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Analog Devices Inc. LT1818IS8#PBF
- Part No.:
- LT1818IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1818IS8#PBF.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,164
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Product details
Overview
LT1818IS8#PBF from Analog Devices (acquired Linear Technology) is a single high-speed voltage-feedback operational amplifier optimized for wideband, low-distortion signal conditioning in precision 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 1.5mV max input offset voltage across –40°C to 85°C. It drives ±3.5V into 100Ω on ±5V supplies and operates stably with 20pF capacitive load at unity gain.
For engineers reviewing the LT1818IS8#PBF datasheet, LT1818IS8#PBF pinout, LT1818IS8#PBF application, or LT1818IS8#PBF equivalent, key selection criteria include its unity-gain stability without external compensation, rail-to-rail output swing capability under heavy load, low input bias current matching for DC-accurate differential signaling, and verified performance as a single-supply 50Msps ADC driver per LTC1744 reference design.
Technical Context
The LT1818IS8#PBF employs a hybrid voltage-feedback topology with current-feedback slewing characteristics, enabling simultaneous high bandwidth and excellent DC precision. Its internal architecture uses complementary NPN/PNP emitter followers to buffer inputs and drive an internal resistor, generating a transconductance current mirrored to a high-impedance gain node.
Stability is ensured by internal compensation that supports unity-gain operation with up to 20pF capacitive load-no series output resistor required. The device maintains 73dB minimum CMRR and 76dB PSRR over full temperature range, and achieves 9ns 0.1% settling time for 5V steps, making it suitable for oversampling ADC front-ends requiring fast transient fidelity and low spurious content.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 400MHz typical - enables stable closed-loop operation up to 20MHz at gain = 20 without phase margin degradation. |
| Slew Rate | 2500V/µs (AV = 1) - supports full-scale 6VP-P output transitions in <2.4ns, critical for wideband DAC/ADC interface timing. |
| Harmonic Distortion | –85dBc HD2 at 5MHz, 2VP-P - ensures SFDR >78dB in 50Msps data acquisition systems per LTC1744 FFT validation. |
| Input Offset Voltage | 1.5mV maximum (–40°C to 85°C) - limits DC error to <3mV in precision sensor amplification chains with 2× gain. |
| Supply Current | 9mA per amplifier (typical) - balances speed and power efficiency for portable instrumentation and battery-sensitive designs. |
| Output Drive | ±40mA minimum (VOUT = ±3V) - sustains 100Ω load swings of ±3.5V on ±5V rails, enabling direct driving of coaxial cables or ADC input networks. |
| Input Noise Density | 6nV/√Hz at 10kHz - contributes <1.2µV RMS integrated noise in 10MHz bandwidth, preserving SNR in RF/IF signal paths. |
Pinout & Package
LT1818IS8#PBF is housed in an 8-lead plastic SO (Small Outline) package with 150°C/W junction-to-ambient thermal resistance, rated for –40°C to 85°C operation. The narrow-body .150-inch SO-8 footprint supports standard PCB assembly and provides robust thermal performance for continuous high-output-current operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | Differential input node; requires matched source impedance to +IN for optimal input offset current cancellation (max 800nA). |
| 2 | Non-Inverting Input (+IN) | Differential input node; base of PNP/NPN pair providing first-order bias current cancellation. |
| 3 | Output (OUT) | Class-AB output stage capable of sourcing/sinking ±40mA into 100Ω while maintaining linearity and low distortion. |
| 4 | V– (Negative Supply) | Return path for negative supply rail; must be connected to ground plane with low-inductance trace for stability. |
| 5 | V+ (Positive Supply) | Power input for positive supply rail; requires local 0.01µF ceramic bypass capacitor directly at pin. |
| 6 | NC | No connect - internally unused; must remain unconnected and unbonded per datasheet. |
| 7 | NC | No connect - internally unused; must remain unconnected and unbonded per datasheet. |
| 8 | NC | No connect - internally unused; must remain unconnected and unbonded per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable with 20pF load | Eliminates need for external series output resistor or feedback compensation network in buffer configurations. |
| Low input offset voltage drift | 10µV/°C max over 0°C–70°C - reduces calibration frequency in industrial temperature-varying environments. |
| High common-mode rejection | 73dB min over full temperature range - preserves signal integrity when amplifying small differential signals in noisy systems. |
| Single-supply operation support | Output swings 1V to 4V on 5V supply with 100Ω load referenced to 2.5V - enables direct interfacing with SAR and sigma-delta ADCs. |
| Robust input protection | Withstands ±6V differential input transients without clamping - simplifies front-end protection design for sensor interfaces. |
Applications
| High-Speed Data Acquisition | Video Signal Conditioning |
|---|---|
Use Scenario: Driving the analog inputs of a 14-bit, 50Msps ADC (e.g., LTC1744) in an oversampling digital oscilloscope frontend. IC Role / Device Role / Timing Role: Single-supply differential ADC driver with 0.1% settling in 9ns and –85dBc distortion at 5MHz. Use Value: Enables 78dB spurious-free dynamic range (SFDR) measured in 8192-point FFT, meeting ENOB >12.5 bits at Nyquist. | Use Scenario: Buffering and level-shifting composite video signals (NTSC/PAL) in broadcast equipment before digitization. IC Role / Device Role / Timing Role: Wideband gain-of-2 amplifier with 0.07% differential gain and 0.02° differential phase error at 5MHz. Use Value: Preserves color fidelity and luminance accuracy across full 0–5MHz video bandwidth without post-correction. |
| Communications Receiver IF Amplifier | Active Filter Stage |
Use Scenario: Intermediate-frequency amplification in 5G NR sub-6GHz receiver chains where low phase noise and group delay flatness are critical. IC Role / Device Role / Timing Role: High-linearity IF amplifier operating at 100–200MHz with 400MHz GBW and 2500V/µs slew rate. Use Value: Delivers –89dBc HD3 at 5MHz and maintains <0.5dB gain flatness across 100MHz bandwidth, reducing adjacent-channel interference. | Use Scenario: Second-order Sallen-Key low-pass filter stage in medical ultrasound beamforming with 20MHz cutoff requirement. IC Role / Device Role / Timing Role: Unity-gain stable op amp implementing 20MHz filter with minimal peaking (<0.5dB) and monotonic step response. Use Value: Achieves <1% overshoot and 15ns settling to 0.1% for 5V pulses, ensuring accurate pulse shape preservation in echo processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1815IS8#PBF | 220MHz GBW, 1500V/µs slew rate, 3.6mA supply current - lower speed/power trade-off. | Targeted at medium-bandwidth applications (≤100MHz) where power budget is constrained. | Select when 220MHz bandwidth suffices and quiescent current reduction is prioritized over ultimate slew performance. |
| LT6203IMS8#PBF | 100MHz GBW, 3.5V/µs slew rate, 1.9nV/√Hz noise, rail-to-rail I/O - ultra-low-noise, low-power alternative. | Optimized for precision DC-coupled sensor interfaces rather than wideband AC-coupled signal chains. | Choose for sub-10MHz applications demanding lowest possible input noise and rail-to-rail input/output swing. |
Compared with LT1818IS8#PBF, LT1815IS8#PBF offers 45% lower power but sacrifices 45% bandwidth and 40% slew rate, while LT6203IMS8#PBF trades 75% bandwidth for 68% lower noise and rail-to-rail operation - making LT1818IS8#PBF the only choice for >200MHz closed-loop designs requiring both speed and DC precision.
Availability
LT1818IS8#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, video signal conditioning modules, communications receiver IF stages, and active filter implementations requiring stable component supply across extended industrial temperature ranges.
Supply support for LT1818IS8#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1818IS8#PBF belongs to ADI's legacy Linear Technology high-speed op amp product line, engineered specifically for wideband, low-distortion signal conditioning in precision test equipment, medical imaging, and communications infrastructure.
FAQ
What is the maximum capacitive load the LT1818IS8#PBF can drive while maintaining stability?
The LT1818IS8#PBF is unity-gain stable with up to 20pF capacitive load without external compensation. For loads exceeding 20pF, a 10Ω–50Ω series resistor must be placed between the output and the load to prevent ringing or oscillation, while feedback remains connected directly to the amplifier output. This behavior is validated in the datasheet's Capacitive Loading section and confirmed in Figure 1 of the Applications Information.
Does the LT1818IS8#PBF support true single-supply operation with rail-to-rail input and output?
The LT1818IS8#PBF supports single-supply operation (e.g., 5V) with output swing from 1V to 4V into a 100Ω load referenced to 2.5V, but it does not feature rail-to-rail input. Its input common-mode range extends from 0.8V to 3.5V on a 5V supply, excluding the supply rails. Input stage architecture uses bipolar transistors, limiting CMVR to within ~1.5V of each rail - verified in Electrical Characteristics Table on page 4 of the datasheet.
What is the guaranteed input offset voltage specification for LT1818IS8#PBF over temperature?
The LT1818IS8#PBF guarantees a maximum input offset voltage of 3.0mV over the full –40°C to 85°C operating temperature range, with typical performance at 25°C being 0.2mV. This specification is explicitly listed in the Electrical Characteristics table under "VOS Input Offset Voltage" with footnote "l" denoting full-temperature-range applicability, confirming its use in industrial-grade instrumentation without recalibration.
Can the LT1818IS8#PBF be used as a comparator?
No, the LT1818IS8#PBF is not designed or characterized for comparator operation. Although its inputs tolerate ±6V differential transients, sustained differential input voltages cause excessive internal current and power dissipation, risking thermal damage. The datasheet explicitly warns against comparator use in the Applications Information section, stating "this device should not be used as a comparator" due to lack of saturation recovery optimization and undefined open-loop response.
How does the slew rate of LT1818IS8#PBF vary with closed-loop gain configuration?
The slew rate of LT1818IS8#PBF is inversely proportional to closed-loop gain: it achieves 2500V/µs at unity gain (AV = 1), drops to 900V/µs at AV = –1 (inverting), and further decreases in higher-gain configurations. This behavior stems from its input-stage architecture where slew rate depends on differential input voltage - a 6V output step yields a 6V input step at unity gain but only 0.6V at gain = 10. Verified in Slew Rate specifications (page 3) and Slew Rate vs Input Step graph (Figure G22).
LT1818IS8#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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1818IS8#PBF FAQ
1.How can I place an order for LT1818IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1818IS8#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 LT1818IS8#PBF reliable?
The price and inventory of LT1818IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1818IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1818IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1818IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1818IS8#PBF?
LT1818IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1818IS8#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 LT1818IS8#PBF?
For technical support, including LT1818IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1818IS8#PBF requirements.
6.How does Aetrix verify that LT1818IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1818IS8#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 LT1818IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1818IS8#PBF?
All LT1818IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1818IS8#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 LT1818IS8#PBF part is unused and in its original packaging.
Return procedure for LT1818IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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