Texas Instruments TLC3574IDW

Overview

TLC3574IDW from Texas Instruments is a 14-bit, 4-channel single-ended pseudodifferential 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, and is used in precision data acquisition systems requiring high linearity and low power.

For engineers reviewing the TLC3574IDW datasheet, TLC3574IDW pinout, TLC3574IDW application, or TLC3574IDW equivalent, key selection considerations include its 14-bit resolution with ±1 LSB INL, hardware-configurable sampling via CSTART, built-in conversion clock (6.5 MHz internal OSC), and DW-package compatibility with industrial temperature range (−40°C to 85°C).

Technical Context

The TLC3574IDW implements a successive-approximation register (SAR) architecture with on-chip analog multiplexer, sample-and-hold, and 4-bit command decode logic. Its conversion clock may be sourced internally (6.5 MHz OSC) or externally via SCLK up to 25 MHz.

It supports two primary serial interface modes: SPI (CS/SDI/SDO/SCLK) and DSP (FS/SDI/SDO/SCLK), with frame sync (FS) enabling multi-device synchronization. The device features programmable autochannel sweep, hardware default configuration (via SDI tied to DVDD), and extended sampling control via CSTART pin.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (DW), RoHS-compliant, body size 7.5 mm × 12.8 mm, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8325IPW, TLC3574IDW provides higher throughput and integrated features (FIFO, CSTART, internal OSC) at lower resolution; compared with TLC3574IPW, it offers identical performance in a larger, more manufacturable SOIC package with better thermal dissipation.

Availability

TLC3574IDW is available at Aetrix Electronics and suitable for industrial process monitoring, motor drive current sensing, and portable power quality analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC3574IDW 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-grade IC design.

The TLC3574IDW belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power data acquisition in harsh industrial environments where reliability, linearity, and ease of interface are critical.

FAQ

What is the maximum sampling rate supported by the TLC3574IDW?

The TLC3574IDW achieves a maximum throughput of 200 KSPS under normal long-sampling conditions with fixed-channel operation in conversion mode 00 or 01. This rate assumes optimal timing (25-MHz SCLK, internal OSC disabled) and accounts for multiplexer settling time. Channel-switching reduces effective rate due to additional DAC memory-effect recovery time, as documented in SLAS262C Note 2.

Does the TLC3574IDW require external reference components?

Yes, the TLC3574IDW requires external decoupling on its reference pins: a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor between REFP and REFM. REFM must be connected to AGND. No internal reference is provided-the device relies on externally applied differential reference voltage (typically 4 V) to define full-scale range.

Can the TLC3574IDW operate with a 3.3-V digital supply?

Yes, the TLC3574IDW supports digital supply voltages from 2.7 V to 5.5 V, making it fully compatible with 3.3-V microcontrollers and FPGAs. VIH is specified at 2.1 V (min) for DVDD = 3 V, and VOL remains below 0.4 V at 0.8-mA load-ensuring robust logic-level interoperability without level-shifting.

How does the CSTART pin function in extended sampling mode?

In extended sampling mode, the CSTART pin directly controls sampling timing: a high-to-low transition initiates analog acquisition, and a subsequent low-to-high transition places the sample-and-hold in hold mode and starts conversion. The low pulse width determines sampling duration-critical for high-impedance sources (>25 Ω)-and operates independently of CS, FS, or SCLK state.

Is the TLC3574IDW pin-compatible with the TLC2574IDW?

No, the TLC3574IDW and TLC2574IDW share identical pinout and package (DW), but differ in resolution (14-bit vs. 12-bit), INL (±1 LSB vs. ±0.5 LSB), SINAD (79 dB vs. 72 dB), and internal reference scaling. They are not drop-in replacements; firmware and system accuracy requirements must be revalidated when substituting.