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Analog Devices Inc. AD9631ANZ
- Part No.:
- AD9631ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD9631ANZ.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,065
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Product details
Overview
AD9631ANZ from Analog Devices is a unity-gain-stable, voltage-feedback operational amplifier optimized for high-fidelity signal conditioning in precision analog systems. It delivers 320 MHz small-signal bandwidth, 175 MHz large-signal bandwidth (4 Vp-p), −72 dBc third-harmonic distortion at 20 MHz, and 1300 V/µs slew rate, enabling use as an ADC input driver in 12-bit flash converters and professional video line drivers.
For engineers reviewing the AD9631ANZ datasheet, AD9631ANZ pinout, AD9631ANZ application, or AD9631ANZ equivalent, key selection criteria include its G = +1 stability, ultralow harmonic distortion at RF/IF frequencies, 16 ns settling time to 0.01%, and compatibility with ±3 V to ±5 V supplies in industrial temperature range (−40°C to +85°C).
Technical Context
The AD9631ANZ employs a proprietary voltage-feedback architecture that combines classical op amp predictability with current-feedback–class transient response. Its 65° phase margin ensures stable operation at unity gain while delivering 1300 V/µs slew rate via on-demand current delivery-not fixed front-end biasing.
It achieves 0.1 dB flatness up to 130 MHz with RF = 140 Ω, supports balanced high-impedance inputs for active filter design, and maintains low input noise density (7.0 nV/√Hz) and current noise (2.5 pA/√Hz) across 1 MHz–200 MHz-critical for photodiode transimpedance and IF amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal BW (−3 dB) | 320 MHz @ G = +1, VOUT ≤ 0.4 Vp-p: enables baseband-to-IF signal amplification without roll-off in 100+ MSPS data acquisition. |
| Large-signal BW | 175 MHz @ 4 Vp-p: sustains full-scale pulse fidelity for ADC driving and video line applications. |
| THD @ 20 MHz | −72 dBc (RL = 500 Ω): meets stringent SFDR requirements for 12-bit ADC front ends and HDTV signal paths. |
| Slew rate | 1300 V/µs: eliminates slewing-induced distortion on fast 2 V step signals, critical for DAC I/V conversion. |
| Settling time | 16 ns to 0.01%: ensures accurate sampling window closure in high-speed digitization systems. |
| Input voltage noise | 7.0 nV/√Hz: preserves SNR in low-level sensor and photodiode amplification stages. |
| Supply range | ±3 V to ±5 V: supports dual-rail operation in portable and industrial equipment with regulated ±5 V rails. |
Pinout & Package
AD9631ANZ is packaged in an 8-lead PDIP (N) with lead spacing of 0.300 inches and body width of 0.355 inches. 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 (NC) | No connect | Internally unconnected; must remain floating-no external tie required. |
| 2 (−IN) | Inverting input | Differential input node; requires matched trace length and impedance control for optimal CMRR and distortion performance. |
| 3 (+IN) | Noninverting input | High-impedance input (500 kΩ); used for single-ended or differential configurations with external feedback network. |
| 4 (−VS) | Negative supply | Connect to clean −3 V to −5 V rail with local 0.1 µF + 10 µF bypassing to minimize PSRR degradation. |
| 5 (NC) | No connect | Internally unconnected; leave unpopulated or floating. |
| 6 (OUT) | Output | Capable of ±3.2 V swing into 150 Ω; add series resistor (10–40 Ω) when driving >10 pF capacitive loads. |
| 7 (+VS) | Positive supply | Connect to clean +3 V to +5 V rail with identical bypassing as −VS to maintain symmetry and PSRR. |
| 8 (NC) | No connect | Internally unconnected; no routing or termination needed. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Operates robustly at G = +1 without external compensation-enables simple buffer and gain-of-one configurations. |
| Ultralow harmonic distortion | −72 dBc third harmonic at 20 MHz ensures minimal spectral regrowth in wideband communication and video signal chains. |
| Fast settling time | 16 ns to 0.01% allows precise timing alignment in multi-channel ADC systems with sub-62.5 ns sampling periods. |
| High slew rate | 1300 V/µs prevents nonlinear clipping during large transient steps-essential for pulse and video waveform integrity. |
| Balanced high-Z inputs | 500 kΩ input resistance and 1.2 pF capacitance enable flexible active filter topologies with predictable pole placement. |
Applications
| ADC Input Driver | Differential Amplifier |
|---|---|
Use Scenario: Driving the analog input of 12-bit, 100+ MSPS flash ADCs in test equipment and radar receivers. IC Role / Device Role / Timing Role: Buffer and level-shift analog signal while preserving transient fidelity and minimizing harmonic corruption before digitization. Use Value: 175 MHz large-signal bandwidth and 16 ns settling ensure full-scale accuracy across entire Nyquist band without aperture jitter penalty. | Use Scenario: Converting single-ended sensor outputs (e.g., strain gauge bridges) to balanced differential signals for noise-immune transmission. IC Role / Device Role / Timing Role: Precision instrumentation amplifier core with matched input impedance and low offset drift. Use Value: 0.03% differential gain error and 0.02° phase error preserve amplitude/phase integrity in high-resolution measurement systems. |
| Professional Video Line Driver | IF/RF Amplifier |
Use Scenario: Driving 75 Ω coaxial video lines in broadcast-grade SD/HD/3G-SDI equipment and medical imaging displays. IC Role / Device Role / Timing Role: Final-stage line driver with DC-coupled output and ultraflat frequency response. Use Value: 130 MHz 0.1 dB flatness and <0.02° differential phase meet SMPTE 259M/424M compliance for real-time video transport. | Use Scenario: Amplifying intermediate-frequency signals (e.g., 10–100 MHz) in SDR front ends and spectrum analyzers. IC Role / Device Role / Timing Role: Wideband gain block with low noise figure (14 dB) and high IP3 (46 dBm). Use Value: 7.0 nV/√Hz input noise and −95 dBc SFDR at 5 MHz prevent receiver desensitization and intermodulation in crowded RF environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8000ARZ | Wider 1.5 GHz small-signal BW but higher 10.5 nV/√Hz noise; not unity-gain stable (min G = +3). | Requires gain ≥ +3; unsuitable for G = +1 buffers or video line drivers needing DC coupling at unity gain. | Select AD8000ARZ only when >1 GHz bandwidth is mandatory and gain can be ≥ +3; otherwise AD9631ANZ provides superior distortion/noise trade-off at G = +1. |
| LMH6629MA/NOPB | 1.5 GHz BW, 1.3 nV/√Hz noise, but −55 dBc SFDR @ 20 MHz-17 dB worse than AD9631ANZ. | Lower distortion performance limits use in high-SFDR ADC drivers and broadcast video where −70 dBc is required. | Choose LMH6629MA/NOPB for ultra-low-noise preamp stages; choose AD9631ANZ when harmonic suppression dominates system requirements. |
Compared with AD8000ARZ and LMH6629MA/NOPB, AD9631ANZ uniquely balances unity-gain stability, 320 MHz bandwidth, −72 dBc distortion at 20 MHz, and 7.0 nV/√Hz noise-making it the optimal choice for G = +1 ADC drivers, video line drivers, and IF amplifiers where both speed and spectral purity are simultaneously critical.
Availability
AD9631ANZ is available at Aetrix Electronics and suitable for ADC input buffering, professional video line driving, and IF/RF amplification requiring stable component supply across industrial temperature range (−40°C to +85°C) and long-lifecycle production programs.
Supply support for AD9631ANZ 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 AD9631ANZ belongs to Analog Devices' high-speed voltage-feedback op amp product line, engineered specifically for applications demanding simultaneous wide bandwidth, ultralow distortion, and unity-gain stability-including precision data acquisition, broadcast video, and communications infrastructure.
FAQ
What is the maximum recommended supply voltage for AD9631ANZ?
The absolute maximum supply voltage rating for AD9631ANZ is ±6.0 V, but the 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 in the PDIP package and is not characterized for parametric performance.
Does AD9631ANZ require external compensation for unity-gain operation?
No, AD9631ANZ is internally compensated for unity-gain stability and requires no external components to operate reliably at G = +1. The datasheet confirms stable 65° phase margin in noninverting unity-gain configuration with RF = 140 Ω. Adding compensation capacitors degrades bandwidth and settling time and is unnecessary for standard applications.
Can AD9631ANZ drive a 50 Ω load directly?
AD9631ANZ specifies output voltage range of ±3.2 V into 150 Ω, but it can source/sink up to 70 mA and withstand short-circuit currents of 240 mA. Driving a 50 Ω load is feasible with reduced output swing (±2.0 V typical) and increased thermal stress; however, a series resistor (e.g., 25 Ω) is recommended to isolate reactive effects and maintain stability per Figure 62 in the AD9631/AD9632 datasheet Rev. D.
What is the input common-mode voltage range of AD9631ANZ?
The input common-mode voltage range of AD9631ANZ is ±3.4 V when operated with ±5 V supplies. This means both inputs can be biased anywhere between −3.4 V and +3.4 V relative to ground while maintaining linear operation. This range supports rail-to-rail input signal handling in many video and instrumentation applications without level-shifting circuitry.
How does AD9631ANZ compare to AD9632ANZ in terms of gain stability?
AD9631ANZ is unity-gain stable (G ≥ +1), whereas AD9632ANZ is stable only at gains of +2 or greater. This fundamental difference means AD9631ANZ can be used as a buffer or gain-of-one amplifier without risk of oscillation, while AD9632ANZ requires minimum closed-loop gain of +2. Their pinouts and packages are identical, but gain configuration determines functional interchangeability.
AD9631ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD9631ANZ FAQ
1.How can I place an order for AD9631ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9631ANZ 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 AD9631ANZ reliable?
The price and inventory of AD9631ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9631ANZ is usually 5 days.
3.What payment methods are accepted for AD9631ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9631ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9631ANZ?
AD9631ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9631ANZ 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 AD9631ANZ?
For technical support, including AD9631ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9631ANZ requirements.
6.How does Aetrix verify that AD9631ANZ is sourced from the original manufacturer or authorized distributors?
All AD9631ANZ 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 AD9631ANZ meets industry standards.
7.What is the process for return or replacement of AD9631ANZ?
All AD9631ANZ units undergo pre-shipment inspection (PSI). If there is an issue with AD9631ANZ, 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 AD9631ANZ part is unused and in its original packaging.
Return procedure for AD9631ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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