Texas Instruments ADS7042IDCUR

Overview

ADS7042IDCUR from Texas Instruments is an ultra-low-power, 12-bit, 1-MSPS successive-approximation register (SAR) analog-to-digital converter in an X2QFN-8 package (1.5 mm × 1.5 mm). It features unipolar input range (0 V to AVDD), ±1-LSB max INL/DNL, 70-dB SNR at 3-V AVDD, and integrated offset calibration - enabling precision sensing in space-constrained, battery-powered systems such as wearable fitness monitors and glucose meters.

For engineers reviewing the ADS7042IDCUR datasheet, ADS7042IDCUR pinout, ADS7042IDCUR application, or ADS7042IDCUR equivalent, key selection criteria include its nanowatt power profile (234 µW at 1 MSPS/1.8 V), zero-latency conversion, SPI-compatible 16-MHz serial interface, JESD8-7A digital I/O compliance, and operation across –40°C to 125°C.

Technical Context

The ADS7042IDCUR implements a capacitor-based SAR architecture with an inherent sample-and-hold circuit, sampling on the CS falling edge and using SCLK for conversion timing and serial data output. Its analog input accepts single-ended signals referenced to AVDD, with AINP supporting 0 V to AVDD and AINM tolerating –100 mV to +100 mV for ground-offset rejection.

Digital operation is decoupled from analog supply: DVDD (1.65 V to 3.6 V) powers the SPI interface independently of AVDD, enabling direct interfacing with diverse host controllers. Offset calibration is user-initiated and improves EO to ±0.5 LSB (calibrated, AVDD = 3 V), while AVDD serves dual role as analog supply and reference voltage.

Key Specifications

Pinout & Package

X2QFN-8 package (1.5 mm × 1.5 mm × 0.35 mm height) with wettable flank leads for automated optical inspection (AOI) and reliable solder-joint formation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7042IDCUR, ADS7041IDCUR trades 2 bits of resolution for lower power and cost, while ADS7043IRUGR retains 12-bit accuracy but shifts to pseudo-differential topology - making ADS7042IDCUR the optimal choice for single-ended, ultra-low-power, high-linearity applications requiring minimal board area.

Availability

ADS7042IDCUR is available at Aetrix Electronics and suitable for wearable fitness monitors, portable medical equipment, ultrasonic flow meters, and motor control feedback systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS7042IDCUR 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 low-power design.

The ADS7042IDCUR belongs to TI's ultra-low-power SAR ADC product line, engineered specifically for space- and energy-constrained applications including wearables, portable diagnostics, and battery-operated industrial sensors.

FAQ

What is the maximum sampling rate supported by the ADS7042IDCUR?

The ADS7042IDCUR supports a maximum throughput rate of 1 MSPS, achieved with a 16-MHz SCLK and proper timing adherence (tSU_CSCK ≥ 15 ns, tCYCLE = 1 µs). This rate is guaranteed across the full operating temperature range (–40°C to 125°C) and AVDD supply range (1.65 V to 3.6 V), with zero data latency ensuring immediate availability of converted results.

Does the ADS7042IDCUR require an external voltage reference?

No, the ADS7042IDCUR does not require an external voltage reference. It uses AVDD as its internal reference voltage, meaning the full-scale input range is exactly 0 V to AVDD. This eliminates external reference components and associated layout complexity, though AVDD must be well-decoupled (≥200 nF ceramic capacitor) to maintain SNR and INL performance.

What package type is used for the ADS7042IDCUR, and what are its dimensions?

The ADS7042IDCUR is packaged in an X2QFN-8 (RUG) package with nominal dimensions of 1.5 mm × 1.5 mm × 0.35 mm height. This ultra-compact, leaded package features wettable flanks for reliable solder-joint inspection and is the industry's smallest 12-bit SAR ADC footprint, occupying less area than a standard 0805 (2012 metric) passive component.

How does the ADS7042IDCUR handle ground potential differences between sensor and ADC?

The ADS7042IDCUR accommodates ground offsets via its AINM pin, which accepts voltages from –100 mV to +100 mV relative to GND. This allows direct connection of remote sensors or signal-conditioning stages whose local ground differs from the ADC's GND, rejecting common-mode errors without requiring isolated amplifiers or level shifters - a key enabler for robust wearable and portable designs.

Is the ADS7042IDCUR compatible with 1.8-V digital logic interfaces?

Yes, the ADS7042IDCUR's digital I/O is JESD8-7A compliant for DVDD = 1.65 V to 1.95 V, making it fully compatible with 1.8-V microcontrollers and FPGAs. VIH is defined as ≥0.65 × DVDD and VIL ≤ 0.35 × DVDD, ensuring robust noise margins. The SDO output drives to 0.8 × DVDD (min) at 500 µA, supporting direct connection to 1.8-V logic without level translation.