LT1568IGN#PBF

Overview

The LT1568IGN#PBF is a high-frequency active RC filter building block manufactured by Analog Devices Inc. It integrates two matched second-order lowpass filters with rail-to-rail inputs and outputs in a 16-lead SSOP package. The internal capacitors are trimmed to –0.75%, and the gain-bandwidth product of the low-noise op amps is calibrated for consistent responses. Operating from a single 3V (2.7V min) to ±5V supply, it supports cutoff frequencies up to 10MHz. Key electrical parameters include an SNR of 92dB at 2MHz, THD of –84dB, and a shutdown current of approximately 0.5mA on a 5V supply.

Feature Summary

• Provides a pair of matched 2-pole Butterworth lowpass filters with unity gain suitable for I/Q channels using a single resistor value.
• Features extremely flexible configurations allowing different frequency responses or gains through unequal external resistor values.
• Supports single-ended to differential signal conversion for directly driving high-speed A/D converters.

Applications

• Antialiasing and reconstruction filters
• Dual or I-and-Q channels requiring two matched 2nd order filters in one package
• Single-ended to differential conversion
• Video signal processing

Procurement Notes

Verify the specific suffix IGN#PBF against the manufacturer's official documentation to confirm the industrial temperature range and plastic SSOP packaging. Ensure that ordering information aligns with the latest datasheet specifications before procurement.

Selection Notes

Select this component when designing high-speed data communications systems requiring antialiasing or channel filtering. It is ideal for applications needing dual matched filters or single-ended to differential conversion with low noise performance.

Part Context

The LT1568 replaces discrete RC active filters and LC filter modules. It is part of the LT series designed for easy implementation of high-frequency filtering functions with minimal external components.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the LT1568 achieve consistent filter responses?

The internal capacitors of the IC and the GBW product of the internal low noise op amps are trimmed such that consistent and repeatable filter responses can be achieved.

What is the power consumption during shutdown mode?

The shutdown mode reduces supply current to approximately 0.5mA on a 5V supply.

Can the LT1568 be configured as a bandpass filter?

Yes, the LT1568 can be connected as a bandpass filter by using unequal-valued external resistors.