Texas Instruments TLC3541ID

Overview

TLC3541ID from Texas Instruments is a 14-bit, single-channel, unipolar successive-approximation analog-to-digital converter (SAR ADC) operating at 200 KSPS with ±1 LSB INL/DNL, rail-to-rail 500 kHz analog input bandwidth, and SPI/DSP-compatible serial interface. It features built-in conversion clock, auto-power-down (5 µA), and single 5-V supply operation-used in precision industrial process control signal acquisition.

For engineers reviewing the TLC3541ID datasheet, TLC3541ID pinout, TLC3541ID application, or TLC3541ID equivalent, key selection criteria include its 14-bit resolution with 81.5 dB SINAD at 15 kHz, FS-enabled DSP timing compatibility, SOIC-8 package footprint, and 2.67 µs max conversion time under 15 MHz SCLK.

Technical Context

The TLC3541ID implements a charge-redistribution SAR architecture with internal oscillator-based conversion clocking, eliminating external timing components. Its dual-control interface supports both SPI (CS-driven) and TMS320 DSP (FS-synchronized) modes, with MSB-first serial output on SDO and configurable frame sync initiation via pin 7 (FS).

It operates exclusively in unipolar single-ended mode (AIN to GND), distinct from the pseudo-differential TLC3545ID. Input sampling occurs over 20 SCLK cycles, followed by 2.67 µs conversion; output data reflects the prior sample cycle, requiring precise CS/FS edge coordination to avoid premature termination yielding 3FC0h reset code.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (D), RoHS-compliant, MSL Level-1, −40°C to +85°C operating range, marked "3541I".

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8325IPW and TLC3545ID, the TLC3541ID uniquely balances 200 KSPS throughput, DSP-compatible FS timing, and unipolar simplicity-making it optimal for cost-sensitive, real-time industrial controllers where single-ended sensors dominate.

Availability

TLC3541ID is available at Aetrix Electronics and suitable for industrial process control, motor control feedback, and ATE system channel applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC-8 packaging.

Supply support for TLC3541ID 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 TLC3541ID belongs to TI's legacy high-performance SAR ADC family designed specifically for real-time industrial signal acquisition-emphasizing low power, deterministic timing, and seamless integration with both microcontrollers and TMS320 DSPs.

FAQ

What is the maximum SCLK frequency supported by the TLC3541ID?

The TLC3541ID supports SCLK frequencies up to 15 MHz, enabling fast serial data transfer with tight timing margins. At this rate, the minimum SCLK cycle time is 66 ns, and setup/hold times (e.g., tsu1 = 15 ns, th1 = 3 ns) remain easily achievable with standard microcontrollers. This allows full 14-bit data readout within ~1.33 µs, aligning with the device's 200 KSPS capability. The TLC3541ID maintains specified AC performance-including 81.5 dB SINAD-only when operated within these validated timing limits.

Does the TLC3541ID require an external clock for conversion?

No, the TLC3541ID does not require an external clock for conversion-it integrates a built-in oscillator that generates the internal conversion clock. This eliminates external timing components and ensures a guaranteed maximum conversion time of 2.67 µs across temperature and supply voltage. The external SCLK is used solely for serial interface timing, not for the SAR conversion process itself. The TLC3541ID's self-clocked architecture simplifies system design and improves timing predictability compared to externally clocked ADCs.

Can the TLC3541ID operate in pseudo-differential mode like the TLC3545ID?

No, the TLC3541ID is strictly a single-channel unipolar ADC and does not support pseudo-differential input operation. Its AIN pin accepts only a single-ended signal referenced to GND (0 V to VDD). In contrast, the TLC3545ID provides dedicated AIN(+) and AIN(−) pins for pseudo-differential measurement. Attempting to use the TLC3541ID in differential configurations will result in incorrect conversion results. For applications requiring common-mode noise rejection, the TLC3545ID-or another purpose-built differential ADC-must be selected instead of the TLC3541ID.

What is the function of the FS pin on the TLC3541ID, and is it mandatory?

The FS (frame sync) pin on the TLC3541ID is an optional input used exclusively in TMS320 DSP interface mode to indicate the start of a serial data frame; a low-to-high transition releases the MSB onto SDO. It is not mandatory-the TLC3541ID operates fully in SPI mode using only CS and SCLK, with FS tied to VDD. When unused, FS must be connected to VDD to prevent floating inputs. Its presence enables tighter synchronization in multi-device DSP systems but adds no value in microcontroller-based SPI implementations.

How does the auto-power-down feature work on the TLC3541ID?

The TLC3541ID automatically enters power-down mode (3–5 µA supply current) at the end of each conversion cycle and remains there until the next valid CS falling edge (or FS rising edge, if enabled). Wake-up is fast-no additional delay is required before initiating the next sample-and the device is fully operational within one SCLK cycle. This feature reduces average power consumption in burst-sampling applications without compromising latency or requiring explicit control commands. The TLC3541ID's auto-power-down behavior is intrinsic and requires no configuration bits or register writes.