LT1027ECS8-5#TRPBF Integrated Circuits (ICs)

Noise - 0.1Hz to 10Hz:	3µVp-p
Base Part Number:	LT1027
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Current - Supply:	3.5mA
Voltage - Input:	8 V ~ 40 V
Noise - 10Hz to 10kHz:	10µVrms
Series:	--
Temperature Coefficient:	7.5ppm/°C
Tolerance:	±0.1%
Current - Output:	15mA
Voltage - Output (Min/Fixed):	5V
Output Type:	Fixed
Reference Type:	Series
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LT1027ECS8-5#TRPBF is a three-terminal adjustable voltage reference for precision applications such as high-accuracy power-supply-monitoring and current-loop-control systems. The device is well suited for systems where the output voltage must remain highly stable during power-supply-switching transients and in the presence of changing temperature and load conditions.The voltage reference serves as a basis for incoming sensitivity, reference input and offset adjustments, providing precision vs. temperature over the full industrial temperature range. When connected to a stable regulator or amplifier, very accurate voltages can be obtained. It is ideal for high-accuracy instrumentation, panel-meter and DAC references.

Application Field

The LT1027ECS8-5#TRPBF application field includes high-accuracy power-supply-monitoring applications; current-loop-control systems; precision vs temperature over full temperature range; adjustable-gate-bias-and-reference circuits; and analog-signal-sampling, voltage-ramping and other low-distortion/low-noise applications.The chip is specifically ideal for portable instrumentation, including portable oscilloscopes and data loggers, enabling the efficient monitoring and control of the voltage from a battery or other external sources. The chip only requires a few external components to provide precise, low-noise references typically used for field-programming DACs and ADCs, for on-site answer checking, and for performance assurance.

Working Principle

The circuit diagram of the adjustable voltage reference LT1027ECS8-5#TRPBF is shown in Figure 1. The device is a 3-terminal adjustable voltage reference. Its working principle of operation is illustrated in Figure 2.Figure 1. LT1027ECS8-5#TRPBF circuit diagram.Figure 2. Working principle of LT1027ECS8-5#TRPBF.The device contains a band-gap voltage reference which provides a stable output voltage. The reference voltage is connected between the output pin (VREF) and the ADJ terminal. When a current flows through this voltage reference from the output pin to the ADJ terminal, the voltage across the reference, VREF, is reduced by the amount of the reference current times the voltage reference impedance. This reduction in voltage at the output is sensed by an error amplifier which has its non-inverting input connected to the output through the ADJ resistor. The output of the error amplifier is feed back to the reference and the appropriate current is established to produce the output voltage set by the potentiometer connected between the ADJ and GND terminals.The output voltage of the LT1027ECS8-5#TRPBF is externally adjustable over the range of 0.2V to 28V by controlling the value of the potentiometer. The LT1027ECS8-5#TRPBF has a typical offset voltage of 2.5 mV, which is independent of the output voltage setting and a temperature coefficient of 10ppm/° C. This temperature coefficient is a combination of the intrinsic temperature coefficient of the reference and the temperature coefficient of the ADJ resistor.

Conclusion

The LT1027ECS8-5#TRPBF is a low noise, 3-terminal adjustable voltage reference designed for precision applications such as high-accuracy power-supply-monitoring and current-loop-control systems. Its application field includes high-accuracy power-supply-monitoring, current-loop-control systems, precision vs temperature over full temperature range, adjustable-gate-bias-and-reference circuits, and analog-signal-sampling, voltage-ramping and other low-distortion/low-noise applications. Its working principle is that the device contains a band-gap voltage reference which provides a stable output voltage and is able to adjust the output voltage in the range of 0.2 V to 28 V.

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