Texas Instruments TLV2545IDGKR

Overview

TLV2545IDGKR from Texas Instruments is a 12-bit pseudo-differential 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 sensor interfaces in industrial data acquisition and portable instrumentation.

For engineers reviewing the TLV2545IDGKR datasheet, TLV2545IDGKR pinout, TLV2545IDGKR application, or TLV2545IDGKR equivalent, key selection criteria include its pseudo-differential input architecture, autopower-down current as low as 2 µA at 2.7 V, SPI/DSP-compatible serial interface with MSOP-8 packaging, and guaranteed 12-bit monotonicity across −40°C to +85°C.

Technical Context

The TLV2545IDGKR implements a charge redistribution SAR ADC core with an integrated 4 MHz internal oscillator, enabling fixed 3.5 µs conversion time independent of external clock frequency. Its pseudo-differential input stage accepts AIN(+) and AIN(−) on pins 4 and 5 respectively, supporting ground noise rejection with ±0.2 V common-mode ripple tolerance.

Control logic supports three operational modes: CS-only (SPI), CS-as-FS (DSP), or dual CS/FS (TLV2541 only). The TLV2545IDGKR uses CS-only control with 16-cycle SCLK frame, MSB-first output on SDO, and automatic 3-state release after the 17th SCLK rising edge. Power management includes immediate autopower-down (5 µA at 5 V) and deep power-down (1 µA after 2 ms idle).

Key Specifications

Pinout & Package

TLV2545IDGKR is housed in an 8-pin MSOP (DGK) package, 3.0 mm × 3.0 mm × 1.0 mm body height, with exposed thermal pad (not electrically connected). Pin 1 is marked by a dot; pin numbering follows standard MSOP convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MCP3201-I/P, TLV2545IDGKR uniquely combines pseudo-differential input, 2 µA autopower-down, and MSOP-8 packaging - making it optimal for compact, battery-aware industrial sensors where ground noise and board area are critical constraints.

Availability

TLV2545IDGKR is available at Aetrix Electronics and suitable for industrial process monitoring, portable data acquisition, motor control feedback, and medical sensor interface applications requiring stable component supply, extended temperature operation (−40°C to +85°C), and RoHS-compliant packaging.

Supply support for TLV2545IDGKR 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 design.

The TLV2545IDGKR belongs to TI's TLV254x family of low-power 12-bit SAR ADCs, engineered specifically for battery-operated instrumentation and industrial sensing where accuracy, noise immunity, and energy efficiency are co-prioritized.

FAQ

What is the maximum sampling rate supported by TLV2545IDGKR?

The TLV2545IDGKR achieves up to 200 kSPS at VDD = 4.5–5.5 V and 140 kSPS at VDD = 2.7 V, as specified in Table 1 of the SLAS245E datasheet. This throughput assumes proper SCLK timing (up to 20 MHz), adequate setup/hold times, and use of the internal conversion clock. The 3.5 µs fixed conversion time enables predictable timing in deterministic real-time systems.

Does TLV2545IDGKR support true differential input mode?

No, TLV2545IDGKR operates in pseudo-differential mode only: AIN(+) (pin 4) is the signal input, and AIN(−) (pin 5) serves as a dedicated common-mode reference with ±0.2 V ripple tolerance. It does not perform true differential subtraction like a fully differential ADC. This architecture is optimized for rejecting ground noise in single-ended sensor configurations, not for measuring voltage differences between two floating points.

How does autopower-down work in TLV2545IDGKR?

In TLV2545IDGKR, autopower-down activates automatically at the end of each conversion cycle. If no new CS falling edge occurs within 0.5 µs, supply current drops to 2 µA (2.7 V) or 5 µA (5 V). For deep power-down (1 µA), the device requires ≥2 ms of CS high time. Wake-up is immediate upon the next CS falling edge - no initialization delay - making it ideal for event-triggered sampling in IoT endpoints.

Can TLV2545IDGKR interface directly with an Arduino SPI bus?

Yes, TLV2545IDGKR is SPI-compatible and works with Arduino platforms using standard hardware SPI. Configure the Arduino SPI peripheral for CPOL = 0 (clock idle low) and CPHA = 1 (data sampled on falling edge). Ensure CS is controlled by a GPIO pin, and insert at least one SCLK pulse whenever CS is high to satisfy timing requirements per the datasheet Section "Control and Timing".

What is the purpose of the AIN(−) pin on TLV2545IDGKR?

The AIN(−) pin (pin 5) on TLV2545IDGKR provides a dedicated reference point for the pseudo-differential input stage. It accepts small common-mode variations (±0.2 V) and enables rejection of ground-borne noise when tied to local sensor ground or filtered reference. Unlike a true differential input, AIN(−) does not invert the signal - it sets the baseline against which AIN(+) is measured, improving SNR in electrically noisy environments.