DS1857B-050

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Data Acquisition - Digital Potentiometers
The DS1857B-050 is a MOS/CMOS Digital Potentiometer with Nonvolatile Memory made by Maxim Integrated. It is ideal for applications that require a high degree of reliability, accuracy, and stability.This device is a programmable two-terminal, voltage controlled resistor (VCR) with an adjustable potentiometer wiper resistance, accuracy and temperature coefficient. It provides a range of 0 to 99.50 with a resolution of 0.05 and an accuracy of 0.1%. The device is programmed via a serial interface, allowing for control of the resistance value. This makes it ideal for applications such as amplifier and filter tuning, as well as for creating adjustable gain and offset settings for analog-to-digital converters.The DS1857B-050 is designed for use in applications with low-power requirements, and is optimized for low current consumption with a maximum power dissipation of 33 mW from a single 3 V power supply. It also features a wide voltage range, from 2.2 V to 5.5 V, allowing for flexibility in powering the device, as well as increased tolerance to overvoltage conditions.The features of the DS1857B-050 include an on-chip precision, temperature-compensated reference and system-level fault detection circuitry. It also incorporates two-time programmable nonvolatile memory (NVM) technology. This NVM allows the device to store a user-determined setting and recall it during power cycling. The device also features an adjustable write-protection mode that can be enabled to prevent accidental or unauthorized changes to the NVM.The main application fields for the DS1857B-050 include digital control for low power audio systems, tracking of temperature sensors, and adjustable reference voltage sources. The device is also suited for voltage-variable resistors and motor speed applications, as well as digital potentiometers.The working principle behind the DS1857B-050 is that it acts as a digitally controlled resistance. The resistance can be set from 0 to 99.50 Ω, with a resolution of 0.05 Ω and an accuracy of 0.1%. It utilizes a precision, temperature-compensated reference, and robust integrated ESD protection circuitry.The device is programmed via a SPI interface, connecting the device to a microcontroller. The resistance setting of the device can then be changed by a sequence of clock pulses, which sets the internal wiper resistance in the programmed value. The device is then typically coupled with a voltage source and a load to form an adjustable voltage divider network. This network is used to output a desirable voltage.In conclusion, the DS1857B-050 is a high performance, low power, digitally programmable potentiometer that is ideal for use in applications with low-power requirements. It incorporates NVM memory, which allows for the device to store and recall a user-determined setting. The DS1857B-050 provides a range of 0 to 99.50 with a resolution of 0.05 and an accuracy of 0.1%. It is suitable for various applications including low-power audio systems, motor speed applications, and adjustable voltage source.

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