Texas Instruments TLC2558CPWG4

Overview

TLC2558CPWG4 from Texas Instruments is a 12-bit, 400 kSPS serial analog-to-digital converter (ADC) with 8-channel analog multiplexer, built-in 4-V reference, and 8× FIFO buffer. It operates from a single 5-V supply, supports SPI/DSP-compatible serial interface up to 20 MHz SCLK, and features hardware/software/auto power-down modes (1 µA max in auto mode). It is used in industrial data acquisition systems requiring low-power, multi-channel sampling with programmable sweep sequencing.

For engineers reviewing the TLC2558CPWG4 datasheet, TLC2558CPWG4 pinout, TLC2558CPWG4 application, or TLC2558CPWG4 equivalent, key selection considerations include its 8-channel pseudo-differential/single-ended input capability, configurable sampling period (12/24 SCLKs), EOC/INT dual-function pin, FIFO-triggered interrupt levels, and compatibility with TMS320 DSP frame sync protocols.

Technical Context

The TLC2558CPWG4 implements a 12-bit successive-approximation register (SAR) ADC with binary-weighted capacitor array and 2-bit resistor-string DAC. Conversion clock is derived directly from SCLK (or SCLK/2), enabling 1.6 µs conversion time at 20 MHz. Sampling is controlled either synchronously via CS/FS edges or asynchronously via CSTART pin for extended sampling control.

It integrates an 8-channel analog multiplexer with break-before-make switching, on-chip 4-V reference (selectable via CFR.D11), and a 12-bit configuration register (CFR) that retains settings across power-down states. The device supports four conversion modes - one-shot, repeat, sweep, and repeat-sweep - with FIFO-based data buffering and programmable trigger thresholds (1/4, 1/2, 3/4, or full FIFO level).

Key Specifications

Pinout & Package

Package: 20-pin TSSOP (PW), RoHS-compliant, body size 6.5 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 serial ADC applications.

Compared with ADS7822U and TLC2543CN, the TLC2558CPWG4 delivers higher resolution, faster throughput, integrated FIFO buffering, and true auto power-down - making it optimal for new industrial and medical systems demanding precision, speed, and energy efficiency.

Availability

TLC2558CPWG4 is available at Aetrix Electronics and suitable for industrial data acquisition, motor control feedback, test equipment, and medical sensor interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TLC2558CPWG4 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 power management technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The TLC2558CPWG4 belongs to TI's legacy precision ADC product line, engineered specifically for low-power, multi-channel industrial sensing and control applications where serial interface flexibility and on-chip resource integration are critical.

FAQ

What is the maximum sampling rate supported by the TLC2558CPWG4?

The TLC2558CPWG4 achieves a maximum throughput of 400 kSPS when using a 20 MHz SCLK and the short (12 SCLK) sampling period. This rate assumes optimal analog input settling and proper decoupling of REFP/REFM. At lower SCLK frequencies or with long sampling enabled, the effective rate decreases proportionally.

Does the TLC2558CPWG4 require an external reference, or does it have an internal one?

The TLC2558CPWG4 includes a factory-trimmed 4-V internal reference usable via REFP and REFM pins. External reference operation is optional and selected via CFR bit D11. When using the internal reference, REFP and REFM must be decoupled with 10 µF and 0.1 µF capacitors.

How many analog input channels does the TLC2558CPWG4 support, and what input configurations are available?

The TLC2558CPWG4 supports eight analog input channels (A0–A7). All channels can be configured as single-ended inputs. In pseudo-differential mode (enabled via CFR.D7), A2 serves as the common-mode (MINUS) input, allowing seven differential pairs (A0–A2, A1–A2, ..., A7–A2) with ±0.2 V ripple tolerance on A2.

What is the function of the CSTART pin on the TLC2558CPWG4?

The CSTART pin provides hardware-controlled asynchronous sampling initiation. A falling edge starts analog sampling; a rising edge ends sampling and begins conversion. This enables precise timing control independent of SCLK, critical for high-impedance sources or when SCLK timing conflicts with required sampling duration.

Can the TLC2558CPWG4 interface directly with TMS320 DSP processors?

Yes - the TLC2558CPWG4 supports native TMS320 DSP interfacing via its FS (frame sync) pin. When FS is active low, data transfers use falling-edge SCLK for input and rising-edge SCLK for output, matching standard DSP serial port timing. CS may remain asserted during multi-word transfers.