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Texas Instruments ADS7042IRUGR
- Part No.:
- ADS7042IRUGR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-XFQFN
- Datasheet:
-
ADS7042IRUGR.pdf
- Description:
- IC ADC 12BIT SAR 8X2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,196
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Product details
Overview
ADS7042IRUGR 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 uses AVDD as both analog supply and internal reference, supports unipolar input range (0 V to AVDD), delivers ±1-LSB max INL/DNL, and achieves 70-dB SNR at 3-V AVDD - enabling high-accuracy sensing in space-constrained, battery-powered systems like wearable fitness monitors and glucose meters.
For engineers reviewing the ADS7042IRUGR datasheet, ADS7042IRUGR pinout, ADS7042IRUGR application, or ADS7042IRUGR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options for low-power 12-bit SAR ADC selection, and supply support details tailored for OEM and embedded design programs.
Technical Context
The ADS7042IRUGR implements a capacitor-based SAR architecture with integrated sample-and-hold, sampling on the CS falling edge and using SCLK for conversion timing and serial data output. Its analog input path accepts single-ended signals across AINP (0 V to AVDD) and AINM (–0.1 V to +0.1 V), with internal offset calibration active at power-up or on-demand.
Digital interface compliance with JESD8-7A (DVDD = 1.65 V to 1.95 V) and independent DVDD/AVDD supplies (both 1.65 V to 3.6 V) enable direct interfacing with diverse host controllers. Zero data latency and 1-MSPS throughput are achieved with ≤16-MHz SCLK, while acquisition time is fixed at 200 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization in precision sensor interfaces. |
| Throughput | 1 MSPS - supports real-time sampling of fast transients in motor control or ultrasonic flow metering without pipeline delay. |
| Power @ 1 MSPS | 234 µW at 1.8-V AVDD - enables multi-year operation on coin-cell batteries in wearables and portable medical devices. |
| INL / DNL | ±1 LSB max - ensures monotonicity and <0.025% full-scale linearity error for accurate DC measurements in level sensors. |
| SNR / THD | 70 dB / –80 dB at 3-V AVDD - provides clean 11.3-bit effective resolution for low-noise applications like ECG front ends. |
| Analog Input Range | 0 V to AVDD (unipolar) - simplifies signal conditioning by eliminating external level-shifting when powered from same rail as sensor. |
| Supply Range | AVDD & DVDD: 1.65 V to 3.6 V - allows flexible dual-rail or single-rail digital interfacing with 1.8-V or 3.3-V microcontrollers. |
Pinout & Package
X2QFN-8 package (RUG), 1.5 mm × 1.5 mm × 0.35 mm height, wettable flank terminals, exposed thermal pad (GND-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP | Analog input, positive | Main signal input node; accepts 0 V to AVDD; sampled on CS falling edge; requires low-source-impedance drive for <200-ns acquisition. |
| AINM | Analog input, negative | Reference input for differential rejection; accepts –0.1 V to +0.1 V; used to compensate ground offsets in remote sensor layouts. |
| AVDD | Analog supply & reference | Provides both power and voltage reference; must be decoupled with ≥200 nF ceramic capacitor; defines full-scale range (FSR = AVDD). |
| DVDD | Digital I/O supply | Independent of AVDD; powers SPI interface; supports JESD8-7A logic levels (1.65–1.95 V) and wider 1.65–3.6 V operation. |
| GND | Common ground | Single ground reference for analog, digital, and thermal pad; critical for noise immunity; requires low-inductance PCB connection. |
| CS | Chip select | Active-low frame sync; falling edge triggers sampling; rising edge places SDO in high-Z state after conversion completes. |
| SCLK | Serial clock | Up to 16 MHz; controls conversion timing and serial bit transfer; duty cycle 45–55%; no internal clock generation required. |
| SDO | Serial data out | CMOS-compatible output; MSB-first, straight binary; data valid 30 ns after SCLK falling edge (AVDD ≥1.8 V); tri-states on CS rise. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power at 1 MSPS | 234 µW @ 1.8 V - reduces thermal load and extends battery life in always-on portable medical equipment. |
| Smallest SAR ADC footprint | 2.25 mm² (1.5 × 1.5 mm) - fits within 0805 SMD area, enabling miniaturized PCBs for hearing aids and smart patches. |
| Integrated offset calibration | On-demand or power-up calibration reduces system-level trimming effort and improves long-term DC accuracy in level sensors. |
| Zero-latency conversion | No pipeline delay between sampling and data availability - essential for closed-loop motor control requiring deterministic timing. |
| Wide AVDD/DVDD independence | Separate 1.65–3.6 V rails allow direct interface to 1.8-V FPGAs or 3.3-V MCUs without level shifters or LDOs. |
Applications
| Wearable Fitness Monitoring | Portable Glucose Meters |
|---|---|
|
Use Scenario: Continuous analog signal acquisition from bioimpedance or optical sensors in wrist-worn devices. IC Role / Device Role / Timing Role: Primary 12-bit digitizer capturing low-amplitude physiological waveforms at up to 1 MSPS with minimal power draw. Use Value: 234 µW operation at 1.8 V enables >3-year coin-cell battery life; 1.5-mm² size permits integration into sub-20-mm form factors. |
Use Scenario: High-accuracy blood glucose concentration measurement via amperometric electrochemical sensor output. IC Role / Device Role / Timing Role: Precision unipolar ADC converting nanoamp-level sensor current (via transimpedance amplifier) into digital values. Use Value: ±1-LSB INL ensures <0.025% full-scale error over temperature; integrated offset calibration maintains accuracy without factory recalibration. |
| Ultrasonic Flow Meters | Motor Control Current Sensing |
|
Use Scenario: Digitizing echo return signals from piezoelectric transducers in battery-powered handheld flow test tools. IC Role / Device Role / Timing Role: High-speed SAR ADC acquiring transient bursts with zero latency to preserve time-of-flight resolution. Use Value: 1-MSPS throughput captures >500-kHz envelope signals; 70-dB SNR enables reliable detection of weak echoes in noisy industrial environments. |
Use Scenario: Sampling shunt voltage in BLDC motor drives for real-time phase current feedback in compact inverters. IC Role / Device Role / Timing Role: Single-ended ADC interfaced directly to MCU SPI port, synchronized to PWM cycles for precise current reconstruction. Use Value: Independent DVDD/AVDD rails allow 3.3-V MCU communication while running AVDD at 2.5 V for optimal SNR; 200-ns acquisition supports high-frequency switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7043IRUGR | Pseudo-differential input (AINP–AINM), same 12-bit/1-MSPS spec, identical package and power profile. | Better common-mode noise rejection in noisy motor or industrial environments where AINM carries non-zero bias. | Select ADS7043IRUGR when sensor output is referenced to a non-ground potential or when higher CMRR is required. |
| ADS7044IRUGR | Fully differential input, 12-bit/1-MSPS, same footprint, but requires matched external resistor network for gain/offset setting. | Superior dynamic range for bipolar signals or applications needing >80-dB SFDR, such as precision instrumentation amplifiers. | Choose ADS7044IRUGR only if fully differential topology is mandated by signal chain architecture and layout complexity is acceptable. |
Compared with ADS7042IRUGR, ADS7043IRUGR offers enhanced noise immunity for floating sensors without increasing board area, while ADS7044IRUGR trades ease of use for maximum AC performance - making ADS7042IRUGR the optimal choice for cost-sensitive, space-constrained unipolar sensing.
Availability
ADS7042IRUGR is available at Aetrix Electronics and suitable for wearable fitness monitoring, portable glucose meters, and ultrasonic flow metering requiring stable component supply across production lifecycles.
Supply support for ADS7042IRUGR 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 focused on analog and embedded processing technologies, with decades of expertise in precision data converters and low-power design.
The ADS7042IRUGR belongs to TI's ultra-low-power SAR ADC product line, engineered specifically for battery-operated, miniaturized sensing applications demanding high resolution without compromising size or energy efficiency.
FAQ
What is the minimum AVDD voltage required for reliable operation of the ADS7042IRUGR?
The ADS7042IRUGR specifies a recommended operating range of 1.65 V to 3.6 V for AVDD. Operation below 1.65 V is not guaranteed - at 1.65 V, it maintains full 12-bit performance including ±1-LSB INL/DNL and 1-MSPS throughput. The device's absolute maximum rating allows down to –0.3 V, but functional operation begins strictly at 1.65 V per TI SBAS608C datasheet Section 8.3.
Does the ADS7042IRUGR require an external reference voltage?
No, the ADS7042IRUGR does not require an external reference. It uses AVDD as its internal reference voltage, so the full-scale input range is exactly 0 V to AVDD. This eliminates external reference components and simplifies layout - however, AVDD must be well-decoupled (≥200 nF ceramic capacitor) to maintain DC accuracy and SNR performance.
Can the ADS7042IRUGR interface directly with a 1.8-V microcontroller SPI port?
Yes, the ADS7042IRUGR supports DVDD from 1.65 V to 3.6 V and complies with JESD8-7A for 1.65–1.95 V logic levels. When DVDD = 1.8 V, VIH = 1.17 V min and VIL = 0.63 V max - matching standard 1.8-V CMOS thresholds. No level shifter is needed, and SDO output swing is rail-to-rail relative to DVDD.
How does the ADS7042IRUGR achieve ultra-low power consumption at 1 MSPS?
The ADS7042IRUGR achieves 234 µW at 1.8-V AVDD and 1 MSPS through architectural optimizations: a highly efficient switched-capacitor SAR core, minimized analog circuitry, and aggressive power gating during idle cycles. Its static AVDD current drops to <1 µW at 1 kSPS, and dynamic current scales linearly with throughput - enabling adaptive power management in duty-cycled systems.
Is the ADS7042IRUGR pin-compatible with other devices in the ADS704x family?
Yes, all ADS704x devices (ADS7040/41/42/43/44) share identical X2QFN-8 (RUG) and VSSOP-8 (DCU) packages and pinouts. The ADS7042IRUGR, ADS7043IRUGR, and ADS7044IRUGR are mechanically interchangeable - though functional differences (input type, calibration behavior) require firmware or external circuit updates when substituting.
ADS7042IRUGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-XFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Supply
- Voltage - Supply, Analog:
- 1.65V ~ 3.6V
- Voltage - Supply, Digital:
- 1.65V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-X2QFN (1.5x1.5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7042IRUGR FAQ
1.How can I place an order for ADS7042IRUGR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7042IRUGR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS7042IRUGR reliable?
The price and inventory of ADS7042IRUGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7042IRUGR is usually 5 days.
3.What payment methods are accepted for ADS7042IRUGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7042IRUGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7042IRUGR?
ADS7042IRUGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7042IRUGR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS7042IRUGR?
For technical support, including ADS7042IRUGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7042IRUGR requirements.
6.How does Aetrix verify that ADS7042IRUGR is sourced from the original manufacturer or authorized distributors?
All ADS7042IRUGR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS7042IRUGR meets industry standards.
7.What is the process for return or replacement of ADS7042IRUGR?
All ADS7042IRUGR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7042IRUGR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS7042IRUGR part is unused and in its original packaging.
Return procedure for ADS7042IRUGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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