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Analog Devices Inc. AD589KH
- Part No.:
- AD589KH
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- TO-51-2 Metal Can
- Datasheet:
-
AD589KH.pdf
- Description:
- IC VREF SHUNT -2.83%/+1.22% TO51
- Quantity:
- Payment:
- Shipping:
Inventory:4,897
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Product details
Overview
AD589KH from Analog Devices is a 2-terminal shunt voltage reference delivering a precise 1.23 V output with ±0.025 V initial accuracy, 50 ppm/°C max temperature coefficient (0°C to +70°C), 0.6 Ω dynamic output impedance, and operation from 50 μA to 5 mA input current-used as a stable reference for CMOS ADCs and portable instrumentation.
For engineers reviewing the AD589KH datasheet, AD589KH pinout, AD589KH application, or AD589KH equivalent, this page provides verified specifications, metal-can package details, low-power design implications, and direct alternatives for precision analog signal chains requiring stable 1.2 V references.
Technical Context
The AD589KH operates as a bandgap-based 2-terminal shunt reference, not a series regulator or Zener diode. Its output voltage stability relies on matched on-chip bipolar components and thin-film trimming, enabling low TC without external compensation.
It supports bidirectional polarity use (positive/negative/floating reference), achieves 25 μs turn-on settling to 0.1%, and maintains full accuracy across load changes due to its 10× lower output impedance versus standard low-TC Zeners.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.235 V typical at 25°C; ±25 mV over grade (1.200–1.250 V), enabling direct replacement of legacy 1.2 V references with tighter tolerance. |
| Temp Coefficient | 50 ppm/°C max (0°C to +70°C); guarantees ≤±0.0037 V drift over full industrial range-critical for uncalibrated portable meters. |
| Operating Current | 50 μA to 5 mA; 60 μW power dissipation at 50 μA allows battery-life extension in always-on sensor nodes. |
| Dynamic Impedance | 0.6 Ω typical; ensures <1 mV load-induced error even with 1 mA step changes-no external capacitor needed for stability. |
| Noise (10 Hz–10 kHz) | 5 μV rms; low enough for 12-bit ADC reference without added filtering in precision data acquisition. |
| Settling Time | 25 μs to 0.1%; enables rapid power cycling in handheld test equipment without measurement delay penalties. |
Pinout & Package
AD589KH is housed in a hermetic metal can (TO-51 / H-02) package with two axial leads: anode and cathode. No polarity marking; functional symmetry allows either lead as input or output terminal depending on circuit configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current sink node in shunt configuration | Connected to load ground or negative rail when used as negative reference; defines current path direction. |
| Cathode | Reference voltage output node | Provides 1.23 V relative to anode; low-impedance source suitable for driving op-amp inputs or ADC reference pins directly. |
Key Features
| Feature | Design Value |
|---|---|
| 2-terminal shunt architecture | Eliminates need for dedicated supply rail or feedback network-reduces BOM count and PCB area in space-constrained designs. |
| 0.6 Ω dynamic output impedance | Enables stable regulation under varying load conditions without external compensation capacitors or ferrite beads. |
| Floating, bipolar, or ground-referenced operation | Supports single-supply systems, isolated sensor interfaces, and negative-reference DAC configurations without redesign. |
| 50 μA minimum operating current | Permits ultra-low-power wake-up circuits where reference must remain active during deep sleep modes of microcontrollers. |
| MIL-STD-883 compliance option | Available in AD589KH/883B variant for aerospace and defense applications requiring radiation-hardened qualification. |
Applications
| Portable Digital Multimeter | Battery-Powered Data Logger |
|---|---|
Use Scenario: Handheld DMM requiring stable 1.2 V reference for auto-ranging ADC and LCD bias generation. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling for dual-slope integrating ADC core. Use Value: 50 ppm/°C TC and 25 μs settling enable accurate measurements across 0–40°C ambient without calibration drift or warm-up delay. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 seconds using coin-cell power. IC Role / Device Role / Timing Role: Low-current reference for SAR ADC and microcontroller internal VREF input. Use Value: 60 μW dissipation at 50 μA extends 10-year battery life while maintaining 12-bit linearity over temperature. |
| CMOS ADC Reference | CMOS Multiplying DAC Reference |
Use Scenario: Industrial panel meter using AD7107 3.5-digit ADC in 4–20 mA loop-powered transmitter. IC Role / Device Role / Timing Role: Precision 1.23 V reference for ADC conversion reference and internal oscillator biasing. Use Value: Matched thermal tracking between on-die components minimizes gain error drift across 0–70°C operating range. |
Use Scenario: Programmable current source using AD7533 10-bit multiplying DAC with 0–10 V output range. IC Role / Device Role / Timing Role: Negative reference generator (−1.0 V equivalent) via floating connection to DAC's REF(–) pin. Use Value: Bidirectional polarity support eliminates need for additional inverting op-amp stage or dual-supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-terminal shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BZ-1.2 | 1.235 V nominal, 100 ppm/°C TC (0–70°C), 1.5 Ω output impedance, 10 μA min current | Higher TC and impedance limit use in high-accuracy portable instruments; better suited for cost-sensitive consumer electronics | Select LM385BZ-1.2 only if TC >50 ppm/°C and impedance >1 Ω are acceptable in final system error budget. |
| REF191GS | 1.25 V nominal, 20 ppm/°C TC (−40–+85°C), 3-terminal series topology, 60 μA quiescent current | Requires separate supply and ground pins; incompatible pinout and topology-cannot substitute without PCB revision | Choose REF191GS only when upgrading to higher-accuracy, wider-temp-range design with layout flexibility for 3-pin placement. |
Compared with LM385BZ-1.2 and REF191GS, the AD589KH uniquely combines 2-terminal simplicity, 50 ppm/°C TC, and sub-1 Ω impedance in a hermetic metal can-making it optimal for legacy-compatible, high-stability, low-power shunt reference upgrades.
Availability
AD589KH is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial panel meters requiring stable component supply with long-term obsolescence mitigation.
Supply support for AD589KH 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD589 family was designed specifically for precision, low-power, 2-terminal shunt voltage reference applications in portable test equipment, medical sensors, and industrial control systems where board space and power are constrained.
FAQ
What is the maximum operating current for AD589KH?
The AD589KH has an absolute maximum current rating of 10 mA per its Absolute Maximum Ratings table. However, optimal performance-including specified temperature coefficient and output voltage accuracy-is guaranteed only up to 5 mA. Operating beyond 5 mA may increase self-heating effects and degrade long-term stability, so AD589KH should be limited to ≤5 mA in production designs.
Does AD589KH require an external capacitor for stability?
No, AD589KH does not require frequency compensation or external capacitors to maintain stability. Its 0.6 Ω dynamic output impedance and internal bandgap architecture ensure unconditional stability across its full 50 μA–5 mA operating range. A 1000 pF capacitor is optional only for ultralow-noise applications-not for stability.
Can AD589KH be used as a negative reference?
Yes, AD589KH supports negative reference operation by reversing its terminal connections: connect the cathode to circuit ground and the anode to the negative supply rail. This configuration delivers −1.23 V at the cathode relative to system ground, enabling direct interfacing with CMOS multiplying DACs like the AD7533 without level-shifting circuitry.
What is the package type and lead finish for AD589KH?
AD589KH is supplied in a hermetic metal can package designated H-02 (TO-51), with two axial leads. The standard lead finish is tin-lead (SnPb); Pb-free variants are not offered for the H-02 package-only SOIC versions (e.g., AD589JRZ) carry RoHS-compliant terminations.
How does AD589KH compare to AD589MH in terms of temperature coefficient?
AD589KH specifies a maximum temperature coefficient of 50 ppm/°C over 0°C to +70°C, whereas AD589MH improves to 10 ppm/°C over the same range. Both share identical pinout, package, and electrical architecture-only the laser-trimmed bandgap element differs. AD589KH offers better cost/performance balance for industrial-grade applications where ±0.0037 V drift is acceptable.
AD589KH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- TO-51-2 Metal Can
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 5 mA
- Tolerance:
- -2.83%, +1.22%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 5µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 50 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-51-2
AD589KH FAQ
1.How can I place an order for AD589KH through Aetrix?
Please submit a Request for Quotation (RFQ) for AD589KH 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 AD589KH reliable?
The price and inventory of AD589KH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD589KH is usually 5 days.
3.What payment methods are accepted for AD589KH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD589KH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD589KH?
AD589KH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD589KH 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 AD589KH?
For technical support, including AD589KH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD589KH requirements.
6.How does Aetrix verify that AD589KH is sourced from the original manufacturer or authorized distributors?
All AD589KH 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 AD589KH meets industry standards.
7.What is the process for return or replacement of AD589KH?
All AD589KH units undergo pre-shipment inspection (PSI). If there is an issue with AD589KH, 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 AD589KH part is unused and in its original packaging.
Return procedure for AD589KH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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