Texas Instruments TLC2543CDWR

Overview

TLC2543CDWR 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 from 0°C to 70°C. Used in industrial data acquisition systems interfacing sensors to microcontrollers via SPI-compatible 3-wire serial bus.

For engineers reviewing the TLC2543CDWR datasheet, TLC2543CDWR pinout, TLC2543CDWR application, or TLC2543CDWR equivalent, key selection criteria include unipolar/bipolar output mode support, programmable MSB/LSB-first data format, 4.1 MHz max I/O clock rate, built-in self-test capability, and ratiometric reference input architecture for sensor scaling.

Technical Context

The TLC2543CDWR 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), MSB/LSB-first bit, and unipolar/bipolar mode bit - synchronized to the I/O CLOCK input.

Conversion timing is tightly coupled to the I/O CLOCK: sampling begins on the fourth falling edge, ends on the last falling edge, and EOC transitions low to initiate the internal 12-bit successive-approximation cycle. The device features differential high-impedance REF+ and REF– inputs enabling ratiometric operation and isolation from supply noise.

Key Specifications

Pinout & Package

TL2543CDWR is packaged in a 20-pin SOIC (DW package), 7.5 mm × 12.8 mm body, with 0.65 mm lead pitch and tape-and-reel delivery per ordering suffix "R".

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 TLC2543CDWR provides unique integration of 11-channel multiplexing, ratiometric differential reference, self-test, and configurable data format - making it optimal for space-constrained, multi-sensor industrial DAQ where feature density and measurement flexibility outweigh raw speed or lowest cost.

Availability

TLC2543CDWR is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, energy metering subsystems, and medical sensor interfaces requiring stable component supply across long-lifecycle embedded programs.

Supply support for TLC2543CDWR 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 heritage in precision data converters and industrial-grade ICs.

The TLC2543 family was designed specifically for microcontroller-based data acquisition systems requiring high-resolution, multi-channel, serial-interface ADCs with robust noise immunity and flexible configuration - targeting industrial control, test instrumentation, and sensor fusion applications.

FAQ

What is the maximum I/O CLOCK frequency supported by the TLC2543CDWR?

The TLC2543CDWR 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 minimum pulse width is 120 ns for both high and low states, and transition times must remain ≤1 µs to ensure reliable timing margin. Exceeding 4.1 MHz may cause setup/hold violations or incomplete sampling.

Does the TLC2543CDWR require an external sample-and-hold circuit?

No, the TLC2543CDWR 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. This eliminates the need for external S/H components and simplifies analog front-end design for the TLC2543CDWR.

How does the TLC2543CDWR handle bipolar input signals?

The TLC2543CDWR supports bipolar operation via its signed binary output mode (selected by D0 bit in the control word), where output codes are referenced to VREF/2. When configured this way, inputs below REF– convert to 0x000, inputs at REF– + VREF/2 yield 0x800, and inputs at REF+ produce 0xFFF - enabling direct digitization of AC-coupled or center-zero sensor outputs without external level-shifting.

What self-test voltages are available on the TLC2543CDWR?

The TLC2543CDWR provides three internal self-test voltages accessible via address bits: 0 V (code 0x000), mid-scale (VREF/2, code 0x800), and full-scale (VREF, code 0xFFF). These are selected using DATA INPUT address codes 1100b, 1011b, and 1101b respectively - allowing functional verification of the entire signal chain without external test equipment.

Is the TLC2543CDWR pin-compatible with other variants like TLC2543IDWR?

Yes, the TLC2543CDWR is pin-compatible with TLC2543IDWR and TLC2543MDWR - all share identical 20-pin SOIC (DW) package, pinout, and electrical interface. The primary difference is temperature rating: TLC2543CDWR is rated for 0°C to 70°C, TLC2543IDWR for –40°C to 85°C, and TLC2543MDWR for –55°C to 125°C. System-level validation is required for extended temperature operation.