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Analog Devices Inc. REF02CS
- Part No.:
- REF02CS
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
REF02CS.pdf
- Description:
- IC VREF SERIES 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,867
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Product details
Overview
REF02CS from Analog Devices is a precision 5.0 V voltage reference IC in an 8-lead SOIC package, delivering ±0.3% initial accuracy (A/E grades), 8.5 ppm/°C max temperature coefficient, 15 µVp-p (0.1–10 Hz) low-frequency noise, and 10 mA load-driving capability - used as a stable excitation source in high-resolution ADCs and DACs for industrial data acquisition systems.
For engineers reviewing the REF02CS datasheet, REF02CS pinout, REF02CS application, or REF02CS equivalent, this page provides verified specifications, SOIC-8 terminal mapping, temperature-sensing functionality via the TEMP pin, trim-adjustable output, and validated alternative options for precision reference design.
Technical Context
The REF02CS implements a laser-trimmed bandgap core with PTAT and CTAT voltage generation, buffered by an internal op amp to set a precise 5.0 V output. Its TEMP pin provides direct access to the unbuffered bandgap voltage (580 mV at 25°C, 1.96 mV/°C slope) for external temperature monitoring without additional components.
It features a TRIM terminal enabling ±3.0% output adjustment using a 10 kΩ potentiometer, and supports input voltages from 7.0 V to 36 V while maintaining regulation across −40°C to +85°C ambient (C-grade rating for SOIC package). Dropout is fixed at 2 V independent of load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V nominal, ±15 mV (±0.3%) initial accuracy for A/E grades - ensures minimal system gain error in 16-bit+ converter interfaces. |
| Tempco | 8.5 ppm/°C max (−55°C to +125°C) - enables <±0.4 mV drift over full industrial range, critical for calibration-stable instruments. |
| Noise (0.1–10 Hz) | 15 µVp-p typical - contributes <0.5 LSB error in 20-bit 5 V full-scale SAR ADCs. |
| Load Drive | 10 mA sourcing capability - directly powers ADC reference inputs, op-amp bias networks, or small sensor bridges without external buffers. |
| Supply Range | 7.0 V to 36 V - accommodates wide-input industrial supplies and battery-backed systems with minimal dropout headroom. |
| Quiescent Current | 1.4 mA max - enables low-power portable instrumentation with predictable supply current budgeting. |
| TEMP Pin Output | 580 mV at 25°C, 1.96 mV/°C sensitivity - allows ratiometric temperature measurement with 1°C resolution using a 16-bit ADC. |
Pinout & Package
REF02CS is housed in an 8-lead SOIC package (S-suffix), with thermal resistance θJA = 130°C/W and θJC = 43°C/W. Pin 1 is NC (no internal connection); pins 7 and 8 are also NC. GND (Pin 4) must be connected to system ground plane for stability and noise rejection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8 | NC | No internal connection; leave floating or tie to ground per layout best practice - not reserved for factory test in commercial SOIC. |
| 2 | VIN | Unregulated input supply (7–36 V); requires ≥0.1 µF ceramic bypass capacitor placed adjacent to pin. |
| 3 | TEMP | Bandgap-derived analog temperature output (580 mV @ 25°C, 1.96 mV/°C); high-impedance node - buffer before ADC sampling. |
| 4 | GND | Analog ground reference; connect directly to low-noise ground plane with short trace to minimize PSRR degradation. |
| 5 | TRIM | Adjustment node for ±3% output tuning via external 10 kΩ potentiometer - enables system-level calibration of gain/offset errors. |
| 6 | VOUT | Stable 5.0 V reference output; requires ≥0.1 µF ceramic capacitor to ground for optimal noise and transient performance. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed bandgap core | Enables ±0.3% initial accuracy and 8.5 ppm/°C tempco without external calibration - reduces production test time and BOM count. |
| Integrated TEMP pin | Delivers factory-calibrated 1.96 mV/°C analog temperature signal - eliminates need for separate sensor IC in space-constrained designs. |
| TRIM terminal with ±3% adjustability | Allows post-assembly correction of system-level errors (e.g., PCB trace resistance, solder thermal shift) without firmware changes. |
| High PSRR (≥80 dB up to 10 kHz) | Maintains output stability despite ripple on 24 V industrial rails - avoids dedicated LDO pre-regulation in multi-rail systems. |
| 10 mA output drive | Sources full current for dual 16-bit ADC references or op-amp bias networks - removes requirement for external unity-gain buffer stages. |
Applications
| Industrial Data Acquisition | Precision Instrumentation |
|---|---|
Use Scenario: High-channel-count PLC analog input modules digitizing 4–20 mA sensor signals with 18-bit sigma-delta ADCs. IC Role / Device Role / Timing Role: Primary voltage reference for ADC reference input and DAC output scaling, plus TEMP pin used for cold-junction compensation. Use Value: 8.5 ppm/°C tempco ensures <±0.75 mV error over −25°C to +70°C operating range, meeting IEC 61000-6-2 immunity requirements. |
Use Scenario: Portable handheld multimeter with auto-ranging, true RMS conversion, and on-board calibration memory. IC Role / Device Role / Timing Role: Stable 5.0 V reference for integrator ramp generator and ADC reference; TRIM pin used during factory calibration. Use Value: ±15 mV initial accuracy and 50 ppm long-term stability enable 4½-digit accuracy without annual recalibration. |
| Military Avionics Sensors | Medical Diagnostic Equipment |
Use Scenario: MEMS gyroscope signal conditioning board in UAV flight control unit, operating from 28 V aircraft bus. IC Role / Device Role / Timing Role: Reference for low-noise PGA and 20-bit SAR ADC; TEMP pin monitors die temperature for real-time gain compensation. Use Value: 15 µVp-p (0.1–10 Hz) noise floor ensures <1 LSB noise contribution in 20-bit conversion at 100 kSPS. |
Use Scenario: Ultrasound beamformer front-end requiring matched channel gain with sub-0.01% tracking. IC Role / Device Role / Timing Role: Master reference for 12-channel programmable gain amplifier array; SOIC package enables compact layout near ASIC. Use Value: 10 mA drive capability powers all 12 PGA reference inputs simultaneously without droop or cross-talk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR02ARZ | 5.0 V, ±0.1% initial accuracy, 3 ppm/°C max tempco, SOIC-8, 0.9 mA quiescent current - higher accuracy but lower drive (5 mA). | Used where ultra-low drift dominates over load drive; unsuitable for >5 mA reference loads without buffering. | Select ADR02ARZ when long-term stability (<2 ppm/1000 hrs) and tighter tempco are required, and load current ≤5 mA. |
| LT1021DCN8-5 | 5.0 V, ±0.05% initial accuracy, 2 ppm/°C max tempco, 8-lead PDIP, 1.2 mA IQ - superior specs but obsolete packaging and no TEMP pin. | Legacy repair or military 883B-compliant designs only; lacks integrated temperature sensing and modern SOIC footprint. | Choose LT1021DCN8-5 only for drop-in replacement in existing PDIP-based designs requiring highest-grade metrology performance. |
Compared with REF02CS, ADR02ARZ offers better accuracy and stability but halves load drive; LT1021DCN8-5 delivers metrology-grade performance in obsolete PDIP, sacrificing TEMP functionality and SOIC compatibility - REF02CS balances precision, integration, and manufacturability for new industrial designs.
Availability
REF02CS is available at Aetrix Electronics and suitable for industrial process control systems, precision data acquisition modules, and medical diagnostic equipment requiring stable component supply with guaranteed long-term continuity.
Supply support for REF02CS 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 REF01/REF02/REF03 series was designed for high-accuracy, low-drift voltage referencing in data converters, precision instrumentation, and aerospace-grade systems - prioritizing stability over speed or integration density.
FAQ
What is the maximum ambient temperature range supported by the REF02CS?
The REF02CS (SOIC package, S-suffix) is rated for operation from −40°C to +85°C. This range applies to C-grade devices; A/E-grade versions support −55°C to +125°C but are not offered in SOIC packaging. Always verify grade suffix (e.g., REF02CS is C-grade) against the ordering guide.
Can the REF02CS drive a 10 kΩ load directly without external buffering?
Yes, the REF02CS can drive a 10 kΩ load directly: at 5.0 V output, this draws 0.5 mA - well within its 10 mA sourcing capability. Load regulation remains ≤100 ppm/mA, contributing <0.05 mV error. For loads <1 kΩ or dynamic current steps, add a 0.1 µF ceramic capacitor at VOUT.
How is the TEMP pin used for temperature measurement in the REF02CS?
The TEMP pin outputs 580 mV at 25°C with a linear 1.96 mV/°C coefficient. To measure die temperature, connect TEMP to a high-impedance ADC input (≥1 MΩ), then compute T(°C) = (VTEMP − 0.580) / 0.00196. No calibration is needed beyond ADC offset/gain correction.
Does the REF02CS require input or output capacitors for stable operation?
The REF02CS is internally compensated and operates stably without external capacitors. However, a 0.1 µF ceramic capacitor at VOUT is highly recommended to reduce 0.1–10 Hz noise by >10 dB; a 1–10 µF bulk capacitor improves transient response. Input capacitance is optional but advised for noisy rails.
What is the purpose of the TRIM pin on the REF02CS, and how is it implemented?
The TRIM pin allows ±3.0% adjustment of the 5.0 V output using a 10 kΩ potentiometer between VOUT and TRIM, with wiper grounded. This enables fine-tuning to compensate for system-level errors like PCB trace resistance or solder thermal shift - no firmware or hardware redesign required.
REF02CS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- REF02
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 65ppm/°C
- Noise - 0.1Hz to 10Hz:
- 15µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 8V ~ 36V
- Current - Supply:
- 1.6mA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
REF02CS FAQ
1.How can I place an order for REF02CS through Aetrix?
Please submit a Request for Quotation (RFQ) for REF02CS 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 REF02CS reliable?
The price and inventory of REF02CS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF02CS is usually 5 days.
3.What payment methods are accepted for REF02CS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF02CS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF02CS?
REF02CS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF02CS 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 REF02CS?
For technical support, including REF02CS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF02CS requirements.
6.How does Aetrix verify that REF02CS is sourced from the original manufacturer or authorized distributors?
All REF02CS 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 REF02CS meets industry standards.
7.What is the process for return or replacement of REF02CS?
All REF02CS units undergo pre-shipment inspection (PSI). If there is an issue with REF02CS, 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 REF02CS part is unused and in its original packaging.
Return procedure for REF02CS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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