CAT521 Datasheet | Catalyst Semiconductor

FEATURES s Buffered Outputs s Output settings retained without power s Output range includes both supply rails s Programming voltage generated on-chip s Serial µP interface s Single supply operation: 2.7V-5.5V APPLICATIONS s Automated product calibration. s Remote control adjustment of equipment s Offset, gain and zero adjustments in Self- Calibrating and Adaptive Control systems. s Tamper-proof calibrations. DESCRIPTION The CAT521 is a dual 8-Bit Memory DAC designed as an electronic replacement for mechanical potentiometers and trim pots. Intended for final calibration of products such as camcorders, fax machines and cellular telephones on automated high volume production lines and systems capable of self calibration, it is also well suited for applications were equipment requiring periodic adjustment is either difficult to access or located in a hazardous environment. The CAT521 consists of a programmable DAC with independent high and low reference inputs and is capable of a rail to rail output swing. The output is buffered by a rail to rail OP AMP. Output settings, stored in nonvolatile EEPROM memory, are not lost when the device is powered down and are automatically reinstated when power is returned. The output can be dithered to test new output values without effecting the stored settings FUNCTIONAL DIAGRAM VDD and stored settings can be read back without disturbing the DAC’s output. Control of the CAT521 is acplished with a simple 3 wire serial interface. A Chip Select pin allows several CAT521's to share a mon serial interface and munications back to the host controller is via a single serial data line thanks to the CAT521’s Tri-Stated Data Output pin. A RDY/BSY output working in concert with an internal low voltage detector signals proper operation of EEPROM Erase/Write cycle. The CAT521 operates from a single 3- 5 volt power supply. The high voltage required for EEPROM Erase/ Write operations is generated on-chip. The CAT521 is available in the 0°C to...