LTC1040CSW#TRPBF

Overview

The LTC1040CSW#TRPBF is a dual micropower comparator in an 18-lead SO-Wide package. It operates on single supplies from 2.8V to 16V or split supplies from -2.8V to -8V. Key electrical parameters include a guaranteed maximum offset voltage of 0.75mV and a tracking error between input pairs of 0.1%. The device features a common mode range extending to both supply rails, with an input bias current of 0.3nA. Typical power consumption is 1.5mW at one sample per second.

Feature Summary

• Utilizes internally switched sampling techniques to achieve extremely low operating power levels while maintaining continuous output information.
• Features a unique dual differential input structure that allows for high accuracy comparisons independent of capacitor ratio errors when connected optimally.
• Includes a pulsed power (VP-P) output designed to drive external resistive networks during active comparison periods to minimize total system power dissipation.

Applications

• Window comparators with symmetric or independent limits
• Bang-bang controllers for heating and cooling systems
• Battery-powered remote sensing applications

Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging configuration. Confirm the CSW designation corresponds to the 18-lead plastic SO Wide package variant. Ensure compatibility with the required operating temperature range of -40°C to +85°C for the C grade. Cross-reference the manufacturer part number against official Analog Devices documentation to validate authenticity and revision status.

Selection Notes

Select this component when ultra-low power consumption is critical compared to standard continuous-power comparators. The dual differential inputs allow flexible configurations for minimizing tracking errors in precision applications. Consider the internal oscillator or external strobe options based on timing requirements. Verify that the source impedance does not exceed recommended limits without additional bypass capacitance to maintain accuracy.

Part Context

This device belongs to the LTC1040 family of micropower dual comparators manufactured using enhanced LTCMOS silicon gate process technology. It distinguishes itself from conventional linear comparators by employing sampled data techniques rather than continuous amplification. The family includes variants such as the CN (PDIP), MJ (CerDIP), and SW (SO-Wide) packages, offering flexibility for different mounting and thermal requirements.

Replacement Considerations

Consult Analog Devices marketing for parts specified with wider operating temperature ranges if the M grade is required. The N18 package may be considered as an alternate source for the PDIP variant. No direct cross-brand substitutes are confirmed in the provided documentation; verify pinout and electrical specifications carefully before substitution.

FAQ

How is the sampling frequency determined?

The sampling frequency can be controlled by an external strobe input or set by an internal oscillator. The internal oscillator frequency is established by an external RC network connected to the OSC pin, with REXT values typically ranging from 100kΩ to 10MΩ.

What is the function of the VP-P output?

The VP-P output provides pulsed power to drive external loads, such as resistive bridge networks, only during the comparator's active time. This feature significantly reduces total system power consumption by keeping external networks powered off during the majority of the sampling cycle.

How does the dual differential input structure affect accuracy?

The dual differential inputs convert voltages to charge using precision capacitors. Tracking error is caused by the ratio mismatch between these capacitors. Optimal connection methods can minimize this error, ensuring the switching point remains independent of the capacitor ratio within the guaranteed 0.1% tracking error specification.