| # of Devices/ Channels | 4 |
| # of Taps | 256 |
| Memory Type | Non-Volatile |
| Bus Interface Type | SPI |
| Resistance Options (kΩ) | 50, 100 |
| VCC Range (V) | 2.7 to 5.5 |
| VCC (min) (V) | 2.7 |
| VCC (max) (V) | 5.5 |
| DCP Dual Supply Range (V) | |
| DCP Single Supply Range (V) | N/A |
| Resistance Taper | Linear |
| Wiper Current (mA) | 4.4 |
| Wiper Resistance (Ω) | 200 |
| Supply Current (μA) | 50 |
| Max Operating Temp (°C) | 85 |
| End-to-End Tempco (ppm/°C) | 300 |
| Middlepoint Ratiometric Tempco | 0 |
| VL min. terminal voltage (V) | 0 |
| VH max. terminal voltage (V) | 5.5 |
The X9251 integrates four digitally controlled potentiometers (xDCP) on a monolithic CMOS integrated circuit.
The digitally controlled potentiometers are imple-mented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the SPI bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and four non-volatile Data Registers that can be directly written to and read by the user. The content of the WCR controls the position of the wiper. At power-up, the device recalls the content of the default Data Registers of each DCP (DR00, DR10, DR20, and DR30) to the corresponding WCR.
The xDCP can be used as a three-terminal potentiometer or as a two terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.