LTC6253HMS8#PBF

Current - Input Bias:	1.4µA
Base Part Number:	LTC6253
Supplier Device Package:	8-MSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply, Single/Dual (±):	2.5 V ~ 5.25 V, ±1.25 V ~ 2.625 V
Current - Supply:	4.25mA
Voltage - Input Offset:	100µV
Series:	--
-3db Bandwidth:	400MHz
Gain Bandwidth Product:	720MHz
Slew Rate:	280 V/µs
Output Type:	Rail-to-Rail
Number of Circuits:	2
Amplifier Type:	General Purpose
Part Status:	Active
Packaging:	Tube

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Introduction

The LTC6253HMS8#PBF is a versatile and high-performance instrumentation amplifier. It is ideal for use in the instrumentation, medical and industrial markets. The device has two high-performance integrated components in a very small package, the instrumentation amplifier (IA) and buffer amplifier (BA). The IA provides wide bandwidth, low distortion and excellent common-mode rejection ratio (CMRR). The BA ensures a high voltage output swing and good current drive capability.

Features

The LTC6253HMS8#PBF offers excellent performance and features including:

• Low noise, wide bandwidth IA with CMRR up to 80 dB
• Low differential gain and phase for linear systems
• High current and voltage output capability for buffer amplifier
• Slew rate and current output ideally suited for driving external devices
• Excellent common-mode rejection of ac ground noise
• Compact 8-pin TSSOP package
• 3.3V or 5V single supply

Applications

The LTC6253HMS8#PBF is ideal for a wide range of linear applications in the industrial, medical, instrumentation and automotive markets. It is a great choice for instrumentation and medical devices including pulse oximeter circuits, imaging systems, pump controllers, spectroradiometers, heat monitors, and echocardiograms. The device is suitable for measuring signals from high impedance transducers and for driving long cables and capacitive loads.

Working Principle

The LTC6253HMS8#PBF combines the IA and BA on a single chip to provide a very flexible linear amplifier. The IA acts as a high impedance differential amplifier, providing superior linearity, bandwidth, and common mode rejection. The BA acts as a low-impedance voltage source, providing low distortion and high output swing. The IA circuit has two inputs, an inverting input (V-) and a non-inverting input (V+). When a differential input voltage is applied to these two inputs, the gain of the amplifier is determined by the ratio of the resistors connected to the feedback pin (FB_). The FB_ pin is internally connected to the non-inverting input of the IA. This connection allows the non-inverting input to see only the differential input voltage. The CMRR of the IA is determined by the ratio of the resistive feedback divider network and the differential gain. The maximum CMRR of the IA is 80 dB. The IA output is connected to the input of the buffer amplifier. The buffer amplifier is a rail-to-rail output amplifier. The slew rate and current output of the buffer amplifier are ideally suited for driving external devices. The voltage output swing is ± 5V with respect to VREF, which is connected to the power supply.

Conclusion

The LTC6253HMS8#PBF is an ideal choice for a wide range of linear applications in the industrial, medical, instrumentation and automotive markets. It offers excellent performance, low noise, wide bandwidth, high CMRR and excellent common-mode rejection of ac ground noise. The device has two integrated components, an IA and a BA, and is available in an 8-pin TSSOP package. The IA provides the wide bandwidth needed for linear systems and the BA ensures a high voltage output swing and good current drive capability.

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