Texas Instruments TLV2548CDW

Overview

TLV2548CDW 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 up to 20 MHz, and features differential/integral nonlinearity of ±1 LSB - used in industrial data acquisition systems requiring high-resolution sampling of up to eight analog inputs.

For engineers reviewing the TLV2548CDW datasheet, TLV2548CDW pinout, TLV2548CDW application, or TLV2548CDW equivalent, key selection considerations include its programmable sampling period (12/24 SCLK), hardware/software power-down modes (1 µA max), extended sampling via CSTART pin, internal 2-V/4-V reference options, and compatibility with TI DSP frame sync (FS) signaling.

Technical Context

The TLV2548CDW implements a charge-redistribution SAR architecture with break-before-make analog multiplexer for eight single-ended inputs (A0–A7). Its control logic supports four conversion modes - one-shot, repeat, sweep, and repeat-sweep - each configurable via a 12-bit CFR register with bit-defined functions for reference selection, clock source (OSC/SCLK/SCLK/2/SCLK/4), and FIFO trigger level.

Sampling is initiated either synchronously via CS/FS edges (normal mode) or asynchronously via CSTART (extended mode), where low-time of CSTART directly defines sampling duration. Conversion timing depends on clock source: 3.86 µs with internal OSC, or t_conv = 14 × DIV / f_SCLK when using external SCLK, enabling sub-µs resolution at 20 MHz.

Key Specifications

Pinout & Package

TLV2548CDW is housed in a 20-pin SOIC (DW) package with 0.300-inch body width and standard JEDEC MS-013AC footprint. Pin assignments are validated per TI SLAS198E datasheet 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 TLV2548CDW, ADS7822U trades resolution and flexibility for cost and simplicity, while TLV2544CD retains full functional equivalence in a smaller 4-channel footprint - both serve distinct segmentation needs rather than drop-in replacements.

Availability

TLV2548CDW is available at Aetrix Electronics and suitable for industrial process monitoring, motor drive current sensing, portable data loggers, and test & measurement equipment requiring stable component supply and long-lifecycle support.

Supply support for TLV2548CDW 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 TLV2548CDW belongs to TI's TLV254x family of low-power, high-performance SAR ADCs designed specifically for cost-sensitive, space-constrained industrial and instrumentation applications demanding integrated references and flexible serial interfaces.

FAQ

What is the maximum sampling rate achievable with TLV2548CDW?

The TLV2548CDW achieves a maximum throughput of 200 KSPS when configured with SCLK/2 as the conversion clock source and operating at 20 MHz SCLK. This corresponds to a minimum conversion time of 3.86 µs using the internal oscillator, or faster timing under optimized external clock conditions. The actual sustained rate depends on host interface latency and FIFO management in sweep/repeat modes.

Does TLV2548CDW support true differential input operation?

No, TLV2548CDW does not support true differential analog inputs. It provides eight single-ended analog inputs (A0–A7) and three internal self-test voltages referenced to REFP/REFM. The device uses a pseudo-differential architecture internally but accepts only single-ended signals at the A0–A7 pins. For differential signal conditioning, external instrumentation amplifiers must be used prior to connection.

Can TLV2548CDW operate with an external reference voltage?

Yes, TLV2548CDW supports external reference operation. Setting CFR bit D11 = 0 configures the device to use an external reference applied between REFP and REFM pins. The reference voltage range is 1 V to V_CC, and the analog input range becomes 0 V to V_REF. External reference usage requires proper decoupling (10 µF + 0.1 µF) and disables internal reference selection.

How does the CSTART pin function in TLV2548CDW extended sampling mode?

In extended sampling mode, the CSTART pin provides hardware-controlled sampling initiation independent of SCLK. The falling edge of CSTART (with CS high) starts sampling; the low-time determines sampling duration; and the rising edge ends sampling and triggers conversion. This mode is mandatory for repeat/sweep modes when internal reference is selected and enables precise timing alignment in real-time control applications.

Is TLV2548CDW pin-compatible with TLV2544CD?

No, TLV2548CDW is not pin-compatible with TLV2544CD. TLV2548CDW uses a 20-pin SOIC (DW) package with A0–A7, FS, and additional control pins, while TLV2544CD uses a 16-pin SOIC (D) package with only A0–A3 and no FS pin. Though functionally related, their pinouts differ significantly - direct PCB replacement requires layout revision.