DS1844S-100+

Digital Potentiometers Overview

The DS1844S-100+ is a quad digital potentiometer featuring four independent, digitally controlled linear potentiometers with 64 positions each. It supports two interface options: a 5-wire serial I/O shift register and a 2-wire addressable bus. The device operates on a supply voltage of 2.7V to 5.5V within an industrial temperature range of -40°C to +85°C. Each potentiometer consists of 63 equi-resistive sections, providing three accessible terminals per channel. The wiper position is selected via an 8-bit register value, allowing for direct placement on the resistor ladder.

Digital Potentiometers Feature Summary

• Four independent 64-position linear potentiometers
• Dual interface support: 5-wire serial or 2-wire addressable
• Standard 100 kΩ resistance value (DS1844-100 variant)
• Industrial operating temperature range (-40°C to +85°C)

Digital Potentiometers Applications

• Volume control in audio equipment
• Gain adjustment in instrumentation amplifiers
• Voltage reference trimming
• Programmable filter frequency setting

Digital Potentiometers Procurement Notes

Verify package type availability as the DS1844 series includes DIP, SOIC, and TSSOP options. Confirm RoHS compliance status for specific manufacturing lots. Check lead times due to potential discontinuation of older variants. Ensure ordering suffix matches required interface pin configuration if PS pin functionality varies by package revision.

Digital Potentiometers Selection Notes

Select the DS1844S-100+ when four independent variable resistors are needed with digital control. Choose this part over volatile alternatives if non-volatile storage is not required, as it powers up to mid-tap. Consider the 2-wire interface for space-constrained designs using standard I2C-like protocols, or the 5-wire interface for simpler synchronous control. Verify that the 100 kΩ end-to-end resistance meets circuit impedance requirements.

Digital Potentiometers Part Context

The DS1844 is part of Maxim Integrated's (now Analog Devices) Dallastat family of digital potentiometers. This specific model represents the 100 kΩ version of the quad-channel series. It serves as a solid-state replacement for mechanical potentiometers in applications requiring remote adjustment or automated calibration. The 'S' suffix typically denotes the SOIC package variant.

Digital Potentiometers Replacement Considerations

Direct replacements include other DS1844 variants with different resistance values (e.g., DS1844S-010+, DS1844S-050+) if resistance scaling is acceptable. For single-channel needs, the DS1846 may be considered. Ensure any substitute maintains the same package footprint and voltage range.