Texas Instruments TLV2544ID

Overview

TLV2544ID from Texas Instruments is a 12-bit, 200-KSPS successive-approximation analog-to-digital converter (ADC) with integrated reference, conversion clock, and 8-word FIFO. It operates from a single 2.7-V to 5.5-V supply, supports SPI/DSP-compatible serial interface (CPOL = 0, CPHA = 0), and delivers ±1 LSB differential/integral nonlinearity for precision data acquisition in industrial sensor interfaces.

For engineers reviewing the TLV2544ID datasheet, TLV2544ID pinout, TLV2544ID application, or TLV2544ID equivalent, key selection considerations include its 4-channel analog multiplexer, hardware-programmable sampling period (12/24 SCLKs), extended sampling via CSTART pin, 1 µA power-down current with external reference, and support for both internal (2 V or 4 V) and external reference configurations.

Technical Context

The TLV2544ID uses a charge redistribution SAR architecture with break-before-make analog multiplexer for 4-channel input selection and three internal self-test voltages. Its control logic supports four conversion modes-single-shot, repeat, sweep, and repeat-sweep-with FIFO-triggered interrupt generation at configurable fill levels (1/4, 1/2, 3/4, or full).

Sampling is programmable via CFR bits D9 (short/long) or asynchronous CSTART pin, enabling adaptation to high-impedance sources or fast SCLK (>10 MHz). Conversion clock can be sourced from internal OSC (3.86 µs max), SCLK, SCLK/2, or SCLK/4-allowing trade-offs between speed (up to 20-MHz SCLK) and sampling fidelity.

Key Specifications

Pinout & Package

TLV2544ID is packaged in a 16-pin SOIC (D package), rated for −40°C to +85°C operation. Pin functions are validated per TI SLAS198E datasheet revision June 2003.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADS7822U and TLV2544IPW, the TLV2544ID uniquely combines 4-channel MUX, 8-word FIFO, internal reference, and CSTART-triggered sampling in a 16-pin SOIC package-making it optimal for space-constrained industrial DAQ where configurability and low-power operation are critical.

Availability

TLV2544ID is available at Aetrix Electronics and suitable for industrial sensor interfaces, programmable logic controller analog input modules, and energy metering data acquisition requiring stable component supply across extended temperature ranges.

Supply support for TLV2544ID 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 over 50 years of innovation in precision data converters.

The TLV2544ID belongs to TI's TLV254x family of low-power, 12-bit SAR ADCs designed specifically for industrial automation, test equipment, and sensor signal conditioning where integration, flexibility, and wide supply range are essential.

FAQ

What is the maximum sampling rate achievable with TLV2544ID?

The TLV2544ID achieves a maximum throughput of 200 KSPS when using the external SCLK as the conversion clock source at 20 MHz with DIV = 1 (t_conv = 14 × 1 / 20 MHz ≈ 0.7 µs). This rate assumes short sampling (12 SCLKs) and accounts for total cycle time including setup, sampling, and conversion. At lower SCLK frequencies or with long sampling, throughput decreases proportionally.

Does TLV2544ID support external reference operation?

Yes, the TLV2544ID supports external reference operation via REFP and REFM pins. When CFR bit D11 = 0, the internal reference is disabled and the device uses the voltage difference between REFP and REFM as full-scale range. External reference configuration requires 10-µF and 0.1-µF decoupling capacitors between REFP and REFM, and REFM must be connected to analog ground or a stable reference midpoint.

How does the CSTART pin function in TLV2544ID sweep mode?

In sweep mode (CFR D6:D5 = 10 or 11), the CSTART pin enables extended sampling where the falling edge initiates sampling and the rising edge terminates sampling and starts conversion. This mode requires internal reference selection (CFR D11 = 1) and is valid only when CS is held high. CSTART provides precise, SCLK-independent control over sampling duration-critical for settling time after channel switching in multiplexed applications.

What are the FIFO interrupt trigger levels supported by TLV2544ID?

The TLV2544ID supports four FIFO interrupt trigger levels configured via CFR bits D1:D0: 00 = full (level 7), 01 = 3/4 (level 5), 10 = 1/2 (level 3), and 11 = 1/4 (level 1). Each level generates a falling-edge INT signal on the EOC/(INT) pin, signaling that the FIFO has reached the programmed depth and is ready for host readback-enabling efficient burst-mode data handling without continuous polling.

Can TLV2544ID operate with a 3.3-V microcontroller SPI interface?

Yes, the TLV2544ID is fully compatible with 3.3-V microcontroller SPI interfaces. Its digital I/Os (SDI, SCLK, CS, FS, PWDN, CSTART) are 5-V tolerant and accept 3.3-V logic levels. The SCLK input supports up to 20 MHz, and the device operates down to 2.7 V, allowing direct connection to 3.3-V systems without level-shifting circuitry-reducing BOM count and layout complexity.