Texas Instruments TLC3574IPW

Overview

TLC3574IPW from Texas Instruments is a 14-bit, 4-channel single-ended pseudodifferential SAR analog-to-digital converter with ±10 V bipolar input range, 200-KSPS maximum throughput, and SPI/DSP-compatible serial interface operating up to 25 MHz. It integrates an on-chip analog multiplexer, built-in conversion clock, and 8-word FIFO, and is used in precision industrial data acquisition systems requiring high DC accuracy and low power.

For engineers reviewing the TLC3574IPW datasheet, TLC3574IPW pinout, TLC3574IPW application, or TLC3574IPW equivalent, key selection considerations include its 14-bit resolution with ±1 LSB INL, hardware-configurable sampling (normal/short/extended), dual-supply operation (5 V AVDD / 3–5 V DVDD), and TSSOP-20 package compatibility with industrial temperature range (−40°C to 85°C).

Technical Context

The TLC3574IPW employs a charge-redistribution SAR architecture with internal oscillator (6.5 MHz typical) or external SCLK-as-conversion-clock flexibility. Its analog front-end includes a 4-input MUX, programmable sampling control via CSTART or internal timing, and bipolar signal scaling for ±10 V full-scale range referenced to REFP/REFM.

Digital interface supports both SPI (CS/SDI/SDO/SCLK) and DSP (FS/SDI/SDO/SCLK) protocols, with EOC/INT output for host synchronization and configurable autochannel sweep. The device features hardware default mode (SDI tied to DVDD), autopower-down (20 µA), and 5.8 mA normal operation current.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (PW), 4.4 mm × 6.5 mm body, 0.65 mm pitch, exposed pad not specified - suitable for compact PCB layouts with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8325IPW, TLC3574IPW offers higher throughput and integrated features at lower resolution; compared with TLC3578IPW, it provides identical performance in a smaller 4-channel footprint-ideal for space-constrained industrial nodes where channel count is fixed.

Availability

TLC3574IPW is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC3574IPW 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 TLC357x family was engineered for high-accuracy, low-power industrial data acquisition-emphasizing robust bipolar input handling, flexible digital interfacing, and seamless integration into resource-constrained embedded systems.

FAQ

What is the maximum sampling rate supported by the TLC3574IPW?

The TLC3574IPW achieves a maximum throughput of 200 KSPS under normal long-sampling conditions with fixed-channel operation. This rate assumes internal OSC clocking and accounts for multiplexer settling time. When switching channels, effective throughput decreases due to additional settling requirements. The TLC3574IPW maintains this performance across its full −40°C to +85°C operating range with AVDD = 5 V and SCLK = 25 MHz.

Does the TLC3574IPW require external reference components?

Yes, the TLC3574IPW requires external decoupling on REFP and REFM: a 10 µF tantalum (or ceramic) capacitor in parallel with a 0.1 µF ceramic capacitor between REFP and REFM. REFM must be connected to AGND. No external reference IC is needed-the device operates with this passive network to achieve ±10 V full-scale range and specified 79 dB SINAD performance.

Can the TLC3574IPW operate with a 3.3 V digital supply?

Yes, the TLC3574IPW supports DVDD from 2.7 V to 5.5 V, making it fully compatible with 3.3 V digital systems. VIH is guaranteed at 2.1 V (min) and VIL at 0.6 V (max) when DVDD = 3 V. All digital I/O-including CS, SCLK, SDI, and SDO-function correctly at 3.3 V, enabling direct interfacing with ARM Cortex-M or FPGA I/O banks without level shifting.

How does the CSTART pin affect sampling behavior in the TLC3574IPW?

The CSTART pin enables asynchronous, hardware-controlled sampling in the TLC3574IPW. A high-to-low transition initiates the sample phase; the low pulse width directly determines sampling duration-critical for high-impedance sources (>25 Ω). A low-to-high transition triggers hold-and-convert. This bypasses internal timing constraints, allowing precise synchronization with external events independent of SCLK or CS timing.

Is the TLC3574IPW pin-compatible with other devices in the TLC357x family?

Yes, the TLC3574IPW is pin-compatible with TLC2574IPW (12-bit variant) in the same PW package, sharing identical pin functions and layout. It is also footprint-compatible with TLC3578IPW, though the latter adds A4–A7 pins (unused on TLC3574IPW); those pins must be left unconnected or tied to AGND per design guidelines. No PCB revision is needed when migrating between these variants.