Texas Instruments TLC2543CFN

Overview

TLC2543CFN from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (ADC) with serial control interface, 11-channel analog multiplexer, and on-chip sample-and-hold. It delivers 10 µs conversion time, ±1 LSB linearity error, and operates from 0°C to 70°C. Used in industrial data acquisition systems requiring high-resolution, low-noise digitization of multiple sensor inputs.

For engineers reviewing the TLC2543CFN datasheet, TLC2543CFN pinout, TLC2543CFN application, or TLC2543CFN equivalent, key selection criteria include unipolar/bipolar output configuration, programmable MSB/LSB-first data format, 4.1 MHz max I/O clock rate, and built-in self-test modes for system diagnostics.

Technical Context

The TLC2543CFN implements a switched-capacitor SAR architecture with an integrated 14-channel analog multiplexer (11 external + 3 internal test voltages), enabling flexible channel selection via 4-bit serial address. Its differential high-impedance reference inputs (REF+, REF–) support ratiometric measurement and isolation from supply noise.

Conversion is initiated after an 8-, 12-, or 16-clock I/O cycle, during which the previous result is shifted out while the new channel address and control bits are loaded. The end-of-conversion (EOC) signal transitions low at the final I/O clock falling edge and returns high once conversion completes and data is latched.

Key Specifications

Pinout & Package

Ceramic DIP (FN) package, 20-pin dual in-line, through-hole mount. Pin spacing 0.1 inch, body width 0.3 inches, compliant with MIL-STD-883 for ruggedized applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit serial ADC applications.

Compared with ADS7822U and MCP3208-I/P, the TLC2543CFN uniquely combines 11-channel integration, sub-10 µs conversion, and three factory-trimmed self-test voltages - making it optimal for safety-critical or calibration-intensive industrial data acquisition where channel density and on-device validation are mandatory.

Availability

TLC2543CFN is available at Aetrix Electronics and suitable for industrial process monitoring, automotive sensor interface, test equipment design, and energy metering subsystems requiring stable component supply over extended production lifecycles.

Supply support for TLC2543CFN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of heritage in precision data converters and industrial-grade ICs.

The TLC2543 family was designed specifically for high-reliability serial ADC applications in commercial and industrial environments, emphasizing noise-immune serial communication, integrated diagnostics, and wide supply/reference flexibility.

FAQ

What is the maximum I/O clock frequency supported by the TLC2543CFN?

The TLC2543CFN supports an I/O clock frequency up to 4.1 MHz under recommended operating conditions. This allows full 12-bit data transfer within 3 µs, enabling high-throughput sampling in microcontroller-based systems. Exceeding this limit may cause timing violations and invalid conversion results. The TLC2543CFN datasheet specifies pulse width and transition time requirements to ensure reliable operation at this maximum rate.

Does the TLC2543CFN require an external sample-and-hold circuit?

No, the TLC2543CFN includes an inherent sample-and-hold function that automatically acquires the analog input voltage on the fourth falling edge of the I/O clock and holds it until conversion completes. This eliminates the need for external S/H components, reducing BOM cost and board space. The TLC2543CFN's internal capacitor array and timing control ensure stable acquisition even with source impedances up to 50 Ω.

How does the TLC2543CFN handle unipolar versus bipolar output configurations?

The TLC2543CFN supports both unipolar and bipolar output via the D0 bit in the 8-bit control word: D0 = 0 selects unipolar (0 to VREF+ – VREF–), D0 = 1 selects bipolar (–VREF+/2 to +VREF+/2 in signed binary). In bipolar mode, the output centers around VREF+/2, enabling direct digitization of AC-coupled or differential sensor outputs. The TLC2543CFN maintains ±1 LSB linearity in both modes across its full operating temperature range.

What self-test voltages are available on the TLC2543CFN and how are they selected?

The TLC2543CFN provides three internal self-test voltages: 0 V (address 1100), mid-scale (VREF+/2, address 1011), and full-scale (VREF+, address 1101). These are selected by loading the corresponding 4-bit address into the DATA INPUT register during the I/O cycle. Using these voltages, the TLC2543CFN enables in-system verification of gain, offset, and linearity without external test equipment - critical for field-deployed industrial instruments.

What is the operating temperature range of the TLC2543CFN and how does it compare to other variants?

The TLC2543CFN is characterized for operation from 0°C to 70°C, matching the commercial-grade TLC2543C variant. It differs from the TLC2543I (–40°C to 85°C) and TLC2543M (–55°C to 125°C) in temperature qualification only - all share identical electrical specifications, pinout, and functional behavior. The TLC2543CFN's ceramic DIP (FN) package enhances thermal stability and mechanical robustness within its rated range.