Texas Instruments TLC4541IDRG4

Overview

TLC4541IDRG4 from Texas Instruments is a 16-bit, single-channel unipolar successive-approximation analog-to-digital converter (SAR 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 - optimized for precision industrial measurement and motor control signal acquisition.

For engineers reviewing the TLC4541IDRG4 datasheet, TLC4541IDRG4 pinout, TLC4541IDRG4 application, or TLC4541IDRG4 equivalent, key selection criteria include SPI/DSP serial interface compatibility (up to 15 MHz SCLK), auto-power-down mode (5 µA standby), built-in conversion clock (2.94 µs max conversion time), and SOIC-8 package suitability for space-constrained embedded data acquisition systems.

Technical Context

The TLC4541IDRG4 implements a charge-redistribution SAR architecture with internal oscillator-based conversion clocking, eliminating external timing components. Its unipolar input structure accepts 0 V to VDD signals referenced to an external 4.096 V–5 V reference on pin 2, supporting direct connection to sensors or signal-conditioning stages without level-shifting.

It supports three operational modes: SPI-compatible (CS-controlled), DSP frame-sync (FS-controlled), and hybrid CS+FS - enabling flexible integration with TMS320-series DSPs or microcontrollers. The device asserts MSB on SDO after CS falling edge (or FS rising edge), outputs 16-bit straight-binary data MSB-first, and returns to high-impedance state after the 17th SCLK rising edge.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (D), RoHS-compliant, MSL Level-1, −40°C to +85°C operating range. Pinout validated per SLAS293 datasheet Figure 1 (TLC4541 D/DGK top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8325IPW and TLC4541CD, the TLC4541IDRG4 uniquely combines 200-KSPS speed, DSP frame-sync support, and industrial temperature rating in an SOIC-8 package - making it the optimal choice for rugged, real-time embedded measurement systems requiring both precision and timing determinism.

Availability

TLC4541IDRG4 is available at Aetrix Electronics and suitable for industrial process control, motor control, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for TLC4541IDRG4 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 IC design.

The TLC4541IDRG4 belongs to TI's TLC45xx family of low-power, high-performance SAR ADCs engineered specifically for demanding industrial measurement, motor control, and ATE applications where resolution, speed, and interface flexibility are critical.

FAQ

What is the maximum sampling rate supported by the TLC4541IDRG4?

The TLC4541IDRG4 supports a maximum sampling rate of 200 KSPS, achieved with a 15 MHz SCLK and proper timing adherence per SLAS293. This rate is sustained continuously under recommended operating conditions (VDD = 5 V, TA = 25°C), and the built-in oscillator ensures consistent conversion timing without external clock dependencies. Each conversion completes in ≤2.94 µs, enabling tight sampling intervals in real-time control loops.

Does the TLC4541IDRG4 require an external reference voltage?

Yes, the TLC4541IDRG4 requires an external reference voltage applied to pin 2 (REF). It accepts 4.096 V to 5 V, with typical operation at 4.096 V for LSB = 62.5 µV full-scale resolution. The reference must be low-noise and well-decoupled (0.1 µF ceramic capacitor) to maintain 84.5 dB SINAD performance. No internal reference is provided - omitting the external reference will result in undefined conversion output.

How does the auto-power-down feature work on the TLC4541IDRG4?

The TLC4541IDRG4 enters auto-power-down mode automatically at the end of each conversion cycle, reducing supply current from 3.5 mA to 5 µA. It wakes up on the next falling edge of CS (or rising edge of FS for TLC4541IDRG4 in DSP mode), with negligible wake-up latency (<100 ns). This feature eliminates manual power sequencing and is fully transparent to host firmware - ideal for battery-powered or duty-cycled measurement systems.

Can the TLC4541IDRG4 interface directly with a TMS320 DSP?

Yes, the TLC4541IDRG4 is explicitly designed for direct TMS320 DSP integration via its dedicated FS (frame sync) pin (pin 7). When FS is used, the rising edge initiates sampling and presents the MSB on SDO, aligning precisely with DSP serial port framing. TI application note SPRA452 confirms this interface, and the TLC4541IDRG4's timing parameters (e.g., tsu4 = 12.5 ns setup) meet TMS320C54x/C55x requirements without glue logic.

What is the absolute maximum analog input voltage for the TLC4541IDRG4?

The absolute maximum analog input voltage for the TLC4541IDRG4 is −0.3 V to VDD + 0.3 V, per SLAS293 Absolute Maximum Ratings. For a 5-V supply, this means −0.3 V to +5.3 V. However, the functional input range is 0 V to VREF (typically 4.096 V), and exceeding VREF risks code saturation or increased DNL. Input protection diodes clamp to VDD/GND, but sustained overvoltage degrades long-term reliability and invalidates AC specifications.