Texas Instruments TLV2548IDW

Overview

TLV2548IDW from Texas Instruments is a 12-bit, 200-KSPS SAR analog-to-digital converter with built-in reference, conversion clock, and 8-word FIFO. It operates from a single 2.7-V to 5.5-V supply, supports SPI/DSP serial interfaces up to 20 MHz, and features differential/integral 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 TLV2548IDW datasheet, TLV2548IDW pinout, TLV2548IDW application, or TLV2548IDW equivalent, key selection considerations include its programmable sampling period (12/24 SCLK), hardware/software power-down modes (1 µA max), internal 2 V or 4 V reference, and extended sampling control via CSTART pin for high-impedance sources.

Technical Context

The TLV2548IDW implements a charge redistribution successive approximation register (SAR) ADC architecture with an integrated analog multiplexer supporting eight single-ended analog inputs (A0–A7). Its conversion clock can be sourced from either the internal oscillator or externally via SCLK (divided by 1, 2, or 4), enabling conversion times as low as 3.86 µs.

It supports four conversion modes-single-shot, repeat, sweep, and repeat-sweep-with FIFO-triggered interrupts and configurable auto-channel sequencing. The EOC/(INT) pin functions as either end-of-conversion flag or interrupt output, and the CSTART pin enables asynchronous, hardware-controlled sampling independent of SCLK timing.

Key Specifications

Pinout & Package

TLV2548IDW is packaged in a 20-pin SOIC (DW) body with 0.300-inch width, RoHS-compliant lead finish, and −40°C to +85°C industrial temperature rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2548IDW, ADS7822U trades resolution and integration for lower cost and smaller footprint, while TLV2544IDW offers direct pin-and-code compatibility with reduced channel count-both serve distinct trade-offs in channel density, precision, and embedded feature requirements.

Availability

TLV2548IDW is available at Aetrix Electronics and suitable for industrial sensor monitoring, motor control feedback, portable data loggers, and test & measurement equipment requiring stable component supply across extended temperature ranges.

Supply support for TLV2548IDW 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 digital signal technologies for industrial, automotive, and communications markets.

The TLV2548IDW belongs to TI's precision data acquisition portfolio, designed specifically for low-power, high-resolution industrial sensing and control applications where integration, flexibility, and reliability are critical.

FAQ

What is the maximum sampling rate supported by the TLV2548IDW?

The TLV2548IDW achieves a maximum throughput of 200 KSPS under optimal conditions-using external SCLK at 20 MHz with short sampling (12 SCLKs) and SCLK/1 conversion clock division. This yields a minimum conversion time of 3.86 µs. Actual sustained rate depends on interface protocol overhead and FIFO management in multi-channel sweep modes.

Does the TLV2548IDW require an external reference voltage?

No, the TLV2548IDW does not require an external reference voltage. It includes an internal reference selectable between 2 V and 4 V via the Configuration Register (CFR D10/D11). When using the internal reference, REFM must be tied to analog ground. An external reference may be applied between REFP and REFM for higher accuracy or custom full-scale ranges.

How does the CSTART pin function in the TLV2548IDW?

The CSTART pin on the TLV2548IDW provides hardware-controlled extended sampling: its falling edge initiates sampling, and its rising edge terminates sampling and starts conversion. This asynchronous control is independent of SCLK timing and is essential for accurately capturing signals from high-impedance or RC-filtered sources. CSTART operation requires internal reference selection in repeat/sweep modes.

What are the supported serial interface modes for the TLV2548IDW?

The TLV2548IDW supports two primary serial interface configurations: standard SPI (CPOL = 0, CPHA = 0) using CS and SCLK, and TI DSP frame-sync mode using FS instead of CS for frame-aligned transfers. Both modes accept MSB-first 16-bit commands (4-bit ID + 12-bit data) and support read/write to the Configuration Register and FIFO.

Can the TLV2548IDW operate with a 3.3-V supply?

Yes, the TLV2548IDW is fully specified to operate with a 3.3-V supply. Its supply range is 2.7 V to 5.5 V DC, and typical operating current is 1.0 mA at 3.3 V (with external reference). All digital I/O levels are compatible with 3.3-V logic families, and the analog input range scales linearly from 0 V to VCC, enabling direct interfacing with 3.3-V sensor outputs.