Texas Instruments TLV2545ID

Overview

TLV2545ID from Texas Instruments is a 12-bit, pseudo-differential-input successive approximation register (SAR) analog-to-digital converter (ADC) operating from a single 2.7-V to 5.5-V supply. It delivers up to 200 kSPS throughput with ±1 LSB INL/DNL, 72 dB SINAD at 20 kHz, and rail-to-rail analog input bandwidth of 500 kHz. Designed for low-power embedded sensing in industrial data acquisition and motor control systems, it integrates a built-in conversion clock and autopower-down mode.

For engineers reviewing the TLV2545ID datasheet, TLV2545ID pinout, TLV2545ID application, or TLV2545ID equivalent, key selection considerations include its pseudo-differential input architecture, 8-pin SOIC package, SPI/DSP-compatible serial interface, 2 μA autopower-down current at 2.7 V, and guaranteed operation across −40°C to +85°C.

Technical Context

The TLV2545ID implements a charge redistribution SAR architecture with internal oscillator-based conversion timing, achieving a fixed 3.5-μs conversion time independent of SCLK frequency. Its pseudo-differential input pair (AIN(+) on Pin 4, AIN(−) on Pin 5) supports ground noise rejection with ±0.2 V common-mode ripple tolerance.

Control logic accepts chip select (CS) only - no frame sync (FS) pin - and operates exclusively in SPI mode with MSB-first, unipolar straight-binary output. Power management includes two autopower-down states: 2 μA (fast entry, ≥0.5 μs inactive) and 1 μA (deep, ≥2 ms inactive), both triggered automatically post-conversion.

Key Specifications

Pinout & Package

TLV2545ID is housed in an 8-pin SOIC (D) package with standard 1.27 mm pitch and 3.9 mm × 4.9 mm footprint. Pin functions are validated per TI SLAS245E datasheet Figure 5 and Terminal Functions table for TLV2542/45.

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, TLV2545ID uniquely combines pseudo-differential input, built-in oscillator, and dual-threshold autopower-down in an industry-standard SOIC package - delivering superior noise immunity, timing autonomy, and energy efficiency for demanding industrial edge nodes.

Availability

TLV2545ID is available at Aetrix Electronics and suitable for industrial sensor interface, motor phase current monitoring, battery-powered data loggers, and programmable logic controller (PLC) analog input requiring stable component supply across extended temperature ranges.

Supply support for TLV2545ID 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 industrial-grade IC design.

The TLV254x family was engineered specifically for low-power, high-accuracy industrial data acquisition - emphasizing robust serial interfacing, wide supply flexibility, and thermal stability across −40°C to +85°C operation.

FAQ

What is the input configuration of the TLV2545ID?

The TLV2545ID features a pseudo-differential input structure with dedicated AIN(+) (Pin 4) and AIN(−) (Pin 5) terminals. This allows rejection of common-mode noise up to ±0.2 V on the inverted input, making it ideal for noisy industrial signal chains where true differential amplifiers are impractical. Unlike fully differential ADCs, the TLV2545ID does not require matched input impedances or symmetrical drive.

Does the TLV2545ID support frame sync (FS) signaling?

No, the TLV2545ID does not implement an FS pin or FS-controlled operation. Per the SLAS245E datasheet, TLV2545 devices operate exclusively via chip select (CS) control - identical to TLV2542 timing - and lack the FS terminal present on TLV2541. All timing, sampling, and data output initiation are governed solely by the CS falling edge and SCLK edges.

What is the minimum and maximum SCLK frequency supported by the TLV2545ID?

The TLV2545ID accepts SCLK frequencies from 100 kHz to 20 MHz, with maximum throughput dependent on supply voltage: 200 kSPS at VDD = 4.5–5.5 V and 140 kSPS at VDD = 2.7 V. The internal conversion clock (4 MHz oscillator) remains independent of SCLK, ensuring consistent 3.5-μs conversion time regardless of serial clock rate.

How does autopower-down work on the TLV2545ID?

The TLV2545ID enters autopower-down automatically after conversion completion. If inactive time exceeds 0.5 μs, current drops to 2 μA (at 2.7 V); if inactive time exceeds 2 ms, it reaches deep powerdown at 1 μA. Wake-up occurs instantly on the next CS falling edge. No software command or register write is required - the feature is fully hardware-managed.

Can the TLV2545ID operate with a 3.3 V supply and 2.5 V reference?

Yes. The TLV2545ID supports VDD = 3.3 V and VREF = 2.5 V simultaneously within its specified operating conditions (VREF min = 2 V, VDD max = 5.5 V). This configuration yields a full-scale input range of 0–2.5 V with 12-bit resolution (0.61 mV/LSB), and maintains all AC specifications including 71 dB SINAD at 150 kSPS per the datasheet's 2.7 V test condition.