TLC14ID

Overview

The TLC14ID is a monolithic Butterworth fourth-order low-pass switched-capacitor filter manufactured by Texas Instruments. It operates within a supply voltage range of ±2.25 V to ±6 V and supports an operating temperature range from -40 °C to 85 °C. The device provides a clock-to-cutoff frequency ratio of 100:1 with less than ±1% error. It accepts self-clocking, TTL-compatible, or CMOS-compatible clock inputs. Key electrical characteristics include a maximum clock frequency of 4 MHz at ±5 V supplies, a typical dynamic range of 84 dB, and a stop-band attenuation of 25 dB at twice the cutoff frequency.

Feature Summary

• Provides accurate fourth-order Butterworth low-pass filtering functions in circuit designs.
• Features cutoff frequency stability dependent solely on external clock frequency stability.
• Supports flexible clocking options including self-clocking, TTL-compatible, and CMOS-compatible inputs.

Applications

• Signal processing requiring precise low-pass filtering.
• Data acquisition systems utilizing switched-capacitor techniques.
• Audio signal conditioning applications.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current package option addendum to confirm active production status and material specifications. Ensure that the selected variant matches the required operating temperature range and packaging format for your assembly process.

Selection Notes

Select this component when a fixed fourth-order Butterworth response is required without discrete passive components. Evaluate the external clock source requirements, as the cutoff frequency is directly determined by the input clock frequency. Confirm that the available supply voltages align with the recommended operating conditions for the desired performance level.

Part Context

This device belongs to the TLC04/TLC14 family of switched-capacitor filters. The '14' designation indicates a 100:1 clock-to-cutoff frequency ratio, distinguishing it from the '04' variant which offers a 50:1 ratio. Both variants share identical pinouts and functional block diagrams but differ in their internal capacitor ratios.

Replacement Considerations

Public confirmed substitute part numbers include TLC04ID (50:1 ratio) and TLC14CD (commercial temperature range). Verify compatibility regarding the clock-to-cutoff frequency ratio and operating temperature specifications before substitution.

FAQ

How is the cutoff frequency determined for the TLC14ID?

The cutoff frequency is determined exclusively by the external clock frequency applied to the CLKIN or CLKR terminals, multiplied by the device's specific clock-to-cutoff ratio of 100:1.

What are the supported clock input types?

The device supports self-clocking via an external RC network, TTL-compatible clocks connected to the CLKR terminal, and CMOS-compatible clocks connected to the CLKIN terminal.

What is the maximum clock frequency at ±5 V supplies?

At ±5 V supply voltages, the maximum clock frequency is 4 MHz.