Texas Instruments TLC2543IDBR

Overview

TLC2543IDBR 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 across –40°C to 85°C. It is used in industrial data acquisition systems requiring precise ratiometric measurement of multiple sensor inputs.

For engineers reviewing the TLC2543IDBR datasheet, TLC2543IDBR pinout, TLC2543IDBR application, or TLC2543IDBR equivalent, key selection considerations include its 11 analog input channels, programmable MSB/LSB-first output, unipolar/bipolar operation mode, and compatibility with microcontroller serial ports via CS/I/O CLOCK/DATA INPUT/DATA OUT interface.

Technical Context

The TLC2543IDBR implements a switched-capacitor successive-approximation architecture with an integrated 14-channel analog multiplexer (11 external + 3 internal self-test). Its conversion cycle is synchronized to the external I/O CLOCK, beginning after the final falling edge of the I/O cycle - isolating conversion from digital noise.

It features differential high-impedance reference inputs (REF+/REF–), enabling ratiometric scaling and analog circuit isolation from logic supply noise. The device supports 8-, 12-, or 16-clock I/O cycles, with programmable output data length and automatic sample-and-hold triggered on the fourth falling edge of I/O CLOCK.

Key Specifications

Pinout & Package

Package: SOIC-20 (DB), tape-and-reel packaging per ordering suffix "R" - surface-mount compatible with automated PCB assembly.

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 TLC2543IDBR provides unique integration of 11-channel multiplexing, built-in self-test, EOC signaling, and differential reference support - making it the only option among the three suitable for robust, multi-sensor industrial data loggers requiring diagnostics and noise-immune ratiometric measurement.

Availability

TLC2543IDBR is available at Aetrix Electronics and suitable for industrial data acquisition, motor control feedback, environmental sensor hubs, and PLC analog input modules requiring stable component supply and long-term manufacturability.

Supply support for TLC2543IDBR 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 industrial-grade product validation.

The TLC2543 family was designed specifically for microcontroller-based industrial measurement systems requiring high-resolution, multi-channel, serial-interface ADCs with integrated diagnostics and wide-temperature operation.

FAQ

What is the operating temperature range of the TLC2543IDBR?

The TLC2543IDBR is rated for operation from –40°C to +85°C, qualifying it for industrial environments such as factory automation, motor drives, and outdoor sensor nodes. This specification is explicitly defined for the "I" grade variant in the official datasheet SLAS079F, and the "DB" package suffix confirms SOIC-20 packaging. The TLC2543IDBR maintains full 12-bit performance and ±1 LSB linearity across this entire range.

Does the TLC2543IDBR require an external clock source?

No, the TLC2543IDBR does not require an external clock source beyond the host-provided I/O CLOCK signal. It incorporates an on-chip system clock synchronized to the I/O CLOCK input, eliminating the need for a separate crystal or oscillator. The device operates with I/O CLOCK frequencies up to 4.1 MHz and uses the falling edges of that clock to trigger sampling and initiate conversion - all internal timing is derived from this single external signal.

How many analog input channels does the TLC2543IDBR support?

The TLC2543IDBR supports 11 independent analog input channels (labeled AIN0 through AIN10), implemented via an integrated 14-channel analog multiplexer (11 external + 3 internal self-test inputs). This allows sequential conversion of multiple sensors without external multiplexing hardware. Each channel is single-ended, and the device automatically handles channel selection based on the 4-bit address provided during each serial transaction.

What reference configuration options does the TLC2543IDBR offer?

The TLC2543IDBR provides differential reference inputs (REF+ and REF–) supporting both unipolar and bipolar output operation. In unipolar mode, the full-scale range is 0 V to (REF+ – REF–); in bipolar mode, it is –(REF+ – REF–)/2 to +(REF+ – REF–)/2 using signed binary encoding. This enables ratiometric measurements and direct interfacing with isolated sensor bridges or current-loop receivers without additional level-shifting circuitry.

Is the TLC2543IDBR pin-compatible with other variants in the TLC2543 family?

Yes, the TLC2543IDBR shares identical pinout and package (SOIC-20, DB) with all other TLC2543x DB variants, including TLC2543CDB, TLC2543CDWR, and TLC2543IDW. Electrical specifications differ only in temperature grade and packaging form (tape-and-reel vs. tube), but mechanical footprint, terminal functions, and serial interface protocol are fully consistent across the DB-package family members.