Texas Instruments TLV2556IDW

Overview

TLV2556IDW from Texas Instruments is a 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, 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 TLV2556IDW datasheet, TLV2556IDW pinout, TLV2556IDW application, or TLV2556IDW equivalent, this page provides verified technical context, real-world timing and linearity specs, validated SOIC-20 package mapping, and two confirmed alternative ADCs with documented functional and interface differences.

Technical Context

The TLV2556IDW integrates a switched-capacitor SAR core with on-chip 14-channel multiplexer supporting 11 external analog inputs (AIN0–AIN10) plus three internal self-test voltages. Its control logic accepts 4-bit address/command via DATA IN and clocks conversion results out serially on DATA OUT using I/O CLOCK, with CS enabling full-cycle synchronization.

It uses an internal oscillator (2.56–4.15 MHz) to drive conversion timing, supports unipolar/bipolar operation via REF+/REF–, and offers programmable power-down modes reducing ICC(PD) to ≤10 µA. The INT/EOC pin provides configurable status signaling-either interrupt-on-complete or end-of-conversion pulse-enabling tight host processor coordination.

Key Specifications

Pinout & Package

TLV2556IDW is packaged in a 20-pin SOIC (DW) with 7.50 mm × 12.80 mm body size, surface-mount footprint, and standard JEDEC lead pitch. Thermal resistance RθJA = 66.0°C/W enables stable operation without forced airflow in compact enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV2556IDW, ADS7822U trades resolution and integration for lower cost and smaller footprint, while MCP3201-I/P sacrifices multiplexing and speed for simplicity and ease of prototyping - neither matches the TLV2556IDW's combination of 11-channel scan, internal reference, and 200-kSPS throughput in SOIC-20.

Availability

TLV2556IDW is available at Aetrix Electronics and suitable for industrial process control, portable data logging, and battery-powered instruments requiring stable component supply, long-term manufacturability, and guaranteed traceability.

Supply support for TLV2556IDW 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, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The TLV2556IDW belongs to TI's low-power precision ADC product line, engineered specifically for battery-operated and thermally constrained applications demanding high resolution, integrated signal conditioning, and robust serial interfacing.

FAQ

What is the maximum sampling rate of the TLV2556IDW?

The TLV2556IDW achieves up to 200 kSPS at VCC = 5 V and 150 kSPS at VCC = 3 V. This throughput is enabled by its internal oscillator (2.56–4.15 MHz) and optimized 12-clock conversion cycle. Real-world performance depends on I/O CLOCK frequency, selected data length (8/12/16 bits), and source impedance - for example, 1-kΩ source yields 1000-ns channel acquisition time at 5 V.

Does the TLV2556IDW require an external reference voltage?

No, the TLV2556IDW includes an internal reference selectable between 2.048 V and 4.096 V via configuration register CFGR2. When enabled, REF− must be tied to analog GND, and a 0.1-μF capacitor is required between REF+ and REF−. External references are supported but not required - the internal option reduces system cost and board area while maintaining ±50 ppm/°C temperature stability.

How many analog input channels does the TLV2556IDW support?

The TLV2556IDW supports 11 single-ended analog input channels (labeled AIN0 through AIN10) plus three internal self-test voltages accessible via configuration register CFGR1. Its integrated 14-channel multiplexer routes one selected input to the SAR core per conversion cycle, enabling flexible scanning of multi-sensor arrays without external mux hardware.

What package type is used for the TLV2556IDW?

The TLV2556IDW is supplied in a 20-pin SOIC (DW) package with nominal dimensions of 7.50 mm × 12.80 mm. This industry-standard surface-mount outline supports reflow soldering, offers RθJA = 66.0°C/W for passive thermal management, and is pin-compatible with other TLV2556 variants in TSSOP (PW) packaging - though mechanical mounting differs.

Can the TLV2556IDW interface directly with a 3.3-V microcontroller?

Yes, the TLV2556IDW operates from 2.7 V to 5.5 V and is fully compatible with 3.3-V logic levels. Its digital I/O pins (CS, DATA IN, DATA OUT, I/O CLOCK, INT/EOC) meet VIH ≥ 2.1 V and VIL ≤ 0.6 V at VCC = 2.7–3.6 V, ensuring reliable communication with common 3.3-V MCUs. No level-shifting circuitry is required when VCC = 3.3 V.