MAX4145ESD+

Overview

The MAX4145ESD+ is a high-speed, low-distortion differential line receiver manufactured by Analog Devices Inc./Maxim Integrated. It utilizes a three op-amp instrumentation amplifier architecture with fully symmetrical differential inputs and a single-ended output. The device operates from ±5V power supplies and features an external gain-setting resistor for closed-loop gains ranging from +1V/V to +10V/V. Key electrical specifications include a -3dB bandwidth of 180MHz, a slew rate of 600V/µs, and a common-mode rejection ratio (CMR) of 75dB at 10MHz. It is housed in a 14-pin SO package and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Utilizes a three op-amp instrumentation amplifier architecture for fully symmetrical differential inputs and single-ended output.
• Features external gain selection capability via a single resistor, optimized for gains between +1V/V and +10V/V.
• Incorporates laser-trimmed, matched thin-film resistors to deliver high common-mode rejection performance.
• Employs current-feedback techniques to achieve high bandwidth and fast slew rates while maintaining low distortion.

Applications

• Differential to Single-Ended Conversion
• Twisted-Pair to Coaxial Converter
• High-Speed Instrumentation Amplifier
• Data Acquisition
• Medical Instrumentation

Procurement Notes

Verify the component authenticity by checking the manufacturer marking against official datasheet pinout diagrams. Confirm the suffix 'ESD+' indicates the standard lead-free RoHS-compliant variant in the 14-SO package. Ensure the supply voltage rails match the required ±5V operation before integration into the circuit design.

Selection Notes

Select this model when a fixed internal gain is insufficient and external programmability between +1V/V and +10V/V is required. Compare it against the MAX4144 if a fixed +2V/V gain is acceptable, or the MAX4146 if higher gains exceeding +10V/V are necessary. Consider the specific bandwidth and noise requirements relative to the chosen external gain setting.

Part Context

This component belongs to the MAX4144/MAX4145/MAX4146 family of high-speed differential line receivers. While all members share the same core instrumentation amplifier architecture and package options, they differ primarily in their gain configurations. The MAX4145 specifically bridges the gap between the fixed-gain MAX4144 and the high-gain MAX4146.

Replacement Considerations

Public confirmed substitute part numbers: MAX4144ESD+, MAX4146ESD+. These variants share the same physical footprint and basic functionality but offer different fixed or variable gain ranges.

FAQ

How is the closed-loop gain configured for the MAX4145?

The closed-loop gain is set using a single external resistor connected between the RG+ and RG- pins. The gain formula is AV = 1 + (1.4kΩ/RG), allowing values from +1V/V to +10V/V.

What is the maximum output current drive capability?

The device can drive an output current of up to ±120mA, which provides protection against short-circuit conditions to ground for moderate durations.

Does the MAX4145 support a shutdown mode?

Yes, the SHDN pin allows the device to enter a low-power shutdown mode. A logic high disables the amplifier, resulting in a high-impedance output state.