Texas Instruments TLC2578IDWG4

Overview

TLC2578IDWG4 from Texas Instruments is a 12-bit, 8-channel pseudodifferential SAR analog-to-digital converter with SPI/DSP-compatible serial interface, ±10 V bipolar 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 TLC2578IDWG4 datasheet, TLC2578IDWG4 pinout, TLC2578IDWG4 application, or TLC2578IDWG4 equivalent, key selection criteria include its 12-bit resolution with ±0.5 LSB INL/DNL, hardware-configurable sampling (normal/short/extended), CSTART-triggered asynchronous acquisition, and TSSOP-24 package compatibility with board-level signal integrity constraints.

Technical Context

The TLC2578IDWG4 implements a charge-redistribution SAR architecture with on-chip analog multiplexer selecting among eight single-ended inputs or pseudodifferential pairs. Its internal 6.5-MHz oscillator serves as default conversion clock, but external SCLK up to 25 MHz may be used for timing-critical applications.

It supports three serial interface modes: SPI (CS-driven), DSP (FS-driven), and hardware-default (SDI tied to DVDD). The 4-bit command decoder interprets ID[15:12] to configure conversion mode, channel select, and FIFO access-enabling programmable autochannel sweep and repeat without host processor intervention.

Key Specifications

Pinout & Package

Package: 24-pin TSSOP (DW) with exposed thermal pad; RoHS-compliant, JEDEC MO-153 compliant, 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 MAX11131ETE+, the TLC2578IDWG4 uniquely combines 12-bit ±0.5 LSB accuracy, 8-channel pseudodifferential input, CSTART-triggered acquisition, and 8× FIFO in a 24-pin TSSOP-making it optimal for industrial DAQ requiring deterministic timing and bipolar signal fidelity.

Availability

TLC2578IDWG4 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, data acquisition systems, and motor drive current sensing requiring stable component supply and long-term production continuity.

Supply support for TLC2578IDWG4 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 50 years of innovation in precision data converters.

The TLC2578IDWG4 belongs to TI's precision SAR ADC product line, designed specifically for high-fidelity industrial data acquisition where bipolar input range, low power, and flexible serial interfacing are critical.

FAQ

What is the maximum sampling rate supported by the TLC2578IDWG4?

The TLC2578IDWG4 supports a maximum throughput rate of 200 KSPS under normal long-sampling conditions with fixed-channel operation. This rate assumes internal 6.5-MHz conversion clock and accounts for multiplexer settling time. When switching channels, effective rate decreases due to additional settling requirements. The device maintains this performance across its full −40°C to +85°C operating temperature range, with AVDD = 5 V and SCLK = 25 MHz.

Does the TLC2578IDWG4 require external reference components?

Yes, the TLC2578IDWG4 requires external reference components: decoupling capacitors (10 µF in parallel with 0.1 µF) must be placed between REFP and REFM pins to ensure stable reference voltage. The device does not include an internal reference; REFP and REFM define the ±10 V full-scale range. No external reference IC is needed if the system provides clean, regulated ±10 V references, but proper bypassing is mandatory for specified AC performance.

Can the TLC2578IDWG4 operate with a 3.3-V digital supply?

Yes, the TLC2578IDWG4 supports DVDD from 2.7 V to 5.5 V, making it fully compatible with 3.3-V digital systems. VIH is specified at 2.1 V (min) for DVDD = 3 V, ensuring reliable logic-level recognition from standard 3.3-V MCUs. Digital I/O remains functional across this range, though SCLK frequency must remain ≤25 MHz regardless of DVDD level. Analog supply AVDD must still be 5 V ±5%.

How does the CSTART pin function in extended sampling mode on the TLC2578IDWG4?

In extended sampling mode, the CSTART pin on the TLC2578IDWG4 provides hardware-controlled initiation of the sample-and-hold cycle: a high-to-low transition starts analog acquisition, and a subsequent low-to-high transition places the S/H in hold mode and begins conversion. The low-time duration directly controls sampling period length-enabling precise alignment with slow-settling sensors. CSTART operation is independent of CS and FS states and must be asserted after the 11th SCLK edge per datasheet timing rules.

Is the TLC2578IDWG4 pin-compatible with the TLC3578IDW?

No, the TLC2578IDWG4 is not pin-compatible with the TLC3578IDW. Although both use 24-pin TSSOP (DW) packages and share identical pin numbering and basic signal assignments (e.g., SCLK, CS, SDO), the TLC3578IDW has two additional analog inputs (A6, A7) routed to pins 15 and 16, whereas those pins are assigned to REFP and REFM on the TLC2578IDWG4. Swapping them would cause reference and analog input conflicts, requiring PCB redesign.