TH7301EDF-TR

Overview

The TH7301EDF-TR is a dual-channel programmable low-pass filter incorporating two matching 4th-order Butterworth filters with voltage gain control. Designed for quadrature demodulated signals, it features a wide cutoff frequency range from 0.8 MHz to 22.4 MHz and in-band voltage gain adjustable between -3 dB and 20.5 dB. The device utilizes a standard 3-wire serial interface for programming. It includes an on-chip oscillator where the oscillation frequency tracks the filter cutoff frequency, allowing accurate setting verification. The IC operates from a negative supply (typically -5 V) and supports both single-ended and differential AC-coupled inputs.

Feature Summary

• Dual-channel architecture providing superior matching for I/Q signal paths
• Companding design ensures high resolution at lower cutoff frequencies
• Integrated on-chip oscillator for precise cutoff frequency tracking
• Supports single-ended or differential input operation without external trimming components

Applications

• Digital Broadcasting Systems (DBS)
• Digital Video Broadcasting (DVB)
• Satellite and cable TV decoders
• Microwave point-to-point links

Procurement Notes

Verify that the specific suffix 'EDF-TR' corresponds to the tape-and-reel packaging variant of the commercial grade TH7301C. Confirm the manufacturer origin, as Thesys was acquired by Melexis. Ensure the datasheet revision matches the component marking to avoid discrepancies in pinout or electrical characteristics.

Selection Notes

Select this component when precise quadrature filtering is required for digital broadcast applications. The internal oscillator feature simplifies calibration compared to external reference methods. Verify that the system can accommodate the required negative power supply rails (-5V typical) and that the 3-wire serial interface timing meets the controller's capabilities.

Part Context

The TH7301 is a specialized analog front-end IC originally manufactured by Thesys Gesellschaft für Mikroelektronik mbH. Following corporate acquisitions, the product line is now managed under Melexis Technologies NV. It serves as a dedicated solution for demodulation stages in communication receivers requiring matched I/Q filtering.

Replacement Considerations

Direct replacements are not explicitly listed in the public documentation. Designers should evaluate other dual-channel programmable filters from Melexis or Thesys legacy portfolios, ensuring compatibility with the 16-pin SOP WB package and -5V supply requirements.

FAQ

How is the cutoff frequency accuracy verified?

The device contains an on-chip oscillator that generates a frequency equal to the filter's -3dB cutoff point. This allows the actual cutoff frequency to be measured directly via the oscillator output.

What is the power-on requirement for the serial interface?

The serial interface lacks a power-on reset. All three internal registers (Gain Control, Frequency Select A, and Frequency Select B) must be programmed after power-up to prevent undefined logical states.

Can the TH7301 operate with a positive supply?

Yes, while designed for a negative supply system, it can operate with positive supplies if the input signals are referred to the respective positive logic and analog supply rails.