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Analog Devices Inc. LT1818CS8#TRPBF
- Part No.:
- LT1818CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1818CS8#TRPBF.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,972
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Product details
Overview
LT1818CS8#TRPBF from Analog Devices (formerly Linear Technology) is a single high-speed voltage-feedback operational amplifier optimized for wideband, low-distortion signal conditioning in data acquisition and ADC driver applications. It delivers 400MHz gain-bandwidth product, 2500V/µs slew rate, –85dBc harmonic distortion at 5MHz, 6nV/√Hz input noise, and drives ±3.5V into 100Ω on ±5V supplies.
For engineers reviewing the LT1818CS8#TRPBF datasheet, LT1818CS8#TRPBF pinout, LT1818CS8#TRPBF application, or LT1818CS8#TRPBF equivalent, this page provides verified DC accuracy (1.5mV max VOS), thermal stability (–40°C to 85°C), unity-gain stability with 20pF load, and SO-8 package layout guidance for high-fidelity analog front-ends.
Technical Context
The LT1818CS8#TRPBF employs a hybrid voltage-feedback topology with current-feedback slewing characteristics, enabling simultaneous high bandwidth and excellent DC precision. Its complementary bipolar input stage provides first-order bias current cancellation while maintaining low input offset voltage drift (10μV/°C typical).
It operates from ±1.25V to ±5.5V dual supplies or 4V to 11V single supply, supports rail-to-rail output swing (1V to 4V on 5V), and maintains stability without series output resistors up to 20pF capacitive loading in unity-gain configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 400MHz - enables stable closed-loop operation up to 20MHz at gain = 20 without phase margin degradation |
| Slew Rate | 2500V/µs - supports full-scale transient response for 14-bit, 50Msps ADCs with <10ns settling to 0.1% |
| Input Offset Voltage | 1.5mV max - ensures ≤0.3% gain error in precision 12-bit sensor signal chains |
| Harmonic Distortion | –85dBc at 5MHz - meets SFDR >78dB requirement for oversampling ADC drivers |
| Supply Current | 9mA per amplifier - balances speed and power for portable instrumentation with thermal budget constraints |
| Input Noise Density | 6nV/√Hz - contributes <1.2µV RMS noise in 10MHz bandwidth, critical for low-level video amplification |
| Output Drive | ±40mA min - sustains ±3.5V swing into 100Ω loads, enabling direct interface to 75Ω coaxial video lines |
Pinout & Package
LT1818CS8#TRPBF is housed in an 8-lead plastic SO (Small Outline) package with 150°C/W junction-to-ambient thermal resistance. The package conforms to JEDEC MS-012AC standard, with 1.27mm lead pitch and 5.0mm × 4.0mm body dimensions.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | High-impedance differential node; requires matched source impedance to +IN for optimal CMRR and offset cancellation |
| 2 | Non-Inverting Input (+IN) | Complementary bipolar input; base of NPN/PNP pair enabling low input bias current polarity cancellation |
| 3 | Output (OUT) | Class-AB output stage capable of sourcing/sinking ≥40mA; designed for direct drive of 100Ω loads |
| 4 | Negative Supply (V–) | Power return path; must be connected to ground plane with low-inductance trace to minimize PSRR degradation |
| 5 | Positive Supply (V+) | Primary power rail; requires 0.01µF ceramic bypass capacitor placed within 2mm of pin for HF stability |
| 6 | No Connect (NC) | Internally unused; must remain unconnected to avoid parasitic coupling or ESD path disruption |
| 7 | No Connect (NC) | Internally unused; floating connection prevents unintended feedback paths in high-frequency layouts |
| 8 | No Connect (NC) | Internally unused; PCB pad should be omitted or isolated to reduce capacitance to adjacent traces |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable with 20pF load | Eliminates need for external series output resistor in ADC driver configurations, preserving signal integrity |
| Low 6nV/√Hz input noise | Enables high-resolution measurement of µV-level sensor outputs without dominant amplifier noise contribution |
| ±3.5V output swing into 100Ω | Directly interfaces with standard video line drivers and 50Msps sampling systems without level-shifting circuitry |
| 1.5mV max input offset voltage | Reduces calibration overhead in industrial DAQ modules by limiting initial gain error to <0.15% at 10V full scale |
| –40°C to 85°C operating range | Validated performance across automotive under-hood and industrial control cabinet temperature extremes |
Applications
| High-Speed Data Acquisition | Video Signal Conditioning |
|---|---|
Use Scenario: Driving the analog inputs of 14-bit, 50Msps ADCs like LTC1744 in oversampling architectures. IC Role / Device Role / Timing Role: Single-supply differential ADC driver providing 2VP-P full-scale swing with 78dB SFDR at 5MHz. Use Value: Enables 8192-point FFT with no windowing, achieving spurious-free dynamic range exceeding 78dB required for medical imaging front-ends. | Use Scenario: Amplifying composite video signals in broadcast equipment requiring 0.07% differential gain and 0.02° differential phase. IC Role / Device Role / Timing Role: Unity-gain buffer amplifying NTSC/PAL signals with minimal group delay variation across 4.2MHz bandwidth. Use Value: Meets SMPTE RP-168 specifications for professional video routing with <0.1% gain flatness and <0.1° phase linearity. |
| Communications Receiver IF Chain | Active Filter Building Block |
Use Scenario: Intermediate frequency amplification in 5G small-cell base station receivers operating at 2.1GHz carrier with 100MHz channel bandwidth. IC Role / Device Role / Timing Role: High-linearity IF gain block delivering –85dBc HD2/HD3 at 5MHz, supporting 256-QAM modulation fidelity. Use Value: Maintains EVM <2.5% for 256-QAM signals by suppressing intermodulation products below receiver noise floor. | Use Scenario: Implementing 4th-order Butterworth low-pass filters in test equipment with cutoff frequencies up to 100MHz. IC Role / Device Role / Timing Role: Dual-amplifier active filter section using Sallen-Key topology with 0.707 damping factor. Use Value: Achieves <–60dB stopband attenuation at 2× cutoff frequency while maintaining <0.1dB passband ripple due to low GBW variation. |
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 |
|---|---|---|---|
| LT1815CS8#TRPBF | 220MHz GBW, 1500V/µs slew rate, 3.6mA supply current - lower speed/power trade-off | Better suited for battery-powered portable instruments where thermal dissipation is constrained | Select when 220MHz bandwidth suffices and 3.6mA quiescent current is mandatory for >10-hour runtime |
| LT1395CS8#TRPBF | 400MHz GBW, 1000V/µs slew rate, 4.6mA supply current - current-feedback architecture | Requires careful feedback network design to avoid instability; not unity-gain stable | Choose for ultra-low distortion at high frequencies where input impedance matching is feasible |
Compared with LT1815CS8#TRPBF and LT1395CS8#TRPBF, the LT1818CS8#TRPBF uniquely combines 400MHz bandwidth, 2500V/µs slew rate, and unity-gain stability - making it the only option among the three that supports direct replacement in existing ADC driver layouts without feedback compensation redesign.
Availability
LT1818CS8#TRPBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, video signal conditioning equipment, communications receiver IF chains, and active filter designs requiring stable component supply across industrial and medical electronics programs.
Supply support for LT1818CS8#TRPBF 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 acquired Linear Technology in 2017 and maintains its legacy high-performance analog portfolio. Linear Technology specialized in precision, high-speed, and power management ICs for demanding signal chain applications.
The LT1818 series belongs to Linear Technology's high-speed operational amplifier product line, engineered specifically for wideband, low-distortion signal conditioning in data converters, video, and communications infrastructure where both DC accuracy and AC performance are critical.
FAQ
What is the maximum capacitive load the LT1818CS8#TRPBF can drive in unity-gain configuration without external compensation?
The LT1818CS8#TRPBF is unity-gain stable with up to 20pF capacitive load directly at the output. For loads exceeding 20pF, a 10Ω to 50Ω series isolation resistor must be placed between the output pin and the capacitive load to prevent ringing or oscillation, while feedback remains connected directly to the amplifier output. This behavior is validated in the manufacturer's application notes for ADC driver implementations.
Does the LT1818CS8#TRPBF support single-supply operation, and what is its output voltage swing under those conditions?
Yes, the LT1818CS8#TRPBF operates from a single 5V supply. With a 100Ω load referenced to 2.5V, the output swings from 1V to 4V - delivering 3V peak-to-peak amplitude. This rail-to-rail output capability enables direct interfacing with SAR and sigma-delta ADCs requiring single-supply analog front-ends, as confirmed in the device's electrical characteristics table for VS = 5V, 0V conditions.
How does the input bias current polarity behave in the LT1818CS8#TRPBF, and why is balanced source resistance recommended?
The LT1818CS8#TRPBF uses complementary NPN/PNP input transistors whose base currents oppose each other, resulting in low net input bias current. However, mismatch in transistor beta causes the net bias current polarity to vary between devices. Balanced source resistance (e.g., 100Ω at both +IN and –IN) converts the tightly controlled 800nA max input offset current into only 80µV added offset, whereas unbalanced sources could produce up to 0.8mV error from the 8µA max input bias current.
What thermal considerations apply to the LT1818CS8#TRPBF in SO-8 package when driving heavy loads?
The LT1818CS8#TRPBF in SO-8 package has θJA = 150°C/W. Under worst-case conditions - ±5V supplies, 85°C ambient, and 100Ω load - power dissipation reaches 202.5mW per amplifier, yielding a calculated junction temperature of 146°C. To maintain reliability, ensure adequate copper pour on V– pin and limit continuous output current to ≤35mA when ambient exceeds 70°C, as specified in the Absolute Maximum Ratings table.
Can the LT1818CS8#TRPBF be used as a comparator, and what limits this application?
No, the LT1818CS8#TRPBF is not intended for comparator use. Although its inputs withstand ±6V differential voltage transiently, sustained differential input voltages cause excessive internal current (up to 50mA) and power dissipation, risking junction temperature exceedance beyond 150°C. The device lacks comparator-specific features such as open-collector output, hysteresis control, or propagation delay optimization - all explicitly excluded from its design intent per the Applications Information section.
LT1818CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2500V/µs
- Gain Bandwidth Product:
- 400 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 9mA
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1818CS8#TRPBF FAQ
1.How can I place an order for LT1818CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1818CS8#TRPBF 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 LT1818CS8#TRPBF reliable?
The price and inventory of LT1818CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1818CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1818CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1818CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1818CS8#TRPBF?
LT1818CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1818CS8#TRPBF 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 LT1818CS8#TRPBF?
For technical support, including LT1818CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1818CS8#TRPBF requirements.
6.How does Aetrix verify that LT1818CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1818CS8#TRPBF 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 LT1818CS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1818CS8#TRPBF?
All LT1818CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1818CS8#TRPBF, 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 LT1818CS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1818CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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