LT1568CGN#PBF

Overview

The LT1568CGN#PBF is a dual second-order active-RC filter building block housed in a 16-lead SSOP package. It integrates two low-noise operational amplifiers with trimmed internal capacitors and gain-bandwidth products to ensure consistent filter responses. The device supports cutoff frequencies from 200kHz to 10MHz using a single external resistor value for Butterworth configurations. It operates on a single 3V supply or dual supplies up to ±5V, featuring rail-to-rail inputs and outputs. Key electrical parameters include a typical supply current of 24mA at 3V, shutdown current of 0.5mA at 5V, and wideband output noise of 18mVRMS at a 1MHz cutoff.

Feature Summary

• Rail-to-rail input and output capabilities facilitate direct interfacing with high-speed analog-to-digital converters.
• Internal trimming of capacitors and amplifier gain-bandwidth products ensures matched and repeatable filter characteristics.
• Configurable as independent second-order sections or cascaded into a fourth-order filter with programmable response.
• Integrated shutdown mode significantly reduces power consumption when the device is inactive.

Applications

• Antialiasing and reconstruction filters in high-speed data communications systems
• Dual or I/Q channel filtering requiring matched second-order responses
• Single-ended to differential signal conversion for driving ADCs

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and temperature range. Ensure compatibility with required supply voltages and load conditions during integration. Cross-reference datasheet specifications for absolute maximum ratings to prevent device damage during operation.

Selection Notes

Select this component for applications requiring precise amplitude and phase matching between two filter channels. Verify that the required cutoff frequency falls within the 200kHz to 10MHz range supported by standard external resistor values. Consider the shutdown feature if power management during idle states is a system requirement.

Part Context

The LT1568 series serves as an integrated alternative to discrete RC active filters and LC modules. It consolidates dual filter stages into a single compact package, reducing board space and improving matching accuracy compared to separate components. The CGN variant specifically denotes the commercial temperature range version in the SSOP package.

Replacement Considerations

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