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Analog Devices Inc. AD780BR-REEL
- Part No.:
- AD780BR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD780BR-REEL.pdf
- Description:
- IC VREF SERIES 0.04%/0.03% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,535
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Product details
Overview
AD780BR-REEL from Analog Devices is a pin-programmable, ultrahigh-precision bandgap voltage reference delivering 2.5 V or 3.0 V output with ±1 mV max initial accuracy, 3 ppm/°C max drift (B-grade), 100 nV/√Hz wideband noise, and operation from 4.0 V to 36 V input. It serves as a stable reference for high-resolution ADCs/DACs in test equipment, precision data acquisition, and calibration systems.
For engineers reviewing the AD780BR-REEL datasheet, AD780BR-REEL pinout, AD780BR-REEL application, or AD780BR-REEL equivalent, key selection criteria include output stability over temperature, low-noise performance for sub-16-bit systems, series/shunt mode flexibility, temperature transducer capability, and compatibility with 5 V supply-limited high-dynamic-range converters.
Technical Context
The AD780BR-REEL implements a laser-trimmed bandgap core with two NPN transistors (12× emitter area ratio) generating a PTAT current across precision thin-film resistors, combined with Q7's VBE to yield a temperature-invariant Vbg. Its high-gain amplifier enables 3.0 V output from as low as 4.5 V input, supporting 20% increased ADC dynamic range versus legacy 2.5 V references.
It operates in series mode (sourcing/sinking up to ±10 mA) or shunt mode (±2.5 V/±3.0 V negative outputs without external components), with unconditional stability under all load conditions when using a 1 µF bypass capacitor. The TEMP pin provides a buffered 560 mV @ 25°C output with 1.9 mV/°C sensitivity and 3 kΩ output resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Pin-selectable 2.5 V or 3.0 V; enables single-BOM support for dual-voltage system calibration. |
| Initial Accuracy | ±1 mV max at 25°C; eliminates need for system-level trimming in metrology-grade instruments. |
| Temp Drift (B-grade) | 3 ppm/°C max (−40°C to +85°C); ensures ≤0.9 mV total variation across industrial temperature range. |
| Wideband Noise | 100 nV/√Hz typical; supports <18-bit ENOB in sigma-delta ADCs without external filtering. |
| Load Regulation | 50 µV/mA (series sourcing); maintains reference integrity during fast DAC settling or multiplexed sensor excitation. |
| Quiescent Current | 1.0 mA max (−40°C to +85°C); enables low-power portable precision measurement designs. |
| TEMP Pin Output | 500–620 mV @ 25°C, 1.9 mV/°C; allows integrated ambient temperature monitoring with <±0.5°C accuracy after op-amp buffering. |
Pinout & Package
AD780BR-REEL 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 regulator enables stable output even with 10% 5 V rail variation. |
| 2 (GND) | Ground Reference | Common return for output, TEMP, and TRIM; must be low-impedance for noise-sensitive applications. |
| 3 (TEMP) | Temperature Sensor Output | Linear 1.9 mV/°C output; requires op-amp buffer (e.g., AD820) to avoid >100 µV VOUT error from loading. |
| 4 (OUT) | Reference Voltage Output | 2.5 V or 3.0 V regulated output; drives ≥10 mA load directly; stable with any capacitive load ≥1 nF. |
| 5 (TRIM) | Fine-Adjustment Input | Accepts external potentiometer for ±4% trim range; enables system-level calibration without redesign. |
| 6 (NC) | No Connect | Internally unused; must remain floating per datasheet to prevent parametric shift. |
| 7 (DNC) | Production Test Terminal | 20 kΩ resistor to VIN; not for user circuitry-LT1019 pin-7 heater compatibility note applies only to legacy designs. |
| 8 (SEL) | Output Voltage Select | Ground = 3.0 V mode; open = 2.5 V mode; defines reference voltage without external logic or firmware. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable output | Hardware-selectable 2.5 V/3.0 V via SEL pin-no configuration registers or I²C interface required. |
| Ultralow drift (B-grade) | 3 ppm/°C max guarantees ≤0.9 mV total error across −40°C to +85°C-critical for unattended field instrumentation. |
| Noise reduction capability | External C1 (output-to-GND) and C2 (TEMP-to-GND) reduce 0.1–10 Hz noise to 4 µV p-p-enables high-resolution weigh-scale front-ends. |
| Series/shunt mode operation | Supports ±2.5 V/±3.0 V outputs without external components-reduces BOM count in bipolar signal chain designs. |
| Integrated temperature transducer | On-chip TEMP pin delivers calibrated 1.9 mV/°C output-eliminates discrete thermistor + ADC channel in environmental monitors. |
Applications
| High-Resolution Data Acquisition | Precision Calibration Equipment |
|---|---|
|
Use Scenario: 16-bit+ ADCs (e.g., AD7884, AD7712) in automated test systems requiring full-scale accuracy and repeatability. IC Role / Device Role / Timing Role: Primary voltage reference defining LSB size and absolute accuracy of digitized analog inputs. Use Value: 3.0 V output increases ADC dynamic range by 20% vs. 2.5 V references; low 100 nV/√Hz noise preserves ENOB at high sampling rates. |
Use Scenario: Portable calibrators for pressure, temperature, and flow transmitters needing traceable, field-stable references. IC Role / Device Role / Timing Role: Stable, low-drift reference source for zero/span adjustment and NIST-traceable verification. Use Value: ±1 mV initial accuracy and 3 ppm/°C drift ensure calibration validity over 12-month intervals without recalibration. |
| Bipolar Signal Conditioning | Embedded Temperature Monitoring |
|
Use Scenario: Industrial PLC analog I/O modules requiring ±2.5 V or ±3.0 V reference for bipolar DACs and sensor interfaces. IC Role / Device Role / Timing Role: Dual-polarity reference generator enabling true bipolar output without external op-amps or charge pumps. Use Value: Shunt-mode configuration produces −2.5 V/−3.0 V directly-reduces component count and improves thermal matching vs. discrete solutions. |
Use Scenario: Environmental sensors in medical devices or telecom infrastructure needing on-board ambient temperature compensation. IC Role / Device Role / Timing Role: Integrated temperature transducer providing linear 1.9 mV/°C output while maintaining primary reference stability. Use Value: Eliminates separate temperature sensor IC and associated signal conditioning-saves board space and reduces calibration complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR441BRZ | Fixed 2.5 V output; 1.5 ppm/°C max drift; 50 nV/√Hz noise; requires external trim for 3.0 V use. | Lacks pin-selectable voltage and TEMP pin; better for ultra-low-noise fixed-voltage systems only. | Select ADR441BRZ when lowest possible noise (50 nV/√Hz) and tightest drift (1.5 ppm/°C) are mandatory, and 2.5 V suffices. |
| REF5025AIDR | Fixed 2.5 V output; 3 ppm/°C max drift; 120 nV/√Hz noise; no temperature output pin; higher quiescent current (1.2 mA). | No voltage selection or TEMP functionality; optimized for high-PSRR, low-output-impedance applications. | Select REF5025AIDR when PSRR > 120 dB and output drive strength > 10 mA are required, and system design accommodates fixed 2.5 V. |
Compared with ADR441BRZ and REF5025AIDR, the AD780BR-REEL uniquely combines pin-selectable 2.5 V/3.0 V output, integrated temperature sensing, and shunt-mode bipolar capability-making it the only option for compact, multi-function reference subsystems where board space and feature integration are critical.
Availability
AD780BR-REEL is available at Aetrix Electronics and suitable for high-resolution data acquisition, precision calibration equipment, and bipolar signal conditioning requiring stable component supply, long-term parametric consistency, and RoHS-compliant packaging.
Supply support for AD780BR-REEL 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, serving industrial, communications, automotive, and healthcare markets since 1965.
The AD780 belongs to Analog Devices' precision voltage reference product line, engineered specifically for metrology-grade instrumentation, high-resolution data converters, and applications demanding sub-millivolt accuracy and ultralow thermal drift over extended temperature ranges.
FAQ
What output voltage options does the AD780BR-REEL support, and how is selection implemented?
The AD780BR-REEL supports 2.5 V and 3.0 V outputs selected solely by the state of Pin 8 (SEL): open-circuit yields 2.5 V, grounded yields 3.0 V. This hardware-based selection requires no external logic or firmware control, simplifying design and ensuring deterministic behavior across power cycles. The AD780BR-REEL maintains ±1 mV initial accuracy and 3 ppm/°C max drift in both modes, making it ideal for systems needing flexible reference voltage without rework.
How does the AD780BR-REEL achieve stability with large capacitive loads, and what is the recommended bypass capacitor?
The AD780BR-REEL features an internally compensated output stage that remains stable with any capacitive load, including >1 µF ceramic or tantalum capacitors-unlike many references requiring strict ESR or capacitance limits. A 1 µF bypass capacitor between VIN and GND is recommended when load capacitance exceeds 1 nF to suppress supply noise coupling. This robustness eliminates external isolation components in high-EMI environments like motor drives or switch-mode power supply monitoring.
Can the AD780BR-REEL generate negative reference voltages, and what configuration is required?
Yes, the AD780BR-REEL can generate precise negative references in shunt mode: connect VIN and OUT to ground, then tie the AD780BR-REEL's GND pin to a negative supply (e.g., −5 V) via a bias resistor. This configuration delivers stable −2.5 V or −3.0 V outputs without external op-amps or charge pumps. The AD780BR-REEL sustains ±10 mA output current in this mode, supporting bipolar DACs and differential sensor interfaces in compact industrial modules.
What is the function and accuracy of the TEMP pin on the AD780BR-REEL, and how should it be used?
The TEMP pin (Pin 3) on the AD780BR-REEL provides a linear temperature-dependent voltage: 560 mV ±60 mV at 25°C with 1.9 mV/°C sensitivity and 3 kΩ output resistance. To avoid injecting error into VOUT (>100 µV per µA), the TEMP output must be buffered with a low-input-bias-current op-amp (e.g., AD820). When properly buffered, it enables ±0.5°C ambient temperature monitoring-adding calibration-aware functionality without extra ICs in portable test gear.
Does the AD780BR-REEL require external components for basic operation, and what is its minimum input voltage?
No external components are required for basic AD780BR-REEL operation: connect VIN (Pin 1) to 4.0–36 V, GND (Pin 2) to system ground, SEL (Pin 8) to select 2.5 V (open) or 3.0 V (grounded), and use OUT (Pin 4) as the reference. Its unique low-headroom design enables 3.0 V output from as low as 4.5 V input-providing 20% more ADC dynamic range than conventional 2.5 V references powered from 5 V rails-ideal for battery-powered precision instruments.
AD780BR-REEL 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-REEL FAQ
1.How can I place an order for AD780BR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD780BR-REEL 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-REEL reliable?
The price and inventory of AD780BR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD780BR-REEL is usually 5 days.
3.What payment methods are accepted for AD780BR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD780BR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD780BR-REEL?
AD780BR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD780BR-REEL 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-REEL?
For technical support, including AD780BR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD780BR-REEL requirements.
6.How does Aetrix verify that AD780BR-REEL is sourced from the original manufacturer or authorized distributors?
All AD780BR-REEL 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-REEL meets industry standards.
7.What is the process for return or replacement of AD780BR-REEL?
All AD780BR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD780BR-REEL, 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-REEL part is unused and in its original packaging.
Return procedure for AD780BR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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