LTC1569IS8-7#TRPBF

Overview

The Analog Devices LTC1569IS8-7#TRPBF is a 10th-order lowpass filter featuring linear phase and a root raised cosine amplitude response. It operates from single 3V to dual ±5V supplies, supporting cutoff frequencies up to 300kHz on a 5V supply. The device utilizes a single external resistor to set the internal oscillator frequency, which divides by 1, 4, or 16 via Pin 5 to program the cutoff frequency across seven octaves. Alternatively, an external clock can be applied with a fixed 32:1 ratio. Key electrical specifications include a maximum DC offset of 5mV, 80dB common-mode rejection at DC, and 80dB signal-to-noise ratio at 5V. The component is housed in an 8-lead SOIC package.

Feature Summary

• Linear phase and root raised cosine response for optimal pulse shaping
• Pin-programmable cutoff frequency using a single external resistor
• DC accurate performance with minimal output offset voltage
• Integrated power savings modes via internal divider settings

Applications

• Data communication filters for 3V operation
• Linear phase and phase matched filters for I/Q signal processing
• Anti-aliasing filters in data acquisition systems

Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging when sourcing this component. Confirm the IS grade designation corresponds to the industrial temperature range of -40°C to +85°C. Ensure the ordering information matches the exact part number to avoid confusion with commercial grades or different package styles.

Selection Notes

Select this component when high selectivity combined with linear phase is required for signal integrity. The single-resistor tuning simplifies design compared to traditional active filters. Consider the divide-by modes if lower power consumption is necessary, noting that these modes slightly alter the effective divide ratio based on supply voltage and temperature conditions.

Part Context

This part belongs to the LTC1569 family of sampled data filters. Unlike earlier models requiring external clocks, the LTC1569-7 integrates an oscillator controlled by one resistor. It serves as a successor to general-purpose active filters, offering higher order filtering in a compact surface-mount package suitable for modern dense circuit designs.

Replacement Considerations

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