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Analog Devices Inc. AD9631ARZ
- Part No.:
- AD9631ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD9631ARZ.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:439
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Product details
Overview
AD9631ARZ from Analog Devices is a unity-gain-stable, ultralow-distortion voltage feedback op amp optimized for high-fidelity signal conditioning in demanding analog front-ends. It delivers 320 MHz small-signal bandwidth, −72 dBc third-harmonic distortion at 20 MHz, 1300 V/µs slew rate, and 16 ns settling time to 0.01% - enabling precise ADC input driving and professional video line amplification.
For engineers reviewing the AD9631ARZ datasheet, AD9631ARZ pinout, AD9631ARZ application, or AD9631ARZ equivalent, this page provides verified specifications, SOIC-8 package layout, real-world use cases in ADC driver and IF amplifier roles, and validated alternative options for gain-stable wideband op amp selection.
Technical Context
The AD9631ARZ employs a proprietary voltage feedback architecture that achieves current-feedback-like slew performance (1300 V/µs) while retaining classical op amp stability and predictable gain-bandwidth trade-offs. Its 65° phase margin ensures robust closed-loop behavior across gains ≥1 without external compensation.
It features balanced high-impedance inputs (500 kΩ), low input capacitance (1.2 pF), and rail-to-rail output swing capability (±3.2 V into 150 Ω). Designed for ±3 V to ±5 V dual supplies, it draws only 17 mA quiescent current and maintains <0.04% differential gain error at 3.58 MHz for broadcast video compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal BW (−3 dB) | 320 MHz at G = +1 - supports baseband-to-IF signal amplification up to UHF without gain peaking. |
| Slew rate | 1300 V/µs - enables accurate reproduction of fast transient signals such as DAC output steps or pulse waveforms. |
| THD+N @ 20 MHz | −72 dBc (RL = 500 Ω) - meets stringent SFDR requirements for 12-bit ADC drivers and communications receivers. |
| Settling time (0.01%) | 16 ns for 2 V step - ensures minimal timing uncertainty in high-speed data acquisition systems. |
| Input voltage noise | 7.0 nV/√Hz - preserves SNR in low-level signal amplification stages before ADCs or filters. |
| Supply range | ±3 V to ±5 V - compatible with standard industrial and instrumentation power rails. |
| Quiescent current | 17 mA - balances high-speed performance with moderate power consumption in continuous operation. |
Pinout & Package
AD9631ARZ is housed in an 8-lead SOIC (R) package with exposed pad (RoHS-compliant, JEDEC MS-012AC). Pin 1 is marked by a notch or dot; pins are numbered counterclockwise from top-left when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (NC) | Internally unconnected; must be left floating or tied to ground per layout best practices. |
| 2 | Inverting Input (−IN) | Differential input node; high impedance (500 kΩ), low capacitance (1.2 pF) for stable feedback network design. |
| 3 | Noninverting Input (+IN) | Differential input node; matched to Pin 2 for common-mode rejection and active filter symmetry. |
| 4 | Negative Supply (−VS) | Ground reference for negative rail; requires local 0.1 µF + 10 µF bypassing for high-frequency PSRR. |
| 5 | No Connect (NC) | Internally unconnected; no routing or termination required. |
| 6 | Output (OUT) | Capable of ±3.2 V swing into 150 Ω; low output resistance (0.3 Ω) minimizes gain error under load. |
| 7 | Positive Supply (+VS) | Power input for positive rail; same bypassing requirement as Pin 4 for supply rejection above 10 MHz. |
| 8 | No Connect (NC) | Internally unconnected; leave unconnected per datasheet Figure 1. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Operates stably at G = +1 without external compensation - simplifies PCB layout for noninverting buffers and I/V converters. |
| Ultralow harmonic distortion | −72 dBc third harmonic at 20 MHz enables clean signal chain performance in RF/IF receiver front-ends. |
| High-speed settling | 16 ns to 0.01% reduces aperture uncertainty in sampling systems using external clocked ADCs. |
| Video-grade linearity | 0.02% differential gain / 0.02° differential phase at 3.58 MHz meets SMPTE/ITU-R BT.601 broadcast standards. |
| Low input current noise | 2.0 pA/√Hz supports high-Z sensor interfaces and photodiode transimpedance applications without added noise floor degradation. |
Applications
| ADC Input Driver | Differential Amplifier |
|---|---|
Use Scenario: Driving the analog input of a 12-bit, 100 MSPS flash ADC in a medical ultrasound digitizer. IC Role / Device Role / Timing Role: Single-ended to differential conversion and bandwidth-limited anti-alias filtering with sub-ns timing fidelity. Use Value: 16 ns settling time ensures <0.5 LSB error during ADC aperture window; −72 dBc distortion preserves ENOB >11.5 bits. |
Use Scenario: Building a fully differential signal path for a high-resolution data acquisition system with programmable gain. IC Role / Device Role / Timing Role: Precision gain stage with matched input impedance and CMRR >90 dB up to 100 MHz. Use Value: Balanced 500 kΩ inputs enable symmetrical R-C filter design; 65° phase margin prevents oscillation in cascaded stages. |
| IF/RF Amplifier | Professional Video Line Driver |
Use Scenario: Amplifying 70 MHz IF signals in a software-defined radio receiver before quadrature demodulation. IC Role / Device Role / Timing Role: Fixed-gain broadband amplifier with flat frequency response and minimal group delay variation. Use Value: 320 MHz −3 dB bandwidth and <1 dB gain flatness to 130 MHz ensure amplitude integrity across entire IF band. |
Use Scenario: Driving 75 Ω coaxial video lines in broadcast-quality camera back-end processing. IC Role / Device Role / Timing Role: DC-coupled line driver with ultra-low differential phase/gain error for composite and component video. Use Value: 0.02% differential gain error eliminates hue shifts; 1300 V/µs slew rate handles 480p/60 video transitions without edge ringing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed voltage feedback op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8001ARZ | Higher supply current (20 mA), lower small-signal BW (800 MHz), not unity-gain stable (min G = +2). | Better suited for fixed-gain IF amplifiers where G ≥ 2; unsuitable for G = +1 buffer or DAC I/V conversion. | Select AD8001ARZ only when gain ≥ +2 is acceptable and higher power budget allows. |
| LMH6629MA/NOPB | Lower distortion (−85 dBc @ 20 MHz), higher quiescent current (25 mA), SOIC-8 but different pinout (no NC pins). | Superior SFDR for precision test equipment; incompatible pin mapping requires PCB redesign. | Choose LMH6629MA/NOPB when SFDR is primary constraint and layout revision is feasible. |
Compared with AD9631ARZ, AD8001ARZ offers wider bandwidth but requires minimum gain of +2 and consumes more power, while LMH6629MA/NOPB delivers lower distortion at higher current and demands board-level changes due to non-compatible pin assignment.
Availability
AD9631ARZ is available at Aetrix Electronics and suitable for ADC input driver, IF/RF amplifier, and professional video line driver applications requiring stable component supply, long-term industrial temperature support (−40°C to +85°C), and SOIC-8 compatibility.
Supply support for AD9631ARZ 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 AD9631ARZ belongs to Analog Devices' precision high-speed op amp product line, engineered specifically for applications demanding wide bandwidth, ultralow distortion, and fast settling in data acquisition, communications, and video systems.
FAQ
What is the maximum recommended supply voltage for AD9631ARZ?
The AD9631ARZ has an absolute maximum supply voltage rating of ±6.0 V (12.6 V total), but its specified operating range is ±3.0 V to ±5.0 V. Operation at ±5.0 V delivers optimal dynamic performance including 320 MHz bandwidth and −72 dBc distortion at 20 MHz. Exceeding ±5.0 V may increase power dissipation beyond thermal limits without performance benefit.
Is AD9631ARZ unity-gain stable, and what does that mean for circuit design?
Yes, AD9631ARZ is unity-gain stable - it remains stable with closed-loop gain of +1 without requiring external compensation components. This allows direct use in noninverting buffer configurations and DAC current-to-voltage converters without risk of oscillation, simplifying layout and reducing bill-of-materials cost compared to minimum-gain-restricted op amps like AD9632.
Can AD9631ARZ drive a 50 Ω load, and what is its output swing capability?
AD9631ARZ can drive 50 Ω loads, though output swing is reduced: typical ±3.2 V into 150 Ω becomes ±2.5 V into 50 Ω per Figure 49. For full-swing 50 Ω driving, consider adding a series resistor (e.g., 25 Ω) to match source impedance and minimize reflections, especially in RF applications where signal integrity is critical.
What is the purpose of the NC pins on AD9631ARZ, and how should they be handled?
Pins 1, 5, and 8 on AD9631ARZ are No Connect (NC) terminals - internally unconnected silicon nodes. They must be left floating or tied to ground (not VS) to avoid parasitic coupling. Do not route traces to these pins unless required for mechanical anchoring; grounding improves EMI immunity without affecting electrical performance.
How does AD9631ARZ compare to AD9632ARZ in terms of gain stability and bandwidth?
AD9631ARZ is unity-gain stable (G ≥ +1), delivering 320 MHz small-signal bandwidth at G = +1. AD9632ARZ requires minimum gain of +2 and achieves 250 MHz bandwidth at G = +2. The AD9631ARZ's lower minimum gain makes it suitable for buffers and I/V conversion, while AD9632ARZ trades gain flexibility for improved large-signal performance at higher gains.
AD9631ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1300V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 320 MHz
- Current - Input Bias:
- 2 µA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 17mA
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 6 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD9631ARZ FAQ
1.How can I place an order for AD9631ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9631ARZ 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 AD9631ARZ reliable?
The price and inventory of AD9631ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9631ARZ is usually 5 days.
3.What payment methods are accepted for AD9631ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9631ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9631ARZ?
AD9631ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9631ARZ 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 AD9631ARZ?
For technical support, including AD9631ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9631ARZ requirements.
6.How does Aetrix verify that AD9631ARZ is sourced from the original manufacturer or authorized distributors?
All AD9631ARZ 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 AD9631ARZ meets industry standards.
7.What is the process for return or replacement of AD9631ARZ?
All AD9631ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD9631ARZ, 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 AD9631ARZ part is unused and in its original packaging.
Return procedure for AD9631ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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