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Texas Instruments REF5040AQDRQ1
- Part No.:
- REF5040AQDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF5040AQDRQ1.pdf
- Description:
- IC VREF SERIES 0.1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,889
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Product details
Overview
REF5040AQDRQ1 from Texas Instruments is a low-noise, very-low-drift, automotive-grade precision voltage reference IC delivering a stable 4.096 V output with ±0.1% initial accuracy, 3 ppm/°C max temperature drift, and 12 µVPP (0.1–10 Hz) output noise. It sources/sinks ±10 mA and operates from –40°C to +125°C in high-precision data acquisition systems.
For engineers reviewing the REF5040AQDRQ1 datasheet, REF5040AQDRQ1 pinout, REF5040AQDRQ1 application, or REF5040AQDRQ1 equivalent, key selection criteria include automotive AEC-Q100 qualification, SOIC-8 package compatibility, thermal hysteresis ≤10 ppm, long-term stability of 90 ppm/1000 hr, and TRIM/NR pin adjustability for ±15 mV output tuning.
Technical Context
The REF5040AQDRQ1 implements a precision bandgap core with proprietary curvature compensation to achieve 3 ppm/°C typical drift and 0.1% initial accuracy. Its architecture supports bidirectional current delivery (±10 mA), enabling direct driving of ADC reference inputs and op-amp bias networks without external buffers.
It features a dedicated TEMP pin (575 mV at 25°C, 2.64 mV/°C slope) for on-die temperature monitoring and a TRIM/NR pin that enables ±15-mV output adjustment or 14.5-Hz noise filtering via external capacitor-both functions validated across the full –40°C to +125°C automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.096 V nominal; exact value required for 16-bit ADC full-scale alignment (e.g., ADS8326). |
| Initial Accuracy | ±0.1% max at 25°C; eliminates need for system-level calibration in automotive sensor signal chains. |
| Temp Drift | 3 ppm/°C typ, 8 ppm/°C max over –40°C to +125°C; ensures <±0.42 mV output shift across full automotive ambient range. |
| Output Noise | 12 µVPP (0.1–10 Hz); low enough to preserve ENOB >15.5 bits in 16-bit SAR ADCs like ADS8326. |
| Load Current | ±10 mA sourcing/sinking capability; directly drives ADC reference inputs and op-amp feedback networks without buffer stages. |
| Quiescent Current | 1.2 mA max over temperature; enables low-power operation in always-on vehicle subsystems. |
| ESD Rating | ±500 V HBM (AEC Q100-002); meets automotive board-level ESD robustness requirements. |
Pinout & Package
REF5040AQDRQ1 is housed in an SOIC-8 (D) package with exposed pad (not electrically connected). Pin 1 is DNC (do not connect), Pin 2 is VIN (input supply), Pin 3 is TEMP (temperature-sensing output), Pin 4 is GND, Pin 5 is TRIM/NR (adjust/noisefilter), Pin 6 is VOUT (4.096 V reference), Pin 7 is NC (no internal connection), Pin 8 is DNC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (DNC) | No-connect terminal | Must remain unconnected; floating or tied to GND/VIN causes undefined behavior. |
| Pin 2 (VIN) | Supply input | Accepts 4.296 V to 18 V; dropout as low as 200 mV enables operation from 4.3 V rails. |
| Pin 3 (TEMP) | Temperature monitor output | Provides 575 mV @ 25°C, 2.64 mV/°C slope; requires op-amp buffering (e.g., OPA333) for accurate readout. |
| Pin 4 (GND) | Analog ground reference | Primary return path for VOUT and TEMP; must be low-impedance, separate from digital ground. |
| Pin 5 (TRIM/NR) | Bandgap trim & noise filter node | Enables ±15 mV VOUT adjustment or 1 µF-to-GND low-pass filter (14.5 Hz cutoff) to reduce broadband noise. |
| Pin 6 (VOUT) | Precision reference output | Delivers 4.096 V ±0.1% with ±10 mA drive; requires 1–50 µF low-ESR output capacitor (ESR ≤1.5 Ω). |
| Pin 7 (NC) | No internal connection | Not bonded; may be left open or tied to GND for mechanical stability-no electrical effect. |
| Pin 8 (DNC) | No-connect terminal | Identical to Pin 1; must remain unconnected per datasheet directive. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +125°C ambient, including thermal cycling and humidity testing. |
| Low thermal hysteresis | ≤10 ppm after –40°C/+125°C cycling; preserves calibration integrity in start-stop engine cycles. |
| Long-term stability | 90 ppm/1000 hr (typ) post-burn-in; reduces field failure risk in 10+ year automotive deployments. |
| Integrated TEMP pin | On-die temperature sensing with 2.64 mV/°C linearity; enables real-time thermal compensation of downstream analog circuits. |
| TRIM/NR configurability | Single-pin support for either ±15-mV output fine-tuning or 14.5-Hz noise filtering-no additional components needed. |
Applications
| Automotive ADAS Sensor Signal Conditioning | Industrial PLC Analog Input Modules |
|---|---|
Use Scenario: Front radar or camera module analog front-end requiring stable reference for 16-bit ADC digitization of temperature-compensated RF or image sensor signals. IC Role / Device Role / Timing Role: Primary voltage reference for ADS8326 SAR ADC; supplies precise 4.096 V reference while TEMP pin feeds compensation algorithm in MCU. Use Value: 3 ppm/°C drift and 12 µVPP noise maintain ≥15.5 ENOB across –40°C to +105°C junction, meeting ISO 26262 ASIL-B signal integrity targets. | Use Scenario: DIN-rail mounted programmable logic controller acquiring 4–20 mA current loop signals with 0.1% total measurement uncertainty. IC Role / Device Role / Timing Role: Reference source for multi-channel simultaneous-sampling ADC; TRIM/NR pin used to calibrate out PCB trace resistance error. Use Value: ±0.1% initial accuracy and ±10 mA drive eliminate external gain/offset trimming, reducing BOM count and calibration labor by 30%. |
| Medical Patient Monitoring ECG Front-End | Aerospace Avionics Data Acquisition |
Use Scenario: Portable ECG device digitizing microvolt-level cardiac signals using low-noise instrumentation amplifiers and 16-bit ADCs. IC Role / Device Role / Timing Role: Low-noise reference for ADC and PGA biasing; TEMP pin monitors die temperature to correct amplifier offset drift in real time. Use Value: 12 µVPP (0.1–10 Hz) noise floor ensures <1 µV RMS integrated noise-critical for detecting sub-10 µV ST-segment deviations. | Use Scenario: Flight control surface position sensor interface requiring radiation-tolerant, high-reliability reference under wide thermal and vibration stress. IC Role / Device Role / Timing Role: Primary reference for redundant ADC channels; long-term stability (90 ppm/1000 hr) supports 15-year service life without recalibration. Use Value: AEC-Q100 qualification correlates with DO-160 environmental robustness; 150°C max junction rating accommodates conduction-cooled avionics enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5040AIDR | Same 4.096 V output, 0.1% accuracy, and SOIC-8 package-but industrial grade (–40°C to +125°C, non-AEC-Q100). | Lacks automotive qualification; unsuitable for safety-critical vehicle systems requiring AEC-Q100 documentation and test reports. | Select REF5040AIDR only for cost-sensitive industrial designs where AEC-Q100 compliance is not mandated. |
| ADR4540BRTZ-REEL7 | 4.096 V output, 0.04% initial accuracy, 2 ppm/°C drift-but uses SOT-23-5 package and lacks TEMP/TRIM pins. | No on-die temperature monitoring or output adjustment; requires external circuitry for noise filtering or calibration trim. | Choose ADR4540BRTZ-REEL7 when ultra-low drift (<2 ppm/°C) is prioritized over diagnostic capability and layout simplicity. |
Compared with REF5040AIDR, REF5040AQDRQ1 adds AEC-Q100 qualification and tighter thermal hysteresis (10 ppm vs. 15 ppm), making it mandatory for automotive ECUs; versus ADR4540BRTZ-REEL7, REF5040AQDRQ1 trades 1 ppm/°C lower drift for integrated diagnostics (TEMP) and configurability (TRIM/NR), simplifying system design.
Availability
REF5040AQDRQ1 is available at Aetrix Electronics and suitable for automotive ADAS sensor modules, industrial PLC analog input cards, and medical patient monitoring equipment requiring stable component supply with guaranteed long-term availability and AEC-Q100 traceability.
Supply support for REF5040AQDRQ1 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 experience in high-reliability automotive and industrial IC design.
The REF50xxA-Q1 product line was engineered specifically for automotive and industrial data acquisition systems demanding ultra-stable voltage references with integrated diagnostics and AEC-Q100 compliance.
FAQ
What is the maximum allowable input voltage for REF5040AQDRQ1?
The absolute maximum input voltage for REF5040AQDRQ1 is 18 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term performance, TI recommends limiting VIN to ≤15 V in continuous operation, especially at high ambient temperatures where power dissipation increases junction temperature.
Does REF5040AQDRQ1 support negative reference generation?
REF5040AQDRQ1 itself provides only a positive 4.096 V reference output and cannot generate negative voltages directly. However, it can serve as the precision positive rail in conjunction with a zero-drift op amp like OPA735 to create a matched ±4.096 V dual-supply reference, as demonstrated in Figure 31 of the SBOS456H datasheet.
How does the TEMP pin on REF5040AQDRQ1 function in practice?
The TEMP pin on REF5040AQDRQ1 outputs a voltage proportional to die temperature: VTEMP = 575 mV + 2.64 mV/°C × T. It has ~60 kΩ output impedance, so it must be buffered with a low-input-bias-current op amp (e.g., OPA333) before ADC sampling to avoid loading errors and ensure ±15°C accuracy.
Can the TRIM/NR pin of REF5040AQDRQ1 be used simultaneously for noise reduction and output adjustment?
No-the TRIM/NR pin of REF5040AQDRQ1 supports either ±15-mV output adjustment (via resistive divider) or noise reduction (via 1 µF capacitor to GND), but not both simultaneously. Using a capacitor disables resistive trimming, and applying a DC voltage divider prevents effective low-pass filtering due to altered pole location.
What is the recommended output capacitor for REF5040AQDRQ1 and why?
Texas Instruments specifies a 1–50 µF low-ESR ceramic or tantalum capacitor from VOUT to GND, with ESR ≤1.5 Ω. This stabilizes the internal 1.2-V bandgap amplifier, suppresses gain peaking, and reduces high-frequency noise-critical for maintaining 12 µVPP (0.1–10 Hz) performance in precision ADC applications.
REF5040AQDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- ±0.1%
- Temperature Coefficient:
- 8ppm/°C
- Noise - 0.1Hz to 10Hz:
- 12µVpp/V
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.296V ~ 18V
- Current - Supply:
- 1.2mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF5040AQDRQ1 FAQ
1.How can I place an order for REF5040AQDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF5040AQDRQ1 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 REF5040AQDRQ1 reliable?
The price and inventory of REF5040AQDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF5040AQDRQ1 is usually 5 days.
3.What payment methods are accepted for REF5040AQDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF5040AQDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF5040AQDRQ1?
REF5040AQDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF5040AQDRQ1 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 REF5040AQDRQ1?
For technical support, including REF5040AQDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF5040AQDRQ1 requirements.
6.How does Aetrix verify that REF5040AQDRQ1 is sourced from the original manufacturer or authorized distributors?
All REF5040AQDRQ1 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 REF5040AQDRQ1 meets industry standards.
7.What is the process for return or replacement of REF5040AQDRQ1?
All REF5040AQDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF5040AQDRQ1, 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 REF5040AQDRQ1 part is unused and in its original packaging.
Return procedure for REF5040AQDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF5040AQDRQ1 Tags
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