Texas Instruments TLC3541IDGKR

Overview

TLC3541IDGKR from Texas Instruments is a 14-bit, single-channel unipolar successive approximation register (SAR) analog-to-digital converter (ADC) with SPI/DSP-compatible serial interface, 200-KSPS sampling rate, ±1 LSB INL/DNL, and rail-to-rail 500 kHz analog input bandwidth. It operates from a single 5-V supply and integrates a built-in conversion clock for 2.67 µs max conversion time-used in precision industrial process control and motor control feedback loops.

For engineers reviewing the TLC3541IDGKR datasheet, TLC3541IDGKR pinout, TLC3541IDGKR application, or TLC3541IDGKR equivalent, key selection criteria include its 8-pin VSSOP package, FS-enabled DSP frame sync mode, auto-power-down (5 µA), and compatibility with TMS320 DSP serial ports and microcontroller SPI interfaces requiring CPOL=0/CPHA=1 timing.

Technical Context

The TLC3541IDGKR implements a charge-redistribution SAR architecture with internal oscillator-based conversion clocking, eliminating external timing components. Its dual-control interface supports either CS-only (SPI) or CS+FS (DSP) operation, where FS rising edge initiates sampling and synchronizes data framing to host processors.

It features rail-to-rail analog input (0–VDD), 4.096 V reference support, and strict timing compliance: 15 MHz SCLK max, 12.5 ns FS setup before SCLK, and 17-cycle SDO output window with high-impedance recovery after final bit. Power management includes automatic entry into 5 µA power-down state post-conversion.

Key Specifications

Pinout & Package

Package: 8-pin VSSOP (DGK), 3.0 mm × 3.0 mm body, 0.65 mm pitch, RoHS-compliant NIPDAUAG finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit SAR ADC applications.

Compared with ADS7822U and TLC3545IDGKR, the TLC3541IDGKR uniquely combines 14-bit precision, DSP frame sync (FS), and unipolar single-ended input-making it optimal for TMS320-based motor control where timing determinism and full-scale utilization are critical.

Availability

TLC3541IDGKR is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant VSSOP packaging.

Supply support for TLC3541IDGKR 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 expertise in precision data converters and industrial-grade ICs.

The TLC3541IDGKR belongs to TI's TLC35xx family of low-power, high-speed SAR ADCs designed specifically for real-time industrial control, motor drive, and test instrumentation applications demanding deterministic timing and minimal power overhead.

FAQ

What is the maximum SCLK frequency supported by the TLC3541IDGKR?

The TLC3541IDGKR supports serial clock frequencies up to 15 MHz, enabling fast data readout with minimal latency. At this rate, the full 14-bit conversion result is transferred in under 1 µs. This specification is validated across the full operating temperature range (−40°C to 85°C) and supply voltage (4.5–5.5 V), making the TLC3541IDGKR suitable for high-throughput real-time systems where interface speed directly impacts control loop bandwidth.

Does the TLC3541IDGKR require an external reference voltage?

Yes, the TLC3541IDGKR requires an external reference voltage applied to the REF pin (Pin 2). It accepts 4 V to VDD (max 5.5 V), with typical operation at 4.096 V. The reference directly defines the full-scale input range (0–VREF), and its stability and noise performance directly impact overall ADC accuracy. The TLC3541IDGKR does not include an internal reference, so a precision external source-such as a dedicated voltage reference IC-is necessary for metrology-grade applications.

How does the FS pin function in the TLC3541IDGKR?

The FS (frame sync) pin on the TLC3541IDGKR provides hardware-level synchronization for DSP interfacing: a rising edge on FS initiates sampling and releases the MSB to SDO, aligning conversion start with the DSP's frame boundary. This eliminates software-induced jitter and ensures deterministic timing in closed-loop motor control. When not used, FS must be tied to VDD; the TLC3541IDGKR will then operate in CS-only SPI mode, maintaining full functional compatibility.

What is the power-down behavior of the TLC3541IDGKR?

The TLC3541IDGKR automatically enters a 5 µA power-down state immediately after conversion completion, reducing average current consumption significantly during idle periods. Wake-up occurs on the next falling edge of CS (or rising edge of FS, whichever occurs first), with no additional delay-enabling rapid reactivation for burst-mode sampling. This feature is fully integrated and requires no external control signals or configuration registers, simplifying low-power system design.

Is the TLC3541IDGKR pin-compatible with other devices in the TLC35xx family?

Yes, the TLC3541IDGKR is pin-compatible with other 8-pin members of the TLC35xx family-including the 12-bit TLC3540, 14-bit TLC3545, and 16-bit TLC3548-in both SOIC (D) and VSSOP (DGK) packages. This allows resolution upgrades or functional variants (e.g., pseudo-differential vs. unipolar) without PCB layout changes. However, FS functionality is exclusive to the TLC3541, and pin assignments for analog inputs differ between TLC3541 and TLC3545 variants.