Texas Instruments TLC2543CDW

Overview

TLC2543CDW from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (ADC) with serial control interface, 11 analog input channels, on-chip sample-and-hold, and built-in self-test modes. It operates over 0°C to 70°C, delivers 10 µs conversion time, ±1 LSB linearity error, and supports unipolar/bipolar output operation using external reference inputs REF+ and REF–. It is used in industrial data acquisition systems requiring high-resolution, multi-channel sampling with microcontroller-based serial interfacing.

For engineers reviewing the TLC2543CDW datasheet, TLC2543CDW pinout, TLC2543CDW application, or TLC2543CDW equivalent, this page provides verified technical context, validated pin functions, confirmed operating specifications (including 4.1 MHz I/O clock support, programmable MSB/LSB-first output, and power-down mode), and real-world application mappings for embedded sensor monitoring and precision measurement systems.

Technical Context

The TLC2543CDW implements a switched-capacitor successive-approximation ADC architecture with an integrated 14-channel analog multiplexer selecting among 11 external analog inputs or three internal self-test voltages. Its serial interface uses three control lines - CS, I/O CLOCK, and DATA INPUT - to configure channel selection, data length (8/12/16 bits), MSB/LSB order, and unipolar/bipolar mode.

Conversion timing is synchronized to the I/O CLOCK: sampling begins on the fourth falling edge and completes after the final falling edge, triggering EOC low; conversion finishes within 10 µs, and result data is shifted out serially on DATA OUT during the next I/O cycle. The device features differential high-impedance reference inputs enabling ratiometric scaling and noise isolation.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (DW package), body width 7.5 mm, standard JEDEC MS-013AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MCP3201-I/P, the TLC2543CDW uniquely integrates 11 analog inputs, self-test functionality, and programmable data length in a single SOIC package - making it optimal for space-constrained, multi-sensor industrial designs requiring in-field verification and flexible serial protocol alignment.

Availability

TLC2543CDW is available at Aetrix Electronics and suitable for industrial sensor data acquisition, programmable logic controller analog input modules, and test & measurement equipment requiring stable component supply across extended production lifecycles.

Supply support for TLC2543CDW 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 precision data converter innovation.

The TLC2543 series was designed specifically for microcontroller-based serial data acquisition systems needing multi-channel, self-testing, and ratiometric 12-bit conversion in commercial-temperature industrial environments.

FAQ

What is the maximum I/O clock frequency supported by the TLC2543CDW?

The TLC2543CDW supports an I/O clock frequency up to 4.1 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This clock rate determines the minimum total cycle time and enables full-speed 12-bit transfers in approximately 3 µs per channel when using 12-clock mode. Exceeding 4.1 MHz may cause timing violations or conversion inaccuracies.

Does the TLC2543CDW require an external sample-and-hold circuit?

No, the TLC2543CDW includes an inherent sample-and-hold function that operates automatically during the I/O cycle. Sampling begins on the fourth falling edge of the I/O CLOCK and holds until the final falling edge - eliminating the need for external S/H components and reducing system complexity and board area.

How does the TLC2543CDW handle bipolar input signals?

The TLC2543CDW supports bipolar operation through its unipolar/bipolar output select bit (D0) in the control word. When enabled, it outputs signed binary data referenced to Vref+/2 - allowing analog inputs ranging from REF– to REF+ to be represented as –2048 to +2047. This requires proper biasing of REF– and REF+ to define the center point.

What self-test voltages are available on the TLC2543CDW?

The TLC2543CDW provides three internal self-test voltages: 0 V (address 1100), Vref+/2 (address 1011), and Vref+ (address 1101). These are routed to the analog multiplexer and converted like external inputs - enabling in-system verification of gain, offset, and linearity without external test equipment.

Is the TLC2543CDW pin-compatible with other variants in the TLC2543 family?

Yes, the TLC2543CDW shares identical pinout and electrical behavior with TLC2543IDW and TLC2543CDWR in the DW package. All DW-variant devices use the same 20-pin SOIC footprint, terminal functions, and serial protocol - differing only in temperature grade (C vs. I) and packaging format (tube vs. tape/reel).