Texas Instruments TLC2574IPW

Overview

TLC2574IPW from Texas Instruments is a 12-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× 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 test instrumentation.

For engineers reviewing the TLC2574IPW datasheet, TLC2574IPW pinout, TLC2574IPW application, or TLC2574IPW equivalent, key selection criteria include its 12-bit resolution with ±0.5 LSB INL/DNL, hardware-configurable sampling (normal/short/extended), built-in conversion clock, low-power operation (5.8 mA active, 20 µA power-down), and TSSOP-20 package compatibility with system-level signal integrity requirements.

Technical Context

The TLC2574IPW implements a successive approximation register (SAR) architecture with on-chip analog multiplexer selecting among four single-ended inputs (A0–A3), internal scaling for ±10 V full-scale range, and programmable sampling modes controlled via CSTART or SCLK timing. Its conversion clock is either internal 6.5-MHz oscillator or external SCLK up to 25 MHz.

Serial communication supports both SPI (CS/SDI/SDO/SCLK) and DSP (FS/SDI/SDO/SCLK) protocols, with frame sync (FS) enabling multi-device daisy-chaining and chip select (CS) providing slave-select functionality. The 8× FIFO buffers conversion results, reducing host processor overhead during burst acquisition sequences.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (PW), 4.4 mm × 6.5 mm body, 0.65 mm pitch, exposed pad optional.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7822U and MAX11100ETK+, the TLC2574IPW uniquely combines 12-bit ±0.5 LSB linearity, ±10 V bipolar input, hardware-synchronized sampling, and 5-V digital compatibility-making it the only option among the three that satisfies industrial-grade precision acquisition with minimal external components.

Availability

TLC2574IPW is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and motor drive current sensing requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TLC2574IPW 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 signal chain solutions.

The TLC2574IPW belongs to TI's TLC25xx family of low-power, high-accuracy SAR ADCs designed specifically for industrial automation, test instrumentation, and energy metering applications demanding robust performance under wide temperature and supply variations.

FAQ

What is the maximum analog input voltage range supported by the TLC2574IPW?

The TLC2574IPW supports a bipolar analog input range of ±10 V, defined by the voltage difference between REFP and REFM pins. Absolute maximum analog input voltage is ±17 V, but operation within ±10 V ensures specified DC accuracy (±0.5 LSB INL) and AC performance (72 dB SINAD). Exceeding ±10 V requires external clamping or scaling circuitry to avoid violating the device's linear operating region.

Does the TLC2574IPW require an external reference voltage?

Yes, the TLC2574IPW requires external reference voltages applied to REFP and REFM pins. The typical reference span is 4 V (e.g., REFP = 4 V, REFM = 0 V), establishing a ±10 V full-scale input range. Decoupling capacitors-10 µF in parallel with 0.1 µF-must be placed between REFP and REFM to ensure stable reference operation and prevent conversion noise or drift. No internal reference is provided.

How does the CSTART pin function in the TLC2574IPW?

The CSTART pin on the TLC2574IPW provides hardware-controlled asynchronous sampling initiation. A high-to-low transition starts analog sampling; a subsequent low-to-high transition places the sample-and-hold in hold mode and begins conversion. Its low-time directly sets sampling duration-critical for high-impedance sources (>25 Ω)-and operates independently of SCLK or CS/FS states, enabling precise timing-critical acquisitions.

Can the TLC2574IPW operate with a 3-V digital supply?

Yes, the TLC2574IPW supports DVDD from 2.7 V to 5.5 V, making it compatible with both 3-V and 5-V digital systems. Digital input thresholds scale accordingly: VIH = 2.1 V min at DVDD = 3 V, and VIL = 0.6 V max. However, AVDD must remain at 4.75–5.5 V for specified analog performance; the device uses separate analog and digital supplies to maintain SNR and linearity regardless of DVDD level.

What is the purpose of the COMP pin on the TLC2574IPW?

The COMP pin on the TLC2574IPW connects to the internal compensation network of the on-chip operational amplifier used in the analog front-end. A 0.1 µF capacitor must be placed between COMP and AGND to stabilize the amplifier's frequency response. Omitting this capacitor causes gain peaking, increased noise, and potential conversion errors-especially noticeable in high-frequency or high-precision applications.