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Analog Devices Inc. ADR291GRZ-REEL7
- Part No.:
- ADR291GRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADR291GRZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.24% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,906
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Product details
Overview
ADR291GRZ-REEL7 from Analog Devices is a low-noise, micropower 2.5 V precision voltage reference IC using XFET® technology, delivering ±2 mV initial accuracy (E grade), 8 ppm/°C max temperature coefficient, and 8 μVp-p (0.1 Hz–10 Hz) noise. It operates from 2.8 V to 15 V supply, draws only 12 μA quiescent current, and supports 5 mA output - ideal for battery-powered 3 V data acquisition systems.
For engineers reviewing the ADR291GRZ-REEL7 datasheet, ADR291GRZ-REEL7 pinout, ADR291GRZ-REEL7 application, or ADR291GRZ-REEL7 equivalent, key selection criteria include ultra-low noise in sub-10 μVp-p band, micropower operation below 15 μA across −40°C to +125°C, and compatibility with high-precision SAR and Σ-Δ ADCs requiring stable 2.5 V references with minimal thermal drift.
Technical Context
The ADR291GRZ-REEL7 implements an XFET® reference architecture - not bandgap or buried Zener - generating a ~0.5 V intrinsic reference with negative TC compensated by a PTAT current source. This yields one-quarter the voltage noise of comparable bandgap references at same bias current.
Its internal topology includes vertically integrated NPN/PNP transistors enabling low dropout operation and high output current capability (5 mA), while NC pins (1,3,5,7,8 in SOIC) are reserved for manufacturing and must remain unconnected. Thermal hysteresis is limited to 50 ppm over −40°C ↔ +85°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±2 mV (E grade) - enables direct interface with 2.5 V ADCs without scaling or trimming. |
| Initial Accuracy | ±0.08% - ensures <±20 ppm error at system power-up before calibration. |
| Temp Coefficient | 8 ppm/°C max (E grade) - contributes ≤±1.0 mV drift over −40°C to +125°C operating range. |
| Low-Frequency Noise | 8 μVp-p (0.1 Hz–10 Hz) - preserves ENOB in 16-bit+ precision converters under DC-coupled conditions. |
| Quiescent Current | 12 μA typical at 25°C - supports >10-year battery life in solar-powered instrumentation with 200 mAh cells. |
| Supply Range | 2.8 V to 15 V - allows single-supply operation from 3 V batteries or industrial 12 V rails without LDO pre-regulation. |
| Output Current | 5 mA sourcing - drives ADC reference inputs, op-amp bias networks, and small DAC loads directly. |
Pinout & Package
ADR291GRZ-REEL7 is supplied in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and gull-wing leads. Pin 1 is marked by a beveled corner; all NC pins are internally reserved and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | NC | No internal connection; floating terminals - must be left unconnected per datasheet. |
| 2 | VIN | Input voltage terminal - accepts 2.8 V to 15 V; minimum headroom is 0.1 V at 5 mA load. |
| 4 | GND | Analog ground reference - requires low-impedance star connection to minimize noise coupling. |
| 6 | VOUT | Precision 2.5 V output - bypass with 0.1 µF ceramic + 10 µF tantalum for optimal PSRR and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Core | Replaces bandgap/Zener with lower-noise, lower-drift architecture - reduces 0.1–10 Hz noise by 75% vs. REF02. |
| Ultra-Low Quiescent Current | 12 μA max at 25°C - enables use in energy-harvesting nodes where average current budget is <15 μA. |
| High Output Drive | 5 mA continuous sourcing - eliminates need for external buffer in most 12–16 bit converter applications. |
| Extended Temp Range | −40°C to +125°C operation - qualified for automotive cabin and industrial motor control environments. |
| Low Thermal Hysteresis | 50 ppm max after −40°C → +85°C → −40°C cycling - ensures repeatable calibration in field-deployed instruments. |
Applications
| Portable Data Loggers | Precision Loop-Powered Sensors |
|---|---|
Use Scenario: Battery-operated environmental sensor node measuring temperature, humidity, and gas concentration with 16-bit ADC sampling at 10 SPS. IC Role / Device Role / Timing Role: Primary 2.5 V reference for AD7701 Σ-Δ ADC and bias network for signal-conditioning op-amps. Use Value: 8 μVp-p noise and 12 μA supply current extend battery life beyond 5 years while maintaining ≥15.2 ENOB. |
Use Scenario: 4–20 mA transmitter module powered solely from loop current, requiring stable reference despite 12–42 V rail variation. IC Role / Device Role / Timing Role: Precision 2.5 V reference for DAC and analog front-end, referenced to loop ground. Use Value: 30 ppm/V line regulation and 2.8 V min supply enable full 4–20 mA compliance across entire loop voltage range. |
| Solar-Powered Remote Meters | Handheld Test Equipment |
Use Scenario: Solar-charged water quality monitor deployed in remote locations, operating intermittently on supercapacitor storage. IC Role / Device Role / Timing Role: Low-power reference for multi-channel 12-bit SAR ADCs digitizing pH, ORP, and conductivity sensors. Use Value: 12 μA quiescent current and 8 ppm/°C TC ensure accurate readings during dawn/dusk transitions with minimal self-heating. |
Use Scenario: Portable multimeter with dual-slope ADC requiring stable reference during battery discharge from 3.6 V to 2.8 V. IC Role / Device Role / Timing Role: Primary 2.5 V reference for ADC and auto-zero amplifier offset compensation circuitry. Use Value: 2.8 V minimum supply and 5 mA drive support direct operation from Li-ion cell without boost converter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF02AZ | Bandgap-based; 1.8 mA supply current; 100 μVp-p noise; 50 ppm/°C TC; 8-pin SOIC. | Higher power and noise limit use in >14-bit systems or battery life >2 years. | Select REF02AZ only if legacy design reuse or cost sensitivity outweighs noise/power requirements. |
| ADR3425ARJZ-R7 | XFET-based; 100 μA supply current; 12 μVp-p noise; 10 ppm/°C TC; 6-pin SOT-23. | Higher quiescent current precludes use in solar-harvesting or coin-cell applications. | Choose ADR3425ARJZ-R7 when board space is constrained and 100 μA supply is acceptable. |
Compared with REF02AZ and ADR3425ARJZ-R7, the ADR291GRZ-REEL7 uniquely delivers sub-10 μVp-p noise with <15 μA supply - making it the only option among the three suitable for 16-bit+ portable instrumentation requiring multi-year battery life and high DC accuracy.
Availability
ADR291GRZ-REEL7 is available at Aetrix Electronics and suitable for portable instrumentation, loop-current-powered sensors, and solar-powered remote meters requiring stable component supply with guaranteed long-term availability and traceable lot history.
Supply support for ADR291GRZ-REEL7 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADR291GRZ-REEL7 belongs to Analog Devices' XFET® precision voltage reference product line, engineered specifically for ultra-low-noise, micropower applications in portable, industrial, and energy-constrained measurement systems.
FAQ
What is the maximum load current supported by the ADR291GRZ-REEL7?
The ADR291GRZ-REEL7 supports up to 5 mA of continuous sourcing current while maintaining specified accuracy and thermal stability. At 5 mA load and 25°C, output voltage deviation remains within ±100 ppm due to load regulation (30 ppm/mA typical). Exceeding 5 mA may cause excessive die heating and degrade long-term stability.
Does the ADR291GRZ-REEL7 require external capacitors for stability?
Yes - the ADR291GRZ-REEL7 requires a minimum 0.1 µF ceramic capacitor from VOUT to GND for high-frequency PSRR and transient response. For improved low-frequency noise rejection and load step recovery, a 10 µF tantalum or polymer capacitor in parallel is recommended. No series resistance or ferrite bead is needed.
Can the ADR291GRZ-REEL7 operate from a 3.0 V supply?
Yes - the ADR291GRZ-REEL7 is fully specified down to 2.8 V input, making it compatible with 3.0 V nominal Li-ion or alkaline battery supplies. At 3.0 V and 25°C, it delivers full 2.500 V output with 12 μA quiescent current and maintains 8 ppm/°C tempco performance across the full −40°C to +125°C range.
What is the meaning of 'GRZ' in ADR291GRZ-REEL7?
The 'GRZ' suffix denotes the 8-lead SOIC_N (R-8) package with Pb-free (RoHS-compliant) finish and tape-and-reel packaging (REEL7 = 7-inch reel). This matches JEDEC MS-012-AA mechanical dimensions and specifies 260°C reflow profile compatibility per IPC/JEDEC J-STD-020.
How does the XFET® architecture in ADR291GRZ-REEL7 differ from traditional bandgap references?
The ADR291GRZ-REEL7 uses XFET® (eXtra implanted junction FET) technology - not bandgap - generating a ~0.5 V intrinsic reference with inherently lower noise and thermal hysteresis. Its PTAT-compensated FET pair achieves 8 μVp-p noise (vs. >30 μVp-p for bandgaps) and 50 ppm hysteresis (vs. >100 ppm), with no curvature correction circuitry required.
ADR291GRZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- XFET®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- ±0.24%
- Temperature Coefficient:
- 25ppm/°C
- Noise - 0.1Hz to 10Hz:
- 8µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 3V ~ 15V
- Current - Supply:
- 15µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADR291GRZ-REEL7 FAQ
1.How can I place an order for ADR291GRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR291GRZ-REEL7 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 ADR291GRZ-REEL7 reliable?
The price and inventory of ADR291GRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR291GRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR291GRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR291GRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR291GRZ-REEL7?
ADR291GRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR291GRZ-REEL7 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 ADR291GRZ-REEL7?
For technical support, including ADR291GRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR291GRZ-REEL7 requirements.
6.How does Aetrix verify that ADR291GRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR291GRZ-REEL7 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 ADR291GRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR291GRZ-REEL7?
All ADR291GRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR291GRZ-REEL7, 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 ADR291GRZ-REEL7 part is unused and in its original packaging.
Return procedure for ADR291GRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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