Texas Instruments TLC3574IDWR

Overview

TLC3574IDWR 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 bipolar 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 TLC3574IDWR datasheet, TLC3574IDWR pinout, TLC3574IDWR application, or TLC3574IDWR equivalent, key selection criteria include its 14-bit resolution with ±1 LSB INL, hardware-configurable sampling (normal/short/extended), CSTART-triggered asynchronous acquisition, and TSSOP-20 package compatibility with space-constrained PCB layouts.

Technical Context

The TLC3574IDWR implements a successive approximation register (SAR) architecture with on-chip analog multiplexer, internal 6.5-MHz oscillator, and programmable conversion clock source (internal OSC or external SCLK up to 25 MHz). Its 4-bit command decode logic supports mode selection, channel addressing, and configuration register (CFR) writes via SDI.

It features dual ground domains (AGND/DGND), separate analog/digital supplies (AVDD/DVDD), and dedicated reference pins (REFP/REFM) supporting external 4-V reference. The CSTART pin enables precise external control of sample-and-hold timing independent of SCLK or CS/FS edges, critical for synchronized multi-channel sampling.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (DW), 4.4 mm × 6.5 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC3574IDWR, ADS8325IPW trades throughput and sampling control for 2 extra bits of resolution, while TLC3578IDW maintains identical performance with doubled channel count-both require no PCB changes but differ in firmware initialization and signal routing scope.

Availability

TLC3574IDWR is available at Aetrix Electronics and suitable for industrial process monitoring, motor drive feedback sensing, portable test equipment, and energy metering front-end designs requiring stable component supply and long-term manufacturability.

Supply support for TLC3574IDWR 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 TLC3574IDWR belongs to TI's high-performance SAR ADC product line, engineered for demanding industrial data acquisition where accuracy, timing determinism, and low-power operation are critical.

FAQ

What is the maximum sampling rate supported by the TLC3574IDWR?

The TLC3574IDWR 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, VREFP = 4 V, and SCLK = 25 MHz. Channel-switching reduces effective throughput due to multiplexer settling time, and short-sampling mode further increases speed at the cost of AC performance.

Does the TLC3574IDWR require an external reference voltage?

No-the TLC3574IDWR does not require an external reference, but it is designed to accept one. It operates with an internal reference derived from AVDD, yet achieves optimal accuracy using an external 4-V reference applied between REFP and REFM pins. The datasheet specifies 3.96–4.04 V tolerance and mandates 10 µF + 0.1 µF decoupling between those pins for stability.

Can the TLC3574IDWR interface directly with a 3.3-V microcontroller?

Yes-the TLC3574IDWR supports 3-V to 5-V digital supply (DVDD), making it fully compatible with 3.3-V microcontrollers. Digital inputs meet VIH ≥ 2.1 V and VIL ≤ 0.6 V at DVDD = 3 V, and outputs drive VOH ≥ 2.4 V at 0.2-mA load. Level-shifting is unnecessary when DVDD = 3.3 V and all digital signals share the same ground domain.

How does the CSTART pin improve sampling accuracy in high-impedance sensor applications?

The CSTART pin on the TLC3574IDWR allows external control of the sample-and-hold aperture time, decoupling acquisition duration from SCLK frequency. For sensors with source impedance >25 Ω, this prevents charge injection errors and settling inaccuracies that occur during normal SCLK-gated sampling-enabling precise capture even with thermocouples or RTDs without added op-amp buffering.

Is the TLC3574IDWR pin-compatible with other devices in the TLC357x family?

Yes-the TLC3574IDWR in DW (SOIC-20) and PW (TSSOP-20) packages shares identical pinout with TLC2574IDWR, TLC3578IDWR, and TLC2578IDWR. Pin functions A0–A3, CS, SCLK, SDI, SDO, EOC/INT, AVDD, AGND, DVDD, DGND, REFP, REFM, COMP, FS, and CSTART are functionally and physically aligned across these variants, enabling drop-in replacement within the same package option.