Texas Instruments TLV2543CN

Overview

TLV2543CN 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 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 interfaces requiring precise ratiometric measurement via differential reference inputs.

For engineers reviewing the TLV2543CN datasheet, TLV2543CN pinout, TLV2543CN application, or TLV2543CN equivalent, key selection considerations include its 11 analog input channels, 12-bit linearity error of ±1 LSB max, EOC-synchronized serial timing, CMOS-compatible 3-state DATA OUT, and support for 8-/12-/16-bit programmable output length in embedded data acquisition systems.

Technical Context

The TLV2543CN implements a switched-capacitor successive-approximation architecture with an integrated 14-channel analog multiplexer selecting among 11 external inputs or three internal self-test voltages. Its sampling begins on the fourth falling edge of I/O CLOCK and completes on the last falling edge of the selected I/O cycle (8/12/16 clocks), after which EOC goes low to initiate conversion.

Conversion is controlled by an internal system clock synchronized to I/O CLOCK; the result is latched and EOC rises upon completion. The device features differential high-impedance REF+/REF– inputs enabling ratiometric operation, and supports software-configurable unipolar (unsigned binary) or bipolar (2's complement) output encoding based on the D0 bit in the 8-bit control register.

Key Specifications

Pinout & Package

TLV2543CN is supplied in a 20-pin plastic DIP (N) package with through-hole mounting and 0.3-inch body width.

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 TLV2543CN uniquely integrates an 11-channel MUX, EOC signaling, three self-test modes, and programmable output format - making it the only option among the three capable of autonomous multi-channel acquisition with built-in diagnostics in a single IC.

Availability

TLV2543CN is available at Aetrix Electronics and suitable for industrial automation, motor control, energy metering, and test equipment requiring stable component supply and long-term obsolescence management.

Supply support for TLV2543CN 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 TLV2543CN belongs to TI's legacy precision serial ADC product line, designed specifically for cost-effective, multi-channel data acquisition in industrial and instrumentation applications where reliability, ratiometric accuracy, and diagnostic capability are essential.

FAQ

What is the operating temperature range for the TLV2543CN?

The TLV2543CN is characterized for operation from 0°C to 70°C. This commercial-grade specification makes it suitable for indoor industrial control panels, laboratory instruments, and consumer-grade test equipment where ambient thermal conditions remain within this envelope. The TLV2543CN maintains its 10-µs conversion time and ±1 LSB linearity error across this full range without derating.

Does the TLV2543CN require an external clock source for conversion?

No, the TLV2543CN incorporates an on-chip system clock synchronized to the externally supplied I/O CLOCK. The I/O CLOCK serves dual purposes: it shifts address/control data into the device and clocks out prior conversion results, while the internal clock handles the actual 12-bit successive-approximation process. This eliminates the need for a separate crystal or oscillator, simplifying board layout and reducing BOM count for the TLV2543CN.

How does the TLV2543CN handle analog input settling during channel switching?

The TLV2543CN uses a break-before-make analog multiplexer architecture for AIN0–AIN10 selection. This prevents momentary shorting between channels during switching, minimizing crosstalk and transient injection into adjacent inputs. Combined with the automatic sample-and-hold function that captures voltage on the fourth falling edge of I/O CLOCK, the TLV2543CN ensures stable, noise-immune acquisition even when rapidly scanning multiple sensor inputs.

Can the TLV2543CN perform conversions while the host is not actively communicating?

Yes - once initiated via a valid I/O cycle, the TLV2543CN executes the conversion autonomously using its internal clock. The EOC output signals completion independently of host activity. During conversion, the TLV2543CN draws only quiescent current and holds the analog input isolated; the host may enter low-power mode and respond only upon EOC assertion, enabling efficient power management in battery-operated or energy-conscious systems.

What happens to the TLV2543CN's output data register during power-down mode?

When the TLV2543CN enters power-down mode (triggered by address 1110), all internal circuitry enters low-current standby, but the output data register retains the result of the most recent completed conversion. This preserved value remains available on DATA OUT during the next I/O cycle after exit from power-down - ensuring no loss of critical measurement data during low-power intervals. Power-down current is specified at ≤25 µA for the TLV2543CN.