ZTL431ASE5TA Integrated Circuits (ICs)

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ZTL431ASE5TA is a voltage reference manufactured by Texas Instruments and is part of the PMIC - Voltage Reference family. This particular device is characterized by a low temperature coefficient and a 0.005% reference voltage accuracy over line, load and time. In addition, it offers a precision output voltage of 4.31V, with a 5mA load current that can be scaled up if needed. It is designed to provide a stable voltage source for critical linear application, such as in data converters, communications, and other precision attenuators.

The ZTL431ASE5TA voltage reference device is composed of an integrated monolithic output voltage regulator with a bandgap reference core, two bipolar transistors (NPN and PNP) and two resistors connected in an adjustable configuration. The NPN transistor is connected from the signal ground to the base of the PNP transistor, with the base of the NPN transistor connected to the signal ground via a variable resistor. The collector of the NPN transistor is connected to the collector of the PNP transistor and to the reference voltage output. The emitter of the PNP transistor is connected to the signal ground and to the adjustable resistor, which is responsible for setting the output voltage.

The reference voltage output can be calculated by the following equation:

V_REF= V_BE + I_B * R

Where V_BE is the voltage between the base and emitter of the NPN transistor, I_B is the base current of the NPN transistor and R is the adjustable resistor. The voltage reference device is designed so that the output voltage is independent from the input voltage and is therefore not affected by changes in the power supply or load current.

The main purpose of the ZTL431ASE5TA voltage reference device is to set the reference voltage of the application accurately without changing the voltage signal applied to it. For example, the device can be used in voltage-controlled amplifiers and attenuators for setting the reference voltage. In addition, it can be used to regulate temperature control systems and as an adjustable voltage source for analog signal processing.

The ZTL431ASE5TA voltage reference device also provides an improved temperature stability. This is accomplished by incorporating an active temperature compensation circuitry which includes a thermistor and a voltage-to-resistance op-amp. The thermistor is connected in series with the adjustable resistor and compensates for the output voltage variation due to temperature changes in the operating environment. The voltage-to-resistance op-amp allows the compensation of the reference voltage against temperature.

The ZTL431ASE5TA voltage reference can be used in a wide range of applications. They are ideal for applications that require high precision and stability. They are especially suitable for use in power and data converters, attenuators, temperature control systems, as well as for voltage regulation and signal processing.

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