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Analog Devices Inc. AD780CRZ-REEL7
- Part No.:
- AD780CRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD780CRZ-REEL7.pdf
- Description:
- IC VREF SERIES 0.06%/0.17% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,418
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Product details
Overview
AD780CRZ-REEL7 from Analog Devices is a high-precision, pin-programmable 2.5 V or 3.0 V voltage reference IC designed for ADC/DAC biasing and precision analog systems. It delivers ±1 mV initial accuracy, ultralow 3 ppm/°C max drift over −40°C to +85°C, 100 nV/√Hz wideband noise, and supports series/shunt mode operation up to ±10 mA load. It is used in high-resolution data acquisition systems requiring stable, low-noise reference voltage.
For engineers reviewing the AD780CRZ-REEL7 datasheet, AD780CRZ-REEL7 pinout, AD780CRZ-REEL7 application, or AD780CRZ-REEL7 equivalent, key selection criteria include output stability under capacitive loads, temperature coefficient performance across industrial temperature range, trim capability for system-level calibration, and compatibility with 5 V supply-limited high-resolution converters such as AD7710 and AD7884.
Technical Context
The AD780CRZ-REEL7 implements a laser-trimmed band gap core with PTAT current generation and VBE compensation to achieve stable output over temperature. Its low-headroom amplifier enables 3.0 V output from as low as 4.5 V input, extending dynamic range in 5 V ADC systems without external buffering.
It features dual-mode operation: series mode (sourcing/sinking up to ±10 mA) and shunt mode (supporting negative reference generation), plus a dedicated TEMP pin delivering 560 mV at 25°C with 1.9 mV/°C sensitivity - enabling simultaneous reference and temperature sensing without added components.
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 direct compatibility with 16-bit+ ADC full-scale ranges. |
| Tempco | 3 ppm/°C max (−40°C to +85°C) - guarantees ≤±0.25 mV total drift across industrial range, critical for metrology-grade accuracy. |
| Noise Density | 100 nV/√Hz (100 Hz) - enables sub-LSB noise floor in 16-bit systems without external filtering. |
| Quiescent Current | 1.0 mA max at 25°C - supports low-power precision systems while maintaining stability under all load conditions. |
| Load Regulation | 75 µV/mA (series mode, sourcing) - maintains <0.0075% output shift per mA load change, essential for varying DAC loads. |
| TEMP Pin Output | 560 mV ±60 mV @ 25°C, 1.9 mV/°C - provides calibrated temperature transduction with <±0.5°C resolution when buffered. |
| Long-Term Stability | 20 ppm/1000 hr noncumulative - ensures predictable aging behavior in deployed instrumentation systems. |
Pinout & Package
AD780CRZ-REEL7 is housed in an 8-lead SOIC_N (R-8) package, RoHS-compliant, with standard JEDEC footprint and 160°C/W θJA. Thermal design must account for PCB copper area and airflow due to power dissipation limits (500 mW at 25°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Positive Supply Input | Accepts 4.0 V to 36 V; enables 3.0 V output from 4.5 V supply - critical for 5 V system headroom optimization. |
| 2 (GND) | Ground Reference | Common return for output, TEMP, and TRIM; must be low-impedance to avoid noise coupling into reference path. |
| 3 (TEMP) | Temperature Sensor Output | Provides linear 1.9 mV/°C signal; requires op-amp buffering (e.g., AD820) to prevent >100 µV VOUT error from loading. |
| 4 (OUT) | Reference Voltage Output | Delivers 2.5 V or 3.0 V; stable into any capacitance - eliminates need for external isolation buffers in ADC designs. |
| 5 (TRIM) | Fine Adjustment Terminal | Accepts external potentiometer for ±4% output trim; enables system-level calibration without replacing reference IC. |
| 6 (NC) | No Connect | Internally unused; must remain unconnected to avoid parasitic coupling or latch-up risk. |
| 7 (DNC) | Factory Test Terminal | 20 kΩ resistor to VIN; not for user circuitry - differs from LT1019 Pin 7 heater function. |
| 8 (SEL) | Output Voltage Select | Grounded = 3.0 V; open = 2.5 V - enables single-BOM flexibility across multiple reference voltage requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-programmable output | Single SEL pin selects 2.5 V or 3.0 V - eliminates BOM variants and simplifies layout reuse across product families. |
| Noise reduction architecture | Supports C1 (output-to-GND) and C2 (TEMP-to-GND) capacitors to reduce 0.1–10 Hz noise to 4 µV p-p - improves effective resolution in slow-sampling applications. |
| Stable under all capacitive loads | No external compensation required up to unlimited capacitance - removes design uncertainty in ADC reference decoupling and long-trace routing. |
| Series/shunt dual-mode operation | Configurable as positive or negative reference (e.g., −2.5 V) without external active components - reduces bill-of-materials in bipolar signal chains. |
| Integrated temperature transducer | On-chip TEMP pin delivers factory-calibrated 1.9 mV/°C output - enables real-time thermal compensation of sensor gain/offset without discrete thermistor networks. |
| Plug-in upgrade path | PIN-compatible replacement for AD680 and LT1019-2.5 - allows drop-in performance improvement in legacy designs without layout changes. |
Applications
| High-Resolution Data Acquisition | Precision Instrumentation Calibration |
|---|---|
Use Scenario: 16-bit ADC systems (e.g., AD7884) acquiring sensor signals in industrial PLCs with 5 V supply constraints. IC Role / Device Role / Timing Role: Primary voltage reference establishing full-scale input range and LSB weight for analog-to-digital conversion. Use Value: 3.0 V output extends ADC dynamic range by 20% vs. 2.5 V references, directly increasing measurement resolution without buffer amplifiers. |
Use Scenario: Portable multimeters and handheld calibrators requiring on-board self-calibration against internal temperature drift. IC Role / Device Role / Timing Role: Dual-function device providing both precision reference voltage and temperature-sensing signal for auto-compensation algorithms. Use Value: Eliminates separate temperature sensor and reference IC, reducing component count and board space while ensuring correlated thermal tracking. |
| Σ-Δ ADC Reference | Negative Reference Generation |
Use Scenario: High-accuracy weigh scales using AD7710/AD7712 Σ-Δ converters with external reference override capability. IC Role / Device Role / Timing Role: External reference source overriding internal 2.5 V bandgap to improve absolute accuracy and temperature stability. Use Value: Reduces total unadjusted error (TUE) by >50% compared to internal reference, meeting Class I metrology standards. |
Use Scenario: Bipolar front-end circuits (e.g., ±10 V input stages) needing precise −2.5 V reference for level-shifting and offset nulling. IC Role / Device Role / Timing Role: Shunt-mode configured reference generating stable negative voltage without op-amps or Zener diodes. Use Value: Enables true 2-terminal negative reference with <±1 mV accuracy and <3 ppm/°C drift - replaces discrete shunt regulator + op-amp combos. |
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; higher quiescent current (1.15 mA); no TEMP pin. | Lacks pin-selectable voltage and temperature sensing; optimized for ultra-low-drift, not multi-function use. | Select when only 2.5 V is needed and lowest possible tempco is prioritized over flexibility. |
| REF5025AIDR | Fixed 2.5 V; 3 ppm/°C max drift; 0.25 µV p-p (0.1–10 Hz) noise; no shunt mode or TEMP pin. | Superior low-frequency noise but no dual-mode operation or integrated temperature sensing. | Choose for ultra-low-noise 2.5 V reference in battery-powered portable instruments where TEMP functionality is unnecessary. |
Compared with ADR441BRZ and REF5025AIDR, the AD780CRZ-REEL7 uniquely combines pin-selectable output, shunt/series configurability, and integrated temperature transduction - making it the only option among the three suitable for systems requiring both precision reference and on-chip thermal monitoring without added components.
Availability
AD780CRZ-REEL7 is available at Aetrix Electronics and suitable for high-resolution data acquisition, precision instrumentation calibration, and Σ-Δ ADC reference applications requiring stable component supply across extended production lifecycles.
Supply support for AD780CRZ-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, serving industrial, automotive, communications, and healthcare markets.
The AD780CRZ-REEL7 belongs to Analog Devices' precision voltage reference product line, engineered specifically for metrology-grade accuracy, low-noise operation, and multi-function integration in high-resolution analog signal chains.
FAQ
What output voltage options does the AD780CRZ-REEL7 support, and how is selection implemented?
The AD780CRZ-REEL7 supports two precise output voltages: 2.5 V and 3.0 V. Selection is accomplished via Pin 8 (SEL): leaving it unconnected configures the device for 2.5 V output, while grounding it selects 3.0 V. This pin-programmable feature allows one AD780CRZ-REEL7 variant to serve multiple system voltage requirements without redesigning the schematic or layout.
How does the AD780CRZ-REEL7 achieve stability with large capacitive loads, and what is the maximum recommended value?
The AD780CRZ-REEL7 is internally compensated to remain stable under any capacitive load - including values exceeding 10 µF - without requiring external isolation resistors or damping networks. This is confirmed in the datasheet's "Stable under all load conditions" statement and verified by test data showing no oscillation or settling degradation even with unlimited capacitance, making it ideal for noisy industrial environments or long PCB traces.
Can the AD780CRZ-REEL7 generate a negative reference voltage, and if so, what configuration is required?
Yes, the AD780CRZ-REEL7 can generate a precise negative reference (e.g., −2.5 V) using shunt-mode configuration: connect VIN and OUT to ground, and tie the GND pin to a negative supply through a bias resistor. This eliminates the need for external op-amps or Zener diodes, enabling compact, accurate bipolar reference generation - as demonstrated in Figure 24 of the AD780 datasheet Rev. K.
What is the purpose and electrical behavior of the TEMP pin on the AD780CRZ-REEL7?
The TEMP pin (Pin 3) on the AD780CRZ-REEL7 provides a linear temperature-dependent voltage: 560 mV ±60 mV at 25°C with a sensitivity of 1.9 mV/°C. Because it draws current from the band gap core, loading this pin with >1 µA introduces measurable error in VOUT (e.g., 5.8 mV/µA for 2.5 V mode). Therefore, it must be buffered using a low-input-bias-current op-amp like AD820 before connection to ADC inputs.
Is the AD780CRZ-REEL7 a direct replacement for the AD680 or LT1019-2.5, and what advantages does it offer?
Yes, the AD780CRZ-REEL7 is explicitly specified as a pin-compatible performance upgrade for both the AD680 and LT1019(A)–2.5. It improves upon them with lower drift (3 ppm/°C vs. 10–20 ppm/°C), lower noise (100 nV/√Hz vs. ~200 nV/√Hz), and added functionality including pin-selectable output, TEMP pin, and shunt-mode operation - all while maintaining identical SOIC-8 footprint and pinout.
AD780CRZ-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:
- Active
- Reference Type:
- Series, Shunt
- Output Type:
- Programmable
- Voltage - Output (Min/Fixed):
- ±2.5V, ±3V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.06%, ±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
AD780CRZ-REEL7 FAQ
1.How can I place an order for AD780CRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD780CRZ-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 AD780CRZ-REEL7 reliable?
The price and inventory of AD780CRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD780CRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD780CRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD780CRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD780CRZ-REEL7?
AD780CRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD780CRZ-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 AD780CRZ-REEL7?
For technical support, including AD780CRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD780CRZ-REEL7 requirements.
6.How does Aetrix verify that AD780CRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD780CRZ-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 AD780CRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD780CRZ-REEL7?
All AD780CRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD780CRZ-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 AD780CRZ-REEL7 part is unused and in its original packaging.
Return procedure for AD780CRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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