Texas Instruments TLV1543CDBR

Overview

TLV1543CDBR from Texas Instruments is a 10-bit successive-approximation analog-to-digital converter (ADC) with 11 analog input channels, on-chip sample-and-hold, and 3-state serial interface. It operates from a 3.3-V supply, delivers ±1 LSB total unadjusted error, and features an integrated system clock and EOC output. It is used in embedded data acquisition systems requiring low-power, multi-channel sampling with ratiometric reference support.

For engineers reviewing the TLV1543CDBR datasheet, TLV1543CDBR pinout, TLV1543CDBR application, or TLV1543CDBR equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, self-test capability details, and real-world interface timing modes - all specific to the TLV1543CDBR variant in SOIC-20 (DB) package.

Technical Context

The TLV1543CDBR implements a switched-capacitor SAR architecture with a 14-channel analog multiplexer (11 external + 3 internal self-test inputs), automatic sample-and-hold triggered on the fourth I/O CLOCK falling edge, and conversion completion signaled by EOC going low after the tenth I/O CLOCK falling edge. Its differential high-impedance reference inputs (REF+/REF−) enable ratiometric measurement and noise isolation.

It supports six serial interface timing modes defined by CS state (active-high vs. continuous-low) and I/O CLOCK count (10-, 11–16-, or 16-clock transfers), with MSB output timing varying per mode - e.g., on CS falling edge (Mode 1), EOC rising edge (Mode 2), or 16th clock falling edge (Mode 6). Conversion time is 21 µs at 1.1 MHz I/O CLOCK.

Key Specifications

Pinout & Package

TLV1543CDBR is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package (DB), with 1.27 mm pitch and 7.5 mm × 12.8 mm body dimensions. Pin functions are validated per TI SLAS072E datasheet (Rev. January 2004).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit serial ADC applications.

Compared with TLC1543CDW, TLV1543CDBR reduces supply current by ~30% and guarantees 3.3-V operation; compared with ADS7822U, it trades 2-bit resolution for integrated self-test, EOC signaling, and pin compatibility - making it optimal for cost-sensitive, diagnostics-aware 3.3-V embedded systems.

Availability

TLV1543CDBR is available at Aetrix Electronics and suitable for industrial sensor monitoring, programmable logic controller (PLC) I/O modules, and portable medical diagnostic equipment requiring stable component supply, long-lifecycle support, and commercial-temperature-grade performance.

Supply support for TLV1543CDBR 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 over 90 years of innovation in precision data conversion and industrial IC design.

The TLV1543CDBR belongs to TI's legacy precision ADC product line, engineered for reliable, low-cost, multi-channel data acquisition in commercial-grade embedded systems where serial interface simplicity and self-test capability are essential.

FAQ

What is the maximum recommended I/O CLOCK frequency for TLV1543CDBR?

The TLV1543CDBR supports up to 1.1 MHz I/O CLOCK frequency under recommended operating conditions (VCC = 3.0–5.5 V, TA = 0°C to 70°C). At this rate, conversion time remains 21 µs, and timing margins for setup/hold (e.g., tsu(CS) = 1.425 µs) are maintained. Exceeding 1.1 MHz may cause timing violations and invalid data output in the TLV1543CDBR.

Does TLV1543CDBR require an external sample-and-hold circuit?

No, the TLV1543CDBR integrates an inherent sample-and-hold function. Sampling begins automatically on the fourth falling edge of I/O CLOCK and holds on the tenth falling edge - eliminating external components. This is confirmed in the functional block diagram and "detailed description" section of the TLV1543CDBR datasheet (SLAS072E).

How does the self-test feature work in TLV1543CDBR?

The TLV1543CDBR provides three internal self-test voltages: Vref− (output code 0x000), Vref+/2 (output code 0x200), and Vref+ (output code 0x3FF). These are selected by writing address codes B (1011), C (1100), or D (1101) to the ADDRESS pin. The TLV1543CDBR converts these references identically to external analog inputs, enabling in-system validation without external stimuli.

Is TLV1543CDBR pin-compatible with TLC1543?

Yes, the TLV1543CDBR is explicitly stated as pin-compatible with the TLC1543 in the same DB (SOIC-20) package. Both share identical pin numbering, terminal functions (CS, I/O CLOCK, ADDRESS, DATA OUT, EOC, REF+, REF−, etc.), and serial protocol - enabling direct replacement in existing TLC1543 designs without PCB modification.

What is the purpose of the EOC signal in TLV1543CDBR?

The EOC (End-of-Conversion) output in TLV1543CDBR is an active-low signal that transitions low on the falling edge of the tenth I/O CLOCK pulse and remains low until conversion is complete. It provides hardware synchronization for the host processor to initiate data readback, eliminating polling delays and ensuring deterministic timing in real-time TLV1543CDBR applications.