Texas Instruments TLV2543IN

Overview

TLV2543IN from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (ADC) with serial SPI-compatible interface, 11-channel analog multiplexer, and on-chip sample-and-hold. It delivers 10-µs conversion time across –40°C to 85°C, ±1 LSB linearity error, and supports unipolar/bipolar output formats. Used in industrial sensor data acquisition systems requiring precise, low-noise digitization of multiple analog signals.

For engineers reviewing the TLV2543IN datasheet, TLV2543IN pinout, TLV2543IN application, or TLV2543IN equivalent, key selection considerations include its 11 analog inputs, programmable 8/12/16-bit output length, EOC signaling, internal reference flexibility, and industrial temperature rating.

Technical Context

The TLV2543IN implements a switched-capacitor SAR architecture with an integrated 14-channel analog multiplexer (11 external + 3 internal self-test voltages). Its control logic accepts an 8-bit serial command word - including 4-bit channel address, 2-bit data-length select, LSB-first bit, and bipolar/unipolar mode - via CS/I/O CLOCK/DATA INPUT interface.

Conversion timing is tightly coupled to the I/O cycle: sampling begins on the fourth falling edge of I/O CLOCK and ends on the last falling edge (8th, 12th, or 16th), after which EOC goes low to initiate the internal conversion cycle. The device features differential high-impedance reference inputs (REF+/REF–) enabling ratiometric measurement and isolation from supply noise.

Key Specifications

Pinout & Package

TLV2543IN is housed in a 20-pin plastic DIP (N package), through-hole compatible with standard PCB assembly and prototyping workflows.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2543IN, ADS7822U trades resolution and diagnostics for speed and wider supply range, while TLV2548IPW offers integrated reference and smaller package at the cost of channel count and pin compatibility - making TLV2543IN optimal for industrial multi-sensor systems needing 11 inputs, self-test, and DIP-mounting.

Availability

TLV2543IN is available at Aetrix Electronics and suitable for industrial process monitoring, automotive sensor hubs, energy metering front-ends, and test & measurement equipment requiring stable component supply across extended temperature ranges.

Supply support for TLV2543IN 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 TLV2543IN belongs to TI's TLV254x family of serial 12-bit ADCs designed specifically for industrial and automotive applications demanding robust performance, built-in diagnostics, and flexible serial interfacing.

FAQ

What is the operating temperature range specified for the TLV2543IN?

The TLV2543IN is characterized for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This rating is explicitly defined in the datasheet's "AVAILABLE OPTIONS" table and absolute maximum ratings section, distinguishing it from the commercial-grade TLV2543CN (0°C to 70°C). The device maintains 10-µs conversion time and ±1 LSB linearity across this full range.

Does the TLV2543IN require an external reference voltage source?

No - the TLV2543IN does not require an external reference, but it does require externally applied reference voltages at REF+ and REF– pins. These can be derived from VCC (e.g., REF+ = VCC, REF– = GND) or from precision external sources. The device itself provides no internal reference; its differential reference inputs enable ratiometric operation and noise rejection, but all reference generation must be handled externally.

How many analog input channels does the TLV2543IN support, and what types are they?

The TLV2543IN supports 11 single-ended analog input channels (AIN0 through AIN10), as confirmed in the device description, functional block diagram, and terminal functions table. All 11 are externally accessible pins; three additional internal self-test voltages are selectable via address bits but are not user-accessible analog inputs. The multiplexer is break-before-make to minimize inter-channel crosstalk.

What serial interface protocol does the TLV2543IN use, and is it SPI-compatible?

The TLV2543IN uses a proprietary 3-wire serial interface (CS, I/O CLOCK, DATA INPUT/OUT) that is functionally SPI-compatible in mode 0 (CPOL = 0, CPHA = 0), though not formally labeled as SPI in the datasheet. It supports MSB-first or LSB-first data transfer, programmable output lengths (8/12/16 bits), and bidirectional command/data flow synchronized to I/O CLOCK edges - matching typical microcontroller SPI peripheral configurations.

Can the TLV2543IN perform self-calibration or built-in diagnostics?

Yes - the TLV2543IN includes three hardware self-test modes selectable via address bits (1011, 1100, 1101), applying internal reference voltages - (Vref+ − Vref–)/2, Vref–, and Vref+ - to the ADC input. These produce predictable ideal output codes (0x200, 0x000, 0x3FF in unipolar mode), enabling runtime verification of gain, offset, and functionality without external stimulus.