Texas Instruments TLV2556IDWRG4

Overview

TLV2556IDWRG4 from Texas Instruments is a low-power 12-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated 11-channel analog multiplexer, internal 2.048-V/4.096-V reference, and SPI-compatible serial interface. It delivers up to 200-kSPS throughput at 5 V and 150-kSPS at 3 V, features inherent sample-and-hold, programmable MSB/LSB-first output, and operates across –40°C to +85°C for industrial data acquisition.

For engineers reviewing the TLV2556IDWRG4 datasheet, TLV2556IDWRG4 pinout, TLV2556IDWRG4 application, or TLV2556IDWRG4 equivalent, key selection considerations include its 11 analog input channels with self-test modes, internal oscillator-based conversion timing, ratiometric reference inputs, and compatibility with microcontroller SPI peripherals requiring 12-bit resolution and low quiescent current.

Technical Context

The TLV2556IDWRG4 implements a switched-capacitor SAR architecture with on-chip 14-channel multiplexer (supporting 11 external analog inputs plus three internal self-test voltages), automatic sample-and-hold, and configurable INT/EOC status pin. Its control logic accepts 4-bit address/command via DATA IN synchronized to I/O CLOCK, then shifts out 12-bit conversion results on DATA OUT.

Conversion is clocked by an internal oscillator (2.56–4.15 MHz depending on VCC), eliminating need for external clock source. Reference configuration is managed through two dedicated registers: CFGR1 selects input channel or self-test mode, while CFGR2 sets reference source (internal 2.048 V or 4.096 V, or external), output data length, and power-down behavior.

Key Specifications

Pinout & Package

TLV2556IDWRG4 is packaged in a 20-pin SOIC (DW) with 7.50 mm × 12.80 mm body size, rated for industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and TLV2548IPW, the TLV2556IDWRG4 uniquely combines internal reference selection, three self-test modes, and SOIC packaging-making it optimal for industrial diagnostics and battery-powered systems where calibration traceability and layout simplicity are prioritized.

Availability

TLV2556IDWRG4 is available at Aetrix Electronics and suitable for industrial process control, portable data logging, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TLV2556IDWRG4 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 TLV2556IDWRG4 belongs to TI's low-power precision SAR ADC product line, designed specifically for multi-channel sensor interfacing in resource-constrained environments where integration, accuracy, and energy efficiency are critical.

FAQ

What is the maximum sampling rate of the TLV2556IDWRG4 under industrial operating conditions?

The TLV2556IDWRG4 achieves up to 200 kSPS at VCC = 5 V and 150 kSPS at VCC = 3 V across its full operating temperature range of –40°C to +85°C. This throughput is sustained using the internal oscillator and SPI interface with I/O CLOCK up to 15 MHz, making it suitable for real-time multi-channel acquisition in PLC modules and motor control feedback loops.

Does the TLV2556IDWRG4 require an external reference voltage, or can it operate with its internal reference?

The TLV2556IDWRG4 can operate with either its internal reference (selectable 2.048 V or 4.096 V) or an external reference applied to REF+ and REF− pins. Internal reference operation eliminates external components and supports ratiometric measurements; external reference use requires a 0.1-μF capacitor between REF+ and REF− for stability, as specified in the datasheet.

How does the TLV2556IDWRG4 handle analog input channel selection and sequencing?

The TLV2556IDWRG4 uses a 4-bit address input (DATA IN) to select among 11 analog inputs (AIN0–AIN10) or three internal self-test voltages. Channel selection is configured via Configuration Register 1 (CFGR1), and the internal 14-channel multiplexer routes the chosen signal to the ADC core prior to conversion-enabling deterministic, software-controlled scanning without external logic.

What power-saving features does the TLV2556IDWRG4 offer for battery-powered applications?

The TLV2556IDWRG4 supports both software-initiated and automatic power-down modes, reducing supply current to ≤1 μA. At 2.7 V, operating current is 2.4 mA with internal reference enabled. Combined with programmable conversion rate and low-voltage operation down to 2.7 V, these features extend battery life in portable meters and wireless sensor nodes.

Can the TLV2556IDWRG4 interface directly with standard microcontroller SPI peripherals?

Yes, the TLV2556IDWRG4 implements a SPI-compatible serial interface with CPOL = 0 and CPHA = 0, supporting I/O CLOCK frequencies up to 15 MHz. It uses CS, DATA IN, DATA OUT, and I/O CLOCK pins-requiring no protocol translation or glue logic when connecting to ARM Cortex-M, PIC, or MSP430 microcontrollers with hardware SPI modules.