Texas Instruments TLV2545CDGK

Overview

TLV2545CDGK from Texas Instruments is a 12-bit, pseudo-differential input SAR analog-to-digital converter with built-in conversion clock, 140–200 kSPS throughput, ±1 LSB INL/DNL, and rail-to-rail 500 kHz analog input bandwidth. It operates from a single 2.7 V to 5.5 V supply and delivers 72 dB SINAD at 20 kHz, targeting precision sensor signal acquisition in battery-powered industrial monitoring systems.

For engineers reviewing the TLV2545CDGK datasheet, TLV2545CDGK pinout, TLV2545CDGK application, or TLV2545CDGK equivalent, key selection considerations include its MSOP-8 package, autopower-down current of 2 µA (2.7 V), SPI/DSP-compatible serial interface with CS/SDO/SCLK pins, and pseudo-differential input architecture optimized for ground noise rejection in noisy analog environments.

Technical Context

The TLV2545CDGK implements a charge redistribution SAR architecture with an internal 4 MHz oscillator driving a fixed 3.5 µs conversion time. Its pseudo-differential input pair (AIN(+) on Pin 4, AIN(−) on Pin 5) supports up to ±0.2 V common-mode ripple, enabling robust operation in electrically noisy layouts without external differential amplifiers.

Control logic accepts either chip-select (CS)-only mode for microcontroller SPI interfaces or dual CS/FS signaling for TMS320 DSP integration. The device enters autopower-down immediately after conversion completion, achieving 2 µA (2.7 V) or 5 µA (5 V) quiescent current within 0.5 µs, with deep power-down (1 µA) activated after ≥2 ms inactive time.

Key Specifications

Pinout & Package

TLV2545CDGK is housed in an 8-pin MSOP (DGK) package, 3.0 mm × 3.0 mm × 1.0 mm body, exposed pad optional, RoHS-compliant, rated for 0°C to 70°C ambient operation.

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, TLV2545CDGK uniquely combines pseudo-differential input, integrated clock, and sub-µA autopower-down in an MSOP-8 package - making it the only option that satisfies simultaneous requirements for noise immunity, minimal external components, and battery longevity in compact embedded systems.

Availability

TLV2545CDGK is available at Aetrix Electronics and suitable for industrial sensor interface, portable data logging, medical vital sign monitoring, and motor control feedback applications requiring stable component supply across extended production lifecycles.

Supply support for TLV2545CDGK 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 signal chain solutions.

The TLV254x family was designed specifically for battery-operated and space-constrained industrial and medical instrumentation requiring high-resolution, low-noise, and ultra-low-power analog-to-digital conversion without external timing or reference components.

FAQ

What is the maximum sampling rate supported by the TLV2545CDGK?

The TLV2545CDGK achieves up to 200 kSPS under optimal conditions (VDD = 4.5–5.5 V, SCLK ≤ 20 MHz). At 2.7 V supply, maximum throughput drops to 140 kSPS due to internal clock limitations. The 3.5 µs conversion time remains fixed regardless of SCLK frequency, but total cycle time depends on SCLK period and setup/hold timing margins.

Does the TLV2545CDGK require an external reference voltage?

Yes, the TLV2545CDGK requires an external reference applied to the VREF pin to define its full-scale input range. VREF must be between 2 V and VDD, and the analog input (AIN(+)) must remain within 0 V to VREF. No internal reference is provided - this allows system-level optimization of accuracy, temperature drift, and power trade-offs using discrete or integrated reference ICs.

How does the pseudo-differential input of the TLV2545CDGK improve noise immunity?

The TLV2545CDGK's pseudo-differential input uses AIN(+) and AIN(−) pins to measure the voltage difference while rejecting common-mode noise up to ±0.2 V. This architecture eliminates the need for external differential amplifiers and allows direct connection to noisy sensor grounds, significantly improving measurement stability in industrial environments with shared return paths and switching transients.

What is the power consumption of the TLV2545CDGK in autopower-down mode?

In autopower-down mode, the TLV2545CDGK draws 2 µA at 2.7 V and 5 µA at 5 V, achieved within 0.5 µs after conversion completion. For deeper savings, a 2 ms inactive period enables "deep autopower-down" at 1 µA - ideal for intermittent sampling in battery-powered systems where conversion intervals exceed several milliseconds.

Which microcontrollers or processors are compatible with the TLV2545CDGK serial interface?

The TLV2545CDGK supports standard SPI mode 0 (CPOL = 0, CPHA = 1) and is directly compatible with MSP430, STM32, PIC, and TMS320 DSP families. Its CS/SDO/SCLK interface requires no protocol translation - the host simply asserts CS low, clocks 16 edges on SCLK, and reads the MSB-first 12-bit result from SDO, with four trailing don't-care bits.