MAXIM DS1868BE-010+T/R

The DS1868B Dual Digital Potentiometer Chip consists of two digitally controlled solid-state potentiometers. Each potentiometer is composed of 256 resistive sections. Between each resistive section and both ends of the potentiometer are tap points which are accessible to the wiper. The position of the wiper on the resistor array is set by an 8-bit value that controls which tap point is connected to the wiper output. Communication and control of the device is accomplished via a 3-wire serial port interface. This interface allows the device wiper position to be read or written. Both potentiometers can be connected in series (or stacked) for an increased total resistance with the same resolution. For multiple-device, single-processor environments, the DS1868B can be cascaded or daisy chained. This feature provides for control of multiple devices over a single 3-wire bus. The DS1868B is offered in three standard resistance values which include 10kΩ, 50kΩ, and 100kΩ versions. The part is available in 16-pin SO (300-mil) and 20-pin (173-mil) TSSOP packages.

• Two digitally controlled, 256-position potentiometers
• Serial port provides means for setting and reading both potentiometers
• Resistors can be connected in series to provide increased total resistance
• 20-pin TSSOP and 16-pin SO packages are available
• Resistive elements are temperature compensated to ±0.3 LSB relative linearity
• Standard resistance values: DS1868B-10 ∼10kΩ, DS1868B-50 ∼50kΩ, DS1868B-100 ∼100kΩ
• +5V or ±3V operation
• Operating temperature range: Industrial: -40°C to +85°C