Texas Instruments TLC2574IPWG4

Overview

TLC2574IPWG4 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 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 control and test equipment.

For engineers reviewing the TLC2574IPWG4 datasheet, TLC2574IPWG4 pinout, TLC2574IPWG4 application, or TLC2574IPWG4 equivalent, key selection considerations include its 12-bit resolution, hardware-configurable sampling period via CSTART, built-in conversion clock, bipolar input capability, and TSSOP-20 package compatibility with space-constrained PCB layouts.

Technical Context

The TLC2574IPWG4 implements a successive approximation register (SAR) architecture with on-chip analog multiplexer supporting four single-ended inputs (A0–A3), internal signal scaling for ±10 V full-scale range, and programmable autochannel sweep. Its conversion clock may be sourced internally (6.5 MHz oscillator) or externally via SCLK up to 25 MHz.

Serial communication uses CS/FS-initiated SPI or DSP framing, with EOC/INT output signaling conversion completion. The device supports normal (12 or 44 SCLK) and extended (CSTART-triggered) sampling modes, and includes hardware default configuration when SDI is tied to DVDD - eliminating software initialization in basic use cases.

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (PW), 4.4 mm × 6.5 mm, 0.65 mm pitch, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11131ETE+, the TLC2574IPWG4 uniquely combines 12-bit accuracy, ±10 V bipolar input, CSTART-triggered sampling, and hardware-default operation - making it optimal for industrial systems requiring robust, low-maintenance analog acquisition without external clock or reference components.

Availability

TLC2574IPWG4 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and programmable logic controller I/O modules requiring stable component supply and long-term production continuity.

Supply support for TLC2574IPWG4 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, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and industrial-grade ICs.

The TLC2574IPWG4 belongs to TI's precision SAR ADC product line, designed specifically for high-reliability industrial data acquisition where bipolar input range, low power, and hardware-configurable timing are essential.

FAQ

What is the absolute maximum analog input voltage for the TLC2574IPWG4?

The TLC2574IPWG4 has an absolute maximum analog input voltage rating of −17 V to +17 V, exceeding its operational ±10 V range. This margin protects against transient overvoltage events in industrial environments. However, sustained operation outside ±10 V will cause clipping and invalid conversion results. Always limit input signals to ±10 V using external clamping or scaling circuits for reliable performance.

Does the TLC2574IPWG4 require an external reference voltage?

No, the TLC2574IPWG4 does not require an external reference - it operates with an internal reference derived from AVDD, but external REFP/REFM connections are mandatory to define the ±10 V full-scale range. The device expects 10 µF || 0.1 µF decoupling between REFP and REFM. Using internal reference alone is not supported; REFP and REFM must be externally configured per the datasheet.

Can the TLC2574IPWG4 interface directly with a 3.3-V microcontroller SPI port?

Yes, the TLC2574IPWG4 supports 3-V digital supply (DVDD = 2.7–5.5 V), so it interfaces directly with 3.3-V microcontrollers. Digital inputs accept VIH ≥ 2.1 V (at DVDD = 3 V), and outputs drive VOH ≥ 2.4 V at −0.2 mA load. No level-shifting is needed. Ensure DGND and AGND are properly partitioned and joined at a single point to maintain noise immunity during mixed-voltage operation.

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

The CSTART pin on the TLC2574IPWG4 enables extended sampling by directly controlling the sample-and-hold aperture time - independent of SCLK frequency. For sensors with source impedance >25 Ω, this prevents charge injection errors and settling inaccuracies that occur during fixed SCLK-based sampling. A low pulse width on CSTART sets precise acquisition duration, ensuring full settling before conversion begins.

Is the TLC2574IPWG4 pin-compatible with the TLC3574 series?

No, the TLC2574IPWG4 is not pin-compatible with the TLC3574 series. Although both share the same 20-pin TSSOP (PW) package footprint and pin numbering, the TLC3574 has eight analog inputs (A0–A7) versus four (A0–A3) on the TLC2574IPWG4. Pins A4–A7 on TLC3574 are functional inputs but are no-connect (NC) on TLC2574IPWG4. PCB layout must match the specific variant's pin map.