X9438
Dual Digitally Controlled Potentiometer (XDCP™) with Operational Amplifier
Not Recommended for New Designs.Contact our Technical Support Center at 1-888-INTERSIL.
Typical Diagram
Key Features
- Two CMOS voltage operational amplifiers
- Two digitally controlled potentiometers
- Can be combined or used separately
- Amplifiers:
- Low voltage operation
- V+/V- = ±2.7V to ±5.5V
- Rail-to-rail CMOS performance
- 1MHz gain bandwidth product
- Digitally controlled potentiometers
- Dual 64 tap potentiometers
- Rtotal = 10kΩ
- 2-wire serial interface
- VCC = 2.7V to 5.5V
Description
The X9438 is a monolithic CMOS IC that incorporates two operational amplifiers and two nonvolatile digitally controlled potentiometers. The amplifiers are CMOS differential input voltage operational amplifiers with near rail-to-rail outputs. All pins for the two amplifiers are brought out of the package to allow combining them with the potentiometers, or using them as complete stand-alone amplifiers.
The digitally controlled potentiometers consist of a series string of 63 polycrystalline resistors that behave as standard integrated circuit resistors. The two-wire serial port, common to both pots, allows the user to program the connection of the wiper output to any of the resistor nodes in the series string. The wiper position is saved in the on board E2 memory to allow for nonvolatile restoration of the wiper position.
A wide variety of applications can be implemented using the potentiometers and the amplifiers. A typical application is to implement the amplifier as a wiper buffer in circuits that use the potentiometer as a voltage reference. The potentiometer can also be combined with the amplifier yielding a digitally programmable gain amplifier or programmable current source.
