Texas Instruments TLC2578IDW

Overview

TLC2578IDW from Texas Instruments is a 12-bit, 8-channel pseudodifferential SAR analog-to-digital converter (ADC) with SPI/DSP-compatible serial interface, ±10 V analog input range, 200-KSPS maximum throughput, and integrated 8-deep FIFO. It operates from single 5-V analog supply and 3-/5-V digital supply, targeting precision data acquisition in industrial process control and automated test equipment.

For engineers reviewing the TLC2578IDW datasheet, TLC2578IDW pinout, TLC2578IDW application, or TLC2578IDW equivalent, key selection criteria include its 12-bit resolution with ±0.5 LSB INL/DNL, hardware-configurable sampling via CSTART, built-in conversion clock (6.5 MHz internal OSC), and 24-pin SOIC (DW) package with dual AGND/AVDD and DGND/DVDD separation for noise-sensitive mixed-signal designs.

Technical Context

The TLC2578IDW implements a charge-redistribution SAR architecture with on-chip analog multiplexer selecting among eight single-ended inputs or pseudodifferential pairs. Its conversion timing supports both internal oscillator (6.5 MHz min) and external SCLK up to 25 MHz as conversion clock source, enabling flexible synchronization with host processors.

It features programmable autochannel sweep, hardware-default configuration (via SDI tied to DVDD), and three distinct sampling modes: normal short (12 SCLKs), normal long (44 SCLKs), and extended (CSTART-triggered). The 8× FIFO buffers conversion results for burst readout, reducing host processor overhead during high-throughput acquisition.

Key Specifications

Pinout & Package

Package: 24-pin SOIC (DW), 4.4 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant, rated for −40°C to +85°C operating temperature.

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 TLC2578IDW uniquely combines ±10 V direct-input capability, hardware-triggered sampling, and 8× FIFO in a 24-pin SOIC package-making it optimal for industrial DAQ where signal integrity, timing flexibility, and layout simplicity are prioritized over raw speed or minimal footprint.

Availability

TLC2578IDW is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and portable data loggers requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.

Supply support for TLC2578IDW 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 TLC2578IDW belongs to TI's precision SAR ADC product line, designed specifically for high-accuracy, low-power, multi-channel data acquisition in harsh industrial environments where reliability, noise immunity, and flexible timing control are critical.

FAQ

What is the maximum analog input voltage range supported by the TLC2578IDW?

The TLC2578IDW supports a bipolar analog input range of ±10 V, referenced to REFM (tied to AGND) and REFP (typically 4 V). This allows direct connection to industrial sensors without external level-shifting circuitry. Absolute maximum ratings permit −17 V to +17 V transient tolerance, but sustained operation must remain within ±10 V to maintain specified 12-bit linearity and avoid damage to the internal MUX and sample-and-hold circuitry of the TLC2578IDW.

Does the TLC2578IDW require an external reference voltage?

No-the TLC2578IDW does not require an external reference; it accepts externally applied REFP and REFM voltages to define its full-scale range. However, it does not generate its own reference. For ±10 V operation, REFP must be set to 4 V and REFM to AGND. Decoupling (10 µF || 0.1 µF) between REFP and REFM is mandatory to ensure stable conversion accuracy. The TLC2578IDW itself contains no internal reference; all reference-related performance depends on external component quality and layout, as documented in the SLAS262C datasheet for the TLC2578IDW.

How does the CSTART pin function in the TLC2578IDW?

The CSTART pin on the TLC2578IDW provides asynchronous, hardware-controlled sampling initiation. A high-to-low transition begins analog sampling; a subsequent low-to-high transition places the sample-and-hold in hold mode and starts conversion. Its timing is independent of CS, FS, and SCLK, enabling precise external triggering-for example, from a motor encoder or laser pulse. The low time must exceed minimum acquisition requirements, and the high time must allow full conversion completion. When unused, CSTART must be tied to DVDD to prevent floating inputs that could disrupt operation of the TLC2578IDW.

What is the purpose of the dual AGND and AVDD pins on the TLC2578IDW?

The TLC2578IDW features two AGND pins (14 and 18) and two AVDD pins (13 and 19) to minimize analog ground bounce and supply noise coupling into the sensitive SAR core and reference circuitry. These pins must be connected to a clean, low-impedance analog ground plane and analog power plane respectively-separate from DGND/DVDD. Proper star-point grounding and local 0.1 µF ceramic decoupling at each AVDD pin are essential to achieve ±0.5 LSB INL and 72 dB SINAD performance. Failure to isolate analog and digital supplies degrades the TLC2578IDW's DC and AC accuracy significantly.

Can the TLC2578IDW operate with a 3.3 V digital supply?

Yes-the TLC2578IDW supports DVDD from 2.7 V to 5.5 V, making it fully compatible with 3.3 V microcontrollers and FPGAs. Digital input thresholds scale with DVDD (VIH = 2.1 V min at 3 V), and SDO output levels meet 3.3 V logic standards. However, AVDD must remain at 5 V ±5% to maintain specified analog performance-including ±10 V input range, 12-bit linearity, and 72 dB SINAD. Mixing 3.3 V DVDD with 5 V AVDD is standard practice and explicitly validated in the SLAS262C datasheet for the TLC2578IDW.