Texas Instruments TLV2556IPW

Overview

TLV2556IPW from Texas Instruments is a low-power 12-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated 14-channel analog multiplexer, on-chip 4.096-V/2.048-V selectable internal reference, inherent sample-and-hold, and SPI-compatible serial interface. It delivers up to 200-kSPS throughput at 5 V and supports 11 analog input channels plus three self-test voltages for industrial data acquisition systems.

For engineers reviewing the TLV2556IPW datasheet, TLV2556IPW pinout, TLV2556IPW application, or TLV2556IPW equivalent, key selection considerations include its programmable reference source, INT/EOC status output configuration, MSB/LSB-first data format, power-down mode, and compatibility with 3–5.5-V supply rails in battery-powered instrumentation and process control interfaces.

Technical Context

The TLV2556IPW implements a switched-capacitor SAR architecture with differential high-impedance reference inputs (REF+, REF−), enabling ratiometric conversion and noise isolation. Its internal oscillator (2.56–4.15 MHz) drives conversion timing without external clock dependency.

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. The INT/EOC pin is software-configurable as interrupt-active-low or end-of-conversion-active-low, and CS enables 3-state output control with setup/hold timing validated for 15-MHz I/O CLOCK at 5 V.

Key Specifications

Pinout & Package

TSSOP-20 package (4.40 mm × 6.50 mm), thermally optimized for compact PCB layouts with exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2556IPW, ADS7822U trades resolution and integration for smaller size and lower cost, while MCP3201-I/P lacks on-chip MUX and reference-requiring additional components and board space for equivalent channel count and accuracy.

Availability

TLV2556IPW is available at Aetrix Electronics and suitable for industrial process control, portable data logging, and battery-powered instruments requiring stable component supply with long-term manufacturability.

Supply support for TLV2556IPW 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 company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TLV2556IPW belongs to TI's precision data converter product line, designed specifically for low-power, multi-channel analog sensing in resource-constrained embedded systems.

FAQ

What is the maximum sampling rate of the TLV2556IPW?

The TLV2556IPW achieves up to 200 kSPS at VCC = 5 V and I/O CLOCK = 15 MHz. At 3 V, the maximum throughput drops to 150 kSPS due to reduced internal oscillator frequency and timing margins. Conversion time is calculated as (13.5 × 1/fOSC) + 25 ns, with fOSC ranging from 2.56 MHz (2.7 V) to 4.15 MHz (5.5 V). This performance enables real-time capture of multi-sensor waveforms in industrial monitoring applications using the TLV2556IPW.

Does the TLV2556IPW require an external reference voltage?

No, the TLV2556IPW includes a factory-trimmed internal reference with selectable 2.048-V or 4.096-V output, specified at ±50 ppm/°C temperature coefficient. When using the internal reference, REF− must be connected to analog GND, and a 0.1-μF capacitor is required between REF+ and REF−. External references are supported but optional-making the TLV2556IPW suitable for space-constrained designs where reference ICs would increase BOM cost and PCB area.

How many analog input channels does the TLV2556IPW support?

The TLV2556IPW integrates a 14-channel analog multiplexer that routes 11 external analog inputs (AIN0–AIN10) plus three internal self-test voltages (0 V, mid-scale, full-scale) to the ADC core. Channel selection is controlled via 4-bit address commands sent on DATA IN. This eliminates the need for external multiplexers in multi-sensor systems, reducing design complexity and improving signal integrity compared to discrete MUX + ADC solutions using the TLV2556IPW.

Can the TLV2556IPW operate from a 3.3-V supply?

Yes, the TLV2556IPW is fully specified for operation from 2.7 V to 5.5 V, including standard 3.3-V rails. At 3.3 V, it maintains 12-bit linearity (±1 LSB INL/DNL), supports 150-kSPS throughput, and draws 2.4 mA typical supply current. The internal reference remains stable, and all digital timing parameters-including I/O CLOCK setup/hold-are guaranteed across this range. This makes the TLV2556IPW compatible with modern 3.3-V microcontrollers without level-shifting circuitry.

What is the function of the INT/EOC pin on the TLV2556IPW?

The INT/EOC pin on the TLV2556IPW is a dual-function status output configurable via configuration register CFGR1. When programmed as INT, it asserts active-low upon conversion completion and clears on the next rising edge of I/O CLOCK. When configured as EOC, it pulses active-low after the final I/O CLOCK falling edge and remains low until data is read. This flexibility allows direct connection to MCU interrupt inputs or polling-based interfaces-enhancing system responsiveness and simplifying firmware integration for the TLV2556IPW.