Texas Instruments TLV2556IPWG4

Overview

TLV2556IPWG4 from Texas Instruments is a low-power 12-bit successive-approximation analog-to-digital converter (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 TLV2556IPWG4 datasheet, TLV2556IPWG4 pinout, TLV2556IPWG4 application, or TLV2556IPWG4 equivalent, this device supports precise multi-channel voltage monitoring in battery-powered instruments, portable data loggers, and automotive sensor interfaces where serial interface simplicity, internal reference stability, and low quiescent current are critical selection criteria.

Technical Context

The TLV2556IPWG4 implements a switched-capacitor SAR architecture with an on-chip 14-channel multiplexer selecting among 11 analog inputs or three self-test voltages. Its internal oscillator (2.56–4.15 MHz) drives conversion timing, eliminating 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 provides programmable status signaling-either interrupt-on-complete (INT) or end-of-conversion (EOC)-with configurable polarity and timing alignment to the serial interface.

Key Specifications

Pinout & Package

TSSOP-20 package (4.40 mm × 6.50 mm), lead-free, RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MCP3201-I/P, the TLV2556IPWG4 uniquely integrates 11-channel multiplexing, dual internal reference options, and three self-test modes - making it the only option among the three that supports autonomous multi-sensor diagnostics in a single TSSOP-20 package.

Availability

TLV2556IPWG4 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 packaging.

Supply support for TLV2556IPWG4 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 industrial-grade signal chain solutions.

The TLV2556IPWG4 belongs to TI's low-power precision ADC product line, designed specifically for battery-constrained and thermally demanding applications where integration of multiplexer, reference, and serial interface reduces system-level component count and layout risk.

FAQ

What is the maximum sampling rate of the TLV2556IPWG4 at 3.3 V supply?

The TLV2556IPWG4 achieves up to 150 kSPS at VCC = 2.7–3.6 V, as specified in the Recommended Operating Conditions table. This rate assumes I/O CLOCK frequency ≤10 MHz and internal reference enabled. Conversion time is determined by internal oscillator frequency (2.56 MHz typical at 3.3 V), yielding ~5.54 µs per conversion - consistent with the 150-kSPS limit under these conditions. The TLV2556IPWG4 maintains full 12-bit performance at this speed.

Does the TLV2556IPWG4 support external reference inputs, and what are the voltage limits?

Yes, the TLV2556IPWG4 supports external reference inputs via REF+ and REF− pins. Per Electrical Characteristics, REF+ accepts 2 V to VCC, and REF− accepts –0.1 V to 0.1 V (relative to GND). The external reference voltage difference (REF+ − REF−) must be between 1.9 V and VCC. A 0.1-µF capacitor is required between REF+ and REF− for stability. The TLV2556IPWG4 retains full 12-bit linearity when using external references meeting these specifications.

How does the self-test functionality work on the TLV2556IPWG4?

The TLV2556IPWG4 provides three factory-calibrated self-test modes activated by writing specific 4-bit addresses to DATA IN: 1011 outputs code 2048 (mid-scale), 1100 outputs 0 (zero-scale), and 1101 outputs 4095 (full-scale). These tests verify ADC functionality, reference integrity, and digital interface without external stimuli. All self-test outputs are 12-bit unipolar codes, and the TLV2556IPWG4 performs them identically across its operating temperature range.

Can the TLV2556IPWG4 operate with MSB-first or LSB-first data output, and how is it configured?

Yes, the TLV2556IPWG4 supports both MSB-first and LSB-first output ordering, controlled by bit 3 (MSB1) in Configuration Register 1 (CFGR1). When MSB1 = 1, DATA OUT shifts the most significant bit first; when MSB1 = 0, it shifts the least significant bit first. This setting persists until rewritten and applies to all subsequent conversions. The TLV2556IPWG4 maintains correct timing alignment regardless of selection, with td7 delay (4 ns) guaranteed for both modes.

What is the power consumption of the TLV2556IPWG4 in power-down mode?

In software power-down mode (activated via CFGR1), the TLV2556IPWG4 draws 0.1–1 µA typical supply current, depending on VCC and reference configuration. At VCC = 2.7 V with internal reference disabled, ICC(PD) is 0.1 µA typical; with internal reference enabled, it rises to 1 µA. This ultra-low quiescent current enables multi-year battery life in intermittent-sampling applications. The TLV2556IPWG4 exits power-down within 20 ms after internal reference stabilization.