ISL90728
Single Volatile 128-Tap Digitally Controlled Potentiometer (XDCP™)

Key Features

• Volatile Solid-State Potentiometer
• I²C Serial Bus Interface
• DCP Terminal Voltage, 2.7V to 5.5V
• Low Tempco
• Rheostat - 45 ppm/°C Typical
• Divider - 15 ppm/°C Typical
• 128 Wiper Tap Points
• Wiper Resistance 70Ω Typ at V_CC = 3.3V
• Low Power CMOS
• Active Current, 200µA Max
• Standby Current, 500nA Max
• Available R_TOTAL Values = 50kΩ, 10kΩ
• Power-on Preset to Midscale
• Packaging
• 6 Ld SC-70
• Pb-Free (RoHS Compliant)

Description

The Intersil ISL90727 and ISL90728 are digitally controlled potentiometers (XDCP™). Each device consists of a resistor array, wiper switches, and a control section. The wiper position is controlled by an I²C Bus™.

The potentiometer is implemented by a resistor array composed of 127 resistive elements and a wiper switching network. Between each element and at either end are tap points accessible to the wiper terminal. The position of the wiper element is controlled by the SDA and SCL inputs.

Applications

• Mechanical Potentiometer Replacement
• Transducer Adjustment of Pressure, Temperature, Position, Chemical, and Optical Sensors
• RF Amplifier Biasing
• LCD Brightness and Contrast Adjustment
• Gain Control and Offset Adjustment