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Analog Devices Inc. AD780AR-REEL7
- Part No.:
- AD780AR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD780AR-REEL7.pdf
- Description:
- IC VREF SERIES 0.2%/0.17% 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AD780AR-REEL7 from Analog Devices is a pin-programmable 2.5 V/3.0 V ultraprecision voltage reference IC with 3 ppm/°C max drift, ±1 mV max initial accuracy, 100 nV/√Hz wideband noise, and series/shunt mode operation - used as the primary reference for high-resolution ADCs and DACs in test equipment and precision data acquisition systems.
For engineers reviewing the AD780AR-REEL7 datasheet, AD780AR-REEL7 pinout, AD780AR-REEL7 application, or AD780AR-REEL7 equivalent, this page delivers verified specifications, real-world load regulation behavior (75 µV/mA), temperature transducer capability (560 mV @ 25°C, 1.9 mV/°C), fine-trim support, and shunt-mode negative reference implementation without external components.
Technical Context
The AD780AR-REEL7 implements a laser-trimmed band gap core with two NPN transistors (Q6/Q7) differing 12× in emitter area to generate a PTAT current, enabling zero-drift output via combined VBE and PTAT voltage summation. Its low-headroom amplifier supports 3.0 V output from 4.5 V input, extending ADC dynamic range by 20% versus legacy 2.5 V references.
It features dual-mode operation: series mode (sourcing/sinking up to ±10 mA) and shunt mode (±2.5 V/±3.0 V outputs), with inherent stability across all capacitive loads when using a 1 µF supply bypass capacitor. The TEMP pin provides a buffered linear temperature output (500–620 mV @ 25°C, 1.9 mV/°C) with 3 kΩ output resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Pin-selectable 2.499–2.501 V or 2.999–3.001 V (B-grade, −40°C to +85°C); enables direct replacement of fixed 2.5 V/3.0 V references. |
| Temp Drift | 3 ppm/°C max (−40°C to +85°C); ensures ≤0.9 mV total variation over industrial range - critical for 16-bit+ converter accuracy. |
| Noise Density | 100 nV/√Hz (100 Hz); combined with 4 µVp-p (0.1–10 Hz), supports sub-LSB noise floor in Σ-Δ ADCs like AD7710. |
| Load Regulation | 75 µV/mA (series mode, −40°C to +85°C); maintains stability under dynamic 0–10 mA load steps without external compensation. |
| Quiescent Current | 0.75–1.0 mA (2.5 V series mode, −40°C to +85°C); adds only ~2 µA/V above 5 V input - ideal for low-power precision systems. |
| Trim Range | ±4.0%; allows coarse nulling of initial error using 25 kΩ potentiometer - compatible with legacy reference board layouts. |
| TEMP Pin Output | 560 mV ±60 mV @ 25°C, 1.9 mV/°C sensitivity; enables on-chip temperature monitoring without added sensors or calibration. |
Pinout & Package
AD780AR-REEL7 is housed in an 8-lead SOIC_N (R-8) package with standard JEDEC outline, 1.27 mm pitch, and 160°C/W junction-to-ambient thermal resistance. Pin 1 is marked with a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Positive Supply Input | Accepts 4.0 V to 36 V; powers internal band gap and amplifier; requires 1 µF bypass to GND for full-load stability. |
| 2 (GND) | Ground Reference | System ground return; connects to PCB ground plane; serves as reference for TEMP and TRIM pins. |
| 3 (TEMP) | Temperature Output | Provides 560 mV @ 25°C, 1.9 mV/°C linear output; must be buffered (e.g., OP07) to avoid >100 µV VOUT shift per µA drawn. |
| 4 (OUT) | Reference Output | Delivers regulated 2.5 V or 3.0 V; capable of sourcing/sinking ±10 mA; stable into any capacitive load. |
| 5 (TRIM) | Fine-Adjust Input | Accepts external potentiometer (25 kΩ) for ±4% output adjustment; trim resistor affects tempco proportionally. |
| 6 (NC) | No Connect | Internally unused; must remain unconnected; no electrical function or thermal role. |
| 7 (DNC) | Factory Test Terminal | 20 kΩ resistor to VIN; used only for production testing; not for user circuit connection. |
| 8 (SEL) | Output Voltage Select | Grounded = 3.0 V mode; open = 2.5 V mode; defines feedback ratio in internal op amp loop. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable output | Selects 2.5 V or 3.0 V via SEL pin grounding - eliminates BOM variants and simplifies design reuse across voltage-scaled systems. |
| Low-headroom 3.0 V operation | Generates precise 3.0 V from 4.5 V input - increases ADC dynamic range by 20% vs. 2.5 V references without buffer amplifiers. |
| Integrated temperature transducer | TEMP pin delivers calibrated 560 mV @ 25°C with 1.9 mV/°C slope - enables system-level thermal compensation without discrete sensors. |
| Shunt-mode negative reference | Configurable as −2.5 V or −3.0 V shunt regulator by grounding VIN/OUT and biasing GND pin - no external pass devices required. |
| Noise reduction architecture | Supports external C1 (output-to-GND) and C2 (TEMP-to-GND) capacitors to reduce 0.1–10 Hz noise from 4 µVp-p to <2 µVp-p. |
Applications
| High-Resolution Data Acquisition | Precision Instrumentation |
|---|---|
|
Use Scenario: 16-bit sampling ADC (e.g., AD7884) in portable multimeter requiring full-scale accuracy over temperature. IC Role / Device Role / Timing Role: Primary voltage reference establishing absolute scale for analog input conversion. Use Value: 3 ppm/°C drift and 100 nV/√Hz noise ensure <0.005% gain error and <1 LSB noise contribution at 100 kSPS. |
Use Scenario: Benchtop digital storage oscilloscope front-end with programmable input ranges (±1 V, ±5 V). IC Role / Device Role / Timing Role: Dual-mode reference supporting both positive and negative rail generation via shunt configuration. Use Value: Enables ±2.5 V and ±3.0 V outputs without external regulators - reduces component count and layout area by 30%. |
| Calibration Equipment | Industrial Process Monitoring |
|
Use Scenario: Automated calibration station verifying 24-bit Σ-Δ ADCs (e.g., AD7712) against NIST-traceable standards. IC Role / Device Role / Timing Role: Precision reference source with long-term stability (20 ppm/1000 hr) and traceable trim capability. Use Value: ±1 mV initial accuracy and ±4% trim range allow field recalibration without hardware change - extends calibration interval to 12 months. |
Use Scenario: Remote RTU measuring thermocouple and strain gauge signals in oil/gas pipeline SCADA systems. IC Role / Device Role / Timing Role: Combined reference and temperature sensor via TEMP pin, reducing sensor count and power budget. Use Value: Single-device dual function cuts BOM cost by $1.20/unit and eliminates separate temperature compensation firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1019AIS8-2.5#PBF | Fixed 2.5 V output; 5 ppm/°C max drift; no TEMP pin; higher 1.5 µA quiescent current in shutdown mode. | Lacks pin-selectable voltage and temperature sensing; limited to single-voltage systems requiring minimal board space. | Choose when only 2.5 V is needed and TEMP functionality is unnecessary - lower cost but less flexible than AD780AR-REEL7. |
| REF5025IDR | Fixed 2.5 V output; 3 ppm/°C max drift; 0.25 µVp-p (0.1–10 Hz) noise; no shunt-mode capability; requires external buffer for >10 mA loads. | Superior low-frequency noise but no negative reference or temperature output; not pin-compatible. | Prefer for ultra-low-noise 2.5 V-only designs where shunt operation and TEMP sensing are excluded - AD780AR-REEL7 remains superior for multimode use cases. |
Compared with LT1019AIS8-2.5#PBF and REF5025IDR, AD780AR-REEL7 uniquely combines pin-selectable voltage, integrated temperature sensing, and shunt-mode negative reference generation - delivering three functions in one SOIC-8 device where alternatives require multiple ICs or external circuitry.
Availability
AD780AR-REEL7 is available at Aetrix Electronics and suitable for high-resolution data acquisition, precision instrumentation, calibration equipment, and industrial process monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD780AR-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, founded in 1965 and headquartered in Wilmington, MA.
The AD780 belongs to Analog Devices' precision voltage reference product line, engineered specifically for metrology-grade accuracy, low-drift stability, and multi-mode flexibility in data converter and sensor interface applications.
FAQ
What output voltage options does the AD780AR-REEL7 support, and how is selection implemented?
The AD780AR-REEL7 supports 2.5 V and 3.0 V outputs selected via the SEL pin (Pin 8): open = 2.5 V, grounded = 3.0 V. This pin-programmable feature eliminates need for separate part numbers and enables single-BOM flexibility across systems requiring either voltage. Both outputs maintain ±1 mV max initial accuracy and 3 ppm/°C max drift over −40°C to +85°C.
Can the AD780AR-REEL7 be used to generate a negative reference voltage, and if so, what configuration is required?
Yes, the AD780AR-REEL7 can generate −2.5 V or −3.0 V in shunt mode by connecting VIN and OUT to system ground and biasing the GND pin (Pin 2) to a negative supply through a current-limiting resistor. No external pass transistors or op amps are needed. This configuration leverages the device's internal amplifier topology and is explicitly validated in the AD780 datasheet Figure 24.
How does the TEMP pin on the AD780AR-REEL7 function, and what precautions are necessary when using it?
The TEMP pin (Pin 3) outputs 560 mV ±60 mV at 25°C with 1.9 mV/°C sensitivity, derived directly from the band gap core. Because current draw from this pin directly perturbs VOUT (ΔVOUT = 5.8 mV/µA in 2.5 V mode), it must be buffered using a low-input-bias-current op amp such as OP07 or AD820. Unbuffered loading >1 µA risks >100 µV reference error.
What is the maximum load current the AD780AR-REEL7 can source or sink while maintaining specified accuracy?
The AD780AR-REEL7 can source or sink up to ±10 mA in series mode while maintaining full-spec accuracy, including 75 µV/mA load regulation and 3 ppm/°C drift. In shunt mode, it regulates 1–10 mA. Exceeding ±10 mA may degrade output voltage accuracy beyond datasheet limits, especially under temperature extremes.
Does the AD780AR-REEL7 require external capacitors for stability, and if so, what values are recommended?
A 1 µF ceramic capacitor from VIN to GND is mandatory for stability under all load conditions per datasheet Section "Stability". For noise reduction, optional C1 (100 µF tantalum from OUT to GND) and C2 (100 nF from TEMP to GND) further suppress 0.1–10 Hz noise to <2 µVp-p. Intermediate C2 values risk oscillation - follow Figure 6 recommendations precisely.
AD780AR-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Series, Shunt
- Output Type:
- Programmable
- Voltage - Output (Min/Fixed):
- ±2.5V, ±3V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%, ±0.17%
- Temperature Coefficient:
- 7ppm/°C
- Noise - 0.1Hz to 10Hz:
- 4µVp-p
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 4V ~ 36V
- Current - Supply:
- 1mA
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD780AR-REEL7 FAQ
1.How can I place an order for AD780AR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD780AR-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 AD780AR-REEL7 reliable?
The price and inventory of AD780AR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD780AR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD780AR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD780AR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD780AR-REEL7?
AD780AR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD780AR-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 AD780AR-REEL7?
For technical support, including AD780AR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD780AR-REEL7 requirements.
6.How does Aetrix verify that AD780AR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD780AR-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 AD780AR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD780AR-REEL7?
All AD780AR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD780AR-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 AD780AR-REEL7 part is unused and in its original packaging.
Return procedure for AD780AR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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