Texas Instruments TLV2543CDWG4

Overview

TLV2543CDWG4 from Texas Instruments is a 12-bit switched-capacitor successive-approximation analog-to-digital converter (ADC) with serial interface, 11-channel analog multiplexer, on-chip sample-and-hold, and built-in self-test modes. It delivers 10-µs conversion time across 0°C to 70°C, supports unipolar/bipolar output formats, and operates with programmable MSB/LSB-first data transfer and power-down mode. It is used in industrial sensor signal conditioning where high-resolution sampling and serial microcontroller interfacing are required.

For engineers reviewing the TLV2543CDWG4 datasheet, TLV2543CDWG4 pinout, TLV2543CDWG4 application, or TLV2543CDWG4 equivalent, key selection considerations include its 11 analog inputs, 12-bit resolution with ±1 LSB linearity error, EOC-driven timing control, CMOS-compatible serial interface (CS/I/O CLOCK/DATA INPUT/DATA OUT), and DW package compatibility with surface-mount production workflows.

Technical Context

The TLV2543CDWG4 implements a switched-capacitor SAR architecture with an internal 14-channel multiplexer selecting among 11 external analog inputs or three internal reference test voltages. Sampling begins on the fourth falling edge of I/O CLOCK and holds until the last falling edge of the selected I/O cycle (8/12/16 clocks), after which EOC goes low to initiate conversion.

Its serial interface uses three control lines (CS, I/O CLOCK, DATA INPUT) and one 3-state output (DATA OUT), supporting programmable data length (8/12/16 bits), MSB/LSB-first ordering, and unipolar/bipolar output encoding. Reference inputs (REF+, REF–) enable ratiometric operation, and differential high-impedance reference terminals isolate analog circuitry from logic noise.

Key Specifications

Pinout & Package

TLV2543CDWG4 is housed in a 20-pin SOIC (DW) package with 0.300-inch body width and gull-wing leads, suitable for automated PCB assembly and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U, TLV2543CDWG4 provides 4× resolution and integrated diagnostics at modest cost premium; compared with TLV2548CDW, it offers proven long-term availability and identical footprint but with slower conversion and older process technology.

Availability

TLV2543CDWG4 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, multi-channel data acquisition systems, and portable battery-powered test equipment requiring stable component supply and long-lifecycle support.

Supply support for TLV2543CDWG4 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 expertise in precision data converters and industrial-grade ICs.

The TLV2543CDWG4 belongs to TI's legacy precision ADC product line, designed specifically for cost-effective, high-reliability industrial and instrumentation applications requiring serial interface, multiplexing, and self-test capability.

FAQ

What is the operating temperature range for the TLV2543CDWG4?

The TLV2543CDWG4 is characterized for operation from 0°C to 70°C, as indicated by the "C" suffix in its part number. This commercial-grade temperature specification makes it suitable for indoor industrial control panels, laboratory instruments, and consumer-grade test equipment where ambient thermal conditions remain within this range. The device's 10-µs conversion time and ±1 LSB linearity error are guaranteed across this full interval.

Does the TLV2543CDWG4 require an external sample-and-hold circuit?

No, the TLV2543CDWG4 integrates an inherent sample-and-hold function that activates automatically during the I/O cycle. Sampling begins precisely on the fourth falling edge of I/O CLOCK and holds until the last falling edge of the selected I/O cycle (8/12/16 clocks), eliminating the need for external components. This simplifies design, reduces board area, and ensures timing coherence between multiplexing and conversion phases in the TLV2543CDWG4.

How does the EOC signal function in the TLV2543CDWG4?

The EOC (end-of-conversion) output on the TLV2543CDWG4 is an active-low, open-drain signal that transitions low after the final I/O CLOCK falling edge to indicate the start of conversion, then returns high when the 12-bit result is latched into the output register. This provides precise hardware synchronization for interrupt-driven reads in microcontrollers, enabling deterministic latency control without polling. EOC timing is fully specified and repeatable across temperature and supply voltage for the TLV2543CDWG4.

Can the TLV2543CDWG4 perform self-calibration or diagnostics?

Yes, the TLV2543CDWG4 includes three built-in self-test modes that convert internal reference voltages: Vref+, Vref–, and (Vref+ − Vref–)/2. These are selected via specific 4-bit addresses (B, C, D hex) applied to DATA INPUT, allowing in-system verification of ADC functionality, gain/offset tracking, and fault detection without external test equipment - a key reliability feature for the TLV2543CDWG4 in safety-critical or remote-deployed applications.

What serial interface protocol does the TLV2543CDWG4 use?

The TLV2543CDWG4 uses a proprietary 3-wire serial interface (CS, I/O CLOCK, DATA INPUT) with a 3-state DATA OUT, not standard SPI or I²C. It requires an 8-bit command word (address + control bits) followed by data shifting synchronized to I/O CLOCK edges. While functionally similar to SPI, it lacks dedicated MOSI/MISO lines and relies on bidirectional timing coordination - firmware must be tailored to the TLV2543CDWG4's specific clocking and data-length rules (8/12/16 bits).