Texas Instruments TLV2543CDB

Overview

TLV2543CDB from Texas Instruments is a 12-bit 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 operates from 0°C to 70°C, delivers 10-µs conversion time, supports unipolar/bipolar output formats, and features programmable MSB/LSB-first data transfer for microcontroller interfacing in industrial sensor acquisition systems.

For engineers reviewing the TLV2543CDB datasheet, TLV2543CDB pinout, TLV2543CDB application, or TLV2543CDB equivalent, key selection considerations include its 12-bit resolution with ±1 LSB linearity error, differential high-impedance reference inputs enabling ratiometric measurement, 3-state serial output compatible with SPI-like host interfaces, and support for 8-/12-/16-bit programmable output length.

Technical Context

The TLV2543CDB implements a switched-capacitor successive-approximation architecture synchronized to an external I/O CLOCK, with sampling initiated on the fourth falling edge and held until the last clock edge of the I/O cycle. Its internal 14-channel multiplexer selects among 11 analog inputs or three self-test voltages using a break-before-make topology to minimize channel crosstalk.

Control is managed via three digital inputs - CS, DATA INPUT, and I/O CLOCK - with an 8-bit input register defining channel address (D7–D4), data length (D3–D2), MSB/LSB-first mode (D1), and unipolar/bipolar format (D0). The EOC output signals conversion start and completion, and the device supports software-initiated power-down mode reducing ICC to ≤25 µA.

Key Specifications

Pinout & Package

TLV2543CDB is housed in a 20-pin SOIC (DB) package with 0.300-inch body width and standard JEDEC MO-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2543CDB, ADS7822U offers higher speed but no multiplexer or self-test, while MAX11131AUT+ integrates a precision reference but sacrifices input channel count and diagnostic capability - TLV2543CDB remains optimal for cost-sensitive, multi-sensor systems requiring on-board verification.

Availability

TLV2543CDB is available at Aetrix Electronics and suitable for industrial process monitoring, automotive sensor interface, portable data logging, and test & measurement equipment requiring stable component supply across commercial temperature grades.

Supply support for TLV2543CDB 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 ADC design heritage.

The TLV2543CDB belongs to TI's legacy precision serial ADC product line, engineered for cost-effective, multi-channel data acquisition in resource-constrained embedded systems with emphasis on ease of integration and diagnostic capability.

FAQ

What is the maximum recommended source impedance for analog inputs on the TLV2543CDB?

The TLV2543CDB specifies a maximum analog source impedance of 50 Ω when operating at 4.1-MHz I/O CLOCK frequency. This ensures the 60-pF internal sampling capacitor charges fully within the sampling window. Higher impedances may cause gain error or reduced effective resolution due to incomplete settling - external op-amp buffering is recommended for high-impedance sensors.

Does the TLV2543CDB support true SPI communication?

The TLV2543CDB uses a 3-wire serial interface compatible with SPI timing conventions but is not a full SPI slave: it lacks dedicated SCLK, MOSI, and MISO lines. Instead, it shares DATA INPUT and DATA OUT on a single bidirectional line controlled by CS and I/O CLOCK. Host firmware must implement custom bit-banging or use SPI peripherals in master mode with careful timing alignment to the I/O CLOCK signal.

How does the TLV2543CDB handle power-down mode entry and exit?

The TLV2543CDB enters power-down mode when "1110" is clocked into the address bits (D7–D4) during the first four rising edges of I/O CLOCK. Power-down activates on the fourth falling edge, reducing ICC to ≤25 µA. Exit occurs on the next valid address; however, the first conversion after wake-up may be inaccurate due to internal settling - discarding the first result is recommended in production firmware.

Can the TLV2543CDB perform simultaneous sampling across its 11 analog inputs?

No, the TLV2543CDB does not support simultaneous sampling. It uses a single successive-approximation core with a 14-channel analog multiplexer that sequentially selects one input per conversion cycle. Sampling is time-interleaved, with each channel acquired at slightly different instants - unsuitable for phase-critical multi-channel measurements but adequate for slow-varying industrial sensor signals.

What are the absolute maximum ratings for REF+ and REF– on the TLV2543CDB?

The TLV2543CDB specifies absolute maximum ratings of VCC + 0.1 V for REF+ and –0.1 V for REF–. Exceeding these limits risks latch-up or permanent damage. For proper operation, REF+ must be ≤ VCC and ≥ REF–, and the difference (VREF+ – VREF–) must be ≥ 1 V to maintain 12-bit performance. Operation outside these bounds invalidates linearity and conversion accuracy specifications.