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Analog Devices Inc. ADR421ARMZ-REEL7
- Part No.:
- ADR421ARMZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADR421ARMZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.12% 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,547
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Product details
Overview
ADR421ARMZ-REEL7 from Analog Devices is an ultraprecision XFET® voltage reference delivering 2.500 V output with ±1 mV (±0.04%) initial accuracy, 3 ppm/°C max temperature coefficient, and 1.75 µV p-p (0.1 Hz to 10 Hz) low-frequency noise. It operates from 4.5 V to 18 V supply, supports 10 mA output current, and is used in high-resolution ADC/DAC biasing for optical network control circuits and portable medical instrumentation.
For engineers reviewing the ADR421ARMZ-REEL7 datasheet, ADR421ARMZ-REEL7 pinout, ADR421ARMZ-REEL7 application, or ADR421ARMZ-REEL7 equivalent, key selection criteria include long-term stability (50 ppm/1000 h), load regulation (70 ppm/mA), trim capability (±0.5% adjustment), and SOIC-8/MSOP-8 package compatibility in precision data acquisition systems.
Technical Context
The ADR421ARMZ-REEL7 implements second-generation XFET® architecture, using two matched JFETs-one with extra channel implant-to generate a stable ~0.5 V intrinsic reference with −120 ppm/°C TC, then applying PTAT current-based curvature correction to achieve <3 ppm/°C total drift over −40°C to +125°C. This eliminates reliance on bandgap or buried Zener topologies.
Its trim terminal (Pin 5) enables ±0.5% output voltage adjustment without degrading temperature coefficient or noise performance. The device requires no output capacitor for stability but accepts up to 10 µF for improved load transient response-turn-on settling time remains ≤10 µs regardless of capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±1 mV (B-grade); enables direct interface with 2.5 V full-scale SAR ADCs without gain calibration. |
| Initial Accuracy | ±0.04% (±1 mV); reduces system-level offset error in 16-bit+ data converters. |
| Temp Coefficient | 3 ppm/°C max (−40°C to +125°C); ensures <±90 ppm drift across industrial temperature range. |
| Voltage Noise | 1.75 µV p-p (0.1–10 Hz); preserves SNR in precision 24-bit delta-sigma ADC front-ends. |
| Load Regulation | 70 ppm/mA; maintains <±70 ppm error under 10 mA dynamic load changes. |
| Quiescent Current | 500 µA max; supports battery-powered instrumentation with multi-year runtime. |
| Supply Headroom | 2 V min (VIN ≥ 4.5 V); allows operation from single Li-ion or regulated 5 V rails. |
Pinout & Package
ADR421ARMZ-REEL7 is packaged in an 8-lead MSOP (RM) with 0.65 mm pitch and thermal resistance θJA = 190°C/W. Pin-compatible with 8-lead SOIC (R) variant ADR421ARZ-REEL7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 TP | Test Pin | Factory test connection only; must remain unconnected in circuit to avoid malfunction. |
| 2 VIN | Input Supply | Accepts 4.5 V to 18 V; requires ≥2 V headroom above VOUT for regulation. |
| 3, 7 NIC | No Internal Connection | Electrically floating pins; no PCB routing or grounding required. |
| 4 GND | Ground Reference | Primary return path; must connect to low-impedance analog ground plane. |
| 5 TRIM | Voltage Adjustment | Connects to external potentiometer for ±0.5% output tuning without affecting TC or noise. |
| 6 VOUT | Reference Output | Delivers 2.500 V with 10 mA sourcing capability; bypass with 0.1 µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| XFET® Reference Architecture | Eliminates thermal hysteresis (40 ppm typical) and achieves lower noise than bandgap or buried Zener alternatives. |
| Trim Terminal (Pin 5) | Enables field calibration of output voltage over ±0.5% range while preserving 3 ppm/°C TC and 1.75 µV p-p noise. |
| Wide Temperature Range | Specified from −40°C to +125°C; supports deployment in automotive engine control units and industrial PLC modules. |
| No Output Capacitor Required | Stable under all load conditions up to 10 mA; optional 0.1 µF capacitor improves noise filtering without compromising settling time. |
| Low Power Dissipation | Max 500 µA quiescent current enables use in energy-constrained portable instruments with >5-year battery life. |
Applications
| Optical Network Control Circuits | Precision Data Acquisition Systems |
|---|---|
Use Scenario: Biasing DACs driving laser diode modulation current in 100G coherent transceivers. IC Role / Device Role / Timing Role: Provides ultra-stable 2.5 V reference for 16-bit DACs controlling optical power and phase. Use Value: 1.75 µV p-p noise and 3 ppm/°C TC prevent bit errors caused by reference-induced INL/DNL drift under thermal cycling. |
Use Scenario: Front-end reference for 24-bit delta-sigma ADCs in portable multimeters and insulation testers. IC Role / Device Role / Timing Role: Supplies excitation voltage to precision resistor networks and ADC reference input simultaneously. Use Value: 50 ppm/1000 h long-term stability eliminates annual recalibration; 70 ppm/mA load regulation handles multiplexed sensor switching. |
| Battery-Powered Instrumentation | Portable Medical Instruments |
Use Scenario: Reference source in handheld gas analyzers powered by two AA cells (3.0 V nominal). IC Role / Device Role / Timing Role: Regulates 2.5 V rail for microcontroller ADC and sensor signal conditioning amplifiers. Use Value: 4.5 V minimum VIN accommodates full battery discharge curve; 500 µA IQ extends operating time beyond 200 hours. |
Use Scenario: ECG front-end reference for 24-bit biopotential ADCs in wearable cardiac monitors. IC Role / Device Role / Timing Role: Sets common-mode voltage and ADC reference for differential lead measurements. Use Value: 1.75 µV p-p low-frequency noise directly translates to <0.1 µV RMS input-referred noise-critical for sub-microvolt ST-segment detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF5025IDR | 2.5 V output, 3 ppm/°C TC, but higher 3.8 µV p-p noise (0.1–10 Hz) and 950 µA IQ. | Less suitable for ultra-low-noise 24-bit delta-sigma ADCs; better for cost-sensitive industrial sensors. | Select REF5025IDR only when noise <2 µV p-p is not required and higher quiescent current is acceptable. |
| ADR441ARMZ-REEL7 | 2.5 V output, lower 1.5 ppm/°C TC, but 2.2 µV p-p noise and 1.2 mA IQ; requires ≥3.5 V headroom. | Preferred for metrology-grade equipment where TC dominates error budget; unsuitable for battery-powered designs. | Choose ADR441ARMZ-REEL7 when TC <2 ppm/°C is mandatory and system can support higher supply voltage and power. |
Compared with REF5025IDR and ADR441ARMZ-REEL7, ADR421ARMZ-REEL7 uniquely balances ultra-low noise (1.75 µV p-p), low power (500 µA), and industrial temperature range in a space-constrained MSOP-8 package-making it optimal for portable precision instrumentation where all three parameters are simultaneously critical.
Availability
ADR421ARMZ-REEL7 is available at Aetrix Electronics and suitable for precision data acquisition systems, optical network control circuits, and portable medical instruments requiring stable component supply with guaranteed long-term availability and traceable lot history.
Supply support for ADR421ARMZ-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, with design centers worldwide.
The ADR42x series was developed specifically for ultraprecision voltage reference applications demanding low noise, low drift, and high stability in compact packages-targeting high-resolution data converters, test equipment, and medical diagnostics systems.
FAQ
What is the maximum load current supported by the ADR421ARMZ-REEL7?
The ADR421ARMZ-REEL7 delivers up to 10 mA of output current while maintaining specified accuracy, load regulation (70 ppm/mA), and thermal stability across −40°C to +125°C. Exceeding 10 mA may cause output voltage deviation beyond datasheet limits and increase junction temperature beyond safe operating area.
Does the ADR421ARMZ-REEL7 require an output capacitor for stability?
No, the ADR421ARMZ-REEL7 is internally compensated and remains stable without any output capacitor under all load conditions up to 10 mA. A 0.1 µF ceramic capacitor is recommended solely for noise filtering; larger capacitors (up to 10 µF) improve load transient response but increase turn-on settling time proportionally.
Can the ADR421ARMZ-REEL7 be used with a 3.3 V supply rail?
No-the ADR421ARMZ-REEL7 requires a minimum supply voltage of 4.5 V (VIN ≥ VOUT + 2 V). A 3.3 V rail is insufficient and will prevent proper regulation; use instead the ADR420ARMZ-REEL7 (2.048 V output, 4 V min VIN) or ADR3425 (2.5 V, 3.0 V min VIN) for 3.3 V systems.
What is the purpose of the TRIM pin on the ADR421ARMZ-REEL7?
Pin 5 (TRIM) allows adjustment of the ADR421ARMZ-REEL7 output voltage over a ±0.5% range (±12.5 mV around 2.500 V) using an external potentiometer. This calibration does not degrade temperature coefficient, noise, or long-term stability-enabling system-level trimming after PCB assembly and solder-induced shift compensation.
How does the ADR421ARMZ-REEL7 compare to bandgap voltage references in noise performance?
The ADR421ARMZ-REEL7 achieves 1.75 µV p-p (0.1–10 Hz) noise-typically 3× lower than precision bandgap references-due to its XFET® architecture's intrinsically lower temperature coefficient (−120 ppm/°C vs. −2 mV/°C), which minimizes correction circuitry noise contribution. This makes it superior for 24-bit+ data converter applications where reference noise dominates system ENOB.
ADR421ARMZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 10 mA
- Tolerance:
- ±0.12%
- Temperature Coefficient:
- 10ppm/°C
- Noise - 0.1Hz to 10Hz:
- 1.75µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4.5V ~ 18V
- Current - Supply:
- 600µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ADR421ARMZ-REEL7 FAQ
1.How can I place an order for ADR421ARMZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADR421ARMZ-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 ADR421ARMZ-REEL7 reliable?
The price and inventory of ADR421ARMZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADR421ARMZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADR421ARMZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADR421ARMZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADR421ARMZ-REEL7?
ADR421ARMZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADR421ARMZ-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 ADR421ARMZ-REEL7?
For technical support, including ADR421ARMZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADR421ARMZ-REEL7 requirements.
6.How does Aetrix verify that ADR421ARMZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADR421ARMZ-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 ADR421ARMZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADR421ARMZ-REEL7?
All ADR421ARMZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADR421ARMZ-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 ADR421ARMZ-REEL7 part is unused and in its original packaging.
Return procedure for ADR421ARMZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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