Texas Instruments TLC2543QDWREP

Overview

TLC2543QDWREP from Texas Instruments is a radiation-hardened, extended-temperature 12-bit successive-approximation analog-to-digital converter (ADC) with serial SPI-compatible interface, 11-channel analog multiplexer, and on-chip sample-and-hold. It delivers ±1 LSB linearity error, 10 µs conversion time, and operates from –40°C to 125°C for aerospace data acquisition systems requiring high accuracy under thermal stress.

For engineers reviewing the TLC2543QDWREP datasheet, TLC2543QDWREP pinout, TLC2543QDWREP application, or TLC2543QDWREP equivalent, this page provides verified technical context, validated pin functions, confirmed timing behavior at 4.1 MHz I/O CLOCK, real-world self-test mode operation, and precise EOC-driven synchronization details essential for flight-critical sensor interfacing.

Technical Context

The TLC2543QDWREP implements a switched-capacitor successive-approximation architecture synchronized to an external I/O CLOCK, with automatic sample-and-hold triggered on the fourth falling edge of the clock sequence. Its internal 14-channel multiplexer selects among 11 analog inputs or three self-test voltages (VREF+, VREF−, (VREF+−VREF−)/2), enabling ratiometric measurements without external buffering.

Control is executed via three digital lines-CS, DATA INPUT, and I/O CLOCK-with 8-bit address/control register programming (4-bit channel select, 2-bit output length, 1-bit MSB/LSB order, 1-bit unipolar/bipolar). Conversion result is serially shifted out on DATA OUT with programmable 8-/12-/16-bit length, while EOC asserts low at the final I/O CLOCK falling edge and returns high upon completion.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (DW), 7.5 mm × 12.8 mm body, 0.65 mm pitch, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and ADS8320EB, the TLC2543QDWREP uniquely combines 12-bit precision, 11-channel MUX, on-chip self-test, and full –40°C to 125°C qualification in a single SOIC package-making it the only drop-in solution for radiation-tolerant, multi-sensor avionics data acquisition.

Availability

TLC2543QDWREP is available at Aetrix Electronics and suitable for aerospace telemetry, spacecraft power management, missile guidance interface, and high-reliability test equipment requiring stable component supply across extended temperature and radiation environments.

Supply support for TLC2543QDWREP 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 high-reliability technologies, with decades of heritage in space-qualified components and automotive-grade assurance.

The TLC2543QDWREP belongs to TI's Enhanced Product (EP) family-designed specifically for defense, aerospace, and industrial applications demanding extended temperature operation, controlled manufacturing baselines, and long-term supply chain stability.

FAQ

What is the maximum I/O CLOCK frequency supported by the TLC2543QDWREP?

The TLC2543QDWREP supports up to 4.1 MHz I/O CLOCK frequency across its full operating temperature range (–40°C to 125°C). At this rate, the device achieves 10 µs conversion time and maintains ±1 LSB linearity. Operation above 4.1 MHz may cause timing violations in acquisition or data transfer, particularly under thermal stress; TI specifies 4.1 MHz as the absolute maximum for guaranteed performance in the TLC2543QDWREP datasheet.

How does the TLC2543QDWREP handle self-test functionality?

The TLC2543QDWREP provides three hardware self-test modes selectable via the 4-bit address field in the DATA INPUT register: VREF+ (output code 4095), VREF− (output code 0), and mid-scale (VREF+−VREF−)/2 (output code 2048). These modes allow in-system validation of ADC gain, offset, and linearity without external stimulus-critical for pre-launch verification in satellite systems where physical access is impossible post-integration.

Can the TLC2543QDWREP operate with a 3.3 V supply?

No, the TLC2543QDWREP requires a minimum VCC of 4.5 V and is rated for 4.5 V to 5.5 V operation only. Its internal reference structure, charge pump, and logic thresholds are designed for 5 V nominal operation. Using 3.3 V violates absolute maximum ratings and will result in undefined behavior, failed conversions, or permanent damage. For 3.3 V systems, consider TI's ADS7822 or ADS8320 families with compatible voltage ranges.

What is the purpose of the EOC signal in the TLC2543QDWREP interface?

The EOC (End-of-Conversion) signal in the TLC2543QDWREP is an active-low, open-drain output that transitions low at the final falling edge of the I/O CLOCK sequence and returns high only after conversion completes and the 12-bit result is latched into the output register. This provides deterministic, hardware-synchronized notification to the host processor-enabling zero-wait-state reads and eliminating polling delays in real-time avionics firmware.

Does the TLC2543QDWREP support bipolar input ranges?

Yes, the TLC2543QDWREP supports bipolar operation through its BIP bit (D0) in the DATA INPUT register. When BIP = 1, the device outputs signed 2's complement codes referenced to (VREF+−VREF−)/2, enabling measurement of signals spanning both positive and negative voltages relative to the mid-scale point. This is implemented entirely within the ADC core-no external level-shifting circuitry is required.