DS1868S-10

Digital Potentiometers Overview

The DS1868S-10 is a dual digital potentiometer IC featuring two independent 256-position resistive elements with a nominal end-to-end resistance of 10 kΩ. It operates on a single +5V supply or ±3V supplies, consuming ultra-low power in a pumpless design. Control and data transfer are managed via a 3-wire serial interface (RST, CLK, DQ), allowing both setting and reading of wiper positions through an internal 17-bit I/O shift register. The device supports stacked configurations to double total resistance while maintaining resolution, and offers cascade capabilities for multi-device control over a single bus.

Digital Potentiometers Feature Summary

• Dual 256-position digitally controlled potentiometers with 10 kΩ nominal resistance
• 3-wire serial interface for read/write access to wiper positions
• Stacked configuration option to increase total resistance with 512 effective positions
• Cascade capability for controlling multiple devices from a single processor

Digital Potentiometers Applications

• Variable gain amplifier circuits
• Fixed gain attenuator applications
• Multi-device daisy-chained control systems

Digital Potentiometers Procurement Notes

Verify the specific package variant required, as the DS1868 series is available in 16-pin SOIC, 20-pin TSSOP, and 14-pin DIP packages. Confirm that the -10 suffix corresponds to the 10 kΩ resistance value. Ensure the design accounts for the random wiper position state upon power-up and implements appropriate initialization sequences via the serial interface.

Digital Potentiometers Selection Notes

Select this component when dual isolated potentiometers are needed within a single package. The 10 kΩ value suits applications requiring moderate impedance levels. Consider the stacked mode if higher resistance is needed without sacrificing the 256-step resolution per element. Verify that the system voltage aligns with the +5V or ±3V operating requirements and that the serial interface timing meets the 10 MHz maximum clock frequency specification.

Digital Potentiometers Part Context

The DS1868 belongs to the Maxim Integrated/Dallas Semiconductor family of solid-state digital potentiometers. It utilizes non-volatile memory principles implicitly through its ability to retain settings during operation, though explicit EEPROM retention details are not detailed in the provided text beyond standard operation. It serves as a direct replacement for mechanical potentiometers in space-constrained designs requiring digital adjustment.

Digital Potentiometers Replacement Considerations

Direct pin-compatible replacements may exist within the same DS1868 family but with different resistance values (e.g., DS1868-50 for 50 kΩ or DS1868-100 for 100 kΩ). When substituting, ensure the new part matches the required resistance tolerance and package type. No other specific cross-model substitutes are identified in the provided documentation.