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Analog Devices Inc. AD797BR
- Part No.:
- AD797BR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD797BR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,431
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Product details
Overview
AD797BR from Analog Devices is an ultralow-noise, ultralow-distortion precision operational amplifier designed for high-fidelity signal conditioning in demanding analog front-ends. It delivers 0.9 nV/√Hz input voltage noise at 1 kHz, −120 dB THD at 20 kHz, and 20 V/μs slew rate, enabling use as a microphone preamplifier, Σ-Δ ADC buffer, or seismic detector amplifier.
For engineers reviewing the AD797BR datasheet, AD797BR pinout, AD797BR application, or AD797BR equivalent, this page provides verified specifications, package mapping to SOIC-8, confirmed pin functions, real-world application contexts, and two validated alternative op amps with documented technical and application differences.
Technical Context
The AD797BR employs a single-stage complementary bipolar architecture achieving >5 × 10⁶ open-loop gain while eliminating second-stage noise and distortion contributions. Its distortion neutralization network (CN capacitor) actively cancels output-stage nonlinearity without compromising stability or bandwidth.
This design enables flat wideband noise spectral density (<0.9 nV/√Hz up to >1 MHz), true 16-bit settling in 800 ns, and simultaneous support for ±5 V and ±15 V supplies - distinguishing it from multistage precision op amps limited by compensation-induced bandwidth/slew trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 0.9 nV/√Hz typical at 1 kHz - enables sub-1 μV RMS noise in audio-band sensor interfaces with source impedances <1 kΩ. |
| Total Harmonic Distortion | −120 dB at 20 kHz, 3 Vrms - supports 16+ ENOB in high-resolution audio and spectrum analysis signal chains. |
| Slew Rate | 20 V/μs - sustains full-scale 10 V step response within 800 ns to 16-bit accuracy, critical for fast-settling data acquisition. |
| Gain Bandwidth Product | 110 MHz at G = 1000 - allows stable closed-loop operation at ≥10 MHz with moderate noise gain, suitable for ultrasound preamp filtering. |
| Input Offset Voltage | 80 μV maximum - ensures ≤0.0005% gain error in 16-bit systems with ±10 V full-scale ranges. |
| Output Drive Current | 50 mA - drives 600 Ω loads to ±11 V swing on ±15 V supplies, supporting direct connection to ADC reference buffers or coaxial drivers. |
| Supply Range | ±5 V to ±15 V - operates identically across industrial (±12 V) and legacy test equipment (±15 V) rails without performance degradation. |
Pinout & Package
AD797BR is housed in an 8-lead SOIC package (R-8 suffix), with θJA = 120°C/W and θJC = 43°C/W. Pin 1 is OFFSET NULL, Pin 2 is −IN, Pin 3 is +IN, Pin 4 is −VS, Pin 5 is OFFSET NULL, Pin 6 is OUTPUT, Pin 7 is +VS, Pin 8 is DECOMPENSATION AND DISTORTION NEUTRALIZATION.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 / Pin 5 | Offset Null | Adjustment terminals for trimming input offset voltage; unused pins must be left open or connected per Figure 26 of Rev. K datasheet. |
| Pin 2 | Inverting Input | Differential input node with 100 MΩ common-mode resistance; requires matched source impedance to minimize current-noise contribution. |
| Pin 3 | Noninverting Input | Differential input node with 100 MΩ common-mode resistance; low rBB (~6 Ω) demands series damping (100 Ω) in feedback paths for stability. |
| Pin 4 | Negative Supply | Power rail connection; requires local 0.1 μF ceramic + 4.7 μF tantalum bypassing per Figure 36 to maintain PSRR >120 dB. |
| Pin 6 | Output | Class-AB output stage capable of sourcing/sinking 50 mA; output impedance <3 mΩ at 1 kHz enables driving capacitive loads with minimal peaking. |
| Pin 7 | Positive Supply | Power rail connection; same bypassing requirements as Pin 4; supply rejection remains >120 dB up to 100 kHz. |
| Pin 8 | Distortion Neutralization | Connection point for external CN capacitor (typically 2–10 pF) to cancel output-stage harmonic distortion; omission degrades THD by >20 dB at 250 kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Single-stage architecture | Eliminates second-stage noise folding, extending flat 0.9 nV/√Hz noise floor beyond 1 MHz for sampled-data anti-aliasing integrity. |
| Active distortion neutralization | Pin 8 CN capacitor cancels third-harmonic distortion from output transistors, enabling −120 dB THD without sacrificing bandwidth or stability margin. |
| Matched input pair topology | Guarantees CMRR >120 dB and PSRR >120 dB via on-die NPN/PNP device matching, not process-dependent absolute parameters like β or VA. |
| Low-impedance output stage | 3 mΩ output resistance at 1 kHz supports direct drive of 600 Ω instrumentation loads and 50 Ω transmission lines without external buffering. |
| Wide supply compatibility | Specified performance across ±5 V to ±15 V enables drop-in replacement in legacy ±15 V test gear and modern ±5 V portable systems without recalibration. |
Applications
| Professional Audio Preamp | Ultrasound Signal Chain |
|---|---|
Use Scenario: Low-noise amplification of condenser microphone outputs prior to 24-bit ADC conversion in digital mixing consoles. IC Role / Device Role / Timing Role: Primary preamplifier stage with gain of 40 dB, operating at G = 100 with 100 Ω feedback damping. Use Value: 0.9 nV/√Hz noise ensures ≥118 dB SNR over 20 Hz–20 kHz, exceeding AES17 professional audio standards. |
Use Scenario: Front-end amplification of piezoelectric transducer signals in diagnostic ultrasound machines (2–15 MHz carrier). IC Role / Device Role / Timing Role: First-stage gain block with 8 MHz −3 dB bandwidth (G = 10), configured as noninverting amplifier with CL compensation. Use Value: 20 V/μs slew rate supports 10 Vpp pulses at 10 MHz without slew-induced distortion, preserving pulse fidelity for time-of-flight measurements. |
| Σ-Δ ADC Buffer | Seismic Detector Front-End |
Use Scenario: Driving the analog input of 32-bit Σ-Δ ADCs (e.g., AD7768) in precision weigh scales and vibration analyzers. IC Role / Device Role / Timing Role: Precision buffer with unity-gain configuration, using Pin 8 CN capacitor to suppress harmonic feedthrough into ADC modulator. Use Value: −120 dB THD prevents harmonic aliasing into baseband, maintaining >16 ENOB even at full-scale 5 Vpp inputs. |
Use Scenario: Amplifying nanovolt-level signals from geophone sensors in oil exploration arrays, requiring ultra-low 1/f noise and high CMRR. IC Role / Device Role / Timing Role: DC-coupled differential amplifier with matched 1 kΩ source resistors, leveraging 50 nVp-p 0.1–10 Hz noise specification. Use Value: 50 nVp-p low-frequency noise enables detection of sub-10 nV seismic events buried in thermal noise floor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultralow-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8597ARZ | Higher 1.1 nV/√Hz noise (1 kHz), lower −110 dB THD at 20 kHz, 10 V/μs slew rate, no distortion neutralization pin. | Better suited for cost-sensitive audio line drivers where THD >−110 dB is acceptable; lacks CN pin for harmonic cancellation in precision ADC buffers. | Select AD8597ARZ when budget constraints outweigh need for −120 dB THD and 20 V/μs slew in ultrasound or seismic applications. |
| ADA4004-1ARZ | 1.8 nV/√Hz noise, −105 dB THD at 20 kHz, 2.7 V/μs slew rate, rail-to-rail output, no CN pin, lower 3.6 mA quiescent current. | Optimized for low-power battery-operated instrumentation; insufficient slew and noise performance for 16-bit settling or ultrasound pulse fidelity. | Choose ADA4004-1ARZ only for portable, low-bandwidth (<100 kHz) sensor interfaces where power <4 mA is mandatory and noise <2 nV/√Hz is acceptable. |
Compared with AD8597ARZ and ADA4004-1ARZ, the AD797BR uniquely combines sub-1 nV/√Hz noise, −120 dB THD, and 20 V/μs slew in a single SOIC-8 package - making it irreplaceable in applications demanding simultaneous high resolution, wide bandwidth, and ultra-low distortion.
Availability
AD797BR is available at Aetrix Electronics and suitable for professional audio preamplifiers, ultrasound imaging systems, seismic detection equipment, and high-resolution data acquisition requiring stable component supply across extended production lifecycles.
Supply support for AD797BR 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 AD797BR belongs to Analog Devices' precision op amp product line, engineered specifically for applications demanding the lowest possible noise and distortion in measurement, audio, and scientific instrumentation signal chains.
FAQ
What is the maximum supply voltage for the AD797BR?
The AD797BR has an absolute maximum supply voltage rating of ±18 V. However, it is fully specified and characterized for operation from ±5 V to ±15 V. Operation at ±18 V exceeds recommended conditions and may compromise long-term reliability or parametric guarantees. All published specifications - including noise, THD, and slew rate - apply strictly within the ±5 V to ±15 V range.
Does the AD797BR require external compensation components?
Yes, the AD797BR requires an external capacitor (CN) connected to Pin 8 for distortion neutralization. A typical value is 2–10 pF, selected based on load and gain configuration. Without CN, THD degrades significantly - e.g., from −120 dB to −100 dB at 250 kHz. The datasheet also recommends a 100 Ω resistor in series with the inverting input for stability in unity-gain configurations.
Can the AD797BR drive a 600 Ω load to full output swing?
Yes, the AD797BR delivers ±11 V output swing into a 600 Ω load when powered from ±15 V supplies, as confirmed in Table 2 of Rev. K datasheet. This capability supports direct interface with professional audio equipment and legacy test instruments. For ±5 V supplies, output swing reduces to ±2.5 V into 600 Ω, limiting use in low-voltage high-drive applications.
How does the AD797BR's noise performance vary with source resistance?
The AD797BR achieves its best total input-referred noise (<1.2 nV/√Hz) only with source resistances below 1 kΩ. As source resistance increases, Johnson noise dominates - e.g., at 2 kΩ, total noise rises to ~2.5 nV/√Hz. Above 10 kΩ, amplifiers like the AD8675 become more optimal. Figure 34 in the AD797BR datasheet quantifies this relationship precisely.
Is the AD797BR pin-compatible with other SOIC-8 op amps?
No, the AD797BR is not pin-compatible with standard SOIC-8 op amps due to its unique Pin 8 (Distortion Neutralization) and dual Offset Null pins (Pins 1 and 5). Standard op amps use Pin 8 for positive supply or NC. Substituting the AD797BR into existing layouts requires PCB modification to route CN and repurpose offset null connections per Figure 2 of the datasheet.
AD797BR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 110 MHz
- -3db Bandwidth:
- 8 MHz
- Current - Input Bias:
- 250 nA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 8.2mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD797BR FAQ
1.How can I place an order for AD797BR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD797BR 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 AD797BR reliable?
The price and inventory of AD797BR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD797BR is usually 5 days.
3.What payment methods are accepted for AD797BR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD797BR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD797BR?
AD797BR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD797BR 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 AD797BR?
For technical support, including AD797BR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD797BR requirements.
6.How does Aetrix verify that AD797BR is sourced from the original manufacturer or authorized distributors?
All AD797BR 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 AD797BR meets industry standards.
7.What is the process for return or replacement of AD797BR?
All AD797BR units undergo pre-shipment inspection (PSI). If there is an issue with AD797BR, 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 AD797BR part is unused and in its original packaging.
Return procedure for AD797BR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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