Texas Instruments TLV2556IPWR

Overview

TLV2556IPWR from Texas Instruments is a low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated 14-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 TLV2556IPWR datasheet, TLV2556IPWR pinout, TLV2556IPWR application, or TLV2556IPWR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional differences, and supply support for embedded sensor interfaces and portable instrumentation designs.

Technical Context

The TLV2556IPWR implements a switched-capacitor SAR architecture with an on-chip 14-channel multiplexer supporting 11 external analog inputs (AIN0–AIN10) plus three internal self-test voltages. Its internal oscillator (2.56–4.15 MHz) drives conversion timing, eliminating need for external clock source.

Control logic accepts 4-bit address/command via DATA IN synchronized to I/O CLOCK, then shifts out 12-bit conversion result on DATA OUT. INT/EOC pin is software-configurable as interrupt or end-of-conversion flag, and REF+ and REF− pins support both internal reference (programmable 2.048 V or 4.096 V) and external reference operation with ratiometric capability.

Key Specifications

Pinout & Package

TSSOP-20 package (4.40 mm × 6.50 mm), thermally enhanced for compact PCB layouts and compatible with standard reflow profiles.

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, TLV2556IPWR uniquely combines 11-channel multiplexing, dual internal reference options, and 2.7–5.5 V operation - making it the only choice for compact, battery-aware, multi-sensor systems needing guaranteed 12-bit linearity across industrial temperature ranges.

Availability

TLV2556IPWR is available at Aetrix Electronics and suitable for industrial process control, portable data logging, and battery-powered instrumentation requiring stable component supply with long-term lifecycle assurance.

Supply support for TLV2556IPWR 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 low-power signal chains.

The TLV2556IPWR belongs to TI's TLV25xx low-power SAR ADC family, designed specifically for space-constrained, energy-sensitive applications such as handheld test equipment, sensor nodes, and portable medical devices.

FAQ

What is the maximum sampling rate of the TLV2556IPWR and under what conditions?

The TLV2556IPWR achieves up to 200 kSPS when operated at VCC = 4.5–5.5 V with I/O CLOCK frequency of 15 MHz. At 3 V supply, the maximum rate drops to 150 kSPS due to internal oscillator scaling. Conversion time is fixed at 13.5 × (1/fOSC) + 25 ns, with fOSC ranging from 2.56 MHz (2.7 V) to 4.15 MHz (5.5 V). The TLV2556IPWR maintains this performance across its full –40°C to +85°C operating range without derating.

Does the TLV2556IPWR require an external reference, or can it operate with its internal reference?

The TLV2556IPWR can operate with either its internal reference (selectable 2.048 V or 4.096 V via configuration register) or an external reference applied to REF+ and REF−. When using the internal reference, REF− must be tied to analog ground (GND), and a 0.1-µF capacitor is required between REF+ and REF−. The internal reference exhibits ±50 ppm/°C temperature coefficient and starts up in 20 ms with a 10-µF load - eliminating need for external reference ICs in most portable and industrial designs.

How many analog input channels does the TLV2556IPWR support, and how are they selected?

The TLV2556IPWR supports 11 single-ended analog input channels (AIN0 through AIN10), managed by an internal 14-channel multiplexer. Channel selection is performed via 4-bit address sent on DATA IN during each SPI frame - the address is latched on the first four rising edges of I/O CLOCK. Configuration register 1 also enables selection of three internal self-test voltages (0 V, 2.048 V, and 4.096 V), providing built-in diagnostic capability without external signal sources.

What power-saving features does the TLV2556IPWR offer, and how low does current drop in sleep mode?

The TLV2556IPWR offers software-controllable power-down mode that reduces supply current to just 0.1 µA - verified at both 2.7 V and 5 V supply. This state is entered via command sequence to configuration register and retains register settings. In active mode, typical current is 3 mA at 5 V (internal reference enabled) and 2.4 mA at 2.7 V. The device also features automatic power-down after conversion if CS remains high, further optimizing average power in burst-mode acquisition systems.

Is the TLV2556IPWR pin-compatible with other members of the TLV25xx family, such as the TLV2548?

No, the TLV2556IPWR is not pin-compatible with the TLV2548IPW or TLV2544IPW. While all share TSSOP-20 packaging, pin assignments differ significantly - for example, TLV2556IPWR places INT/EOC on pin 19 and I/O CLOCK on pin 18, whereas TLV2548IPW assigns these functions to pins 17 and 18 respectively. Signal routing, power, and reference connections are not interchangeable; PCB redesign is required when substituting between these variants.