Series:	XDCP™
Packaging:	Tube
Part Status:	Obsolete
Taper:	Linear
Configuration:	Potentiometer
Number of Circuits:	4
Number of Taps:	128
Resistance (Ohms):	10k
Interface:	SPI
Memory Type:	Non-Volatile
Voltage - Supply:	2.7 V ~ 5.5 V
Features:	--
Tolerance:	±20%
Temperature Coefficient (Typ):	±50 ppm/°C
Resistance - Wiper (Ohms) (Typ):	70
Operating Temperature:	-40°C ~ 125°C
Package / Case:	20-WFQFN Exposed Pad
Supplier Device Package:	20-TQFN (4x4)
Base Part Number:	ISL22446

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Introduction

The ISL22446WFRT20Z is a digital potentiometer (Digipot) used in the data acquisition industry. It is a variable resistor that can be programmed and adjusted digitally, with its resistance adjustable from 0 to 10K ohms in 16 steps. The specified resistance range can be adjusted with very high accuracy without the need for manual adjustments. The device also has low noise characteristics, a remarkably low on-resistance, and low temperature coefficient.

Application Field

The ISL22446WFRT20Z Digipot can be used in many electronic applications such as digital-to-analog converters (DACs), motor control circuits, touch screen adjusters, loop gain setting, and programmable voltage regulators. It is also used in devices such as thermometers, accelerometers, amplifiers, digital light meters, and photovoltaic cells. The device is particularly suitable as a programmable gain amplifier (PGA), because of its low on-resistance and its ability to be reprogrammed on the fly. It is also useful for medical equipment such as transducers, ECG monitors, and blood pressure meters, since these devices require a precisely adjustable gain to measure the accurate signals.

Working Principle

The ISL22446WFRT20Z Digipot has a low resistance (1 mohm) and is driven by an inverting amplifier unit. It consists of three potentiometers connected in series, with each layer having a reference voltage applied to it. The resistance of each potentiometer is controlled by switching current on a transistor, which creates a voltage drop across the resistor. The resistance of each layer can be programmed and adjusted independently, allowing a wide range of gain settings. In addition, the resistance of each layer can be adjusted in 16 increments, giving a total of 16^3 = 4096 gain settings. The device has low noise characteristics, a low on-resistance, and low temperature coefficient, which makes it highly suitable for data acquisition applications. In addition, the device can be powered by either a 5V or a 3V source, allowing for flexibility in its use.

Conclusion

The ISL22446WFRT20Z Digipot is a versatile and highly accurate digital potentiometer that is suitable for a range of data acquisition applications. It has a low resistance, low noise characteristics, and low temperature coefficient all of which make it suitable for use as a PGA. In addition, it also offers a wide range of gain settings due to its ability to be programmed and adjusted independently.

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