Texas Instruments TLC2543CFNG3

Overview

TLC2543CFNG3 from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (ADC) with serial control interface, 11 analog input channels, on-chip sample-and-hold, and 10-µs conversion time over 0°C to 70°C. It features programmable MSB/LSB-first output, unipolar/bipolar operation, and built-in self-test modes for industrial sensor data acquisition systems.

For engineers reviewing the TLC2543CFNG3 datasheet, TLC2543CFNG3 pinout, TLC2543CFNG3 application, or TLC2543CFNG3 equivalent, key selection considerations include its 4.1-MHz serial clock support, differential reference inputs enabling ratiometric measurement, 11-channel multiplexer with <50-Ω source impedance requirement, and EOC-driven timing synchronization in microcontroller-based DAQ designs.

Technical Context

The TLC2543CFNG3 implements a switched-capacitor SAR 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 - comprising 4-bit channel address, 2-bit data length (8/12/16 bits), 1-bit MSB/LSB order, and 1-bit unipolar/bipolar mode - on DATA INPUT synchronized to I/O CLOCK rising edges.

Conversion begins on the fourth falling edge of I/O CLOCK and completes within 10 µs; EOC transitions low at conversion start and high upon result latching. The device uses differential high-impedance REF+/REF– inputs (2.5 V to VCC+0.1 V range) and supports programmable power-down mode drawing ≤25 µA.

Key Specifications

Pinout & Package

Package: 20-pin plastic DIP (N package), through-hole mounting compatible with standard PCB layouts and manual soldering processes.

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 TLC2543CFNG3 provides unique integration of 11-channel multiplexing, self-test capability, and programmable data formatting - making it optimal for embedded systems requiring verified multi-sensor acquisition without added external components.

Availability

TLC2543CFNG3 is available at Aetrix Electronics and suitable for industrial sensor monitoring, automated test equipment, energy metering front-ends, and motor control feedback interfaces requiring stable component supply and long-term obsolescence management.

Supply support for TLC2543CFNG3 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 precision data converter expertise.

The TLC2543 family was designed for microcontroller-based data acquisition systems requiring high-resolution, multi-channel, serial-interface ADCs with integrated diagnostics and flexible reference handling - targeting industrial, test, and instrumentation markets.

FAQ

What is the maximum I/O CLOCK frequency supported by the TLC2543CFNG3?

The TLC2543CFNG3 supports up to 4.1 MHz I/O CLOCK frequency under recommended operating conditions (VCC = 4.5 V to 5.5 V). At this rate, the device achieves 10-µs conversion time and full 12-bit accuracy. Operation above 4.1 MHz may degrade linearity or cause timing violations, particularly with higher source impedances on analog inputs.

Does the TLC2543CFNG3 require an external sample-and-hold circuit?

No, the TLC2543CFNG3 includes an inherent sample-and-hold function that activates automatically during the I/O cycle. Sampling begins on the fourth falling edge of I/O CLOCK and holds until the last falling edge, eliminating the need for external S/H components and reducing system complexity in designs using the TLC2543CFNG3.

How does the TLC2543CFNG3 handle bipolar input signals?

The TLC2543CFNG3 supports bipolar operation via its unipolar/bipolar output select bit (D0). When enabled, it outputs signed binary data referenced to VREF+/2 - allowing direct digitization of AC-coupled or bidirectional analog signals such as motor phase currents or audio sensor outputs without external level-shifting circuitry.

What self-test voltages are available on the TLC2543CFNG3?

The TLC2543CFNG3 provides three internal self-test voltages: 0 V (address 1100), VREF+/2 (address 1011), and VREF+ (address 1101). These are selected by writing the corresponding 4-bit address to DATA INPUT during the I/O cycle, enabling in-system verification of ADC functionality without external test equipment.

Is the TLC2543CFNG3 pin-compatible with other variants like TLC2543IN or TLC2543IDW?

The TLC2543CFNG3 (N-package DIP) shares identical pinout and electrical behavior with TLC2543IN (same N-package) but differs from DW (SOIC) and DB (SSOP) variants in physical footprint and thermal characteristics. While functional compatibility exists across C/I/M grades, mechanical replacement requires matching package type - TLC2543CFNG3 is not mechanically interchangeable with SOIC or SSOP versions.