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Analog Devices Inc. ADR291GRUZ-REEL
- Part No.:
- ADR291GRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADR291GRUZ-REEL.pdf
- Description:
- IC VREF SERIES 0.24% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,129
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Product details
Overview
ADR291GRUZ-REEL 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 high-resolution ADC/DAC biasing in battery-powered instrumentation.
For engineers reviewing the ADR291GRUZ-REEL datasheet, ADR291GRUZ-REEL pinout, ADR291GRUZ-REEL application, or ADR291GRUZ-REEL equivalent, this page provides verified package mapping (8-lead TSSOP RU-8), confirmed pin functions (VIN, GND, VOUT), real-world load regulation (30 ppm/mA typ), thermal hysteresis (50 ppm), and validated alternatives for portable, loop-powered, and precision converter systems.
Technical Context
The ADR291GRUZ-REEL implements an XFET® reference architecture - not bandgap or buried Zener - enabling intrinsic low noise (−120 ppm/K TC baseline), ultralinear temperature drift compensation, and <15 μA supply current. Its core uses two matched JFETs with extra-channel implant to generate a stable ~0.5 V reference, amplified and PTAT-compensated to yield 2.500 V output.
This device is specified across −40°C to +125°C, supports 5 mA sourcing, features 30 ppm/V line regulation (typ), and maintains long-term stability of 50 ppm after 1000 hours at 125°C. The 8-lead TSSOP (RU-8) package includes five NC pins reserved for manufacturing - no external connection permitted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±2 mV (E grade) - enables direct interface with 12-bit+ SAR/Σ-Δ ADCs without trimming. |
| Initial Accuracy | ±2 mV (0.08%) - ensures ≤0.5 LSB error in 12-bit systems with 2.5 V full-scale range. |
| Temp Coefficient | 8 ppm/°C max (E grade) - contributes ≤200 μV drift over −40°C to +85°C operating range. |
| Low-Frequency Noise | 8 μVp-p (0.1 Hz–10 Hz) - critical for sub-16-bit precision in weigh scales and sensor front-ends. |
| Supply Current | 12 μA max at 25°C - allows >1-year operation on a 200 mAh coin cell in sleep-mode instrumentation. |
| Load Regulation | 30 ppm/mA typ - introduces ≤150 μV shift when driving 5 mA loads (e.g., op-amp bias networks). |
| Line Regulation | 30 ppm/V typ - holds output stable despite ±0.5 V supply variation in LDO-fed systems. |
Pinout & Package
ADR291GRUZ-REEL is packaged in an 8-lead TSSOP (RU-8), RoHS-compliant, with 0.65 mm lead pitch. Five pins are internally reserved No Connect (NC); only VIN, GND, and VOUT are functional. Thermal resistance θJA = 240°C/W reflects typical PCB layout with minimal copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 7, 8 | NC | No internal connection - must remain unconnected per datasheet; floating or tied to GND degrades noise performance. |
| 2 | VIN | Input voltage terminal - requires ≥2.8 V supply; dropout voltage is load-dependent (e.g., 0.4 V @ 5 mA). |
| 4 | GND | Analog ground reference - must be star-connected to minimize ground bounce in mixed-signal systems. |
| 6 | VOUT | Precision 2.5 V output - bypassed with 0.1 µF ceramic + 10 µF bulk capacitor per Figure 32 for optimal PSRR and noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Architecture | Delivers one-quarter the voltage noise of bandgap references at same current, enabling ultra-low-noise data acquisition. |
| 5 mA Output Current Capability | Sources full load for op-amps, ADC reference inputs, and DAC buffers without external gain stages. |
| −40°C to +125°C Operation | Validated over full extended industrial range - suitable for automotive cabin sensors and downhole tools. |
| Thermal Hysteresis ≤50 ppm | Minimizes calibration drift after thermal cycling - critical for field-deployed test equipment requiring recalibration intervals >1 year. |
| Pin-Compatible with REF02/REF19x | Enables drop-in replacement in legacy designs using REF02 (2.5 V) or REF19x series, reducing redesign effort. |
Applications
| Portable Instrumentation | Precision ADC/DAC Reference |
|---|---|
Use Scenario: Handheld multimeter with 16-bit Σ-Δ ADC and auto-ranging input stage. IC Role / Device Role / Timing Role: Primary 2.5 V reference for ADC conversion and analog front-end gain calibration. Use Value: 8 μVp-p noise and 8 ppm/°C TC ensure ≤0.005% measurement uncertainty across 0–40°C ambient range. |
Use Scenario: Battery-powered data logger sampling thermocouples and strain gauges at 10 SPS. IC Role / Device Role / Timing Role: Stable excitation and reference source for ratiometric measurements with AD7701 ADC. Use Value: 12 μA supply current extends battery life to >18 months; 5 mA drive capability powers ADC's internal buffer. |
| Solar-Powered Sensors | Loop-Powered Transmitters |
Use Scenario: Remote environmental node powered by 3.6 V Li-SOCl₂ battery + solar trickle charge. IC Role / Device Role / Timing Role: Low-voltage reference for sensor signal conditioning and microcontroller ADC. Use Value: 2.8 V minimum supply enables operation during low-light solar conditions; 50 ppm long-term stability reduces field recalibration frequency. |
Use Scenario: 4–20 mA industrial transmitter with HART modulation, powered from 24 V loop. IC Role / Device Role / Timing Role: Precision 2.5 V reference for DAC-based current loop control and sensor linearization. Use Value: 30 ppm/mA load regulation ensures <0.1% span error across full 20 mA output range; wide temp range supports cabinet-mounted deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR291ARMZ-REEL | Same electrical specs, but in 8-lead SOIC (R-8) package - θJA = 158°C/W vs. 240°C/W for RU-8; larger footprint. | Better thermal performance in high-power-density layouts; less suitable for ultra-thin portable enclosures. | Select ADR291ARMZ-REEL if board space permits and thermal margin is constrained; otherwise prefer RU-8 for compactness. |
| REF192GSZ-REEL | Bandgap-based 2.5 V reference; higher 20 μVp-p noise, 50 ppm/°C TC (max), 65 μA supply current. | Limited to lower-resolution (<14-bit) applications; unsuitable for low-noise sensor interfaces or long-term stability-critical use. | Choose REF192GSZ-REEL only for cost-sensitive, non-precision applications where 12-bit accuracy suffices and power budget >50 μA is acceptable. |
Compared with ADR291GRUZ-REEL, ADR291ARMZ-REEL offers superior thermal dissipation in SOIC but occupies 2.5× more PCB area, while REF192GSZ-REEL trades 5.4× higher noise and 6× higher supply current for lower unit cost - making ADR291GRUZ-REEL optimal for space-constrained, battery-operated, high-fidelity measurement systems.
Availability
ADR291GRUZ-REEL is available at Aetrix Electronics and suitable for portable instrumentation, precision ADC/DAC reference, and loop-powered transmitter applications requiring stable component supply, long-term calibration integrity, and ultra-low power consumption.
Supply support for ADR291GRUZ-REEL 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 ADR291GRUZ-REEL belongs to Analog Devices' XFET® voltage reference product line, engineered specifically for ultra-low-noise, micropower, high-stability applications in portable, industrial, and precision measurement systems.
FAQ
What is the maximum load current supported by the ADR291GRUZ-REEL?
The ADR291GRUZ-REEL is rated for up to 5 mA continuous output current while maintaining specified accuracy and regulation performance. At 5 mA load, the minimum input-output differential is 0.4 V (typ) at +25°C, increasing to ~0.7 V at −40°C. Exceeding 5 mA may cause output voltage deviation beyond datasheet limits and increased thermal hysteresis.
Can the ADR291GRUZ-REEL operate from a 3.0 V supply in a battery-powered system?
Yes - the ADR291GRUZ-REEL has a minimum supply voltage of 2.8 V, making it fully compatible with single-cell Li-ion (3.0–4.2 V) or alkaline (3.0 V nominal) sources. At 3.0 V input, it delivers full 2.500 V output with ≤2 mV initial error and maintains 12 μA quiescent current, enabling multi-year operation in low-duty-cycle sensing nodes.
How does the ADR291GRUZ-REEL achieve lower noise than bandgap references?
The ADR291GRUZ-REEL uses XFET® technology, which relies on a compensated JFET pinch-off voltage difference (~0.5 V) instead of bandgap's noisy PTAT-compensated base-emitter junction. This intrinsic reference exhibits ~30× lower inherent TC slope, requiring less correction circuitry - directly reducing dominant 1/f and thermal noise components to just 8 μVp-p (0.1–10 Hz).
Are the NC pins on the ADR291GRUZ-REEL safe to tie to ground?
No - the NC pins (1, 3, 5, 7, 8) on the ADR291GRUZ-REEL are internally reserved for manufacturing test and process monitoring. Per Analog Devices' datasheet (Rev. F, p.7), connecting them to any potential - including GND - may degrade noise performance, increase thermal hysteresis, or cause unpredictable output behavior. They must remain unconnected and unstubbed.
What is the long-term stability specification for the ADR291GRUZ-REEL?
The ADR291GRUZ-REEL exhibits ≤50 ppm long-term stability after 1000 hours of operation at +125°C, measured at +25°C before and after stress. This corresponds to a maximum drift of ±125 μV on the 2.500 V output - critical for applications like calibration standards and metrology equipment where annual recalibration intervals are required.
ADR291GRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- XFET®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-TSSOP
ADR291GRUZ-REEL FAQ
1.How can I place an order for ADR291GRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR291GRUZ-REEL 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 ADR291GRUZ-REEL reliable?
The price and inventory of ADR291GRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR291GRUZ-REEL is usually 5 days.
3.What payment methods are accepted for ADR291GRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR291GRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR291GRUZ-REEL?
ADR291GRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR291GRUZ-REEL 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 ADR291GRUZ-REEL?
For technical support, including ADR291GRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR291GRUZ-REEL requirements.
6.How does Aetrix verify that ADR291GRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADR291GRUZ-REEL 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 ADR291GRUZ-REEL meets industry standards.
7.What is the process for return or replacement of ADR291GRUZ-REEL?
All ADR291GRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADR291GRUZ-REEL, 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 ADR291GRUZ-REEL part is unused and in its original packaging.
Return procedure for ADR291GRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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