AD7845

a FEATURES 12-Bit CMOS MDAC with Output Amplifier 4-Quadrant Multiplication Guaranteed Monotonic (TMIN to T MAX) Space-Saving 0.3" DIPs and 24- or 28-Terminal Surface Mount Packages Application Resistors On Chip for Gain Ranging, etc. Low Power LC 2MOS APPLICATIONS Automatic Test Equipment Digital Attenuators Programmable Power Supplies Programmable Gain Amplifiers Digital-to-4–20 mA Converters LC2MOS Complete 12-Bit Multiplying DAC AD7845 FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD7845 is the industry’s first 4-quadrant multiplying D/A converter with an on-chip amplifier. It is fabricated on the LC2MOS process, which allows precision linear components and digital circuitry to be implemented on the same chip. The 12 data inputs drive latches which are controlled by standard CS and WR signals, making microprocessor interfacing simple. For stand-alone operation, the CS and WR inputs can be tied to ground, making all latches transparent. All digital inputs are TTL and 5 V CMOS compatible. The output amplifier can supply ± 10 V into a 2 kΩ load. It is internally compensated, and its input offset voltage is low due to laser trimming at wafer level. For normal operation, RFB is tied to VOUT, but the user may alternatively choose RA, RB or RC to scale the output voltage range. 1. Voltage Output Multiplying DAC The AD7845 is the first DAC which has a full 4-quadrant multiplying capability and an output amplifier on chip. All specifications include ampl...