ISL22424

Dual Digitally Controlled Potentiometer (XDCP™), Low Noise, Low Power, SPI® Bus, 256 Taps

OVERVIEW

The ISL22424 integrates two 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 position of the wiper 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 ISL22424 also has 13 General Purpose non-volatile registers that can be used as storage of lookup table for multiple wiper position or any other valuable information. The ISL22424 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.

KEY FEATURES

  • Two 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
  • 13 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: -40ºC to +125ºC
  • 14 Ld TSSOP or 16 Ld QFN
  • Pb-free plus anneal product (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL22424
Basic Information
Production Status
Mass Production
# of Devices/ Channels
2
# of Taps
256
Memory Type
Nonvolatile
Bus/Output Interface
SPI
Resistance Options (kΩ)
10
Supply Voltage Vcc (Min) (V)
2.25
Supply Voltage Vcc (Max) (V)
5.5
Supply Current Icc
0.5 µA
Resistance Taper
Linear
VL Min. Terminal Voltage
-5.5 V
VL Max. Terminal Voltage
5.5 V
Wiper Current (mA)
3
Wiper Resistance (Ω)
70
Dual Supply Range (V)
-2.25 to -5.5
Max Operating Temperature
125 °C
End-to-End Temperature Coefficient (ppm/øC)
45
Middlepoint Ratiometric Tempco
4
Features
Daisy Chainable to minimize # I/0 pins on microcontroller, dual supply required
Qualification Level
Standard
Supply Voltage Vcc Range (V)
2.25 to 5.5
Can Sample
YES
Temperature Range
-40 to +125

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