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Analog Devices Inc. AD780BR-REEL7
- Part No.:
- AD780BR-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD780BR-REEL7.pdf
- Description:
- IC VREF SERIES 0.04%/0.03% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,141
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Product details
Overview
AD780BR-REEL7 from Analog Devices is a pin-programmable, ultrahigh-precision band gap voltage reference delivering 2.5 V or 3.0 V output with ±1 mV max initial accuracy, 3 ppm/°C max drift (−40°C to +85°C), 100 nV/√Hz wideband noise, and 1 mA max quiescent current. It operates from 4.0 V to 36 V input and supports series/shunt mode for ±2.5 V or ±3.0 V outputs - enabling direct use in high-resolution ADC/DAC reference circuits without external buffers.
For engineers reviewing the AD780BR-REEL7 datasheet, AD780BR-REEL7 pinout, AD780BR-REEL7 application, or AD780BR-REEL7 equivalent, key selection criteria include its low-drift stability over temperature, dual-output voltage flexibility, integrated temperature-sensing capability, noise-reduction capacitor support, and compatibility with precision data converters such as the AD7710 and AD7884.
Technical Context
The AD780BR-REEL7 implements a laser-trimmed band gap core with two NPN transistors (Q6/Q7) differing 12× in emitter area to generate a PTAT current, combined with Q7's VBE to yield a stable VBG. Its high-gain amplifier features low headroom design, enabling 3.0 V output from a 4.5 V supply and supporting shunt-mode operation by sinking up to 10 mA.
A dedicated TEMP pin (Pin 3) provides a linear 560 mV @ 25°C output with 1.9 mV/°C sensitivity and 3 kΩ output resistance - usable as a system temperature transducer while maintaining reference stability. The TRIM pin enables ±4% fine adjustment of output voltage via external resistor networks without degrading long-term drift beyond 0.06 ppm/°C when properly implemented.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Pin-selectable 2.5 V or 3.0 V; ±1 mV max initial error ensures <0.04% absolute accuracy at 25°C. |
| Tempco | 3 ppm/°C max (−40°C to +85°C); guarantees ≤0.9 mV total variation across industrial range for AD780BR grade. |
| Noise Density | 100 nV/√Hz typical (100 Hz); enables sub-16-bit noise floor in high-resolution ADCs without external filtering. |
| Quiescent Current | 1 mA max at −40°C to +85°C; allows low-power precision reference in battery-backed or energy-constrained systems. |
| Load Regulation | 50 µV/mA sourcing (series mode); maintains <0.005% output shift per mA load change - critical for dynamic DAC loads. |
| TEMP Pin Output | 560 mV @ 25°C ±60 mV; 1.9 mV/°C linear slope enables calibrated ambient sensing with <±0.5°C resolution. |
| Long-Term Stability | 20 ppm/1000 hr noncumulative; ensures <0.02% drift over first 1000 hours - suitable for metrology-grade calibration equipment. |
Pinout & Package
AD780BR-REEL7 is housed in an 8-lead SOIC_N (R-8) package with standard JEDEC outline, 1.27 mm pitch, and 5.0 mm × 6.2 mm footprint. Thermal resistance θJA = 160°C/W under standard PCB conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Positive Supply Input | Accepts 4.0 V to 36 V; internal protection allows indefinite short to ground and momentary short to VIN. |
| 2 (VOUT) | Main Reference Output | Delivers 2.5 V or 3.0 V; capable of sourcing/sinking ±10 mA; stable with any capacitive load ≥1 nF. |
| 3 (TEMP) | Temperature Sensor Output | 560 mV @ 25°C, 1.9 mV/°C; requires op-amp buffering (e.g., OP07) to avoid >100 µV VOUT perturbation. |
| 4 (GND) | Analog Ground Reference | Common return for VIN, VOUT, TEMP, TRIM; must be low-impedance node to preserve noise performance. |
| 5 (TRIM) | Fine-Adjustment Interface | Supports ±4% output trim via external potentiometer; adds <0.06 ppm/°C drift when using 100 ppm/°C resistors. |
| 6 (NC) | No Connect | Internally unused; must remain unconnected per datasheet - no tie-to-ground or pull-up allowed. |
| 7 (DNC) | Production Test Terminal | 20 kΩ resistor to VIN; not for user circuitry - differs functionally from LT1019 Pin 7 self-heater connection. |
| 8 (SEL) | Output Voltage Select | Grounded → 3.0 V mode; open → 2.5 V mode; defines feedback ratio in internal amplifier 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 layout reuse across reference-voltage requirements. |
| Ultralow drift architecture | Laser-trimmed thin-film resistors and patented circuit techniques achieve 3 ppm/°C max - outperforms legacy references like AD680 by >2×. |
| Noise reduction capability | External C1 (output-to-GND) and C2 (TEMP-to-GND) reduce 0.1–10 Hz noise from 4 µV p-p to <1 µV p-p - essential for 24-bit Σ-Δ ADCs. |
| Integrated temperature transducer | TEMP pin delivers calibrated 1.9 mV/°C signal with <±0.5°C linearity - enables on-board thermal compensation without adding discrete sensors. |
| Shunt/series dual-mode operation | Operates as 2-terminal shunt regulator (e.g., −2.5 V) or 3-terminal series regulator - supports bipolar reference generation without external op-amps or passives. |
Applications
| High-Resolution Data Acquisition | Precision Instrumentation Calibration |
|---|---|
|
Use Scenario: 16-bit ADC sampling in portable multimeters and automated test equipment requiring stable full-scale reference under varying supply and temperature. IC Role / Device Role / Timing Role: Primary voltage reference for AD7884 and similar SAR ADCs; supplies precise 3.0 V reference to maximize dynamic range without buffer amplifiers. Use Value: Enables 3.0 V reference from 5 V supply with 0.04% initial error and <0.9 mV total drift - eliminating need for external trimming or recalibration across −40°C to +85°C. |
Use Scenario: Front-end signal conditioning in benchtop DMMs and calibration standards where traceable accuracy and long-term stability are mandatory. IC Role / Device Role / Timing Role: Master reference source for auto-zeroing circuits and gain calibration loops; TEMP pin used to compensate offset drift vs. ambient temperature. Use Value: 20 ppm/1000 hr long-term stability and 3 ppm/°C tempco ensure <±0.01% reference error over 1-year field deployment without scheduled recalibration. |
| Industrial Process Control Sensors | Medical Imaging Signal Chain |
|
Use Scenario: Analog front-end for 4–20 mA transmitter modules in hazardous environments where supply voltage varies widely (e.g., 12–36 V DC). IC Role / Device Role / Timing Role: Series-mode reference providing 2.5 V for sensor excitation and ADC conversion; operates stably across full 4–36 V input range with <10 µV/V line regulation. Use Value: Maintains <0.001% output variation despite ±10% supply ripple - ensuring consistent sensor measurement accuracy regardless of field wiring losses or power supply quality. |
Use Scenario: Reference for CT/MRI analog signal chains where ultra-low noise and EMI immunity are critical to image SNR. IC Role / Device Role / Timing Role: Low-noise 2.5 V reference for AD7710 Σ-Δ ADCs; C1/C2 capacitors suppress switching noise from nearby digital subsystems. Use Value: 100 nV/√Hz noise density and 4 µV p-p (0.1–10 Hz) enable <110 dB SNR in medical-grade digitization - exceeding IEC 62304 Class C safety-critical requirements. |
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 only; 10 ppm/°C max drift (−40°C to +85°C); higher 20 µV p-p (0.1–10 Hz) noise. | Lacks pin-selectable voltage, TEMP output, and shunt-mode capability - limited to unipolar, fixed-voltage use cases. | Choose when cost sensitivity outweighs drift/noise requirements and 2.5 V only is acceptable. |
| ADR441BRZ | Fixed 2.5 V output; 3 ppm/°C max drift; lower 50 nV/√Hz noise but no TEMP pin or voltage select. | Superior noise performance but no temperature monitoring or dual-voltage flexibility - unsuitable for transducer-integrated designs. | Prefer for ultra-low-noise 2.5 V-only applications where board space permits separate temperature sensing. |
Compared with LT1019AIS8-2.5#PBF and ADR441BRZ, AD780BR-REEL7 uniquely combines pin-selectable voltage, integrated temperature sensing, shunt/series dual-mode operation, and 3 ppm/°C drift - making it the only option among the three that supports both precision reference and system-level thermal management in a single device.
Availability
AD780BR-REEL7 is available at Aetrix Electronics and suitable for high-resolution data acquisition, precision instrumentation calibration, and industrial process control applications requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for AD780BR-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 operation in demanding data converter and calibration applications.
FAQ
What output voltage options does the AD780BR-REEL7 support, and how are they selected?
The AD780BR-REEL7 supports 2.5 V and 3.0 V outputs selected via the SEL pin (Pin 8): leaving it unconnected configures 2.5 V mode, while grounding it selects 3.0 V mode. This pin-programmable feature eliminates the need for separate part numbers and enables flexible design reuse. Both outputs maintain ±1 mV max initial accuracy and 3 ppm/°C max drift over −40°C to +85°C. The AD780BR-REEL7 achieves this through laser-trimmed feedback resistors internal to its high-gain amplifier stage.
How does the TEMP pin on the AD780BR-REEL7 function, and what design precautions are required?
The TEMP pin (Pin 3) on the AD780BR-REEL7 provides a linear voltage output of 560 mV at 25°C with a sensitivity of 1.9 mV/°C, derived directly from the band gap core. Because current drawn from this pin affects 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 the OP07 or AD820. Unbuffered loading causes measurable reference degradation - even 10 µA draw introduces >50 µV error in VOUT. The AD780BR-REEL7 datasheet specifies 3 kΩ output resistance at the TEMP pin.
Can the AD780BR-REEL7 operate in shunt mode, and what configurations enable negative reference generation?
Yes, the AD780BR-REEL7 supports shunt-mode operation by connecting VIN and VOUT to ground and biasing the GND pin to a negative supply - enabling direct −2.5 V or −3.0 V reference generation without external components. In series mode, it can sink up to 10 mA, allowing high-current negative references using bootstrap circuits. Unlike many references, the AD780BR-REEL7 has no region of instability and remains stable under all load conditions when a 1 µF bypass capacitor is used on VIN. This dual-mode capability is explicitly validated in the AD780BR-REEL7 datasheet Figures 24 and 25.
What noise reduction techniques are supported by the AD780BR-REEL7, and how effective are they?
The AD780BR-REEL7 supports external noise reduction using two capacitors: C1 (10–100 µF) between VOUT and GND, and C2 (10–100 nF) between TEMP and GND. With C1 = 100 µF and C2 = 100 nF, 0.1–10 Hz noise drops from 4 µV p-p to <1 µV p-p - a >3× improvement. Wideband spectral density remains at 100 nV/√Hz. These capacitors also improve transient settling time under dynamic loads. The AD780BR-REEL7 datasheet confirms this performance in Figure 10 and recommends avoiding intermediate C2 values to prevent oscillation.
Is the AD780BR-REEL7 pin-compatible with other voltage references, and which legacy parts does it upgrade?
Yes, the AD780BR-REEL7 is a pin-compatible performance upgrade for the LT1019A–2.5 and AD680, sharing identical 8-lead SOIC_N (R-8) pinout and footprint. It improves upon the LT1019A–2.5 with 3× lower drift (3 vs. 10 ppm/°C), 2× lower noise (100 vs. 200 nV/√Hz), and adds features including voltage select, TEMP output, and shunt-mode operation. The AD780BR-REEL7 datasheet explicitly states this compatibility in the General Description and Product Highlights sections.
AD780BR-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:
- ±0.04%, ±0.03%
- Temperature Coefficient:
- 3ppm/°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
AD780BR-REEL7 FAQ
1.How can I place an order for AD780BR-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD780BR-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 AD780BR-REEL7 reliable?
The price and inventory of AD780BR-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD780BR-REEL7 is usually 5 days.
3.What payment methods are accepted for AD780BR-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD780BR-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD780BR-REEL7?
AD780BR-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD780BR-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 AD780BR-REEL7?
For technical support, including AD780BR-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD780BR-REEL7 requirements.
6.How does Aetrix verify that AD780BR-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD780BR-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 AD780BR-REEL7 meets industry standards.
7.What is the process for return or replacement of AD780BR-REEL7?
All AD780BR-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD780BR-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 AD780BR-REEL7 part is unused and in its original packaging.
Return procedure for AD780BR-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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