Texas Instruments TLC3574IDWG4

Overview

TLC3574IDWG4 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-deep 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 TLC3574IDWG4 datasheet, TLC3574IDWG4 pinout, TLC3574IDWG4 application, or TLC3574IDWG4 equivalent, key selection considerations include its 14-bit resolution with ±1 LSB INL, hardware-configurable sampling via CSTART, built-in conversion clock, and DW package compatibility with TSSOP-20 footprint constraints.

Technical Context

The TLC3574IDWG4 integrates a 4-channel analog multiplexer, sample-and-hold, successive-approximation register (SAR) core, internal 6.5-MHz oscillator, and 8× FIFO. Conversion timing supports both normal (44 SCLK) and short (12 SCLK) sampling modes, with external CSTART enabling asynchronous sampling control independent of SCLK/CS/FS timing.

Its serial interface supports dual protocols: SPI mode (CS, SDI, SDO, SCLK) and DSP mode (FS, SDI, SDO, SCLK), with frame sync (FS) or chip select (CS) initiating operation cycles. The device defaults to hardware configuration when SDI is tied to DVDD, eliminating software initialization overhead.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (DW) with 0.300-inch body width, RoHS-compliant, rated for −40°C to +85°C operating temperature.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-to-digital conversion applications.

Compared with ADS8325IPW and TLC3578IDW, the TLC3574IDWG4 delivers optimal balance of 14-bit accuracy, 200-KSPS throughput, integrated clock, and 4-channel count in a compact SOIC-20 package-making it ideal for space-constrained industrial DAQ where rapid deployment and minimal external components are critical.

Availability

TLC3574IDWG4 is available at Aetrix Electronics and suitable for industrial process monitoring, test equipment development, and automotive battery management systems requiring stable component supply across extended production lifecycles.

Supply support for TLC3574IDWG4 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 TLC3574IDWG4 belongs to TI's high-performance SAR ADC product line, engineered specifically for industrial automation, test instrumentation, and energy infrastructure applications demanding robust bipolar input handling and low-power operation.

FAQ

What is the maximum sampling rate achievable with the TLC3574IDWG4?

The TLC3574IDWG4 achieves a maximum throughput of 200 KSPS in fixed-channel conversion mode using its internal 6.5-MHz oscillator or a 25-MHz external SCLK. This rate assumes normal long sampling (44 SCLK cycles) and excludes multiplexer settling time when switching between A0–A3 channels. The actual sustained rate in multichannel sweep mode depends on configured channel count and sampling period settings.

Does the TLC3574IDWG4 require an external reference voltage?

Yes, the TLC3574IDWG4 requires external reference inputs at REFP and REFM pins to establish its ±10 V full-scale range. REFP accepts 3.96–4.04 V, while REFM must be connected to AGND. Decoupling with a 10 µF capacitor in parallel with a 0.1 µF capacitor between REFP and REFM is mandatory per the datasheet to maintain AC performance and stability.

How does the CSTART pin improve sampling accuracy for high-impedance sensors?

The CSTART pin on the TLC3574IDWG4 allows precise control over the sampling aperture time, which is essential when interfacing with sensors having output impedances exceeding 25 Ω. By asserting CSTART low for a user-defined duration, the internal sample-and-hold circuit extends acquisition time beyond the default SCLK-based window-reducing settling errors and preserving DC accuracy without requiring external op-amp buffering.

Can the TLC3574IDWG4 operate without firmware configuration?

Yes, the TLC3574IDWG4 supports hardware-default mode: tying SDI to DVDD at power-up configures the device with factory-default settings (e.g., normal long sampling, fixed A0 channel, SPI interface), enabling immediate conversion without software initialization. This feature simplifies prototyping and reduces boot-time dependencies in resource-constrained systems.

What are the thermal and packaging specifications for the TLC3574IDWG4?

The TLC3574IDWG4 is packaged in a 20-pin SOIC (DW) with 0.300-inch body width, rated for −40°C to +85°C operating temperature. Its thermal resistance (θ_JA) is 100°C/W, and maximum junction temperature is 150°C. The device uses standard JEDEC MS-013AC packaging with lead-free (RoHS-compliant) terminations and is qualified for industrial applications per TI's reliability standards.