LTC1569IS8-7#PBF

Overview

The Analog Devices LTC1569IS8-7#PBF is a 10th-order linear phase lowpass filter in an SO-8 package. It features a root raised cosine amplitude response and operates from single 3V to dual ±5V supplies. The cutoff frequency is programmable via a single external resistor or an external clock, with internal dividers of 1, 4, or 16 allowing seven octaves of tuning. Key electrical parameters include a maximum DC offset of 5mV, 80dB CMRR at DC, and 80dB signal-to-noise ratio at VS = 5V. The device supports differential or single-ended inputs and includes power-saving modes.

Feature Summary

• Linear phase and root raised cosine response for optimal pulse shaping
• Cutoff frequency set by one external resistor or external clock
• DC accurate with 5mV maximum offset voltage
• Low power operation with divide-by-4 and divide-by-16 modes

Applications

• Data communication filters for 3V operation
• Linear phase and phase matched filters for I/Q signal processing
• Pin programmable cutoff frequency lowpass filters

Procurement Notes

Verify the suffix #PBF indicates lead-free compliance and RoHS adherence. Confirm the IS8 variant meets the -40°C to +85°C industrial temperature range requirements. Ensure the ordering information matches the specific package and grade needed for the design.

Selection Notes

Select this component when high selectivity and linear phase are required in a compact surface-mount package. The internal oscillator simplifies design by requiring only one resistor for cutoff programming. Consider the divide-by modes if lower power consumption is necessary for the application.

Part Context

This part belongs to the LTC1569 family of sampled data filters. It is distinguished by its 10th-order architecture and root raised cosine response, unlike other family members that may offer different orders or universal filtering capabilities. The 'I' designation specifies the industrial temperature range.

Replacement Considerations

LTC1569CS8-7#PBF (Commercial grade)

FAQ

How is the cutoff frequency programmed?

It can be set using a single external resistor connected between Pin 6 and Pin 7, or by applying an external clock to Pin 5.

What is the input configuration flexibility?

The filter accepts both differential and single-ended inputs, with configurable DC gain of 1 or -1 depending on the input pin used.

Does the device require an external clock?

No, it features an internal oscillator enabled by an external resistor, though it can also operate with an external clock source.