Texas Instruments TLC2578IPWRG4

Overview

TLC2578IPWRG4 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× FIFO. It operates from 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 TLC2578IPWRG4 datasheet, TLC2578IPWRG4 pinout, TLC2578IPWRG4 application, or TLC2578IPWRG4 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 TSSOP-24 package compatibility with board-level space constraints.

Technical Context

The TLC2578IPWRG4 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 both normal (44 SCLK) and short (12 SCLK) sampling modes.

It features dual power domains (AVDD/DVDD), separate analog/digital ground pins (AGND/DGND), and configurable interface modes: CS-driven SPI (with slave select) or FS-driven DSP framing. The EOC/INT pin provides interrupt signaling, while CSTART enables asynchronous, hardware-triggered sampling independent of serial clock timing.

Key Specifications

Pinout & Package

Package: 24-pin TSSOP (PW), RoHS-compliant, body size 7.8 mm × 4.4 mm, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and ADS8320EB, the TLC2578IPWRG4 uniquely balances 12-bit accuracy, 200-KSPS speed, 8-channel flexibility, and hardware-controlled sampling-making it optimal for embedded industrial data loggers requiring deterministic timing and compact TSSOP packaging.

Availability

TLC2578IPWRG4 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, motor drive current sensing, and power quality analyzers requiring stable component supply across extended temperature ranges (−40°C to +85°C).

Supply support for TLC2578IPWRG4 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 over 90 years of innovation in precision signal chain solutions.

The TLC2578IPWRG4 belongs to TI's precision SAR ADC product line, engineered for industrial data acquisition systems demanding high linearity, flexible interface options, and robust operation in electrically noisy environments.

FAQ

What is the maximum sampling rate supported by the TLC2578IPWRG4?

The TLC2578IPWRG4 achieves a maximum throughput of 200 KSPS in fixed-channel conversion mode (00 or 01) with normal long sampling. This rate assumes internal 6.5-MHz conversion clock and accounts for multiplexer settling time. Channel-switching reduces effective rate due to additional DAC memory-effect recovery time, as specified in SLAS262C Note 2.

Does the TLC2578IPWRG4 require external reference components?

Yes, the TLC2578IPWRG4 requires external decoupling: 10 µF tantalum and 0.1 µF ceramic capacitors placed between REFP and REFM pins. REFM must be connected to AGND for ±10 V operation. The COMP pin also requires a 0.1 µF capacitor to AGND to stabilize the internal reference buffer amplifier.

Can the TLC2578IPWRG4 operate with a 3.3-V digital supply?

Yes, the TLC2578IPWRG4 supports DVDD from 2.7 V to 5.5 V, including standard 3.3-V logic levels. Digital input thresholds scale accordingly: VIH = 2.1 V min at DVDD = 3 V, and VIL = 0.6 V max. All digital I/O (CS, SCLK, SDI, SDO, FS, EOC/INT) are compatible with 3.3-V microcontrollers and FPGAs.

How does the CSTART pin function in extended sampling mode?

In extended sampling mode, the TLC2578IPWRG4 uses CSTART to control sampling duration independently of SCLK. A high-to-low transition initiates sampling; the low pulse width defines the acquisition time. A subsequent low-to-high transition places the sample-and-hold in hold mode and starts conversion. Minimum CSTART low time is specified in timing diagrams to ensure proper charge transfer.

Is the TLC2578IPWRG4 pin-compatible with the TLC3578IPWR?

No, the TLC2578IPWRG4 is not pin-compatible with the TLC3578IPWR. Although both use 24-pin TSSOP packages and share identical pin numbering and functions, the TLC3578IPWR is a 14-bit device with different internal timing, higher INL (±1 LSB), and distinct AC performance (79 dB SINAD). Layout reuse is possible, but firmware and reference design validation are required.