Texas Instruments TLC2543IDWG4

Overview

TLC2543IDWG4 from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (ADC) with serial interface, 11-channel analog multiplexer, and on-chip sample-and-hold. It delivers 10 µs conversion time, ±1 LSB linearity error, and supports unipolar/bipolar output modes across –40°C to 85°C. Used in industrial sensor data acquisition systems requiring high-resolution, low-noise digitization of multiple analog signals.

For engineers reviewing the TLC2543IDWG4 datasheet, TLC2543IDWG4 pinout, TLC2543IDWG4 application, or TLC2543IDWG4 equivalent, this page provides verified technical context, real-world design meanings for key specs, validated pin functions, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The TLC2543IDWG4 implements a switched-capacitor successive-approximation architecture with an integrated 14-channel analog multiplexer selecting among 11 external inputs or three internal self-test voltages. Its control logic accepts an 8-bit serial command (4-bit address + 2-bit data length + MSB/LSB select + unipolar/bipolar mode) via DATA INPUT synchronized to I/O CLOCK.

Conversion timing is tightly coupled to the I/O cycle: sampling begins on the fourth falling edge of I/O CLOCK and completes after the final falling edge, triggering EOC low to start the internal 12-bit conversion. The device features differential high-impedance reference inputs (REF+, REF–) enabling ratiometric operation and isolation from supply noise.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), leaded plastic small-outline integrated circuit, 0.300-inch body width, JEDEC MS-013AC compliant.

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 TLC2543IDWG4 uniquely integrates 11-channel multiplexing, differential reference inputs, three self-test modes, and programmable output formatting-making it the only option among the three suitable for industrial multi-sensor systems requiring field-verifiable accuracy and ratiometric stability.

Availability

TLC2543IDWG4 is available at Aetrix Electronics and suitable for industrial sensor data acquisition, motor control feedback monitoring, automated test equipment, environmental monitoring systems, and PLC analog I/O modules requiring stable component supply across extended temperature ranges.

Supply support for TLC2543IDWG4 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 industrial data acquisition-emphasizing serial interface simplicity, multiplexed channel density, and robust operation across –40°C to 85°C without external support components.

FAQ

What is the maximum I/O clock frequency supported by the TLC2543IDWG4?

The TLC2543IDWG4 supports a maximum I/O clock frequency of 4.1 MHz under recommended operating conditions. This limit ensures proper setup/hold timing for address bits and reliable sampling of analog inputs. Exceeding this frequency may cause conversion errors or invalid data output, as specified in the SLAS079F datasheet timing diagrams and electrical characteristics table.

Does the TLC2543IDWG4 require an external sample-and-hold circuit?

No, the TLC2543IDWG4 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 last falling edge, eliminating the need for external S/H components and simplifying system design for multi-channel acquisition.

How does the TLC2543IDWG4 handle bipolar input signals?

The TLC2543IDWG4 supports bipolar operation via its unipolar/bipolar output select bit (D0) in the control word. When enabled, it outputs signed binary data referenced to VCC/2, allowing direct digitization of signals ranging from –VREF to +VREF with respect to REF– and REF+.

What self-test modes are available on the TLC2543IDWG4?

The TLC2543IDWG4 provides three built-in self-test modes activated by specific 4-bit address codes: 1011 outputs code 2048 (mid-scale), 1100 outputs 0 (zero-scale), and 1101 outputs 4095 (full-scale). These modes verify ADC functionality without external stimulus, supporting diagnostic compliance in safety-critical systems.

Is the TLC2543IDWG4 pin-compatible with other variants in the TLC2543 family?

Yes, the TLC2543IDWG4 shares identical pinout and package (SOIC-20 DW) with TLC2543CDWG4 and TLC2543MDWG4. All variants use the same terminal functions, timing behavior, and register mapping-only temperature grade and certain leakage parameters differ per datasheet Section 4 (Absolute Maximum Ratings) and Section 6 (Operating Characteristics).