X9438

Temperature under bias ................... -65 to +135
Storage temperature ........................ -65 to +150
Voltage on SDA, SCL or any address
input with respect to V_SS ......................... -1V to +7V
Voltage on any V+ (referenced to V_SS) ............... +7V
Voltage on any V- (referenced to V_SS) ................. -7V
(V+) - (V-) .............................................................10V
Any R_H ....................................................................V+
Any R_L ..............................................................VLead
temperature (soldering, 10 seconds)................ 300

Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only; functional operation of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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 of X9438 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 X9438 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 of X9438 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.