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Analog Devices Inc. AD8021ARZ-REEL
- Part No.:
- AD8021ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8021ARZ-REEL.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:714
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Product details
Overview
AD8021ARZ-REEL from Analog Devices is a low-noise, high-speed voltage feedback operational amplifier optimized for 16-bit precision signal chains. It delivers 2.1 nV/√Hz input voltage noise, 205 MHz small-signal bandwidth at G = +2 (±5 V), and 0.01% settling in 23 ns - enabling high-fidelity ADC preamplification, ultrasound front-ends, and active filter stages in portable instrumentation.
For engineers reviewing the AD8021ARZ-REEL datasheet, AD8021ARZ-REEL pinout, AD8021ARZ-REEL application, or AD8021ARZ-REEL equivalent, key selection criteria include its custom-compensation capability (stable across G = −1 to −10), output disable feature (1.3 mA quiescent current), and SOIC-8 package compatibility with ±2.25 V to ±12 V dual-supply or 5 V single-supply operation.
Technical Context
The AD8021ARZ-REEL employs a voltage-feedback architecture with user-configurable CCOMP compensation to maintain constant bandwidth across gain settings from −1 to −10. Its internal biasing enables stable operation with low input offset drift (0.5 μV/°C) and minimal input bias current drift (10 nA/°C).
It integrates an active-low DISABLE pin referenced to LOGIC REFERENCE (Pin 1), enabling fast turn-on/turn-off times (45 ns / 50 ns) and >40 dB off-isolation at 10 MHz. The amplifier drives 75 Ω video lines with ±3 V signals and sustains linear output current up to 60 mA (±5 V) or 70 mA (±12 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 2.1 nV/√Hz @ 50 kHz - enables high-resolution sensor and ADC interface without degrading SNR. |
| −3 dB Bandwidth (G = +2) | 205 MHz typical (±5 V) - supports wideband signal conditioning for ultrasound and video. |
| Settling Time (0.01%) | 23 ns for 1 V step - meets timing requirements of 16-bit SAR and pipeline ADC drivers. |
| Quiescent Current | 7.7 mA enabled / 1.6 mA disabled (±5 V) - reduces power in battery-powered portable instruments. |
| Output Disable Threshold | 1.75 V (off) / 1.90 V (on) relative to LOGIC REFERENCE - ensures robust logic-level control with standard CMOS outputs. |
| Input Offset Voltage | 1.0 mV max - maintains DC accuracy in precision instrumentation preamps and active filters. |
| Capacitive Load Drive | 120 pF (30% overshoot, 1 V p-p) - allows direct connection to ADC input capacitance without external isolation. |
Pinout & Package
AD8021ARZ-REEL is supplied in an 8-lead SOIC (SOIC-8, R-8) package with exposed pad not present. Pin spacing is 1.27 mm, body width 3.9 mm, and total length 4.9 mm - compatible with standard PCB assembly processes and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LOGIC REFERENCE | Reference for DISABLE logic threshold | Must be tied to ground or logic low; defines enable/disable voltage window relative to Pin 8. |
| 2 −IN | Inverting input | High-impedance node (10 MΩ) with 1 pF common-mode capacitance; requires matched layout for optimal CMRR. |
| 3 +IN | Noninverting input | Same impedance and capacitance as −IN; differential input voltage limited to ±0.8 V to avoid diode conduction. |
| 4 −VS | Negative supply rail | Accepts −2.25 V to −12 V; decoupling capacitor required within 1 cm for stability. |
| 5 CCOMP | Compensation capacitor connection | Tied to −VS; value selected per gain (e.g., 7 pF for G = +2) to fix bandwidth without trade-off. |
| 6 VOUT | Amplifier output | Capable of ±3.2 V swing (±5 V supply); drives 150 Ω loads directly and 75 Ω video lines with NTSC compliance. |
| 7 +VS | Positive supply rail | Accepts +2.25 V to +12 V; PSRR >86 dB up to 100 kHz ensures immunity to supply ripple. |
| 8 DISABLE | Active-low output disable control | Pulled low ≤1.5 V below Pin 1 to disable; leakage <2 μA when high ensures minimal standby current. |
Key Features
| Feature | Design Value |
|---|---|
| Custom compensation | Single external capacitor (CCOMP) sets stable bandwidth across gains −1 to −10 without sacrificing speed. |
| Low-noise architecture | 2.1 nV/√Hz voltage noise + 2.1 pA/√Hz current noise enables high-gain, low-SNR degradation in sensor interfaces. |
| Output disable | Reduces quiescent current from 7.7 mA to 1.6 mA (±5 V), extending battery life in portable instrumentation. |
| Fast overload recovery | 50 ns recovery from ±2.5 V overdrive (G = +2) prevents signal distortion during transient events. |
| Wide supply range | Operates from ±2.25 V to ±12 V or single 5 V - simplifies power design across industrial, medical, and test equipment. |
Applications
| ADC Preamp & Driver | Ultrasound Signal Processing |
|---|---|
Use Scenario: Driving the analog input of a 16-bit, 1 MSPS SAR ADC in a portable data acquisition system. IC Role / Device Role / Timing Role: Precision gain stage with 0.01% settling in 23 ns and 2.1 nV/√Hz noise to preserve ENOB. Use Value: Maintains >94 dB SNR at full scale while supporting single-supply 5 V operation and low power budget. | Use Scenario: Amplifying low-amplitude echo signals from piezoelectric transducers in handheld ultrasound probes. IC Role / Device Role / Timing Role: Low-noise, wideband receiver front-end with 205 MHz bandwidth and 70 mA linear output drive. Use Value: Enables high-resolution B-mode imaging with minimal added noise floor and no gain-dependent bandwidth shift. |
| Active Filter Stage | Portable Instrumentation |
Use Scenario: Implementing a 4th-order Butterworth anti-aliasing filter before a high-speed ADC in spectral analysis equipment. IC Role / Device Role / Timing Role: Unity-gain stable op-amp with adjustable CCOMP to set precise cutoff frequency and phase response. Use Value: Delivers flat group delay and <0.03% differential gain/phase error for NTSC-compatible video filtering. | Use Scenario: Signal conditioning in handheld multimeters and portable oscilloscopes requiring battery efficiency and thermal stability. IC Role / Device Role / Timing Role: General-purpose gain block with 0.5 μV/°C offset drift and 1.3 mA disable current. Use Value: Ensures measurement repeatability across −40°C to +85°C while reducing idle power by >79% during sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4898-1ARMZ | Lower input voltage noise (1.0 nV/√Hz), higher quiescent current (18 mA), no disable pin | Better for ultra-low-noise DC-coupled sensor interfaces where power is secondary | Select ADA4898-1ARMZ only when sub-1.5 nV/√Hz noise is mandatory and disable functionality is unnecessary. |
| LMH6629MA/NOPB | Higher bandwidth (1.5 GHz), higher noise (2.9 nV/√Hz), no CCOMP pin, fixed compensation | Suitable for RF IF amplification above 100 MHz but less optimal for precision 16-bit ADC driving | Choose LMH6629MA/NOPB for GHz-range applications; avoid for 16-bit systems where noise and DC precision dominate. |
Compared with ADA4898-1ARMZ and LMH6629MA/NOPB, the AD8021ARZ-REEL uniquely balances 2.1 nV/√Hz noise, 205 MHz bandwidth, output disable, and user-adjustable compensation - making it the only option among the three qualified for portable 16-bit instrumentation requiring both precision and power-aware operation.
Availability
AD8021ARZ-REEL is available at Aetrix Electronics and suitable for portable instrumentation, ultrasound front-ends, and 16-bit data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD8021ARZ-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, headquartered in Norwood, MA.
The AD8021ARZ-REEL belongs to Analog Devices' precision high-speed amplifier product line, engineered specifically for 16-bit resolution signal chains where low noise, fast settling, and supply flexibility are critical.
FAQ
What is the maximum capacitive load the AD8021ARZ-REEL can drive while maintaining stability?
The AD8021ARZ-REEL can drive up to 120 pF with ≤30% overshoot when configured for 1 V p-p output (±5 V supply). This capability eliminates the need for external isolation resistors when interfacing directly with ADC input capacitance or long PCB traces, preserving signal integrity in high-speed data acquisition systems using the AD8021ARZ-REEL.
Does the AD8021ARZ-REEL support single-supply operation?
Yes, the AD8021ARZ-REEL operates from a single 5 V supply, with input common-mode voltage range from 0.9 V to 4.6 V and output swing from 1.10 V to 3.60 V. This enables use in battery-powered portable instrumentation without dual-rail generation, while maintaining 2.1 nV/√Hz noise and 190 MHz bandwidth - key performance attributes retained from dual-supply operation of the AD8021ARZ-REEL.
How does the CCOMP pin function in the AD8021ARZ-REEL?
The CCOMP pin (Pin 5) connects to an external capacitor tied to −VS, allowing users to set stable closed-loop bandwidth across gains from −1 to −10 without sacrificing speed. For example, 7 pF sets 205 MHz bandwidth at G = +2 (±5 V). This custom compensation avoids fixed-gain limitations and enables one AD8021ARZ-REEL design to serve multiple gain configurations in a single platform.
What is the purpose of the LOGIC REFERENCE pin on the AD8021ARZ-REEL?
The LOGIC REFERENCE pin (Pin 1) establishes the reference voltage for the DISABLE pin's logic threshold. When Pin 8 (DISABLE) is ≥1.75 V above Pin 1, the amplifier enables; when ≤1.5 V above, it disables. Tying Pin 1 to ground allows standard 0 V/5 V logic control. This architecture ensures reliable disable behavior across voltage rails and prevents false triggering - a critical feature for power-managed systems using the AD8021ARZ-REEL.
Is the AD8021ARZ-REEL suitable for driving 75 Ω video lines?
Yes, the AD8021ARZ-REEL is explicitly characterized to drive 75 Ω video lines with ±3 V signals, delivering 0.03% differential gain error and 0.04° differential phase error under NTSC conditions. Its 60 mA linear output current (±5 V) and 205 MHz bandwidth ensure full-spectrum fidelity for composite video, making it a validated solution for broadcast-quality signal routing and test equipment incorporating the AD8021ARZ-REEL.
AD8021ARZ-REEL 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:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 460V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 560 MHz
- Current - Input Bias:
- 7.5 µA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 7.8mA
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 24 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8021ARZ-REEL FAQ
1.How can I place an order for AD8021ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8021ARZ-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 AD8021ARZ-REEL reliable?
The price and inventory of AD8021ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8021ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD8021ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8021ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8021ARZ-REEL?
AD8021ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8021ARZ-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 AD8021ARZ-REEL?
For technical support, including AD8021ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8021ARZ-REEL requirements.
6.How does Aetrix verify that AD8021ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD8021ARZ-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 AD8021ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD8021ARZ-REEL?
All AD8021ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8021ARZ-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 AD8021ARZ-REEL part is unused and in its original packaging.
Return procedure for AD8021ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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