Texas Instruments TLC3578IDW

Overview

TLC3578IDW from Texas Instruments is a 14-bit, 8-channel single-ended SAR analog-to-digital converter (ADC) with SPI/DSP-compatible serial interface, ±10 V analog input range, 200-KSPS maximum throughput, and integrated 8× FIFO. It operates from a single 5-V analog supply and 3-/5-V digital supply, targeting precision data acquisition in industrial process control systems.

For engineers reviewing the TLC3578IDW datasheet, TLC3578IDW pinout, TLC3578IDW application, or TLC3578IDW equivalent, key selection criteria include its 14-bit resolution with ±1 LSB INL, hardware-configurable sampling (normal/short/extended), built-in conversion clock, and TSSOP-24 package compatibility with industrial temperature range (−40°C to 85°C).

Technical Context

The TLC3578IDW implements a successive approximation register (SAR) architecture with on-chip analog multiplexer selecting among eight single-ended inputs or self-test voltages. Its conversion clock is either internal 6.5-MHz oscillator or external SCLK up to 25 MHz, enabling flexible timing control across host interfaces.

It supports three sampling modes: normal (automated after fourth SCLK), short (12 SCLKs), and extended (hardware-triggered via CSTART pin). The device integrates an 8-word FIFO, programmable autochannel sweep, and dual power domains (AVDD/DVDD) with independent analog/digital grounds (AGND/DGND) for noise isolation.

Key Specifications

Pinout & Package

Package: 24-pin SOIC (DW) - surface-mount, industry-standard footprint with 0.300-inch body width and 1.27 mm pitch, suitable for automated assembly and thermal management in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution SAR ADC applications.

Compared with ADS8688IPWR and AD7980BRMZ, the TLC3578IDW provides optimal balance of integrated functionality (8-channel MUX, FIFO, hardware sampling control) and industrial-grade 14-bit accuracy in a compact 24-pin SOIC, minimizing BOM count and layout complexity for cost-sensitive multi-sensor systems.

Availability

TLC3578IDW is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, and motor drive current sensing requiring stable component supply across extended production lifecycles.

Supply support for TLC3578IDW 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial interface solutions.

The TLC357x family was designed specifically for high-accuracy, low-power, multi-channel data acquisition in industrial automation, process control, and instrumentation-emphasizing integration, configurability, and robustness over wide temperature ranges.

FAQ

What is the maximum sampling rate supported by the TLC3578IDW?

The TLC3578IDW achieves a maximum throughput rate of 200 KSPS under normal long-sampling conditions with fixed-channel operation. This rate assumes internal 6.5-MHz conversion clock and accounts for multiplexer settling time; channel-switching reduces effective rate due to additional DAC memory-effect recovery time.

Does the TLC3578IDW require external reference components?

Yes, the TLC3578IDW requires external decoupling capacitors-specifically a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor-between REFP and REFM pins. These components stabilize the reference voltage and suppress noise that would otherwise degrade AC performance metrics like SINAD and THD.

Can the TLC3578IDW operate with a 3.3-V digital supply?

Yes, the TLC3578IDW supports digital supply voltages from 2.7 V to 5.5 V, including standard 3.3-V logic levels. VIH is specified at 2.1 V (min) for DVDD = 3 V, ensuring reliable recognition of high-level signals from 3.3-V microcontrollers and FPGAs without level translation.

How does the CSTART pin function in extended sampling mode?

In extended sampling mode, the CSTART pin provides hardware control of acquisition time: a high-to-low transition initiates sampling, and a low-to-high transition ends sampling and starts conversion. The low pulse width directly sets the sampling period, allowing precise adaptation to high-impedance sensor sources beyond the 25-Ω limit for normal sampling.

Is the TLC3578IDW pin-compatible with other devices in the TLC357x family?

Yes, the TLC3578IDW shares identical pinout and package (24-SOIC DW) with TLC3574IDW and TLC2578IDW. However, resolution (14-bit vs. 12-bit), INL (±1 LSB vs. ±0.5 LSB), and AC performance differ-requiring firmware validation when substituting within the same footprint.