ISL22444
Quad Digitally Controlled Potentiometer (XDCP™), Low Noise, Low Power, SPI® Bus, 256 Taps
Key Features
- Four potentiometers in one package
- 256 resistor taps
- SPI serial interface with write/read capability
- Daisy Chain Configuration
- Shutdown mode
- Non-volatile EEPROM storage of wiper position
- 11 General Purpose non-volatile registers
- High reliability
- Endurance: 1,000,000 data changes per bit per register
- Register data retention: 50 years @ T ≤ +55°C
- Wiper resistance: 70Ω typical @ 1mA
- Standby current <4µA max
- Shutdown current <4µA max
- Dual power supply
- VCC = 2.25V to 5.5V
- V- = -2.25V to -5.5V
- 10kΩ, 50kΩ or 100kΩ total resistance
- Extended industrial temperature range: -40 to +125°C
- 20 Ld TSSOP or 20 Ld QFN
- Pb-free plus anneal product (RoHS compliant)
Description
The ISL22444 integrates four digitally controlled potentiometers (DCP), control logic and non-volatile memory on a monolithic CMOS integrated circuit.
The digitally controlled potentiometers are implemented with a combination of resistor elements and CMOS switches. The wipers position is controlled by the user through the SPI serial interface. Each potentiometer has an associated volatile Wiper Register (WRi) and a non-volatile Initial Value Register (IVRi) that can be directly written to and read by the user. The contents of the WRi control the position of the wiper. At power-up the device recalls the contents of the DCP's IVRi to the corresponding WRi.
The ISL22444 also has 11 General Purpose non-volatile registers that can be used as storage of lookup table for multiple wiper position or any other valuable information. The ISL22444 features a dual supply that is beneficial for applications requiring a bipolar range for DCP terminals between V- and VCC.
Each DCP can be used as three-terminal potentiometer or as two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.
