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Analog Devices Inc. LT1818CS8#PBF
- Part No.:
- LT1818CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1818CS8#PBF.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:394
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Product details
Overview
LT1818CS8#PBF from Analog Devices (acquired Linear Technology) is a single high-speed voltage-feedback operational amplifier optimized for wideband, low-distortion signal conditioning. It delivers 400MHz gain-bandwidth product, 2500V/µs slew rate, 6nV/√Hz input noise, ±3.5V input common-mode range at ±5V supplies, and drives ±3.5V into 100Ω with ±5V supplies - making it suitable for high-fidelity ADC driver, video buffer, and RF intermediate-stage amplification.
For engineers reviewing the LT1818CS8#PBF datasheet, LT1818CS8#PBF pinout, LT1818CS8#PBF application, or LT1818CS8#PBF equivalent, key selection criteria include unity-gain stability with 20pF capacitive load, –85dBc harmonic distortion at 5MHz (AV = 2), 9mA supply current per amplifier, 1.5mV max input offset voltage (0°C to 70°C), and SO-8 package compatibility with industrial temperature-limited designs.
Technical Context
The LT1818CS8#PBF employs a hybrid voltage-feedback architecture with current-feedback slewing characteristics, enabling both precision DC performance and high-frequency transient response. Its complementary NPN/PNP input stage provides first-order bias current cancellation while maintaining low input offset voltage and tight offset drift (10μV/°C typ).
It operates from ±1.25V to ±5.5V dual supplies or 4V to 11V single supply, supports rail-to-rail output swing under load (e.g., 1V to 4V on 5V supply with 100Ω load to 2.5V), and remains stable without series output resistance up to 20pF capacitive loading in unity-gain configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 400MHz typical - enables stable closed-loop operation up to ~350MHz at AV = 1 with phase margin >40°. |
| Slew Rate | 2500V/µs (AV = 1) - supports full-scale 6Vpp step response in <2.5ns, critical for oversampling ADC drivers. |
| Input Noise Voltage | 6nV/√Hz at 10kHz - preserves SNR in front-end amplification of low-level signals like sensor outputs or IF stages. |
| Harmonic Distortion | –85dBc HD2 at 5MHz (AV = 2, 2Vpp) - meets SFDR requirements in 14-bit, 50Msps data acquisition systems. |
| Supply Current | 9mA per amplifier (0°C to 70°C) - balances speed and power for portable or thermally constrained instrumentation. |
| Input Offset Voltage | 1.5mV maximum (0°C to 70°C) - ensures ≤0.3% gain error in precision DC-coupled gain blocks. |
| Output Drive | ±40mA minimum (VOUT = ±3V) - sustains 100Ω load swings without clipping in active filter or cable driver topologies. |
Pinout & Package
LT1818CS8#PBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150-inch body width, with standard JEDEC MS-012AC footprint and 1.27mm lead pitch. Thermal resistance θJA = 150°C/W with short PCB traces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unused; must be left floating or tied to ground per layout best practice. |
| 2 (–IN) | Inverting Input | Differential input node; requires matched trace length and impedance control to minimize distortion. |
| 3 (+IN) | Non-Inverting Input | High-impedance input (1.5MΩ differential); sensitive to parasitic capacitance - keep short and guarded. |
| 4 (V–) | Negative Supply Rail | Return path for internal bias and output stage; connect directly to low-impedance ground plane. |
| 5 (OUT) | Amplifier Output | Capable of sourcing/sinking ±40mA; place 0.01μF ceramic bypass capacitor within 2mm. |
| 6 (NC) | No Connect | Internally unused; no external connection required. |
| 7 (NC) | No Connect | Internally unused; no external connection required. |
| 8 (V+) | Positive Supply Rail | Primary power input; bypass with 0.01μF ceramic + optional 1–10μF tantalum for high-current transients. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable with 20pF load | Eliminates need for isolation resistor in capacitive-load applications (e.g., ADC input filtering), reducing component count and board space. |
| Low input offset drift | 10μV/°C typical over 0°C to 70°C - maintains calibration integrity across ambient temperature shifts in test equipment. |
| Single-supply operation support | Operates from 4V to 11V single supply with rail-to-rail output swing (1V to 4V on 5V supply into 100Ω), simplifying power architecture in portable systems. |
| High channel separation | 82dB typical (LT1819 dual version) - confirms robust internal isolation; validates suitability for dual-channel synchronous sampling front ends. |
| Robust input protection | Withstands ±6V differential input transients without damage - enables direct interface with unclamped signal sources in industrial I/O modules. |
Applications
| Video Line Driver | High-Speed Data Acquisition Front End |
|---|---|
Use Scenario: Driving 75Ω coaxial video lines in broadcast-grade analog video routing switchers. IC Role / Device Role / Timing Role: Unity-gain buffer with low group delay variation (<10ps over 10MHz) and minimal differential gain/phase error (0.07%/0.02°). Use Value: Preserves color fidelity and timing alignment across multiple video paths without requiring post-compensation circuitry. | Use Scenario: Single-supply differential driver for 14-bit, 50Msps ADCs (e.g., LTC1744) in medical ultrasound beamformers. IC Role / Device Role / Timing Role: Converts single-ended baseband signals to balanced differential pairs with 81dB SFDR at 5MHz input. Use Value: Enables >12 effective bits of resolution at Nyquist without external trimming or calibration. |
| RF Intermediate Frequency Amplifier | Active Filter Stage in Communications Receiver |
Use Scenario: 70MHz IF amplification stage in SDR receivers before quadrature demodulation. IC Role / Device Role / Timing Role: Fixed-gain (20dB) non-inverting amplifier with flat 80MHz bandwidth and –72dBc HD3 at 5MHz. Use Value: Maintains adjacent-channel rejection and prevents intermodulation distortion from degrading receiver selectivity. | Use Scenario: Second-order low-pass filter section in LTE baseband receive chain with cutoff at 20MHz. IC Role / Device Role / Timing Role: High-Q active integrator in MFB topology, leveraging 400MHz GBW to sustain loop stability up to 15MHz. Use Value: Achieves >60dB stopband attenuation at 40MHz without passive inductors or trimming components. |
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#PBF | 220MHz GBW, 1500V/µs slew rate, 3.6mA supply current - lower speed/power trade-off. | Better suited for battery-powered portable instruments where thermal budget limits 9mA draw. | Select when full 400MHz bandwidth is unnecessary and quiescent power reduction is prioritized. |
| LT1807CS8#PBF | Rail-to-rail input/output, 325MHz GBW, 140V/µs slew rate, 3.5nV/√Hz noise - wider VCM but slower slew. | Ideal for single-supply sensor interfaces requiring full input voltage range (0V to Vs) and ultra-low noise. | Choose when DC accuracy and rail-to-rail operation outweigh raw slew rate requirements. |
Compared with LT1815CS8#PBF and LT1807CS8#PBF, the LT1818CS8#PBF uniquely combines 400MHz bandwidth and 2500V/µs slew rate in an SO-8 package - making it the only option among the three capable of driving 100Ω loads with sub-10ns settling to 0.1% in unity-gain configurations.
Availability
LT1818CS8#PBF is available at Aetrix Electronics and suitable for video line driving, high-speed data acquisition front ends, RF intermediate frequency amplification, and active filter design requiring stable component supply across prototyping, pilot production, and volume manufacturing phases.
Supply support for LT1818CS8#PBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1818CS8#PBF belongs to ADI's legacy Linear Technology high-speed op amp portfolio, engineered specifically for demanding wideband signal conditioning in instrumentation, medical imaging, and communications infrastructure where speed, linearity, and low noise are co-critical.
FAQ
What is the maximum capacitive load the LT1818CS8#PBF can drive in unity-gain configuration without external compensation?
The LT1818CS8#PBF is unity-gain stable with up to 20pF capacitive load without requiring a series isolation resistor. This capability is verified per datasheet Figure 1 and Application Information section, enabling direct connection to ADC input filters or coaxial cable stubs without added components. Exceeding 20pF necessitates a 10Ω–50Ω series resistor at the output to maintain stability.
Does the LT1818CS8#PBF support true single-supply operation with rail-to-rail input and output?
The LT1818CS8#PBF supports single-supply operation from 4V to 11V but does not feature rail-to-rail input. Its input common-mode range extends from 0.8V to 3.5V on a 5V supply (V– = 0V, V+ = 5V), and output swings from 1V to 4V into 100Ω. While not rail-to-rail, this range accommodates most single-supply ADC driver and active filter use cases without level-shifting circuitry.
What is the guaranteed input offset voltage specification for LT1818CS8#PBF over its rated temperature range?
The LT1818CS8#PBF guarantees a maximum input offset voltage of 2.0mV over its specified operating temperature range of 0°C to 70°C. At extended temperatures (–40°C to 85°C), the limit increases to 3.0mV. These values are production-tested and documented in the Electrical Characteristics table on page 3 of the LT1818/LT1819 datasheet.
Can the LT1818CS8#PBF be used as a comparator?
No - the LT1818CS8#PBF is not designed or characterized for comparator operation. Its inputs tolerate ±6V differential transients but sustained differential inputs cause excessive internal power dissipation and potential damage. The device lacks internal hysteresis, propagation delay specs, or open-collector output required for reliable comparator use. Dedicated comparators (e.g., LT1719) should be selected instead.
How does the slew rate of LT1818CS8#PBF vary with closed-loop gain configuration?
The LT1818CS8#PBF exhibits gain-dependent slew rate: 2500V/µs at AV = 1 (non-inverting), 900V/µs at AV = –1 (inverting), and lower values at higher gains. This behavior arises from its input-stage architecture where slew rate is proportional to differential input voltage. Thus, for fastest transient response, unity-gain or low-gain configurations are optimal - a key consideration in ADC driver and pulse amplification designs using LT1818CS8#PBF.
LT1818CS8#PBF 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:
- 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#PBF FAQ
1.How can I place an order for LT1818CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1818CS8#PBF 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#PBF reliable?
The price and inventory of LT1818CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1818CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1818CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1818CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1818CS8#PBF?
LT1818CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1818CS8#PBF 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#PBF?
For technical support, including LT1818CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1818CS8#PBF requirements.
6.How does Aetrix verify that LT1818CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1818CS8#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT1818CS8#PBF?
All LT1818CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1818CS8#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT1818CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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