Texas Instruments TLC2554CD

Overview

TLC2554CD from Texas Instruments is a 12-bit, 4-channel, serial analog-to-digital converter (ADC) operating from a single 5-V supply with 400 kSPS maximum throughput, ±1 LSB differential/integral nonlinearity, and built-in 4-V reference - used in industrial data acquisition systems requiring low-power, SPI-compatible digitization of sensor signals.

For engineers reviewing the TLC2554CD datasheet, TLC2554CD pinout, TLC2554CD application, or TLC2554CD equivalent, this page delivers verified technical context, real-world timing behavior, FIFO-based multi-channel sweep operation, and hardware-controlled extended sampling via CSTART - all critical for embedded control and precision measurement designs.

Technical Context

The TLC2554CD implements a 12-bit successive-approximation register (SAR) architecture with a 2-bit resistor-string DAC and charge-redistribution capacitor array. It supports both normal sampling (12 or 24 SCLK cycles) and asynchronous extended sampling triggered by the CSTART pin.

It integrates an 8-deep FIFO, programmable conversion modes (one-shot, repeat, sweep, repeat-sweep), and dual serial interface support: SPI-compatible (CS/SCLK/SDI/SDO) and DSP frame-sync (FS) modes. The EOC/(INT) pin is configurable as either end-of-conversion flag or interrupt output.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (D package), 0°C to 70°C operating temperature range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and TLC2543CN, the TLC2554CD uniquely combines 12-bit accuracy, 400 kSPS speed, hardware-triggered extended sampling, and auto power-down - making it optimal for next-generation portable and real-time embedded measurement systems.

Availability

TLC2554CD is available at Aetrix Electronics and suitable for industrial sensor monitoring, portable data loggers, motor control feedback, and test & measurement front ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLC2554CD 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer product portfolios.

The TLC2554CD belongs to TI's precision data acquisition IC family, designed specifically for low-power, high-accuracy, multi-channel analog digitization in space- and energy-constrained embedded systems.

FAQ

What is the maximum sampling rate supported by the TLC2554CD?

The TLC2554CD achieves a maximum throughput of 400 kSPS when operated with a 20-MHz SCLK and internal conversion clock. This corresponds to a minimum conversion time of 1.6 µs. Actual sustained sampling rate depends on interface overhead, FIFO management, and selected conversion mode - e.g., sweep mode with FIFO threshold = 1/4 triggers interrupt after one sample, enabling rapid channel rotation.

Does the TLC2554CD include an internal voltage reference?

Yes, the TLC2554CD integrates a 4-V internal reference usable via REFP/REFM pins. It can be selected via CFR bit D11 = 1. When enabled, external decoupling capacitors (10 µF + 0.1 µF) must be placed between REFP and REFM. The internal reference supports full-scale input ranges of 0 V to 4 V, and its accuracy is specified in the datasheet under typical operating conditions.

How does the CSTART pin function in the TLC2554CD?

The CSTART pin enables hardware-controlled extended sampling independent of SCLK and CS timing. A high-to-low transition initiates sampling; a low-to-high transition ends sampling and starts conversion. Its low time directly controls sampling duration - critical for settling high-impedance sources. When unused, CSTART must be tied to VCC to prevent floating inputs.

Can the TLC2554CD operate in pseudo-differential mode?

Yes, the TLC2554CD supports pseudo-differential input mode by setting CFR bit D7 = 1. In this mode, A1 serves as the common-mode (MINUS) input while A0–A3 act as PLUS inputs. The MINUS input accepts up to ±0.2 V ripple, enabling ground-noise rejection in noisy environments - but reduces usable channel count to three effective inputs.

What are the key differences between TLC2554CD and TLC2558CD?

The TLC2554CD has four analog inputs (A0–A3) and a 16-pin SOIC package, while the TLC2558CD offers eight inputs (A0–A7) in a 20-pin package. Both share identical core specs: 12-bit resolution, 400 kSPS, FIFO, CSTART, and power-down features. The TLC2554CD's reduced pin count and channel count make it optimal for cost- and space-sensitive 4-channel applications.