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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Texas Instruments REF7040QDGKR

Name: REF7040QDGKR
Brand: Texas Instruments
SKU: REF7040QDGKR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: REF7040QDGKR

Manufacturer:: Texas Instruments

Category:: Voltage Reference

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: REF7040QDGKR.pdf

Description:: IC VREF SERIES 8TSSOP

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Product details

Overview

REF7040QDGKR from Texas Instruments is a precision 4.096 V series voltage reference IC designed for high-resolution data acquisition signal chains. It delivers ±0.025% initial accuracy, 2 ppm/°C max temperature drift (−40°C to +125°C), and ultra-low 0.23 ppmp-p 0.1–10 Hz noise-enabling optimal performance with ADCs like ADS8900B and DAC11001A in test equipment and medical imaging.

For engineers reviewing the REF7040QDGKR datasheet, REF7040QDGKR pinout, REF7040QDGKR application, or REF7040QDGKR equivalent, key selection considerations include its VSSOP-8 hermetic-grade stability, 400 mV dropout at ±10 mA load, 107 dB PSRR at 1 kHz, and compatibility with 1–100 μF low-ESR output capacitors in industrial and safety-critical analog front ends.

Technical Context

The REF7040QDGKR implements a bandgap-based series reference architecture with dual-output force-sense topology (OUTF/OUTS) to maintain regulation under varying load and PCB trace impedance. Its internal enable circuitry supports shutdown mode with ≤12 μA quiescent current across −40°C to +125°C.

It features integrated thermal hysteresis compensation and long-term stability optimization via hermetic ceramic packaging-though this specific variant uses the VSSOP-8 (DGK) package, which trades some hysteresis performance (410 ppm cycle-1) for compact size versus LCCC variants.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096 V nominal; precisely matches 12-bit full-scale step (4096 × 1 mV) for seamless interface with SAR and delta-sigma ADCs.
Initial Accuracy	±0.025% at 25°C; ensures <±1 LSB error in 16-bit systems without calibration.
Temp Drift	2 ppm/°C max over −40°C to +125°C; contributes ≤±0.001% error across full industrial range.
Low-Freq Noise	0.23 ppmp-p (0.1–10 Hz); enables sub-μV RMS noise floor in precision weigh scales and ultrasound beamforming.
Dropout Voltage	400 mV at ±10 mA load; allows operation from 4.5 V supply with 4.096 V output-critical for low-voltage industrial PLC I/O.
PSRR	107 dB at 1 kHz; rejects switching regulator ripple and digital noise coupling into sensitive analog signal paths.
Quiescent Current	6.5 mA max active, 12 μA max shutdown; supports power-gated precision subsystems in battery-backed instrumentation.

Pinout & Package

VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, exposed pad optional, RoHS-compliant, moisture sensitivity level 2a.

Pin/Terminal	Circuit Role	Design Meaning
1 - EN	Enable control input	Active-high logic; >1.6 V enables output; floating defaults to enabled via internal pull-up-eliminates need for external bias in always-on systems.
2 - VIN	Input supply connection	Accepts 4.496 V to 18 V; requires ≥0.1 μF decoupling capacitor to ground for PSRR and transient immunity.
3,4,5,8 - GND	Ground terminals	Four dedicated ground pins minimize ground bounce and improve PSRR; connect all to same low-impedance analog ground plane.
6 - OUTS	Sense input	High-impedance feedback node; connects directly to load-side of sense resistor or ADC reference input to cancel trace IR drop.
7 - OUTF	Force output	Delivers regulated 4.096 V; must be bypassed with 1–100 μF low-ESR capacitor (1–400 mΩ) for stability and noise reduction.

Key Features

Feature	Design Value
Ultra-low 1/f noise	0.23 ppmp-p (0.1–10 Hz) enables <1 μVpp noise floor in 100-ms integration windows for semiconductor parametric testers.
Hermetic-grade stability	35 ppm long-term drift (1000 hr @ 35°C) supports calibration intervals >1 year in field transmitters without recalibration.
Wide-capacitor stability	Stable with 1–100 μF output capacitance-allows use of cost-effective bulk tantalum or polymer caps instead of expensive low-ESR ceramics.
High PSRR	107 dB at 1 kHz rejects >99.99% of 1 MHz switcher ripple harmonics-critical for mixed-signal SoCs sharing noisy DC/DC supplies.
Flexible enable control	EN pin supports both hardware shutdown (≤0.5 V) and software-controlled power cycling-reducing system standby power by >99.8%.

Applications

Semiconductor Test Equipment	Precision Data Acquisition Systems
Use Scenario: Automated wafer-level parametric testing requiring sub-LSB accuracy across temperature. IC Role / Device Role / Timing Role: Primary voltage reference for 24-bit delta-sigma ADCs sampling device leakage currents and threshold voltages. Use Value: 2 ppm/°C drift and 0.23 ppmp-p noise ensure <±0.5 LSB total error over −40°C to +125°C, eliminating per-temperature binning.	Use Scenario: Portable environmental monitoring logger capturing pH, dissolved oxygen, and conductivity with 18-bit resolution. IC Role / Device Role / Timing Role: Stable excitation source and ADC reference for ratiometric sensor measurements using low-power microcontrollers. Use Value: 400 mV dropout enables single-cell Li-ion (3.0–4.2 V) operation while maintaining 4.096 V output-extending battery life by 30% vs. older references.
Ultrasound Scanner	PLC Analog I/O Modules
Use Scenario: Beamforming front-end with 128-channel ADCs digitizing echo signals at 40 MSPS. IC Role / Device Role / Timing Role: Low-noise reference for time-interleaved ADC arrays where correlated noise degrades SNR. Use Value: 0.23 ppmp-p 1/f noise prevents 0.5 dB SNR degradation in 1–10 MHz bandwidth-meeting FDA Class II ultrasound image fidelity requirements.	Use Scenario: DIN-rail mounted industrial controller converting 4–20 mA field signals to digital with ±0.01% accuracy. IC Role / Device Role / Timing Role: Precision reference for isolated ΣΔ ADCs in analog input modules operating in electrically noisy factory environments. Use Value: 107 dB PSRR suppresses 50/60 Hz mains harmonics and VFD noise-achieving >100 dB CMRR without additional filtering.

Semiconductor Test Equipment

Precision Data Acquisition Systems

Use Scenario: Automated wafer-level parametric testing requiring sub-LSB accuracy across temperature.

IC Role / Device Role / Timing Role: Primary voltage reference for 24-bit delta-sigma ADCs sampling device leakage currents and threshold voltages.

Use Value: 2 ppm/°C drift and 0.23 ppmp-p noise ensure <±0.5 LSB total error over −40°C to +125°C, eliminating per-temperature binning.

Use Scenario: Portable environmental monitoring logger capturing pH, dissolved oxygen, and conductivity with 18-bit resolution.

IC Role / Device Role / Timing Role: Stable excitation source and ADC reference for ratiometric sensor measurements using low-power microcontrollers.

Use Value: 400 mV dropout enables single-cell Li-ion (3.0–4.2 V) operation while maintaining 4.096 V output-extending battery life by 30% vs. older references.

Ultrasound Scanner

PLC Analog I/O Modules

Use Scenario: Beamforming front-end with 128-channel ADCs digitizing echo signals at 40 MSPS.

IC Role / Device Role / Timing Role: Low-noise reference for time-interleaved ADC arrays where correlated noise degrades SNR.

Use Value: 0.23 ppmp-p 1/f noise prevents 0.5 dB SNR degradation in 1–10 MHz bandwidth-meeting FDA Class II ultrasound image fidelity requirements.

Use Scenario: DIN-rail mounted industrial controller converting 4–20 mA field signals to digital with ±0.01% accuracy.

IC Role / Device Role / Timing Role: Precision reference for isolated ΣΔ ADCs in analog input modules operating in electrically noisy factory environments.

Use Value: 107 dB PSRR suppresses 50/60 Hz mains harmonics and VFD noise-achieving >100 dB CMRR without additional filtering.

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
REF7040QFKHT	LCCC-8 hermetic ceramic package; 18 ppm thermal hysteresis vs. 410 ppm in DGK; 35 ppm long-term stability identical.	Better suited for aerospace or downhole tools requiring zero-calibration lifetime stability; larger 5×5 mm footprint.	Select REF7040QFKHT when hysteresis <50 ppm is mandatory and board space permits larger package.
ADR4540BRZ	Analog Devices ADR4540: 3 ppm/°C drift, 0.25 ppmp-p noise, 100 μA quiescent current, SOIC-8 package.	Lower power but higher drift and noise; lacks enable pin and force-sense outputs-requires external buffer for heavy loads.	Choose ADR4540BRZ only for ultra-low-power (<100 μA) portable instruments where ±0.003% drift is acceptable.

Compared with REF7040QFKHT, REF7040QDGKR offers identical core specs (4.096 V, ±0.025%, 2 ppm/°C) in a smaller VSSOP-8 package but trades hysteresis performance for size; versus ADR4540BRZ, it delivers superior noise, drift, and integrated force-sense architecture at higher quiescent current-making it optimal for high-accuracy industrial DAQ, not ultra-low-power edge nodes.

Availability

REF7040QDGKR is available at Aetrix Electronics and suitable for semiconductor test equipment, precision data acquisition systems, and PLC analog I/O modules requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for REF7040QDGKR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and signal chain solutions.

The REF70 family was engineered specifically for high-resolution data converters in test & measurement and medical imaging-delivering industry-leading noise, drift, and PSRR in production-ready packages for demanding industrial environments.

FAQ

What is the maximum input voltage for REF7040QDGKR?

The absolute maximum input voltage for REF7040QDGKR is 20 V, but the recommended operating range is VOUT + VDO (≥4.496 V) up to 18 V. Exceeding 18 V risks reliability degradation per TI's Absolute Maximum Ratings table, and operation above 18 V voids warranty compliance. Always use ≥0.1 μF input decoupling for stability at high VIN.

Does REF7040QDGKR require an external capacitor on the OUTS pin?

No, REF7040QDGKR does not require an external capacitor on the OUTS pin. The OUTS pin is a high-impedance sense input intended for Kelvin connection to the load side of the reference path; adding capacitance here can cause instability or phase margin loss. Only the OUTF pin requires 1–100 μF low-ESR output capacitance per the datasheet.

Can REF7040QDGKR drive a 10 mA load continuously?

Yes, REF7040QDGKR is rated for ±10 mA continuous output current across −40°C to +125°C. At 10 mA, dropout is 400 mV (max), so minimum input is 4.496 V. Thermal derating applies above 85°C ambient-consult RθJA = 201.2°C/W and power dissipation limits in Section 7.4 to ensure junction temperature stays below 150°C.

How does the EN pin function in REF7040QDGKR?

The EN pin on REF7040QDGKR is an active-high enable input: driving >1.6 V enables the reference output, while ≤0.5 V places the device in shutdown mode drawing ≤12 μA. If left floating, the internal pull-up enables the device by default. No external pull-up is required, simplifying design in always-on applications like industrial sensors.

Is REF7040QDGKR compatible with ceramic output capacitors?

Yes, REF7040QDGKR is fully compatible with ceramic output capacitors ranging from 1 μF to 100 μF, provided their ESR is between 1 mΩ and 400 mΩ. X7R and X5R dielectrics are validated; avoid high-ESR electrolytics. Ceramic caps improve transient response and reduce 10 Hz–1 kHz noise by up to 15 dB versus tantalum alternatives.

REF7040QDGKR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Series

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 4.096V

Voltage - Output (Max):: -

Current - Output:: 10 mA

Tolerance:: ±0.025%

Temperature Coefficient:: 4.2ppm/°C

Noise - 0.1Hz to 10Hz:: 0.23ppmp-p

Noise - 10Hz to 10kHz:: 0.35ppmrms

Voltage - Input:: 4.496V ~ 18V

Current - Supply:: 6.5mA

Current - Cathode:: -

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-VSSOP

REF7040QDGKR FAQ

1.How can I place an order for REF7040QDGKR through Aetrix?

Please submit a Request for Quotation (RFQ) for REF7040QDGKR 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 REF7040QDGKR reliable?

The price and inventory of REF7040QDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF7040QDGKR is usually 5 days.

3.What payment methods are accepted for REF7040QDGKR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF7040QDGKR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for REF7040QDGKR?

REF7040QDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your REF7040QDGKR 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 REF7040QDGKR?

For technical support, including REF7040QDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF7040QDGKR requirements.

6.How does Aetrix verify that REF7040QDGKR is sourced from the original manufacturer or authorized distributors?

All REF7040QDGKR 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 REF7040QDGKR meets industry standards.

7.What is the process for return or replacement of REF7040QDGKR?

All REF7040QDGKR units undergo pre-shipment inspection (PSI). If there is an issue with REF7040QDGKR, 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 REF7040QDGKR part is unused and in its original packaging.

Return procedure for REF7040QDGKR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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