LTC6603IUF#PBF

Overview

The LTC6603IUF#PBF is a dual, matched, programmable lowpass filter manufactured by Analog Devices Inc. It operates from supply voltages of 2.7V to 3.6V for analog and digital sections, with an input voltage range up to 5.5V. The device features differential, rail-to-rail inputs and outputs, providing a 9th-order linear phase response. The cutoff frequency is programmable via a single external resistor or an external clock, covering a range exceeding six octaves. Filter gain can be set to 1, 2, 4, or 16 (0dB, 6dB, 12dB, or 24dB). It includes a low power shutdown mode controlled via a serial interface and is housed in a 24-lead, 4mm × 4mm 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 with a 9th-order linear phase response
• Differential, rail-to-rail inputs and outputs for simple system interfacing
• Low noise performance with input-referred noise as low as –145dBm/Hz

Applications

• 2.5MHz I and Q Lowpass Filter and Dual ADC driver circuits
• Small and low cost base stations including IDEN, PHS, TD-SCDMA, CDMA2000, WCDMA, and UMTS
• 802.11x receivers
• Low cost repeaters, radio links, and modems

Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and tube packaging when sourcing. Confirm the IUF variant meets the required -40°C to 85°C operating temperature range for your application environment. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability.

Selection Notes

Select the LTC6603IUF#PBF for designs requiring precise phase matching between two filter channels. Ensure the external RBIAS resistor value falls within the 30.9kΩ to 200kΩ range to maintain oscillator accuracy. Verify that the system supply voltage remains within the 2.7V to 3.6V limit for V+A and V+D pins to guarantee specified electrical characteristics.

Part Context

The LTC6603 belongs to Analog Devices' family of sampled data filters designed for communications systems. Unlike traditional active filters, it does not require an external clock for basic operation, simplifying board layout. The device integrates both filter networks and control logic into a compact QFN package, reducing component count compared to discrete solutions.

Replacement Considerations

LTC6603CUF#PBF: Same functional specifications but rated for 0°C to 70°C operating temperature range.