CAT522

The CAT522 is a dual, 8-bit digitally-programmable potentiometer (DPP™) configured for programmable voltage and DAC-like applications. Intended for final calibration of products such as camcorders, fax machines and cellular telephones on automated high volume production lines, it is also well suited for self-calibrating systems and for applications where equipment which requires periodic adjustment is either difficult to access or in a hazardous environment.

The CAT522 offers two independently programmable DPPs each having its own reference inputs and each capable of rail to rail output swing. The wipers are buffered by rail to rail opamps. Wiper settings, stored in non-volatile NVRAM memory, are not lost when the device is powered down and are automatically reinstated when power is returned. Each wiper can be dithered to test new output values without effecting the stored settings and stored settings can be read back without disturbing the DPP's output.

The CAT522 is controlled with a simple 3-wire, microwire-like serial interface. A Chip Select pin allows several devices to share a common serial interface. Communication back to the host controller is via a single serial data line thanks to the CAT522 Tri-Stated Data Output pin. A RDY/BSY output working in concert with an internal low voltage detector signals proper operation of the non-volatile NVRAM memory Erase/Write cycle.

The CAT522 is available in the 0C to 70C commercial and -40C to 85C industrial operating temperature ranges. Both 14-pin plastic DIP and surface mount packages are available.