Texas Instruments TLC4541IDGK

Overview

TLC4541IDGK from Texas Instruments is a 16-bit, single-channel unipolar successive approximation register (SAR) analog-to-digital converter (ADC) operating from a single 5-V supply. It delivers 200-KSPS sampling rate, ±2.5 LSB max INL, 84.5 dB SINAD at 15 kHz input, and rail-to-rail analog input with 500 kHz bandwidth - enabling high-fidelity data acquisition in industrial motor control feedback loops.

For engineers reviewing the TLC4541IDGK datasheet, TLC4541IDGK pinout, TLC4541IDGK application, or TLC4541IDGK equivalent, key selection considerations include its SPI/DSP-compatible serial interface (up to 15 MHz SCLK), built-in conversion clock (2.94 µs max conversion time), auto-power-down mode (5 µA standby), and MSOP-8 package compatibility with 12/14/16-bit pin-compatible family members.

Technical Context

The TLC4541IDGK implements a charge-redistribution SAR architecture with internal oscillator-based conversion clocking, eliminating external timing components. Its unipolar input structure accepts 0 V to V_REF signals referenced to GND, supporting direct connection to sensors or signal-conditioning stages without level-shifting.

It supports three distinct serial interface modes: SPI (CS-controlled, FS tied high), DSP frame-sync (FS-controlled, CS grounded), and dual-signal (CS + FS) for multi-device TMS320 DSP bus sharing. All modes output 16-bit MSB-first data on SDO with precise timing alignment to SCLK falling edges.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm lead pitch, exposed thermal pad (not electrically connected), RoHS-compliant NiPdAuAg finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit SAR ADC applications.

Compared with ADS8320EB/2K5 and TLC4545IDGK, the TLC4541IDGK uniquely balances 200-KSPS speed, DSP-native FS synchronization, and unipolar simplicity - making it optimal for cost-sensitive, high-throughput industrial controllers where single-ended sensor interfacing dominates.

Availability

TLC4541IDGK is available at Aetrix Electronics and suitable for industrial motor control, automated test equipment (ATE), and process monitoring systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant VSSOP packaging.

Supply support for TLC4541IDGK 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 decades of precision data converter innovation.

The TLC4541IDGK belongs to TI's high-performance SAR ADC product line, designed specifically for industrial and instrumentation applications demanding 16-bit accuracy, low power, and seamless DSP/microcontroller integration.

FAQ

What is the maximum sampling rate supported by the TLC4541IDGK?

The TLC4541IDGK supports a maximum sampling rate of 200 KSPS. This is achieved using its internal oscillator-based conversion clock, which guarantees a maximum conversion time of 2.94 µs. The device maintains specified AC performance - including 84.5 dB SINAD and ±2.5 LSB INL - at this full rate when operated with V_DD = 5 V, V_REF = 4.096 V, and SCLK ≤ 15 MHz. The TLC4541IDGK achieves this without external timing components.

Does the TLC4541IDGK require an external reference voltage?

Yes, the TLC4541IDGK requires an external reference voltage applied to the REF pin (Pin 2). The reference voltage defines the full-scale input range and directly impacts absolute accuracy. The datasheet specifies a recommended range of 4.0 V to V_DD, with typical operation at 4.096 V. The TLC4541IDGK does not include an internal reference; omitting or misrouting the external reference will result in undefined or inaccurate conversion results.

How does the auto-power-down feature work on the TLC4541IDGK?

The TLC4541IDGK automatically enters a 5 µA power-down state at the end of each conversion cycle. It wakes up on the next falling edge of CS (or rising edge of FS for DSP mode), with sub-microsecond latency. This feature eliminates the need for software-controlled sleep/wake sequences. During power-down, the internal oscillator and analog circuitry are disabled, reducing total supply current from 3.5 mA to 5 µA - ideal for battery-powered or intermittently active measurement nodes.

Can the TLC4541IDGK interface directly with a TMS320 DSP serial port?

Yes, the TLC4541IDGK is explicitly optimized for TMS320 DSP interfacing via its dedicated FS (frame sync) pin (Pin 7). When CS is grounded, a rising FS edge initiates sampling and presents the MSB on SDO, aligning perfectly with DSP serial frame boundaries. This eliminates software-timed delays and jitter associated with GPIO-triggered sampling. The TLC4541IDGK datasheet provides timing diagrams and interface schematics confirming native compatibility with TMS320 C54x/C55x/C67x families.

What is the function of the FS pin on the TLC4541IDGK?

The FS (frame sync) pin on the TLC4541IDGK serves as a dedicated DSP interface trigger. A low-to-high transition on FS removes SDO from high-impedance and presents the MSB of the conversion result - enabling precise, hardware-synchronized sampling aligned to DSP frame clocks. When not used (e.g., in SPI mode), FS must be tied to V_DD. Unlike the TLC4545, the TLC4541IDGK retains separate CS and FS pins, allowing flexible multi-device bus sharing on a single DSP serial port.