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Analog Devices Inc. AD818ANZ
- Part No.:
- AD818ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Video Amps and Modules
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD818ANZ.pdf
- Description:
- IC AMP VOLTAGE FEEDBACK 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
AD818ANZ from Analog Devices is a low-cost, low-power voltage-feedback video operational amplifier optimized for gain ≥ +2 or ≤ –1 configurations in professional video signal conditioning. It delivers 55 MHz 0.1 dB bandwidth (G = +2), 0.01% differential gain error, and 50 mA output drive-enabling back-terminated 75 Ω cable driving in broadcast cameras and video line drivers.
For engineers reviewing the AD818ANZ datasheet, AD818ANZ pinout, AD818ANZ application, or AD818ANZ equivalent, this page provides verified technical context, real-world video performance metrics, package-specific layout guidance, and validated alternatives for NTSC/HD video signal chains requiring stable DC-coupled gain stages with <80 ns settling to 0.01%.
Technical Context
The AD818ANZ employs a degenerated NPN differential pair feeding a folded-cascode gain stage and class-AB emitter-follower output buffer-enabling high current delivery while maintaining low distortion. Its architecture supports stable operation driving capacitive loads ≤10 pF and terminated 75 Ω cables without external compensation.
It is fully specified for single +5 V and dual ±5 V to ±15 V supplies, with quiescent current capped at 7.5 mA across all conditions. The device achieves 45 ns settling to 0.1% and 80 ns to 0.01% on a 10 V step, with 500 V/μs slew rate at ±15 V-making it suitable for fast-pulse video monitoring and CCD imaging front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| 0.1 dB Bandwidth | 55 MHz at G = +2 (±15 V); ensures flat video response through NTSC/PAL subcarriers and up to 480p timing |
| Differential Gain Error | 0.01% (NTSC, ±5 V, RL = 150 Ω); preserves color fidelity in analog video transmission |
| Differential Phase Error | 0.05° (NTSC, ±15 V, RL = 150 Ω); maintains chroma timing integrity for broadcast-grade signals |
| Slew Rate | 500 V/μs (±15 V); supports clean 10 V step transitions with minimal overshoot in line drivers |
| Output Current | 50 mA min (±5 V/±15 V); drives 75 Ω back-terminated coaxial cables directly without buffers |
| Supply Current | 7.5 mA max (±5 V); enables low-power video processing in portable or thermally constrained systems |
| Settling Time | 80 ns to 0.01% (0 V–10 V step, AV = –1); meets timing requirements for HD video pixel clock domains |
Pinout & Package
AD818ANZ is housed in an 8-lead plastic dual in-line package (PDIP, N-8) per JEDEC MS-001, with 0.300″ body width and 0.100″ lead pitch. Pin 1 is top-left corner when notch faces up; leads are straight (non-gull-wing). Thermal resistance θJA = 90°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (–) | Connects to wiper of 10 kΩ potentiometer between Pins 5 and 8 for input offset trimming (±10 mV range) |
| 2 | Inverting Input (–IN) | High-impedance summing node; requires balancing resistor for bias current cancellation in precision circuits |
| 3 | Noninverting Input (+IN) | DC-coupled input path; common-mode range extends to within 1.2 V of ground on +5 V supply |
| 4 | –VS | Negative supply rail; must be bypassed with 0.1 μF ceramic capacitor placed ≤5 mm from pin |
| 5 | Offset Null (+) | Connects to one end of nulling potentiometer; forms adjustable feedback path for VOS correction |
| 6 | Output | Class-AB emitter follower; capable of sourcing/sinking 50 mA into 150 Ω loads with <0.1% THD |
| 7 | +VS | Positive supply rail; accepts +5 V single supply or ±15 V dual supply; bypassing critical above 10 MHz |
| 8 | Offset Null (–) | Second terminal of nulling potentiometer; completes three-terminal offset adjustment network |
Key Features
| Feature | Design Value |
|---|---|
| Video-optimized AC performance | 0.1 dB flatness to 55 MHz and 0.01%/0.05° differential gain/phase errors meet SMPTE 253M broadcast compliance |
| Flexible power architecture | Operates from +5 V single supply or ±5 V to ±15 V dual supplies-enabling reuse across legacy and modern video platforms |
| High-output-current buffer | 50 mA continuous output drives 75 Ω coaxial lines directly, eliminating need for external line drivers in camera modules |
| Low-power operation | 7.5 mA max quiescent current allows integration into battery-powered video encoders and portable test equipment |
| Fast settling precision | 80 ns to 0.01% on 10 V step enables accurate sampling in digital video test fixtures and waveform monitors |
Applications
| Professional Video Cameras | Video Line Drivers |
|---|---|
Use Scenario: Signal conditioning in broadcast-grade camera heads prior to analog-to-digital conversion. IC Role / Device Role / Timing Role: Fixed-gain +2 video amplifier driving ADC input with DC coupling and minimal group delay variation. Use Value: Preserves luminance/chroma separation via 0.01% differential gain error, enabling accurate RGB reconstruction in studio environments. |
Use Scenario: Driving 75 Ω coaxial cable from video processor to monitor or distribution amplifier. IC Role / Device Role / Timing Role: Back-terminated line driver with unity-gain stable configuration and 50 mA output capability. Use Value: Eliminates external buffer stages by delivering full 1 Vp-p NTSC signal into 75 Ω load with 55 MHz 0.1 dB flatness. |
| CCD Imaging Systems | Video Test Equipment |
Use Scenario: Amplifying fast-rising pixel clock signals and analog video outputs from linear CCD arrays. IC Role / Device Role / Timing Role: High-speed gain stage in 3-op-amp instrumentation amplifier topology (e.g., Figure 11). Use Value: 45 ns settling to 0.1% ensures accurate pulse fidelity for high-resolution line-scan applications up to 20 MHz pixel rates. |
Use Scenario: Precision waveform generation and measurement in oscilloscope vertical amplifiers and video analyzers. IC Role / Device Role / Timing Role: Low-noise, low-distortion active filter and gain block in calibrated reference signal paths. Use Value: 63 dB THD at 1 MHz and 10 nV/√Hz input voltage noise support sub-0.1% amplitude accuracy in metrology-grade instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar video op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD817ARZ | Lower 3 dB bandwidth (50 MHz vs. 130 MHz at G = +2), higher input bias current (500 nA vs. 6.6 μA), no offset null pins | Better suited for general-purpose audio or lower-frequency video where 0.01% settling time is not required | Select AD817ARZ only if cost sensitivity outweighs video bandwidth and settling time needs |
| LMH6629MA/NOPB | Higher slew rate (1800 V/μs), wider 0.1 dB bandwidth (120 MHz), but 12.5 mA quiescent current and no single-supply optimization | Preferred for ultra-high-definition video (>1080p) or wideband RF IF amplification where power budget allows | Choose LMH6629MA/NOPB when >100 MHz flatness and <20 ns settling are mandatory, accepting higher supply current |
Compared with AD817ARZ and LMH6629MA/NOPB, the AD818ANZ uniquely balances broadcast-video spectral fidelity, low-power operation, and PDIP-compatible layout-making it the optimal choice for cost-sensitive, thermally constrained NTSC/PAL line drivers requiring guaranteed 0.01% settling and 75 Ω drive capability.
Availability
AD818ANZ is available at Aetrix Electronics and suitable for professional video cameras, broadcast infrastructure line drivers, CCD imaging front-ends, and video test equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for AD818ANZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.
The AD818 belongs to Analog Devices' precision video op amp product line, engineered specifically for analog video signal conditioning in broadcast, medical imaging, and industrial vision systems where differential gain/phase accuracy and cable drive capability are critical.
FAQ
What is the maximum capacitive load the AD818ANZ can drive without oscillation?
The AD818ANZ is characterized to drive capacitive loads up to 10 pF stably across all gain configurations and supply voltages. When driving heavier loads (e.g., >20 pF), external compensation-such as a small series resistor (10–50 Ω) at the output or feedback capacitance-must be added. This limit is confirmed in the "Cap Load Drive" specification (10 pF) and TPC 6 (closed-loop output impedance vs. frequency), where phase margin remains >45° up to 10 pF under ±15 V operation. The AD818ANZ's internal compensation is optimized for video bandwidth, not general-purpose stability.
Does the AD818ANZ support true single-supply operation with rail-to-rail input and output?
The AD818ANZ supports single +5 V operation but does not feature rail-to-rail input or output. Its input common-mode range extends to +3.8 V and +1.2 V (min) on +5 V supply, and output swing is specified as 1.5 V to 3.5 V (p-p) into 500 Ω. Figure 6 in the datasheet shows a practical single-supply configuration using AC coupling and level-shifting resistors to center the output at 2.5 V. Full rail-to-rail performance requires devices like the ADA4800 series-not the AD818ANZ.
Can the AD818ANZ replace the AD813 in existing designs?
No-the AD818ANZ is not a functional or pin-compatible replacement for the AD813. The AD813 is a differential receiver (current-feedback, dual-input) optimized for balanced line reception, while the AD818ANZ is a single-ended voltage-feedback op amp with offset null pins and video-optimized AC specs. Their pinouts differ fundamentally: AD813 has IN+, IN–, VOCM, and differential outputs; AD818ANZ has –IN, +IN, OUTPUT, ±VS, and two offset null terminals. Substitution would require full schematic and layout revision.
What is the thermal derating behavior of the AD818ANZ in its PDIP package?
The AD818ANZ in the N-8 PDIP package has a junction-to-ambient thermal resistance (θJA) of 90°C/W. Derating begins at +70°C ambient: maximum power dissipation drops linearly from 1.0 W at +25°C to 0 W at +150°C junction temperature (TJ = 150°C). Figure 3 confirms this slope-e.g., at +85°C ambient, max dissipation is ~0.72 W. This derating applies strictly to free-air convection; PCB copper area or airflow significantly improves thermal performance but is not factored into the datasheet curve.
How does the AD818ANZ's differential phase error vary with supply voltage?
According to TPC 19, the AD818ANZ's differential phase error increases from 0.045° at ±15 V to 0.10° at +5 V single supply-while differential gain error rises from 0.005% to 0.08%. This degradation occurs because reduced supply headroom compresses the output stage's linear region and increases crossover distortion in the class-AB buffer. For broadcast applications demanding <0.05° phase error, dual ±12 V or ±15 V operation is recommended over +5 V single supply.
AD818ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Voltage Feedback
- Output Type:
- -
- Number of Circuits:
- 1
- -3db Bandwidth:
- 130 MHz
- Slew Rate:
- 500V/µs
- Current - Supply:
- 7 mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply, Single/Dual (±):
- 5V ~ 36V, ±2.5V ~ 18V
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-PDIP
AD818ANZ FAQ
1.How can I place an order for AD818ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD818ANZ 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 AD818ANZ reliable?
The price and inventory of AD818ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD818ANZ is usually 5 days.
3.What payment methods are accepted for AD818ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD818ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD818ANZ?
AD818ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD818ANZ 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 AD818ANZ?
For technical support, including AD818ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD818ANZ requirements.
6.How does Aetrix verify that AD818ANZ is sourced from the original manufacturer or authorized distributors?
All AD818ANZ 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 AD818ANZ meets industry standards.
7.What is the process for return or replacement of AD818ANZ?
All AD818ANZ units undergo pre-shipment inspection (PSI). If there is an issue with AD818ANZ, 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 AD818ANZ part is unused and in its original packaging.
Return procedure for AD818ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD818ANZ Tags
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LT6552CS8#PBF
Analog Devices Inc.
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LT6205IS5#TRPBF
Analog Devices Inc.
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LT6206IMS8#TRPBF
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LT6552IS8#PBF
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LT1252CS8#PBF
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