Texas Instruments TLV2556IPWRG4

Overview

TLV2556IPWRG4 from Texas Instruments is a low-power 12-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated 11-channel analog multiplexer, on-chip 2.048-V/4.096-V selectable internal 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 TLV2556IPWRG4 datasheet, TLV2556IPWRG4 pinout, TLV2556IPWRG4 application, or TLV2556IPWRG4 equivalent, key selection considerations include its 11-channel multiplexed analog input architecture, internal reference programmability, INT/EOC status pin configuration, and compatibility with microcontroller SPI peripherals requiring 12-bit resolution and <2.5-mW active power at 3 V.

Technical Context

The TLV2556IPWRG4 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, while the 4-bit address register selects among 11 analog inputs or three self-test voltages.

Control logic accepts serial commands via CS, I/O CLOCK, and DATA IN to configure CFGR1 (input selection, test mode) and CFGR2 (reference source, output format, power-down). The 12-bit result shifts out on DATA OUT synchronized to I/O CLOCK falling edges, with programmable INT/EOC assertion timing tied to conversion completion.

Key Specifications

Pinout & Package

TSSOP-20 package (4.40 mm × 6.50 mm), lead pitch 0.65 mm, RoHS-compliant, surface-mount 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 MCP3201-I/P, the TLV2556IPWRG4 uniquely integrates 11-channel multiplexing, dual internal reference options, and three self-test modes-enabling compact, self-verifying data acquisition systems without external support components.

Availability

TLV2556IPWRG4 is available at Aetrix Electronics and suitable for industrial process control, portable data logging, and battery-powered instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for TLV2556IPWRG4 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 specializing in analog and embedded processing technologies, with leadership in precision data converters and low-power signal chain solutions.

The TLV2556IPWRG4 belongs to TI's precision SAR ADC product line, designed specifically for portable and industrial measurement systems demanding integrated multiplexing, internal references, and minimal external component count.

FAQ

What is the maximum sampling rate of the TLV2556IPWRG4 at 3 V supply?

The TLV2556IPWRG4 achieves up to 150 kSPS at VCC = 2.7–3.6 V, as specified in the "Up to 200-kSPS (150-kSPS for 3 V) Throughput" feature list and confirmed in Section 6.3 Recommended Operating Conditions. This rate assumes I/O CLOCK frequency ≤10 MHz and internal reference enabled, with conversion time of 5.54 μs at 2.7 V per electrical characteristics table.

Does the TLV2556IPWRG4 support external reference voltage sources?

Yes, the TLV2556IPWRG4 supports external reference inputs via REF+ and REF– pins. When using external reference, REF+ must be between 2 V and VCC, REF– must be within –0.1 V to 0.1 V, and a 0.1-μF capacitor is required between REF+ and REF– per Section 6.6. The device maintains 12-bit performance with external references meeting these specifications.

How many analog input channels does the TLV2556IPWRG4 provide?

The TLV2556IPWRG4 provides 11 dedicated analog input channels (AIN0 through AIN10), as stated in the "11 Analog Input Channels" feature and verified in the Pin Functions table (Pins 1–9, 11–12). These are internally multiplexed via a 14-channel analog switch matrix, with three additional inputs reserved for internal self-test voltages.

What self-test modes are available on the TLV2556IPWRG4?

The TLV2556IPWRG4 offers three built-in self-test modes activated by specific 4-bit address inputs: address 1011 produces output code 2048 (mid-scale), 1100 yields 0 (zero-scale), and 1101 yields 4095 (full-scale). These are documented in Section 6.8 Operating Characteristics and enable functional verification without external test equipment.

Is the TLV2556IPWRG4 pin-compatible with other devices in the TLV255x family?

Yes, the TLV2556IPWRG4 shares identical pinout and package (TSSOP-20) with TLV2553, TLV2554, and TLV2555 per TI's package option addendum. However, functional differences exist: TLV2553 has 4 channels, TLV2554 has 8 channels, TLV2555 has 16 channels, and only TLV2556 supports 11 channels and all three self-test modes-requiring firmware validation when substituting.