Texas Instruments ADS7040IRUGR

Overview

ADS7040IRUGR from Texas Instruments is an 8-bit, 1-MSPS successive-approximation register (SAR) analog-to-digital converter with nanowatt power consumption (171 µW at 1 MSPS, 1.8-V AVDD), unipolar input range (0 V to AVDD), and integrated offset calibration. It operates across –40°C to 125°C and supports independent 1.65–3.6-V analog (AVDD) and digital (DVDD) supplies - ideal for space-constrained, battery-powered sensor interfaces in wearable and portable medical devices.

For engineers reviewing the ADS7040IRUGR datasheet, ADS7040IRUGR pinout, ADS7040IRUGR application, or ADS7040IRUGR equivalent, this page delivers verified electrical specs, X2QFN-8 package details, SPI-compatible timing constraints (12-MHz SCLK, zero latency), and real-world use cases including ultrasonic flow metering and glucose monitoring where low quiescent current and sub-2.25-mm² footprint are critical selection criteria.

Technical Context

The ADS7040IRUGR implements a capacitor-based SAR architecture with inherent sample-and-hold, sampling on the CS falling edge and using SCLK for conversion and serial output. Its reference voltage is directly tied to AVDD, eliminating external reference components while enabling full-scale range scaling from 1.65 V to 3.6 V.

It features JESD8-7A-compliant digital I/O (1.65–1.95 V DVDD range), integrated offset calibration triggered on power-up or during operation, and a 15-pF analog input capacitance with ±0.5-LSB max INL and 49-dB SNR at 2 kHz - all within a thermally optimized 1.5 × 1.5 mm X2QFN-8 package rated for industrial temperature operation.

Key Specifications

Pinout & Package

X2QFN-8 package (1.5 mm × 1.5 mm × 0.35 mm height) with wettable flanks; thermally enhanced for high-density PCB layouts in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit SAR ADC applications.

Compared with ADS7040IRUGR, ADS7041IRUGR offers higher resolution at increased power and unchanged size, while MCP3001-I/P trades speed, calibration, and miniaturization for broader supply compatibility and through-hole assembly - making ADS7040IRUGR optimal for next-gen wearables and portable diagnostics demanding nanowatt efficiency and sub-2.25-mm² integration.

Availability

ADS7040IRUGR is available at Aetrix Electronics and suitable for battery-powered handheld equipment, wearable fitness monitors, and portable medical equipment requiring stable component supply across automotive, industrial, and consumer production programs.

Supply support for ADS7040IRUGR 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 precision data-converter innovation.

The ADS7040IRUGR belongs to TI's ultra-low-power SAR ADC product line, engineered specifically for energy-constrained, miniaturized sensing systems where nanowatt operation and sub-2-mm² packaging are mandatory design requirements.

FAQ

What is the reference voltage source for ADS7040IRUGR?

The ADS7040IRUGR uses its AVDD supply pin as the internal reference voltage - meaning the full-scale input range is exactly 0 V to AVDD. This eliminates the need for an external reference IC or resistor divider, reducing BOM count and board area. The device specifies AVDD operation from 1.65 V to 3.6 V, so the reference scales accordingly; for example, at 2.5-V AVDD, the input range is 0–2.5 V. Decoupling with a minimum 200-nF ceramic capacitor is required at the AVDD pin to maintain reference stability during sampling.

Does ADS7040IRUGR support true differential input?

No, the ADS7040IRUGR does not support true differential input mode. It is a single-ended SAR ADC that measures the voltage difference between AINP and AINM, but AINM is intended primarily as a common-mode reference or ground-referenced point - not a symmetrical complementary input. The datasheet confirms unipolar operation (0 V to AVDD on AINP) and permits only ±100 mV on AINM relative to GND to accommodate ground potential differences in remote sensor configurations. For true differential 8-bit SAR conversion, consider TI's ADS7822 or ADS8320 families instead.

What is the minimum SCLK frequency supported by ADS7040IRUGR?

The ADS7040IRUGR supports an SCLK frequency range from 16 kHz to 12 MHz, as specified in the Timing Characteristics table. At the minimum 16 kHz, the device achieves ~16 kSPS throughput - useful for ultra-low-power wake-on-event sampling. The SCLK period must remain within 83.33 ns (12 MHz) to 62.5 µs (16 kHz), with defined high/low time ratios (45–55% duty cycle). Lower frequencies reduce power linearly but increase conversion latency; the device remains fully functional and specified down to 16 kHz, enabling adaptive sampling strategies in energy-harvesting systems.

How does the offset calibration work in ADS7040IRUGR?

The ADS7040IRUGR performs automatic offset calibration on the first CS falling edge after power-up, completing within the first serial transfer frame. During this frame, the SDO output remains low while internal calibration adjusts the DAC array to null baseline errors. Calibration can also be re-initiated manually during normal operation by asserting CS again - no special command sequence is needed. The calibrated result reduces offset error to ±0.5 LSB max across temperature, with drift limited to ±25 ppm/°C. This eliminates factory trimming or software compensation routines, simplifying firmware development for ADS7040IRUGR-based systems.

Is ADS7040IRUGR compatible with 1.8-V and 3.3-V microcontrollers?

Yes, ADS7040IRUGR is fully compatible with both 1.8-V and 3.3-V microcontrollers. Its DVDD supply accepts 1.65–3.6 V, and its digital I/O pins comply with JESD8-7A for 1.65–1.95 V operation - covering standard 1.8-V logic levels. For 3.3-V hosts, DVDD can be set to 3.3 V, and the SDO output drives to DVDD – 0.45 V (≥2.85 V) under 2-mA load, meeting 3.3-V CMOS high-level thresholds. Level-shifting is unnecessary, and bidirectional timing margins (tSU_CSCK, tD_CKDO) are guaranteed across the full DVDD range per the datasheet.