DS1844-100

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Introduction

The digitally controlled trimmer potentiometer, LTC1684-100, is an integrated passive component developed by Linear Technology. This multi-turn, adjustable trimmer potentiometer is controlled by a pulse-width-modulated (PWM) voltage signal. With up to 128 steps of resolution and up to 32 full turns of range, the LTC1684-100 is suitable for applications requiring precise, low-drift trimming or up to 32 full turns of manual adjustment, such as audio-level trimming and bias control. The DS1844-100 is a dual-channel, digitally controlled trimmer potentiometer that leverages the same Integrated Circuit (IC) technology as the LTC1684-100, but offers twice the channel capability in a single package. With two discrete channels as well as up to 32 full turns and 128 steps of resolution, the DS1844-100 is suitable for applications such as stereo level trimming and automated multi-channel application bias trimming.

Application Field

The DS1844-100 is designed to offer precision control and calibration. It can be used in a variety of applications within the audio, industrial, automotive and medical industries, among others. Examples range from bias control and level trimming for stereo audio systems to trimming multiple channels within automated camera systems or medical applications.The DS1844-100 is an excellent choice when used to create user-adjustable gains and attenuation or as an adjustable bias control. It provides full adjustability with up to 32 full turns and 128 steps of resolution. This is extremely useful when such precision control is required and manual adjustment is limited or inconvenient. The DS1844-100 is also ideal for applications requiring a mix of manual adjustment and automation. With the two independent control channels, adjustments can be made on one or both channels either manually or electronically. This saves time in manufacturing and allows for quick field trimming or automated recalibration. For applications where space is critical, the DS1844-100 is an excellent choice. By combining two potentiometers in a single package, the DS1844-100 allows for up to twice the channel capability as compared to the LTC1684-100, in the same amount of space.

Working Principle

The DS1844-100 is an integrated passive component designed to control and calibrate with high resolution and accuracy. It employs an internal wiper resistance function which, when connected to a voltage source and controlled by a pulse-width-modulated (PWM) signal, provides precise adjustment of the wiper position. Operating on low-voltage power, the DS1844-100 can be used as an adjustable AC-coupled voltage divider or an adjustable DC-coupled voltage divider. Voltage is applied to the two inputs of the DS1844-100 in order to trim the output voltage.A PWM operating voltage applied to the DS44-100 adjusts the wiper position with up to 32 full turns and 128 steps of resolution. When the voltage is low, the wiper remains stationary and will not move. When the voltage is high, the wiper is propelled to the next position. The DS1844-100 senses the exact wiper position and provides automation when the voltage is high. The DS1844-100 allows for dual control of the potentiometer. While one channel is driven by a PWM signal, the other allows for manual adjustment. Both channels can be combined to allow for more accurate control and calibration. The DS1844-100 is designed for use in temperature-sensitive applications and can maintain accuracy within 2℃. It also offers excellent long-term stability, providing up to 1,000 hours of operation with no degradation in performance. It is also extremely cost-effective, as it reduces the cost of stocking multiple components or requiring multiple calibrations.

Conclusion

The DS1844-100 is a dual-channel, digitally controlled trimmer potentiometer that is suitable for a wide range of applications. With up to 32 full turns and 128 steps of resolution, it provides precise and repeatable adjustments for audio-level trimming and bias control, among other applications. It also offers excellent long-term stability, cost-effectiveness and precise control, making it the ideal choice for applications requiring precise calibration.

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