AD7226

FEATURES Four 8-Bit DACs with Output Amplifiers Skinny 20-Lead DIP, SOIC, SSOP, and PLCC Packages Microprocessor-Compatible TTL/CMOS-Compatible No User Trims Extended Temperature Range Operation Single Supply Operation Possible APPLICATIONS Process Control Automatic Test Equipment Automatic Calibration of Large System Parameters, e.g., Gain/Offset LC2MOS Quad 8-Bit D/A Converter AD7226 FUNCTIONAL BLOCK DIAGRAM VREF VDD LATCH A MSB DATA (8-BIT) LSB D A LATCH B T A B U LATCH C S LATCH D WR CONTROL A1 LOGIC A0 DAC A A DAC B B DAC C C DAC D D AD7226 VSS AGND AGND VOUTA VOUTB VOUTC VOUTD GENERAL DESCRIPTION The AD7226 contains four 8-bit voltage-output digital-toanalog 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 four D/A converters. Data is transferred into one of these data latches through a common 8-bit TTL/CMOS (5 V) compatible input port. Control inputs A0 and A1 determine which DAC is loaded when WR goes low. The control logic is speed-compatible with most 8-bit microprocessors. Each D/A converter includes an output buffer amplifier capable of driving up to 5 mA of output current. The amplifiers’ offsets are laser-trimmed during manufacture, thereby eliminating any requirement for offset nulling. Specified performance is guaranteed for input reference voltages from 2 V ...