Texas Instruments TLC2543ING4

Overview

TLC2543ING4 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 10 µs conversion time, ±1 LSB linearity error, and supports unipolar/bipolar output modes. Used in industrial sensor data acquisition systems requiring high-resolution, low-noise digitization of multiple analog signals.

For engineers reviewing the TLC2543ING4 datasheet, TLC2543ING4 pinout, TLC2543ING4 application, or TLC2543ING4 equivalent, key selection criteria include its 11 analog inputs, programmable MSB/LSB-first output, built-in self-test modes, and compatibility with microcontroller SPI-like serial interfaces operating up to 4.1 MHz.

Technical Context

The TLC2543ING4 implements a switched-capacitor successive-approximation architecture with an integrated 14-channel analog multiplexer (11 external + 3 internal self-test). Its control logic accepts an 8-bit serial command-comprising 4-bit channel address, 2-bit data length select, MSB/LSB bit, and unipolar/bipolar mode bit-on DATA INPUT synchronized to I/O CLOCK rising edges.

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, which also triggers EOC low. The internal system clock eliminates need for external timing components, and differential reference inputs (REF+/REF–) enable ratiometric measurement and noise isolation.

Key Specifications

Pinout & Package

Package: 20-pin plastic DIP (N package), through-hole mounting, 0.3-inch width, RoHS-compliant lead finish.

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 TLC2543ING4 uniquely integrates 11-channel multiplexing, three self-test modes, and configurable output format-making it the only option among the three that supports robust, scalable multi-sensor acquisition without added ICs or firmware complexity.

Availability

TLC2543ING4 is available at Aetrix Electronics and suitable for industrial process monitoring, energy metering, automotive sensor hubs, and portable medical instrumentation requiring stable component supply over extended production lifecycles.

Supply support for TLC2543ING4 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 power management technologies, with decades of heritage in precision data converters.

The TLC2543 family was designed for microcontroller-based data acquisition systems needing reliable, feature-rich serial ADCs with integrated multiplexing and diagnostics-targeting industrial, automotive, and instrumentation markets.

FAQ

What is the operating temperature range of the TLC2543ING4?

The TLC2543ING4 is rated for operation from –40°C to +85°C (industrial grade). This specification is confirmed in the device's characterization data and aligns with the TLC2543I variant designation. The 'G4' suffix denotes the green (lead-free) packaging variant of the TLC2543I-grade part in N-package (20-pin DIP), and does not alter thermal performance. All electrical parameters-including linearity error, conversion time, and reference input behavior-remain valid across this full range.

Does the TLC2543ING4 require an external clock source?

No, the TLC2543ING4 does not require an external clock source. It incorporates an on-chip system clock synchronized to the externally supplied I/O CLOCK signal. The I/O CLOCK serves dual roles: it clocks serial data in/out and triggers internal sampling and conversion timing. The device operates fully with only the I/O CLOCK input-no separate master clock or crystal oscillator is needed. This simplifies PCB layout and reduces BOM count in space-constrained designs.

How many analog input channels does the TLC2543ING4 support?

The TLC2543ING4 supports 11 analog input channels (AIN0 through AIN10), managed by an integrated 14-channel analog multiplexer (11 external + 3 internal self-test voltage sources). Each channel is single-ended, and the device automatically performs sample-and-hold during the I/O cycle. Channel selection is controlled via the 4-bit address field in the 8-bit serial command sent to DATA INPUT, enabling flexible, software-directed scanning without external switching components.

Can the TLC2543ING4 interface directly with standard SPI peripherals?

Yes, the TLC2543ING4 is compatible with standard microcontroller SPI peripherals, though it uses a non-standard 3-wire protocol (CS, I/O CLOCK, DATA INPUT/OUT) rather than full 4-wire SPI. It supports MSB-first or LSB-first data ordering, programmable output lengths (8/12/16 bits), and shares timing conventions (data sampled on clock edges). No level-shifting is required for 5 V systems. Host firmware must manage the 8-bit command structure and interpret EOC for synchronization-details are fully documented in the SLAS079F datasheet for TLC2543ING4.

What self-test functions are available on the TLC2543ING4?

The TLC2543ING4 provides three built-in self-test modes selectable via the 4-bit address field: address 1011 (0xB) returns code 2048 (mid-scale), 1100 (0xC) returns 0 (zero-scale), and 1101 (0xD) returns 4095 (full-scale). These correspond to internally generated reference voltages applied to the ADC core, enabling system-level verification of gain, offset, and linearity without external test equipment. Self-test execution requires no hardware modification and is initiated solely through serial command-making it ideal for field diagnostics and functional safety compliance.