Texas Instruments TLV2548CDWRG4

Overview

TLV2548CDWRG4 from Texas Instruments is a 12-bit, 200-KSPS SAR analog-to-digital converter 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) up to 20 MHz, and features differential nonlinearity of ±1 LSB. It is used in industrial data acquisition systems requiring high-resolution sampling of up to eight analog inputs.

For engineers reviewing the TLV2548CDWRG4 datasheet, TLV2548CDWRG4 pinout, TLV2548CDWRG4 application, or TLV2548CDWRG4 equivalent, key selection considerations include its programmable sampling period (12/24 SCLKs), extended sampling via CSTART pin, internal 2-V/4-V reference options, hardware/software power-down modes (1 µA max), and FIFO-triggered interrupt capability for buffered multi-channel acquisition.

Technical Context

The TLV2548CDWRG4 implements a charge redistribution SAR architecture with break-before-make analog multiplexer for eight selectable inputs (A0–A7) plus three internal test voltages. Its conversion clock can be sourced from internal OSC or external SCLK (divided by 1, 2, or 4), enabling conversion times as low as 3.86 µs when using internal OSC or 2.8 µs with 20-MHz SCLK.

It supports four conversion modes-single-shot, repeat, sweep, and repeat-sweep-with configurable FIFO trigger levels (1/4 to full) and programmable EOC/INT pin function. Sampling is controlled either synchronously via CS/FS edges or asynchronously via CSTART, with long sampling (24 SCLKs) recommended for high-impedance sources or >10-MHz SCLK operation.

Key Specifications

Pinout & Package

TLV2548CDWRG4 is packaged in a 20-pin SOIC (DW) body with 0.300-inch width, RoHS-compliant and lead-free per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2548CDWRG4, ADS7822U trades resolution and integration for lower cost and smaller size, while TLV2544CDW offers identical performance in a 4-channel configuration with mechanical and electrical compatibility-making it a true subset replacement where channel count permits.

Availability

TLV2548CDWRG4 is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, portable test equipment, and energy metering front-end applications requiring stable component supply and long-term manufacturability.

Supply support for TLV2548CDWRG4 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 ICs.

The TLV2548CDWRG4 belongs to TI's TLV254x family of low-power, high-performance SAR ADCs designed specifically for embedded industrial data acquisition where resolution, flexibility, and power efficiency are critical.

FAQ

What is the maximum sampling rate supported by the TLV2548CDWRG4?

The TLV2548CDWRG4 achieves a maximum throughput of 200 KSPS. This rate is attainable when using the internal oscillator as the conversion clock source and operating in single-shot or repeat mode with short sampling (12 SCLKs). At 20-MHz SCLK with SCLK/1 conversion clock, conversion time drops to 2.8 µs, enabling sustained high-speed acquisition across all eight channels when paired with appropriate FIFO management.

Does the TLV2548CDWRG4 require an external reference voltage?

No, the TLV2548CDWRG4 does not require an external reference voltage. It integrates two selectable internal references-2 V and 4 V-configured via CFR bit D10. When using internal reference, REFM must be tied to analog ground. An external reference (0.5–5.5 V differential) may be applied between REFP and REFM for enhanced accuracy or custom full-scale ranges, but it is optional-not mandatory-for functional operation.

How does the CSTART pin function in the TLV2548CDWRG4?

The CSTART pin provides hardware-controlled, asynchronous sampling initiation in the TLV2548CDWRG4. Its falling edge starts the sampling period; the low-time duration directly defines sampling length, independent of SCLK. The rising edge terminates sampling and triggers conversion. This feature is essential for precise timing alignment-such as capturing synchronized signals across isolated domains-and is supported in repeat, sweep, and repeat-sweep modes when internal reference is selected.

Can the TLV2548CDWRG4 interface directly with a TMS320 DSP processor?

Yes, the TLV2548CDWRG4 supports direct interface with TI TMS320 DSP processors via its FS (frame sync) pin. When FS is used, the falling edge initiates serial communication cycles, and data is latched on falling SCLK edges-matching standard DSP serial port timing. The device accepts DSP-style command framing and generates INT signals compatible with DSP interrupt controllers, eliminating need for glue logic or protocol translation.

What are the power consumption characteristics of the TLV2548CDWRG4 at 3.3 V?

At 3.3 V supply and with external reference enabled, the TLV2548CDWRG4 draws 1.0 mA typical during active conversion. In hardware or software power-down mode (PWDN = low), quiescent current drops to ≤1 µA. Autopower-down mode further reduces average current during idle intervals. These values are specified over the full 0°C to 70°C operating range and make the TLV2548CDWRG4 suitable for battery-powered instrumentation with strict energy budgets.