LTC6603CUF#TRPBF

Overview

The LTC6603CUF#TRPBF is a dual, matched, programmable lowpass filter designed for communications receivers and transmitters. It operates from a single supply voltage ranging from 2.7V to 3.6V on analog and digital supplies, with an input supply up to 5.5V. The device features differential, rail-to-rail inputs and outputs, ensuring simple interfacing. Key electrical parameters include a programmable bandwidth up to 2.5MHz, gain settings of 0dB, 6dB, 12dB, or 24dB, and a 9th-order linear phase response. Input referred noise is specified at -145dBm/Hz at 24dB gain. The cutoff frequency accuracy is within ±3.5% when self-clocked using an external resistor. The component is housed in a 24-lead 4mm × 4mm plastic QFN package.

Feature Summary

• Dual matched channels with guaranteed phase and gain matching specifications suitable for I/Q applications
• Programmable bandwidth up to 2.5MHz and gain settings selectable via pin control or serial interface
• Low noise performance with -145dBm/Hz input-referred noise density at maximum gain
• Flexible clocking options allowing internal oscillator programming via a single external resistor or external clock input

Applications

• Small or low cost base stations including IDEN, PHS, TD-SCDMA, CDMA2000, WCDMA, and UMTS systems
• Low cost repeaters, radio links, and modems
• 802.11x receivers
• JTRS (Joint Tactical Radio System)

Procurement Notes

Verify the specific ordering suffix TRPBF indicates tape and reel packaging when sourcing this component. Confirm that the CU suffix corresponds to the commercial temperature range of 0°C to 70°C rather than the industrial grade. Ensure the source documentation matches the Analog Devices datasheet for the LTC6603 family to validate pin compatibility and electrical characteristics before integration into the design.

Selection Notes

Select the LTC6603CUF#TRPBF when designing communication systems requiring precise phase and gain matching between two filter channels. This part is appropriate for applications needing programmable bandwidths up to 2.5MHz with low distortion and noise. Consider the 24-lead QFN package constraints and the requirement for a precision external resistor to set the cutoff frequency accurately. Verify that the operating temperature range of 0°C to 70°C meets the environmental requirements of the target application.

Part Context

The LTC6603 is part of Analog Devices' portfolio of signal processing components tailored for wireless communications. It serves as a specialized solution for baseband filtering in transceivers where channel matching is critical. The device integrates both filter channels and control logic into a compact footprint, reducing the component count compared to discrete solutions. It complements other Analog Devices RF and baseband ICs in modern cellular and Wi-Fi infrastructure designs.

Replacement Considerations

The LTC6603IUF#TRPBF is a verified substitute offering the same electrical specifications but with an extended operating temperature range of –40°C to 85°C. Both parts share identical pinouts and functionality, allowing for direct replacement if the application requires operation below 0°C. No functional changes are required when swapping between the C and I grades.