Texas Instruments TLC3578IPW

Overview

TLC3578IPW from Texas Instruments is a 14-bit, 8-channel single-ended SAR 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 control and test equipment.

For engineers reviewing the TLC3578IPW datasheet, TLC3578IPW pinout, TLC3578IPW application, or TLC3578IPW equivalent, key selection criteria include its 14-bit resolution with ±1 LSB INL, hardware-configurable sampling via CSTART, built-in conversion clock (6.5 MHz internal OSC), and TSSOP-20 package compatibility with system-level signal integrity requirements for high-speed serial ADC interfacing.

Technical Context

The TLC3578IPW integrates an on-chip 8-channel analog multiplexer, sample-and-hold with programmable sampling period (normal/short/long modes), and a charge-redistribution SAR core. Its conversion clock may be sourced internally (6.5 MHz OSC) or externally via SCLK up to 25 MHz.

It supports dual serial interface modes: SPI (CS/SDI/SDO/SCLK) and DSP (FS/SDI/SDO/SCLK), with EOC/INT output signaling conversion completion. The device implements pseudodifferential input capability and hardware default configuration when SDI is tied to DVDD.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8688IPWR and MAX11623ETL+, the TLC3578IPW uniquely balances 14-bit accuracy, 200-KSPS throughput, hardware-sampling flexibility via CSTART, and 8× FIFO-making it optimal for deterministic industrial data acquisition where timing control and buffer depth are critical.

Availability

TLC3578IPW 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, long-term lifecycle support, and traceable sourcing.

Supply support for TLC3578IPW 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 TLC3578IPW belongs to TI's precision SAR ADC product line, engineered for high-accuracy, low-power, multi-channel data acquisition in harsh industrial environments where reliability and parametric consistency are mission-critical.

FAQ

What is the maximum sampling rate achievable with the TLC3578IPW in fixed-channel mode?

The TLC3578IPW achieves a maximum throughput of 200 KSPS in fixed-channel conversion mode (mode 00 or 01) with normal long sampling. This rate assumes internal 6.5 MHz conversion clock and 25 MHz SCLK; channel-switching reduces effective rate due to MUX settling time. The TLC3578IPW specification sheet confirms this value under "Maximum Throughput" and validates it across temperature and supply conditions.

Does the TLC3578IPW support true differential input configurations?

The TLC3578IPW does not support true differential input pairs (e.g., AIN+ / AIN−). It provides pseudodifferential operation-where one channel serves as reference for another-but all eight inputs (A0–A7) are single-ended relative to AGND. The device's functional block diagram and terminal description confirm that analog inputs are routed through a single-ended MUX to the SAR core, and no differential input pins are defined in the pinout.

How is the TLC3578IPW powered, and what are the supply voltage requirements?

The TLC3578IPW requires two independent supplies: AVDD = 4.75–5.5 V (analog, typically 5 V) and DVDD = 2.7–5.5 V (digital, compatible with 3.3 V or 5 V logic). DGND and AGND must be separated on PCB and joined at a single point. The TLC3578IPW datasheet specifies these ranges in the "Absolute Maximum Ratings" and "General Electrical Characteristics" sections, with typical operation at AVDD = 5 V and DVDD = 5 V or 3.3 V.

Can the TLC3578IPW operate without external configuration after power-up?

Yes-the TLC3578IPW supports hardware-default mode: tie SDI to DVDD at power-on to initialize internal registers to factory defaults (e.g., mode 00, channel 0, internal clock). No SPI commands are needed for basic operation. This behavior is documented in the "Device Initialization" section of the TLC3578IPW datasheet and verified in the functional description and timing diagrams.

What is the role of the CSTART pin on the TLC3578IPW, and when is it required?

The CSTART pin on the TLC3578IPW provides asynchronous, hardware-controlled initiation of the sample-and-hold phase, allowing precise timing independent of SCLK. It is required when sampling high-impedance sources (>25 Ω) or when deterministic acquisition windows are needed-e.g., synchronizing to external events. The TLC3578IPW datasheet specifies CSTART's timing constraints and states it must be held high if unused.