LTC1043CN#PBF

Specialized ICS Overview

The LTC1043CN#PBF is a monolithic, charge-balanced, dual switched capacitor instrumentation building block manufactured by Analog Devices Inc. It operates from a supply voltage of 3V to 18V and features two independent switch sections controlled by a single non-overlapping clock. The internal oscillator frequency can be adjusted via an external capacitor on Pin 16 or driven by an external CMOS clock up to 5MHz. Key electrical parameters include a typical power supply current of 0.7mA (with COSC connected), ON resistance ranging from 240Ω to 700Ω depending on supply voltage, and a DC common-mode rejection ratio (CMRR) of 120dB. The device is housed in an 18-lead PDIP package.

Specialized ICS Feature Summary

• Dual precision instrumentation switched-capacitor building block with break-before-make switching action
• Internal oscillator adjustable from approximately 20kHz to 190kHz using an external capacitor, or externally driven up to 5MHz
• Ultra-high CMRR exceeding 120dB at DC without requiring precise external component matching
• Charge-balanced switches minimize hold step errors in sample-and-hold applications

Specialized ICS Applications

• Instrumentation amplifiers with high common-mode rejection
• Precision voltage inverters, multipliers, and dividers
• Voltage-to-frequency (V-F) and frequency-to-voltage (F-V) converters
• Sample-and-hold circuits with low hold step error
• Switched-capacitor filters and modulators

Specialized ICS Procurement Notes

Verify the specific ordering suffix CN#PBF corresponds to the 18-lead PDIP package and commercial temperature range (-40°C to +85°C). Confirm that the #PBF designation indicates lead-free compliance. Ensure the source document explicitly lists this exact part number as available for procurement, as availability status may vary by region and distributor.

Specialized ICS Selection Notes

Select the LTC1043CN#PBF when board-level switched-capacitor functions are required without discrete timing networks. Choose this part over surface mount variants if through-hole mounting is necessary for the application environment. Consider the maximum operating frequency limits and supply voltage requirements (3V to 18V) when designing the clock circuitry and power rails.

Specialized ICS Part Context

The LTC1043 is part of the Linear Technology (now Analog Devices) family of switched-capacitor building blocks. It utilizes enhanced LTCMOS silicon gate process technology. The 'CN' suffix denotes the 18-lead plastic DIP package, while 'LTC1043M' refers to an obsolete military-grade variant with extended temperature ranges. This component enables complex analog signal processing functions using only external capacitors.

Specialized ICS Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified documentation. The datasheet notes that the LTC1043MD package is obsolete and suggests considering the N18 package as an alternate source for similar form factors.