TLC04CD

Overview

The TLC04CD is a monolithic Butterworth fourth-order low-pass switched-capacitor filter manufactured by Texas Instruments. It operates on dual supplies ranging from ±2.5 V to ±6 V (total 5 V to 12 V). The device provides a cutoff frequency range from 0.1 Hz to 30 kHz, determined exclusively by an external clock signal. It features a clock-to-cutoff frequency ratio of 50:1 with less than ±0.8% error. The component supports self-clocking or TTL- and CMOS-compatible clock inputs via the level shift terminal. It is housed in an 8-pin SOIC package and is characterized for operation within a temperature range of 0 °C to 70 °C.

Feature Summary

• Provides accurate fourth-order Butterworth low-pass filtering functions without requiring external passive components.
• Ensures cutoff frequency stability dependent solely on the external clock source, minimizing deviation due to temperature or time variations.
• Supports flexible clocking options including self-clocking through a Schmitt-trigger oscillator, as well as direct TTL and CMOS compatible inputs.

Applications

• Precision analog signal processing requiring stable low-pass filtering characteristics.
• Audio equipment utilizing switched-capacitor filter topologies.
• Instrumentation systems where filter tuning is synchronized with an external clock reference.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm the exact temperature grade and packaging format. Ensure that the procurement documentation explicitly references the active production status and confirms compliance with RoHS standards prior to acquisition.

Selection Notes

Select this component when a fixed fourth-order Butterworth response is required without external resistors or capacitors. Verify that the application can provide a stable external clock signal, as the cutoff frequency is directly proportional to the clock input. Confirm that the supply voltage requirements align with the specified ±2.5 V to ±6 V operating range.

Part Context

This device belongs to the TLC04/MF4A-50 family of switched-capacitor filters. It is designed to be functionally interchangeable with the National Semiconductor MF4-50. The 'CD' designation specifically identifies the commercial temperature grade variant packaged in a standard Small Outline Integrated Circuit (SOIC) housing.

Replacement Considerations

The TLC04CD is designed for interchangeability with the MF4-50. When substituting, verify pin compatibility and ensure the replacement part supports the same 50:1 clock-to-cutoff frequency ratio and dual-supply voltage requirements.