has been specifically developed to integrate high-speed digital logic circuits and precision analog circuits on the same chip.

Product Highlights

Eight DACs and Amplifiers in Small PackageThe single-chip design of eight 8-bit DACs and amplifiers allowsa dramatic reduction in board space requirements andoffers increased reliability in systems using multiple converters.Its pinout is aimed at optimizing board layout with allanalog inputs and outputs at one side of the package and alldigital inputs at the other.

Single or Dual Supply OperationThe voltage-mode configuration of the DACs allows singlesupply operation of the AD7228A. The part can also be operatedwith dual supplies giving enhanced performance forsome parameters.

Microprocessor Compatibility

The AD7228ACR has a common 8-bit data bus with individualDAC latches, providing a versatile control architecture forsimple interface to microprocessors. All latch enable signalsare level triggered and speed compatible with most high performance8-bit microprocessors.

Feature