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Analog Devices Inc. AD8021ARMZ-REEL
- Part No.:
- AD8021ARMZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8021ARMZ-REEL.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,295
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Product details
Overview
AD8021ARMZ-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 and ultrasound signal conditioning in portable instrumentation.
For engineers reviewing the AD8021ARMZ-REEL datasheet, AD8021ARMZ-REEL pinout, AD8021ARMZ-REEL application, or AD8021ARMZ-REEL equivalent, key selection criteria include its output disable feature (1.3 mA quiescent current), custom compensation via CCOMP pin, ±2.25 V to ±12 V supply flexibility, and MSOP-8 package suitability for space-constrained analog front-ends.
Technical Context
The AD8021ARMZ-REEL employs a voltage-feedback architecture with user-configurable gain-bandwidth trade-off via external CCOMP capacitor (pin 5), maintaining stable operation across gains of +1 to +10. Its dual-supply design supports ±2.25 V to ±12 V operation, and the active-low DISABLE pin (pin 8) enables fast turn-off (50 ns) with −40 dB off-isolation at 10 MHz.
It achieves low distortion (−93 dBc HD2, −108 dBc HD3 at 1 MHz) and wide input common-mode range (−4.1 V to +4.6 V on ±5 V supplies), making it suitable for driving 75 Ω video lines and interfacing directly with high-resolution SAR and pipeline ADCs without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 2.1 nV/√Hz @ 50 kHz - enables high-SNR amplification of microvolt-level sensor signals without degrading 16-bit ENOB. |
| Small-Signal Bandwidth | 205 MHz @ G = +2, ±5 V - supports >100 MSPS ADC sampling with minimal group delay variation. |
| Settling Time | 23 ns to 0.01% for 1 V step - ensures accurate acquisition in fast successive-approximation cycles. |
| Quiescent Current | 6.7 mA enabled / 1.3 mA disabled @ 5 V - reduces power in battery-powered portable instruments during idle periods. |
| Output Disable Turn-Off Time | 50 ns - allows precise timing control in multiplexed analog signal paths or T/H circuits. |
| Input Offset Voltage Drift | 0.5 μV/°C - maintains DC accuracy over industrial temperature range (−40°C to +85°C) without recalibration. |
| Capacitive Load Drive | 120 pF @ 30% overshoot (1 V p-p) - interfaces directly with ADC input capacitance or long PCB traces without instability. |
Pinout & Package
AD8021ARMZ-REEL is housed in an 8-lead MSOP (RM-8) package, 3 mm × 3 mm × 0.85 mm, with exposed pad for thermal enhancement. Pin 1 is LOGIC REFERENCE (reference for DISABLE logic threshold); pin 8 is active-low DISABLE. The package is RoHS-compliant and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LOGIC REFERENCE | Reference voltage for DISABLE pin logic threshold | Must be tied to ground or logic low; defines 1.55–1.95 V enable/disable 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 noise specs as −IN; used in noninverting configurations or as reference for differential drive. |
| 4 - −VS | Negative supply rail | Accepts −2.25 V to −12 V; must be decoupled locally with ≥0.1 μF ceramic capacitor. |
| 5 - CCOMP | Compensation capacitor connection | Tied to −VS externally; value (0–10 pF) sets gain-bandwidth product for G = +1 to +10 stability. |
| 6 - VOUT | Amplifier output | Drives 75 Ω video loads or 1 kΩ ADC inputs; linear output current = 60 mA @ ±5 V. |
| 7 - +VS | Positive supply rail | Accepts +2.25 V to +12 V; requires local 0.1 μF ceramic + 10 μF tantalum decoupling. |
| 8 - DISABLE | Active-low output disable control | Pulled high (>1.9 V above pin 1) to enable; pulled low (<1.7 V above pin 1) to reduce IQ to 1.3 mA. |
Key Features
| Feature | Design Value |
|---|---|
| Custom gain-bandwidth compensation | Single external capacitor (CCOMP) enables stable operation from G = +1 to +10 without changing internal compensation. |
| Output disable with fast switching | Reduces quiescent current to 1.3 mA and provides 50 ns turn-off time - ideal for time-gated signal acquisition. |
| Low distortion at high frequency | −93 dBc HD2 / −108 dBc HD3 @ 1 MHz enables clean amplification in ultrasound and communications baseband stages. |
| Wide supply voltage range | Operates from ±2.25 V to ±12 V or single 5 V - simplifies system power architecture across portable and industrial platforms. |
| Industrial temperature grade | Specified from −40°C to +85°C with drift-critical parameters (VOS, IB) characterized across range. |
Applications
| ADC Preamp for 16-Bit SAR Converters | Ultrasound Signal Conditioning |
|---|---|
Use Scenario: Driving the input of a 16-bit, 1 MSPS SAR ADC in a portable ECG monitor with low-power budget. IC Role / Device Role / Timing Role: Precision buffer and gain stage with 0.01% settling in 23 ns, ensuring full ENOB retention during acquisition window. Use Value: 2.1 nV/√Hz noise and 0.5 μV/°C offset drift preserve DC accuracy and SNR across battery life and ambient temperature shifts. | Use Scenario: Amplifying weak echo return signals (2–15 MHz) in handheld ultrasound probe front-end before digitization. IC Role / Device Role / Timing Role: Low-noise, wideband transimpedance or voltage gain stage with 205 MHz bandwidth at G = +2. Use Value: −93 dBc HD2 at 5 MHz prevents harmonic folding into baseband; 120 pF capacitive load drive accommodates piezoelectric sensor cabling. |
| Portable Instrumentation Signal Chain | Video Line Driver (75 Ω) |
Use Scenario: Signal conditioning block in handheld multimeter or portable oscilloscope analog front-end. IC Role / Device Role / Timing Role: High-speed, low-power op amp supporting multiple gain configurations (G = +1 to +10) via CCOMP pin. Use Value: 6.7 mA quiescent current at 5 V and MSOP-8 footprint minimize board area and battery drain without sacrificing bandwidth. | Use Scenario: Driving composite NTSC video signals over 75 Ω coaxial cable in test equipment or medical display interface. IC Role / Device Role / Timing Role: Unity-gain stable line driver with 0.03% differential gain and 0.04° phase error. Use Value: Maintains broadcast-grade video fidelity (NTSC/PAL) while delivering ±3 V swing into 75 Ω load with minimal power. |
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 precision stages where power is secondary | Select ADA4898-1ARMZ 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, no DISABLE | Suitable for RF IF amplification >100 MHz but less optimal for 16-bit ADC buffering due to noise and lack of DC precision | Choose LMH6629MA/NOPB only for wideband AC-coupled gain stages where speed outweighs noise and DC specs. |
Compared with ADA4898-1ARMZ and LMH6629MA/NOPB, AD8021ARMZ-REEL uniquely balances 2.1 nV/√Hz noise, 205 MHz bandwidth, output disable, and CCOMP-based gain flexibility - making it the optimal choice for portable, battery-sensitive 16-bit data acquisition systems requiring both speed and precision.
Availability
AD8021ARMZ-REEL is available at Aetrix Electronics and suitable for portable instrumentation, ultrasound front-ends, and 16-bit ADC preamplification requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for AD8021ARMZ-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 AD8021ARMZ-REEL belongs to Analog Devices' precision high-speed op amp product line, engineered specifically for 16-bit resolution systems demanding low noise, fast settling, and flexible gain configuration in compact, low-power packages.
FAQ
What is the recommended compensation capacitor value for AD8021ARMZ-REEL at G = +5?
The AD8021ARMZ-REEL datasheet specifies a 2 pF compensation capacitor (CCOMP) for stable operation at G = +5 with ±5 V supplies. This value is validated in Table 1 under "DYNAMIC PERFORMANCE" and ensures ≤30% overshoot and 205 MHz bandwidth. Larger values reduce bandwidth; smaller values risk peaking or instability. Always verify with actual layout parasitics using the test circuit in Figure 48.
Can AD8021ARMZ-REEL operate from a single 5 V supply?
Yes, AD8021ARMZ-REEL supports single 5 V operation (VCC = 5 V, VEE = 0 V), with input common-mode range of 0.9 V to 4.6 V and output swing of 1.10 V to 3.60 V. Quiescent current is 6.7 mA enabled. However, note reduced bandwidth (155 MHz @ G = +2) and output swing versus dual-supply mode - confirm headroom requirements for your signal chain.
How does the DISABLE pin function on AD8021ARMZ-REEL?
The DISABLE pin (pin 8) is active-low. When pulled ≥1.95 V above LOGIC REFERENCE (pin 1), the amplifier operates normally. When pulled ≤1.55 V above pin 1, output is disabled and quiescent current drops to 1.3 mA. Pin 1 must be tied to ground or logic low; if unused, tie pin 8 to +VS. Turn-off time is 50 ns, with −40 dB isolation at 10 MHz.
What is the maximum capacitive load AD8021ARMZ-REEL can drive while remaining stable?
AD8021ARMZ-REEL drives up to 120 pF with ≤30% overshoot at 1 V p-p output (Table 1). For larger loads, add a series resistor (e.g., 10–50 Ω) between VOUT and the load to isolate capacitance. Stability is also enhanced by minimizing trace length and using proper grounding - refer to Figure 26 and PCB Layout Considerations (page 21) in the AD8021 Rev. F datasheet.
Is AD8021ARMZ-REEL pin-compatible with other op amps in the AD80xx family?
No, AD8021ARMZ-REEL has a unique pinout including dedicated CCOMP (pin 5) and LOGIC REFERENCE (pin 1), not found on AD8001/AD8003/AD8011. It is not pin-compatible with any other ADI op amp. Substitution requires schematic and layout revision. Always validate pin mapping against Figure 4 (Pin Configuration) in the AD8021 Rev. F datasheet before redesign.
AD8021ARMZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-MSOP
AD8021ARMZ-REEL FAQ
1.How can I place an order for AD8021ARMZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8021ARMZ-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 AD8021ARMZ-REEL reliable?
The price and inventory of AD8021ARMZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8021ARMZ-REEL is usually 5 days.
3.What payment methods are accepted for AD8021ARMZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8021ARMZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8021ARMZ-REEL?
AD8021ARMZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8021ARMZ-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 AD8021ARMZ-REEL?
For technical support, including AD8021ARMZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8021ARMZ-REEL requirements.
6.How does Aetrix verify that AD8021ARMZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD8021ARMZ-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 AD8021ARMZ-REEL meets industry standards.
7.What is the process for return or replacement of AD8021ARMZ-REEL?
All AD8021ARMZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8021ARMZ-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 AD8021ARMZ-REEL part is unused and in its original packaging.
Return procedure for AD8021ARMZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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