Texas Instruments TLV2542IDGK

Overview

TLV2542IDGK from Texas Instruments is a 12-bit, dual-channel SAR analog-to-digital converter with autosweep capability, operating from 2.7 V to 5.5 V supply. It delivers up to 200 kSPS throughput, ±1 LSB INL/DNL accuracy, and 72 dB SINAD at 20 kHz input, used in precision sensor signal conditioning for industrial data acquisition systems.

For engineers reviewing the TLV2542IDGK datasheet, TLV2542IDGK pinout, TLV2542IDGK application, or TLV2542IDGK equivalent, key selection criteria include its MSOP-8 package, SPI/DSP-compatible serial interface, rail-to-rail 500 kHz analog input bandwidth, autopower-down current of 2 μA (2.7 V), and dual-channel autosweep timing behavior.

Technical Context

The TLV2542IDGK implements a successive approximation register (SAR) architecture with charge redistribution DAC and an internal 4 MHz oscillator for fixed 3.5 μs conversion time. Its dual-input multiplexer toggles between AIN0 and AIN1 on each CS falling edge, with reset capability via short CS pulses (4–7 SCLKs).

It supports three control modes: CS-only (SPI), CS-as-FS (DSP), and dual CS/FS (TLV2541 only); TLV2542IDGK uses CS-only or CS-as-FS. Output is unipolar straight binary (MSB-first), with SDO entering high-impedance state after 17th SCLK rising edge.

Key Specifications

Pinout & Package

TLV2542IDGK is housed in an 8-pin MSOP (DGK) package, 3.0 mm × 3.0 mm × 1.0 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected). Pinout matches TLV2542 functional diagram per SLAS245E Rev. April 2010.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel SAR ADC applications.

Compared with ADS7822U and MCP3202-I/P, TLV2542IDGK uniquely combines 12-bit accuracy, hardware autosweep, 200 kSPS speed, and 2 μA autopower-down in a space-constrained MSOP-8, making it optimal for next-generation compact, battery-efficient industrial and medical sensors.

Availability

TLV2542IDGK is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, motor control feedback systems, and medical instrumentation requiring stable component supply across extended temperature ranges (−40°C to 85°C).

Supply support for TLV2542IDGK 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 TLV2542IDGK belongs to TI's TLV254x family of low-power, 12-bit SAR ADCs engineered for battery-operated and space-constrained industrial and medical systems requiring high accuracy without external clocking or complex interface logic.

FAQ

What is the maximum sampling rate of the TLV2542IDGK?

The TLV2542IDGK 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 SLAS245E. This rate assumes CS-only control mode with 15 MHz SCLK (4.5 V) or 10 MHz SCLK (2.7 V), and accounts for 16 SCLK cycles plus 3.5 μs internal conversion time. The TLV2542IDGK does not support the CS+FS mode that enables 200 kSPS at 2.7 V.

Does the TLV2542IDGK support pseudo-differential input mode?

No, the TLV2542IDGK supports only single-ended dual-channel input (AIN0 and AIN1). Pseudo-differential operation is exclusive to the TLV2545 variant, which uses pins 4 (AIN+) and 5 (AIN−). The TLV2542IDGK pinout assigns AIN1 to pin 5 as a second single-ended input, not an inverted input; applying differential signals to AIN0/AIN1 will not yield common-mode rejection.

How does the TLV2542IDGK handle channel selection and autosweep timing?

The TLV2542IDGK toggles between AIN0 and AIN1 on each CS falling edge. A short CS pulse (4–7 SCLKs) resets the MUX to AIN0; a long CS pulse (>7 SCLKs) completes a full conversion and advances to the next channel. The SDO output during a given CS cycle contains the result from the *previous* channel's sample, requiring one-cycle latency management in firmware.

What is the power consumption of TLV2542IDGK in autopower-down mode?

The TLV2542IDGK draws 2 μA at 2.7 V and 5 μA at 5 V when entering autopower-down immediately after conversion completion (≥0.5 μs inactive time). For deep power-down (1 μA), ≥2 ms inactive time is required. These values are measured with all digital inputs held at valid logic levels and SCLK = 0, per Section 7.5 of SLAS245E.

Can TLV2542IDGK operate with an internal reference?

No, the TLV2542IDGK requires an external reference applied to the VREF pin (pin 2). It has no internal reference circuitry. The reference voltage must be between 2 V and VDD, stable, low-noise, and properly decoupled. Using VDD as VREF is permissible but sacrifices accuracy due to supply ripple and tolerance; dedicated 2.5 V or 4.096 V references are recommended for metrology-grade applications.