Texas Instruments TLC2543CDB

Overview

TLC2543CDB 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 ±1 LSB linearity error, 10 µs conversion time, and operates from 0°C to 70°C. Used in industrial sensor data acquisition systems requiring ratiometric measurement and low-noise analog front-end isolation.

For engineers reviewing the TLC2543CDB datasheet, TLC2543CDB pinout, TLC2543CDB application, or TLC2543CDB equivalent, key selection criteria include unipolar/bipolar output configuration, programmable MSB/LSB-first data format, 4.1 MHz max I/O clock support, and built-in self-test modes for system diagnostics.

Technical Context

The TLC2543CDB 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 differential high-impedance reference inputs (REF+, REF–) enable ratiometric conversion and reduce sensitivity to supply noise.

Control is executed via three serial interface signals - chip select (CS), I/O clock, and DATA INPUT - with DATA OUT providing 3-state serial output. Conversion timing is synchronized to the I/O clock, with sampling initiated on the fourth falling edge and conversion beginning after the final I/O clock falling edge.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (DB package), 7.5 mm × 12.8 mm body, 1.27 mm pitch, surface-mount.

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 TLC2543CDB uniquely combines 11-channel multiplexing, differential reference support, three self-test modes, and programmable data format - making it irreplaceable in multi-sensor, ratiometric, and diagnostic-critical applications.

Availability

TLC2543CDB is available at Aetrix Electronics and suitable for industrial sensor monitoring, automated test equipment, energy metering front-ends, and medical instrumentation signal chains requiring stable component supply and long-term production continuity.

Supply support for TLC2543CDB 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 expertise in precision data converters and industrial-grade IC design.

The TLC2543CDB belongs to TI's legacy precision serial ADC product line, engineered specifically for multiplexed, ratiometric, and self-diagnostic data acquisition in commercial-temperature industrial and instrumentation applications.

FAQ

What is the maximum I/O clock frequency supported by the TLC2543CDB?

The TLC2543CDB supports an I/O clock frequency up to 4.1 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V). This enables high-speed serial communication with microcontrollers and DSPs while maintaining guaranteed timing margins for reliable data capture and conversion synchronization. The TLC2543CDB achieves its specified 10 µs conversion time at this maximum clock rate.

Does the TLC2543CDB require an external sample-and-hold circuit?

No, the TLC2543CDB integrates an inherent sample-and-hold function that activates automatically during the I/O cycle. Sampling begins on the fourth falling edge of the I/O clock and concludes after the final falling edge - eliminating the need for external S/H components and reducing system complexity and board area. This is explicitly confirmed in the device's functional description and timing diagrams.

How does the TLC2543CDB handle bipolar versus unipolar output formats?

The TLC2543CDB supports both unipolar and bipolar output via the D0 bit in the 8-bit input command. When D0 = 0, output is unipolar (0 to Vref+ – Vref–); when D0 = 1, output is signed binary relative to Vref+/2 (bipolar range centered at mid-scale). This setting directly determines the interpretation of the 12-bit result and is applied per conversion cycle without hardware reconfiguration.

What self-test voltages are available on the TLC2543CDB and how are they selected?

The TLC2543CDB provides three internal self-test voltages: 0 V, Vref+/2, and Vref+. They are selected by writing specific 4-bit address values to the DATA INPUT register: 1011 yields 0 V (code 0x000), 1100 yields Vref+/2 (code 0x000), and 1101 yields Vref+ (code 0xFFF). These modes allow in-system verification of ADC linearity, offset, and gain without external test equipment.

Is the TLC2543CDB pin-compatible with other variants like TLC2543IDB or TLC2543CDWR?

Yes - the TLC2543CDB shares identical pinout and electrical interface with TLC2543IDB (industrial temp) and TLC2543CDWR (SOIC wide-body), as confirmed by the DB/DW/FN package diagrams and terminal function table in the official datasheet. All use the same 20-pin SOIC footprint and signal mapping, enabling drop-in replacement across temperature grades and package variants.