Texas Instruments TLV2544CD

Overview

TLV2544CD 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 features hardware- or software-controllable sampling period. It is used in industrial data acquisition systems requiring low-power, high-resolution digitization of up to four analog inputs.

For engineers reviewing the TLV2544CD datasheet, TLV2544CD pinout, TLV2544CD application, or TLV2544CD equivalent, key selection considerations include its 12-bit resolution, 200-KSPS throughput, built-in 4-V/2-V internal reference, programmable sampling (12/24 SCLK), and support for extended sampling via dedicated CSTART pin - all within a 16-pin SOIC package rated for 0°C to 70°C operation.

Technical Context

The TLV2544CD implements a charge redistribution SAR architecture with break-before-make analog multiplexer for four input channels (A0–A3). Its conversion clock can be sourced from internal oscillator (3.86 µs typical) or external SCLK (up to 20 MHz), enabling configurable speed/power trade-offs.

It supports four conversion modes (one-shot, repeat, sweep, repeat-sweep) with FIFO-triggered interrupts and offers dual EOC/INT functionality on pin 4. Sampling is programmable (short/long) or fully asynchronous via CSTART, with internal reference selection (4 V or 2 V) and external reference option via REFP/REFM pins.

Key Specifications

Pinout & Package

TLV2544CD is housed in a 16-pin SOIC (D) package, 7.5 mm × 10.3 mm body, 1.27 mm pitch, RoHS-compliant. Pin functions are validated per SLAS198E Rev. 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, TLV2544CD delivers 4× higher resolution and integrated system features (FIFO, reference, CSTART), while TLV2544IPW offers identical performance in a different package and temperature grade - making TLV2544CD the preferred choice for cost-sensitive, commercial-temperature, SOIC-based designs.

Availability

TLV2544CD is available at Aetrix Electronics and suitable for industrial sensor monitoring, motor control feedback, portable data loggers, and test & measurement front ends requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLV2544CD 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 TLV2544CD belongs to TI's TLV254x family of low-power, high-performance SAR ADCs designed specifically for cost-sensitive, space-constrained industrial and portable instrumentation where integrated reference, FIFO, and flexible timing control are essential.

FAQ

What is the maximum sampling rate supported by the TLV2544CD?

The TLV2544CD achieves a maximum throughput of 200 KSPS under optimal conditions - using external SCLK as conversion clock (SCLK/1), short sampling (12 SCLKs), and internal reference. At 20-MHz SCLK, conversion time drops to 2.8 µs, enabling this peak rate. Actual sustained rate depends on interface overhead and FIFO management.

Does the TLV2544CD require an external reference voltage?

No, the TLV2544CD does not require an external reference. It includes a selectable internal reference of either 4 V or 2 V (configured via CFR bit D10). When using internal reference, REFM must be tied to analog ground. External reference is optional and applied differentially between REFP and REFM terminals for enhanced accuracy or ratiometric operation.

How many analog input channels does the TLV2544CD support?

The TLV2544CD supports four single-ended analog input channels (A0 through A3), as confirmed by its pinout, command set (0000b–0100b), and functional block diagram. This distinguishes it from the TLV2548 variant, which supports eight channels. The TLV2544CD's internal multiplexer routes these four inputs to the 12-bit SAR core.

What is the function of the CSTART pin on the TLV2544CD?

The CSTART pin on the TLV2544CD provides hardware-controlled, asynchronous sampling initiation. Its falling edge starts sampling; rising edge ends sampling and triggers conversion - independent of SCLK timing. This enables precise control over acquisition window duration, especially critical for high-impedance sources or synchronization with external events in the TLV2544CD design.

Can the TLV2544CD operate with a 3.3-V supply?

Yes, the TLV2544CD is fully specified for operation from 2.7 V to 5.5 V, including 3.3-V nominal supplies. At 3.3 V with external reference, its operating current is 1.0 mA, and analog input range spans 0 V to 3.3 V. All digital interfaces (SPI, FS) and internal functions remain fully functional across this range, making TLV2544CD compatible with modern 3.3-V microcontrollers.