LTC1064-7CSW#TRPBF

Overview

The LTC1064-7CSW#TRPBF is a clock-tunable monolithic 8th order lowpass filter with linear passband phase and flat group delay. It features a cutoff frequency up to 100kHz, tuned via an external TTL or CMOS clock. The device operates on a power supply range of ±2.375V to ±8V (total 4.75V to 16V) and functions within a temperature range of -40°C to +85°C. It utilizes a 16-pin SO Wide package and achieves a maximum clock frequency of 5MHz at ±7.5V supplies.

Feature Summary

• Linear Phase Response: Provides linear passband phase and flat group delay for phase-matched applications.
• Steep Roll-Off: Attenuates signals more effectively than equivalent 8th order Bessel filters.
• Clock Tunable: Cutoff frequency is adjusted by an external clock signal with selectable 50:1 or 100:1 ratios.
• Wide Dynamic Range: Supports high signal-to-noise performance across various supply voltages.

Applications

• Data Communication Filters
• Time Delay Networks
• Phase-Matched Filters

Procurement Notes

Verify the #TRPBF suffix indicates tape and reel packaging for automated assembly. Confirm the CSW designation corresponds to the 16-lead plastic SO wide package. Ensure the component meets RoHS standards as indicated by the PBF marking. Check that the operating temperature range aligns with the specific C grade requirements.

Selection Notes

Select this part when linear phase response and steep roll-off are required simultaneously. Verify the external clock source can provide the necessary frequency and duty cycle. Ensure the supply voltage supports the desired dynamic range and output swing. Consider the 50:1 or 100:1 clock ratio based on aliasing requirements and input frequency constraints.

Part Context

This component belongs to the LTC1064 series of active filters. It is pin-compatible with other variants in the series, such as the LTC1064-X, LTC1164-7, and LTC1264-7. The manufacturer is Analog Devices Inc., formerly Linear Technology. The device is designed for precision analog signal processing tasks requiring specific phase characteristics.

Replacement Considerations

Public confirmed substitutes include LTC1064-7CN, LTC1064-7CJ, and LTC1064-7CSW. These parts share identical electrical specifications but differ in package type or temperature range. Verify package compatibility before substitution.

FAQ

How is the cutoff frequency determined?

The cutoff frequency is tuned via an external TTL or CMOS clock signal. The ratio between the clock frequency and the cutoff frequency can be set to 50:1 or 100:1 using Pin 10.

What is the maximum clock frequency?

The maximum clock frequency depends on the supply voltage. At ±7.5V, the maximum fCLK is 5.0MHz. At ±5V, it is 3.5MHz, and at single 5V, it is 2.0MHz.

How does the LTC1064-7 compare to an 8th order Bessel filter?

The LTC1064-7 exhibits steeper roll-off than an equivalent 8th order Bessel filter. For example, at twice the cutoff frequency, it provides 34dB attenuation compared to 12dB for a Bessel filter.