LTC1264-7CSW#PBF

Overview

The LTC1264-7CSW#PBF is a clock-tunable monolithic 8th order lowpass filter with linear passband phase and flat group delay. It features a cutoff frequency tuned via an external TTL or CMOS clock, supporting ratios of 25:1 or 50:1. The device achieves cutoff frequencies between 200kHz and 250kHz depending on operating conditions. It offers steeper roll-off than equivalent Bessel filters, attaining 28dB attenuation at twice the cutoff frequency. The component operates within a power supply range of ±2.375V to ±8V (total voltage up to 16.5V) and functions across an operating temperature range of –40°C to 85°C.

Feature Summary

• Provides linear phase response and flat group delay in the passband
• Exhibits steeper roll-off characteristics compared to equivalent 8th order Bessel filters
• Requires no external components for filter configuration
• Optimized for high-speed operation with transient response showing 5% overshoot and no ringing

Applications

• Data communication filters
• Time delay networks
• Phase matched filters

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing this component. Confirm that the CSW package designation corresponds to the 16-lead plastic SO Wide format required for your PCB layout. Ensure the ordering documentation matches the Analog Devices Inc. manufacturer identification to guarantee authenticity and traceability.

Selection Notes

Select this component when a steep roll-off combined with linear phase is required without external passive parts. Choose the 25:1 clock ratio for double-sampling to reduce aliasing risks, or the 50:1 ratio for lower cutoff frequencies relative to the clock speed. Verify that the available clock source meets the specified rise and fall time constraints to maintain signal integrity.

Part Context

This part belongs to the LTC1264-7 series of active filters. It is pin-compatible with the LTC1064-X series, facilitating potential design upgrades or replacements where similar form factors are needed. The device represents a specialized solution for applications demanding precise phase control alongside aggressive frequency attenuation.

Replacement Considerations

The LTC1264-7CJ is listed as an obsolete ceramic DIP alternative. Designers should consider the N14 package for alternate sources if transitioning from older inventory. No direct functional substitutes are explicitly confirmed in the provided documentation.