Filter 18.432M

The following is the circuit diagram of the Double Channel Adjustable Low Pass Filter LTC6603.

The LTC6603 is a highly integrated, low-power dual-channel low-pass filter designed for high-performance applications. It supports a serial interface for configuration and comes in a compact 24-pin 4mm x 4mm QFN package, making it ideal for space-constrained designs.

Key features include:

• Guaranteed phase and gain matching
• Programmable bandwidth up to 2.5MHz
• Programmable gain options: 0dB, 6dB, 12dB, or 24dB
• 9th-order linear phase response with differential input/output
• Rail-to-rail input and output for wide signal range
• Low noise performance: -145dBm/Hz (referred to input)
• Low distortion: -75dBc at 200kHz
• Simple pin programming or SPI interface with an external resistor
• Operating voltage range: 2.7V to 3.6V
• Input range from 0V to 5.5V
• Compact 4mm x 4mm QFN package

LTC6603 Package: QFN-24

The LTC6603 is widely used in various communication systems, including:

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

This device is particularly useful in applications where high linearity, low noise, and programmability are essential. Its flexible configuration options make it suitable for both commercial and military-grade communication systems.

(Editor: Circuit Diagram)