LS7193S10

Overview

The LS7193S10 is a three-terminal digital potentiometer featuring an integrated incremental encoder interface and SPI communication. It provides 64-position wiper control via quadrature clock inputs (A and B) with built-in debounce circuitry, suitable for mechanical encoders or push-button switches. The device operates on a 3V to 5V supply and includes an SPI bus for host MCU presetting and status reading. Available in SOIC-8, SOIC-14, and TSSOP-14 packages, it supports resistor values of 20K, 50K, and 100K, qualifying for automotive temperature ranges (-40°C to +125°C).

Feature Summary

• 64-position wiper control with adjustable debounce for mechanical encoder/switch inputs.
• Quadrature clock interface for incremental encoders combined with SPI bus for MCU communication.
• Supply voltage range of 3V to 5V with low power consumption (7µA typical at 3V).
• Available in 20K, 50K, and 100K resistance versions across multiple package types.

Applications

• Replacement for mechanical potentiometers in industrial controls.
• Remote adjustment of instrumentation gain, offset, time constants, and line impedance matching.
• Audio equipment volume control systems.

Procurement Notes

Verify the ordering suffix against the manufacturer's format LS71XX-PP-RR. The 'S' indicates a SOIC package, while '10' specifies the 100K resistor value. Confirm if the specific variant requires tape and reel delivery by checking for a '-TR' suffix. Ensure the selected package matches the PCB footprint requirements for SOIC-8, SOIC-14, or TSSOP-14.

Selection Notes

Select the LS7193 variant specifically when quadrature decoding from incremental encoders is required, as opposed to non-quadrature up/down clocks used in other models. Choose the 100K version for higher impedance applications. Ensure the design accommodates the external capacitor on the CAP pin to set the debounce oscillator frequency according to the supply voltage.

Part Context

The LS7193 belongs to the LS719x family of digital potentiometers from LSI Computer Systems, Inc. This series integrates a 6-bit up/down counter and analog multiplexer to simulate a mechanical potentiometer. The LS7193 specifically distinguishes itself by supporting quadrature mode inputs with hardware debouncing, differentiating it from the LS7192 which lacks debouncing for faster electronic clock sources.

Replacement Considerations

Direct functional replacements within the same family include the LS7190, which shares identical electrical characteristics and pinouts but may differ in package availability. Verify that any substitute component supports the required 100K resistance value and quadrature input processing capabilities.