Texas Instruments TLC2543IDWRG4

Overview

TLC2543IDWRG4 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 ±1 LSB linearity error, 10 µs conversion time, and supports unipolar/bipolar output operation with programmable MSB/LSB-first data format - used in industrial sensor signal conditioning and microcontroller-based data acquisition systems.

For engineers reviewing the TLC2543IDWRG4 datasheet, TLC2543IDWRG4 pinout, TLC2543IDWRG4 application, or TLC2543IDWRG4 equivalent, key selection criteria include its 11 analog inputs, 4.1 MHz max I/O clock frequency, built-in self-test modes, differential reference input architecture, and –40°C to +85°C industrial temperature range.

Technical Context

The TLC2543IDWRG4 implements a switched-capacitor SAR architecture with an integrated 14-channel analog multiplexer selecting among 11 external analog inputs or three internal self-test voltages. Its control logic accepts an 8-bit serial command (4-bit address + 2-bit data length + 1-bit MSB/LSB + 1-bit unipolar/bipolar) 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; conversion then proceeds autonomously using the on-chip system clock. The device features high-impedance REF+/REF– inputs enabling ratiometric measurement and isolation from supply noise.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), tape-and-reel, RoHS-compliant. Pin count: 20. Body width: 7.5 mm. Standard JEDEC MO-026AC 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 TLC2543IDWRG4 uniquely combines 11-channel multiplexing, built-in self-test, and programmable data length in a single SOIC-20 package - making it optimal for space-constrained industrial controllers requiring verified multi-sensor digitization without external support components.

Availability

TLC2543IDWRG4 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, and environmental data logging requiring stable component supply across extended production lifecycles.

Supply support for TLC2543IDWRG4 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The TLC2543 family was engineered for robust serial ADC performance in harsh industrial environments, emphasizing reliability, multiplexed channel flexibility, and integrated diagnostics for automated test and control systems.

FAQ

What is the maximum I/O clock frequency supported by the TLC2543IDWRG4?

The TLC2543IDWRG4 supports a maximum I/O clock frequency of 4.1 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V). This timing constraint ensures reliable address latching, sampling initiation, and data shifting while maintaining ±1 LSB linearity. Exceeding this frequency may cause conversion errors or metastability in the serial interface logic of the TLC2543IDWRG4.

Does the TLC2543IDWRG4 require an external sample-and-hold circuit?

No, the TLC2543IDWRG4 includes an inherent sample-and-hold function that operates automatically during the I/O cycle - sampling begins on the fourth falling edge of I/O CLOCK and holds until the final falling edge. This eliminates the need for external S/H components, simplifying layout and reducing system cost while maintaining 12-bit accuracy across the –40°C to +85°C range of the TLC2543IDWRG4.

How does the TLC2543IDWRG4 handle bipolar input signals?

The TLC2543IDWRG4 supports bipolar operation via its D0 control bit: when set, output format becomes signed binary referenced to VREF/2, allowing input ranges from –VREF/2 to +VREF/2. This mode is enabled by applying appropriate voltages to REF+ and REF– (e.g., REF+ = VCC, REF– = 0 V), and is confirmed functional across the full industrial temperature range of the TLC2543IDWRG4.

What self-test voltages does the TLC2543IDWRG4 generate internally?

The TLC2543IDWRG4 provides three internal self-test modes selectable via 4-bit address codes: 1011 yields output code 2048 (mid-scale), 1100 yields 0 (zero-scale), and 1101 yields 4095 (full-scale). These deterministic outputs allow firmware-level validation of ADC functionality, reference path integrity, and digital interface timing - a capability documented specifically for the TLC2543IDWRG4 in SLAS079F.

Can the TLC2543IDWRG4 operate with a 3.3 V supply?

No - the TLC2543IDWRG4 is specified for VCC = 4.5 V to 5.5 V only. Absolute maximum ratings permit down to –0.5 V, but recommended operation below 4.5 V is not characterized and may result in degraded linearity, increased offset error, or failure to meet the 10 µs conversion time spec. Designs requiring 3.3 V compatibility should consider alternative ADCs explicitly rated for that voltage, not the TLC2543IDWRG4.