Texas Instruments TLC3574IDWRG4

Overview

TLC3574IDWRG4 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, targeting precision data acquisition in industrial process control and automated test equipment.

For engineers reviewing the TLC3574IDWRG4 datasheet, TLC3574IDWRG4 pinout, TLC3574IDWRG4 application, or TLC3574IDWRG4 equivalent, key selection criteria include bipolar input support, hardware-configurable sampling period via CSTART, built-in conversion clock, INL of ±1 LSB, and DW-package thermal performance for embedded systems requiring stable DC accuracy and channel isolation.

Technical Context

The TLC3574IDWRG4 implements a successive-approximation register (SAR) architecture with on-chip analog multiplexer selecting among four single-ended inputs (A0–A3), internal signal scaling for ±10 V full-scale range, and programmable sampling modes-normal (12/44 SCLK), extended (CSTART-triggered), or autochannel sweep. Its conversion clock is either internal 6.5-MHz oscillator or external SCLK up to 25 MHz.

It supports dual serial interface protocols: SPI mode (CS, SDI, SDO, SCLK) and DSP mode (FS, SDI, SDO, SCLK), with EOC/INT output indicating data readiness and CS enabling slave-select functionality. The device features hardware-default configuration when SDI is tied to DVDD and includes internal compensation (COMP pin) and reference decoupling (REFP/REFM) requirements for stable AC performance.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (DW), RoHS-compliant, body size 7.5 mm × 12.8 mm, 1.27 mm pitch, JEDEC MS-013AC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit SAR ADC applications.

Compared with ADS8325IPW, TLC3574IDWRG4 offers 100-KSPS higher throughput and integrated FIFO for streaming; compared with TLC3578IDW, it reduces channel count and cost while retaining identical timing, accuracy, and interface behavior for 4-input systems.

Availability

TLC3574IDWRG4 is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, motor drive current sensing, and power quality monitoring requiring stable component supply across extended temperature ranges.

Supply support for TLC3574IDWRG4 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 signal chain solutions.

The TLC3574IDWRG4 belongs to TI's high-performance SAR ADC product line, designed specifically for industrial data acquisition systems demanding bipolar input support, low-power operation, and robust serial interfacing in harsh electromagnetic environments.

FAQ

What is the maximum sampling rate supported by the TLC3574IDWRG4?

The TLC3574IDWRG4 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 AVDD = 5 V, SCLK = 25 MHz, and external conversion clock disabled. Channel switching adds multiplexer settling time, reducing effective rate in multi-channel sweep configurations. The TLC3574IDWRG4 datasheet specifies this limit in Section 6, Table 3.

Does the TLC3574IDWRG4 require an external reference voltage?

No-the TLC3574IDWRG4 accepts an external differential reference via REFP and REFM pins but does not require it; it can operate with internal reference scaling when configured for ±10 V full-scale range. However, external 4 V reference is recommended for optimal SINAD (79 dB) and THD (−82 dB) performance. Decoupling with 10 µF || 0.1 µF capacitors between REFP and REFM is mandatory per the TLC3574IDWRG4 design guidelines.

How does the CSTART pin function in the TLC3574IDWRG4?

The CSTART pin on the TLC3574IDWRG4 provides hardware-controlled asynchronous sampling initiation: a high-to-low transition starts analog sampling, and a low-to-high transition places the sample-and-hold in hold mode and begins conversion. Its low pulse width directly sets acquisition time-critical for driving high-impedance sources (>25 Ω). When unused, CSTART must be tied to DVDD. This behavior is defined in the TLC3574IDWRG4 terminal functions table (Page 3).

What package type is used for the TLC3574IDWRG4?

The TLC3574IDWRG4 uses a 20-pin SOIC (DW) package per the "AVAILABLE OPTIONS" table on Page 2 of the datasheet. It measures 7.5 mm × 12.8 mm with 1.27 mm lead pitch, RoHS-compliant, and rated for −40°C to +85°C operating temperature. This DW package shares footprint compatibility with TLC3578IDW, enabling scalable design reuse.

Can the TLC3574IDWRG4 interface with both SPI and DSP hosts?

Yes-the TLC3574IDWRG4 supports dual serial protocols: SPI mode using CS, SDI, SDO, and SCLK; and DSP mode using FS, SDI, SDO, and SCLK. In SPI mode, CS acts as slave select; in DSP mode, FS signals frame start. Both modes share SDO timing and data format (MSB-first, 14-bit result). The TLC3574IDWRG4 functional block diagram (Page 2) and interface description (Page 1) confirm this dual-mode capability.