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Analog Devices Inc. AD820BRZ-REEL7
- Part No.:
- AD820BRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD820BRZ-REEL7.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:906
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Product details
Overview
AD820BRZ-REEL7 from Analog Devices is a precision FET-input operational amplifier optimized for single-supply, rail-to-rail output operation in low-power analog signal conditioning. It delivers 1.8 MHz unity-gain bandwidth, 3 V/μs slew rate, and 800 μA max quiescent current across ±2.5 V to ±15 V or +5 V to +30 V supplies, with input voltage range extending 0.2 V below negative rail. It is used in photodiode preamplifiers, battery-powered instrumentation, and 12–14-bit data acquisition front-ends.
For engineers reviewing the AD820BRZ-REEL7 datasheet, AD820BRZ-REEL7 pinout, AD820BRZ-REEL7 application, or AD820BRZ-REEL7 equivalent, key selection criteria include its FET-input bias current (<25 pA), rail-to-rail output swing (within 10 mV of rails), capacitive load drive capability (up to 350 pF), and guaranteed operation over −40°C to +85°C industrial temperature range.
Technical Context
The AD820BRZ-REEL7 employs an N-channel JFET input stage enabling ultra-low input bias current (≤25 pA) and high input impedance (1013 Ω || 2.8 pF), critical for high-impedance sensor interfaces like photodiodes. Its bipolar rail-to-rail output stage achieves <10 mV saturation voltage above positive rail and <5 mV below negative rail at light loads, supporting wide dynamic range in single-supply systems.
It maintains stable operation driving up to 350 pF directly without external compensation and sustains ≥15 mA output current while preserving dc precision-800 μV max input offset voltage, 2 μV/°C drift, and −93 dB THD at 10 kHz-making it suitable for precision active filters and low-noise reference buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | +5 V to +30 V single supply or ±2.5 V to ±15 V dual supply - enables direct integration into 5 V microcontroller-based systems and legacy ±15 V test equipment. |
| Input Bias Current | ≤25 pA max at 25°C - preserves signal integrity in high-Z sources (e.g., pH electrodes, piezoelectric sensors) without significant DC error. |
| Unity-Gain Bandwidth | 1.8 MHz - supports stable gain-of-1 buffering and low-pass filtering up to ~100 kHz with adequate phase margin. |
| Slew Rate | 3 V/μs - allows clean amplification of 10 kHz sine waves at 3 VPP without slew-induced distortion. |
| Output Swing | Within 10 mV of +VS and 5 mV of −VS (no load) - maximizes usable dynamic range in 3.3 V or 5 V systems. |
| Capacitive Load Drive | Up to 350 pF - eliminates need for isolation resistor when driving ADC input capacitance or long PCB traces. |
| Quiescent Current | 620–800 μA over temperature - balances performance and battery life in portable instrumentation. |
Pinout & Package
AD820BRZ-REEL7 is supplied in an 8-lead SOIC_N (Small Outline Integrated Circuit, narrow body) package, RoHS-compliant and tape-and-reel packaged per JEDEC standard MS-012AA. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard counter-clockwise orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected; must remain floating - no routing or grounding required. |
| 2 (−IN) | Inverting Input | High-impedance FET node; connects to feedback network in inverting configurations or sensor return paths. |
| 3 (+IN) | Non-Inverting Input | High-impedance FET node; accepts high-Z sensor signals (e.g., photodiode cathode) with minimal loading. |
| 4 (−VS) | Negative Supply Rail | Reference for internal biasing; tied to ground in single-supply mode or −VS in dual-rail systems. |
| 5 (NC) | No Connect | Internally unconnected; leave unconnected on PCB - no thermal or electrical function. |
| 6 (VOUT) | Amplifier Output | Class-AB rail-to-rail stage capable of sourcing/sinking ≥15 mA; drives ADC inputs, filters, or level-shifting networks directly. |
| 7 (+VS) | Positive Supply Rail | Primary power connection; supports operation up to +30 V - accommodates unregulated battery inputs or industrial rails. |
| 8 (NC) | No Connect | Internally unconnected; no PCB trace or via required - ensures mechanical compatibility with PDIP/MSOP footprints. |
Key Features
| Feature | Design Value |
|---|---|
| True single-supply operation | Input common-mode range extends 0.2 V below −VS and up to 1 V below +VS - enables ground-referenced sensor interfacing without level-shifting circuitry. |
| Rail-to-rail output swing | Output reaches within 5 mV of −VS and 10 mV of +VS at light loads - preserves >99% of available voltage headroom in 3.3 V systems. |
| FET input stage | Input bias current ≤25 pA and input impedance ≥1013 Ω - prevents signal attenuation and DC drift in high-impedance transducer circuits. |
| Low noise performance | 13 nV/√Hz @ 10 kHz and 2 μV p-p (0.1–10 Hz) - ensures minimal contribution to system noise floor in precision measurement front-ends. |
| Capacitive load stability | Stable with up to 350 pF directly on output - simplifies layout for ADC driver applications and eliminates need for series damping resistors. |
Applications
| Photodiode Preamp | Active Low-Pass Filter |
|---|---|
|
Use Scenario: Amplifying weak current from reverse-biased silicon photodiodes in optical smoke detectors or spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal input bias error and low noise. Use Value: 25 pA max input bias current avoids dark-current-induced offset; 13 nV/√Hz noise preserves SNR for sub-nA signals. |
Use Scenario: Implementing a 3-pole Sallen-Key low-pass filter in portable ECG monitors to suppress 50/60 Hz interference. IC Role / Device Role / Timing Role: Unity-gain buffer and gain-setting amplifier in second-order active filter topology. Use Value: 1.8 MHz GBW and 3 V/μs slew rate support stable 10 kHz cutoff with <0.1% passband ripple; rail-to-rail output maximizes ADC utilization. |
| Battery-Powered Instrumentation | Medical Sensor Interface |
|
Use Scenario: Signal conditioning in handheld multimeters or portable gas analyzers powered by two AA cells (3 V nominal). IC Role / Device Role / Timing Role: Precision DC-coupled amplifier for thermistor or strain gauge bridges operating from single 3.3 V supply. Use Value: 800 μA quiescent current extends battery life; input offset voltage ≤800 μV ensures <0.1% measurement error in 12-bit systems. |
Use Scenario: Front-end amplification for disposable blood glucose or pulse oximetry sensors requiring biocompatible, low-power analog stages. IC Role / Device Role / Timing Role: Low-noise, low-drift gain stage preceding sigma-delta ADC in Class II medical devices. Use Value: 2 μV/°C offset drift minimizes calibration frequency; −40°C to +85°C rating covers clinical and field-use environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC2272CDR | Lower GBW (2.2 MHz), higher IQ (1.1 mA), JFET input but higher input bias current (1 pA typ, 60 pA max) | Less suitable for ultra-high-Z photodiode nodes; better for general-purpose 5 V rail-to-rail buffering | Select when higher speed is needed and input bias <25 pA is not critical |
| OPA344UA | CMOS input (0.5 pA typ), lower noise (11 nV/√Hz), but limited supply (2.7–5.5 V) and lower output drive (8 mA) | Optimized for 3.3 V portable systems; insufficient for 12–14-bit DAQ requiring >15 mA drive | Select for battery-constrained 3.3 V designs where ultra-low IB and noise outweigh output current needs |
Compared with TLC2272CDR and OPA344UA, AD820BRZ-REEL7 uniquely combines FET-input picoampere bias, 15 mA output drive, and wide supply range (5–30 V), making it the only option among the three that supports both high-impedance sensing and robust load driving across industrial and medical single-supply platforms.
Availability
AD820BRZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode preamplifiers, and 12-bit to 14-bit data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD820BRZ-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, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD820BRZ-REEL7 belongs to Analog Devices' precision FET-input op amp family, engineered for low-power, single-supply signal conditioning in instrumentation, medical, and industrial sensing applications where input bias current and rail-to-rail output are critical.
FAQ
What is the maximum supply voltage for AD820BRZ-REEL7?
The AD820BRZ-REEL7 supports absolute maximum supply voltages of ±18 V or 36 V total differential, with recommended operating range of +5 V to +30 V (single supply) or ±2.5 V to ±15 V (dual supply). Exceeding ±18 V risks permanent damage per Absolute Maximum Ratings table in Rev. H datasheet.
Does AD820BRZ-REEL7 support true rail-to-rail input?
No, AD820BRZ-REEL7 does not feature rail-to-rail input. Its input common-mode voltage range extends 0.2 V below −VS and up to 1 V below +VS. Input voltages near +VS reduce bandwidth and increase common-mode error, as documented in Figure 20 and Applications Information section.
Can AD820BRZ-REEL7 drive an ADC input directly?
Yes, AD820BRZ-REEL7 can drive most SAR and sigma-delta ADC inputs directly due to its 350 pF capacitive load drive capability and 15 mA output current. Its rail-to-rail output swing ensures full-scale utilization of 3.3 V or 5 V ADC references without external level-shifting components.
What is the typical input offset voltage drift of AD820BRZ-REEL7?
The AD820BRZ-REEL7 has a typical input offset voltage drift of 2 μV/°C, with maximum drift specified as 2 μV/°C for both AD820A and AD820B grades across −40°C to +85°C. This low drift ensures stable DC accuracy in temperature-varying environments such as portable medical devices.
Is AD820BRZ-REEL7 pin-compatible with other SOIC-8 op amps?
AD820BRZ-REEL7 uses standard SOIC_N (narrow-body) 8-lead footprint (JEDEC MS-012AA), matching industry-standard SOIC-8 pitch (1.27 mm) and outline dimensions. However, pin functions differ from many voltage-feedback op amps - e.g., pins 1, 5, and 8 are NC, not shutdown or enable - so electrical compatibility must be verified per schematic.
AD820BRZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 1.9 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 700µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD820BRZ-REEL7 FAQ
1.How can I place an order for AD820BRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD820BRZ-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 AD820BRZ-REEL7 reliable?
The price and inventory of AD820BRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD820BRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD820BRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD820BRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD820BRZ-REEL7?
AD820BRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD820BRZ-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 AD820BRZ-REEL7?
For technical support, including AD820BRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD820BRZ-REEL7 requirements.
6.How does Aetrix verify that AD820BRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD820BRZ-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 AD820BRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD820BRZ-REEL7?
All AD820BRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD820BRZ-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 AD820BRZ-REEL7 part is unused and in its original packaging.
Return procedure for AD820BRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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