Texas Instruments TLC2578IPWR

Overview

TLC2578IPWR from Texas Instruments is a 12-bit, 8-channel pseudodifferential SAR analog-to-digital converter with SPI/DSP-compatible serial interface, ±10 V analog input range, 200-KSPS maximum throughput, and integrated 8× FIFO. It operates from single 5-V analog supply and 3-/5-V digital supply, and is used in industrial data acquisition systems requiring high channel density and low-power operation.

For engineers reviewing the TLC2578IPWR datasheet, TLC2578IPWR pinout, TLC2578IPWR application, or TLC2578IPWR equivalent, key selection considerations include its 12-bit resolution with ±0.5 LSB INL/DNL, hardware-configurable sampling (normal/short/extended), built-in conversion clock (6.5 MHz internal OSC), and TSSOP-20 package compatibility with board space-constrained signal conditioning designs.

Technical Context

The TLC2578IPWR implements a charge-redistribution SAR architecture with on-chip analog multiplexer selecting among eight single-ended inputs or pseudodifferential pairs. Its conversion timing is governed by either internal 6.5-MHz oscillator or external SCLK up to 25 MHz, supporting fixed-channel or auto-sweep modes.

It features dual ground and supply domains (AGND/AVDD and DGND/DVDD), bipolar input scaling, and configurable interrupt signaling via EOC/INT pin. The device supports both SPI (CS-initiated) and DSP (FS-initiated) serial protocols, with hardware default mode enabled 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 pad optional per TI design guidelines.

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 TLC2578IPWR uniquely combines ±10 V bipolar input, integrated conversion clock, hardware-configurable sampling, and 8× FIFO in a TSSOP-20 package-making it optimal for industrial signal acquisition where analog interface simplicity and noise resilience are critical.

Availability

TLC2578IPWR is available at Aetrix Electronics and suitable for industrial data acquisition, motor control feedback, test equipment, energy metering, and PLC I/O modules requiring stable component supply and long-term manufacturability.

Supply support for TLC2578IPWR 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 ICs.

The TLC2578IPWR belongs to TI's precision SAR ADC product line, designed specifically for high-channel-count, low-power industrial sensing applications where bipolar input range, flexible serial interface, and robust noise immunity are essential.

FAQ

What is the maximum analog input voltage range supported by the TLC2578IPWR?

The TLC2578IPWR supports a bipolar analog input range of ±10 V, enabling direct connection to industrial sensors and instrumentation without external level-shifting circuitry. Absolute maximum ratings allow −17 V to +17 V transient tolerance, but sustained operation must remain within ±10 V for specified DC accuracy and linearity performance. This range is set by the voltage difference between REFP and REFM pins, which are typically configured at +4 V and 0 V respectively.

Does the TLC2578IPWR require an external clock source for conversion?

No, the TLC2578IPWR includes a built-in 6.5-MHz internal oscillator that serves as the default conversion clock, eliminating the need for an external clock source. However, it also supports external clocking via the SCLK pin up to 25 MHz for applications requiring precise timing synchronization or higher throughput flexibility. Configuration is controlled via the CFR register, and the internal OSC remains active unless explicitly disabled.

How many analog input channels does the TLC2578IPWR support, and what configurations are available?

The TLC2578IPWR supports eight single-ended analog input channels (A0–A7). It also enables pseudodifferential operation using adjacent channel pairs (e.g., A0–A1), providing common-mode noise rejection. Channel selection is performed by the on-chip analog multiplexer under software or hardware control, and auto-sweep mode can sequentially convert all enabled channels without host intervention. No true differential input pairs are implemented-the device does not support fully differential inputs like AIN+ and AIN−.

What is the function of the CSTART pin on the TLC2578IPWR?

The CSTART pin on the TLC2578IPWR provides hardware-controlled extended sampling, allowing precise definition of the acquisition window independent of SCLK timing. A high-to-low transition initiates sampling; a low-to-high transition ends sampling and starts conversion. Its low time directly controls sampling duration-critical for high-impedance sources (>25 Ω) where normal SCLK-driven sampling may be insufficient. When unused, CSTART must be tied to DVDD.

Is the TLC2578IPWR pin-compatible with other devices in the TLC25xx/TLC35xx family?

The TLC2578IPWR shares identical pinout and package (TSSOP-20) with TLC2574IPWR, TLC3578IPWR, and TLC3574IPWR, enabling footprint reuse across 12-bit and 14-bit variants. However, resolution, INL/DNL, SINAD, and internal reference behavior differ-software and layout must account for these distinctions. Pin compatibility does not imply functional interchangeability without validation of timing, accuracy, and interface configuration requirements.