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Analog Devices Inc. LT1227CS8#PBF
- Part No.:
- LT1227CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Video Amps and Modules
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1227CS8#PBF.pdf
- Description:
- IC AMP CURRENT FEEDBACK 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:197
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Product details
Overview
LT1227CS8#PBF from Analog Devices (formerly Linear Technology) is a high-speed current feedback amplifier optimized for video cable driving, delivering 140MHz bandwidth at AV = 2 into 150Ω, 1100V/µs slew rate, and 30mA output drive. It features 0.01% differential gain and 0.01° differential phase for NTSC composite video, operates from ±2V to ±15V supplies, and includes shutdown mode with <250µA supply current.
For engineers reviewing the LT1227CS8#PBF datasheet, LT1227CS8#PBF pinout, LT1227CS8#PBF application, or LT1227CS8#PBF equivalent, this page provides verified specifications, SO-8 package terminal mapping, video-system design context, and two validated alternative current feedback amplifiers for RGB/cable driver upgrades.
Technical Context
The LT1227CS8#PBF uses a current feedback architecture where bandwidth remains stable across voltage gains-unlike voltage-feedback op amps-enabling consistent 140MHz small-signal bandwidth at AV = 2 with RF = 1kΩ and RL = 150Ω. Its input stage presents high impedance (14MΩ || 3pF), while the output drives heavy capacitive loads when paired with appropriate feedback resistors (e.g., ≥1kΩ for ≤5dB peaking).
Shutdown is controlled via Pin 8 (SHDN), referenced to V+, requiring >50µA sink current to activate; transition time is 4µs. In shutdown, output impedance rises to ~12pF, isolation reaches 70dB at 10MHz, and supply current drops to ≤500µA, enabling parallel MUX configurations without loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 140MHz at AV = 2, RL = 150Ω - enables full NTSC/PAL baseband video signal integrity up to 10MHz with margin. |
| Slew Rate | 1100V/µs - supports clean 10VP-P video signals at 10MHz without slewing distortion. |
| Differential Gain / Phase | 0.01% / 0.01° at 3.58MHz - meets broadcast-grade video fidelity requirements for RGB and composite systems. |
| Output Drive | 30mA continuous - directly drives 75Ω coaxial cables and multiple parallel loads without external buffers. |
| Supply Range | ±2V to ±15V - supports single-supply AC-coupled designs (e.g., +5V with biasing) and dual-rail industrial video equipment. |
| Shutdown Current | ≤500µA - reduces system power by >95% during inactive channels in multi-amplifier MUX architectures. |
| Input Impedance | 14MΩ || 3pF - minimizes loading on preceding stages (e.g., DAC outputs or filter networks) in precision signal chains. |
Pinout & Package
LT1227CS8#PBF is housed in an 8-lead plastic SOIC (SO-8, narrow 0.150") package per JEDEC MS-012, with industry-standard pinout compatible with legacy video op amps for drop-in replacement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (IN–) | Connects to internal inverting input bias network; used with Pin 5 and external pot to null input offset voltage or bias current. |
| 2 | Inverting Input (–IN) | Current-summing node for feedback; requires low-stray-capacitance PCB layout to avoid peaking/overshoot. |
| 3 | Noninverting Input (+IN) | High-impedance input (14MΩ || 3pF); common-mode range extends to within 1.5V of either supply rail. |
| 4 | Negative Supply (V–) | Accepts –2V to –15V; supplies internal bias circuits and output stage; must be decoupled locally. |
| 5 | Offset Null (IN+) | Reference point for offset adjustment circuitry; tied to V+ for nulling configuration per datasheet Figure TA12. |
| 6 | Shutdown (SHDN) | Active-low control referenced to V+; sinking >50µA places device in high-Z, low-IQ state; open-drain logic compatible. |
| 7 | Positive Supply (V+) | Accepts +2V to +15V; powers input and output stages; thermal performance depends on θJA = 100°C/W (SO-8). |
| 8 | Output (OUT) | Capable of ±13.5V swing into 400Ω; delivers 30mA into short circuit; output impedance <1Ω below 10MHz in active mode. |
Key Features
| Feature | Design Value |
|---|---|
| Current Feedback Architecture | Maintains 140MHz bandwidth from AV = 1 to AV = 10, eliminating gain-bandwidth trade-off in video gain blocks. |
| Video-Optimized Linearity | 0.01% differential gain and 0.01° differential phase at 3.58MHz ensure broadcast-compliant color fidelity in RGB and composite systems. |
| Robust Cable Driving | 30mA output current and 1100V/µs slew rate enable direct 75Ω coaxial cable termination without external buffers or level-shifting. |
| Fast Shutdown Switching | 4µs enable/disable time and 70dB input-to-output isolation at 10MHz support high-speed analog MUX applications with minimal crosstalk. |
| Wide Supply Flexibility | Operates from ±2V to ±15V; inputs common-mode to within 1.5V of rails and outputs swing to within 0.8V-ideal for low-voltage portable video and high-voltage broadcast gear. |
Applications
| RGB Video Amplifier | Cable Driver for Broadcast Equipment |
|---|---|
Use Scenario: Amplifying red, green, and blue analog video signals in professional monitors and video switchers before transmission over 75Ω coaxial cables. IC Role / Device Role / Timing Role: Current feedback amplifier configured as unity-gain buffer or gain-of-2 driver, maintaining DC coupling and sub-degree phase matching across channels. Use Value: 0.01° differential phase ensures no visible color skew between RGB channels at 3.58MHz; 140MHz bandwidth preserves sharp edge transitions in HD-ready signals. | Use Scenario: Driving long-haul 75Ω video cables in CCTV matrix switchers and broadcast routing systems where signal integrity degrades due to capacitance and loss. IC Role / Device Role / Timing Role: High-current output stage compensating for cable attenuation; shutdown mode enables channel selection without physical relays. Use Value: 30mA drive current sustains 1VP-P signal over 100m of RG-59; 4µs shutdown switching allows frame-accurate source switching in real-time video routers. |
| Test Equipment Signal Generator Output Stage | NTSC Composite Video Reconstruction |
Use Scenario: Final output buffer in automated test equipment generating calibrated video waveforms (e.g., color bars, sweep patterns) for display calibration. IC Role / Device Role / Timing Role: Precision gain block with low THD (<0.01% at 1MHz) and flat group delay, ensuring waveform fidelity across frequency sweep. Use Value: 1100V/µs slew rate prevents rise-time degradation on 10VP-P square waves; 140MHz bandwidth captures third harmonic of 40MHz test signals. | Use Scenario: Reconstructing NTSC composite video after decoding or processing, where luminance/chrominance timing alignment is critical. IC Role / Device Role / Timing Role: Final reconstruction amplifier restoring signal amplitude and phase relationships prior to CRT or analog monitor interface. Use Value: 0.01% differential gain prevents saturation-induced color desaturation; 0.01° differential phase avoids hue shifts in flesh tones at 3.58MHz subcarrier. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1395CS6#TRMPBF | 400MHz bandwidth, SOT-23-6 package, higher slew rate (2000V/µs), but lower output drive (15mA) and no shutdown pin. | Better for ultra-high-frequency small-signal buffering (e.g., ADC front-end), unsuitable for 75Ω cable driving or MUX architectures. | Select LT1395CS6#TRMPBF only when bandwidth >200MHz is required and load current <15mA; retain LT1227CS8#PBF for video cable drive or shutdown-enabled systems. |
| ADA4870ARZ | High-voltage (±20V), 1000V/µs slew rate, 1000mA output drive, but 100MHz bandwidth and no integrated shutdown. | Targeted at high-power pulse amplification (e.g., laser diode drivers), not video linearity-critical applications. | Choose ADA4870ARZ only for high-current, high-voltage pulse applications; LT1227CS8#PBF remains optimal for broadcast video fidelity and MUX integration. |
Compared with LT1395CS6#TRMPBF and ADA4870ARZ, the LT1227CS8#PBF uniquely balances 140MHz bandwidth, 30mA drive, 0.01° phase accuracy, and integrated shutdown-making it irreplaceable in cost-sensitive, high-fidelity video distribution systems requiring channel selection.
Availability
LT1227CS8#PBF is available at Aetrix Electronics and suitable for RGB video amplifiers, broadcast cable drivers, test equipment signal generators, and NTSC composite reconstruction systems requiring stable component supply and long-term obsolescence management.
Supply support for LT1227CS8#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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application notes for legacy Linear parts including the LT1227 series.
The LT1227CS8#PBF belongs to Linear Technology's high-speed current feedback amplifier product line, designed specifically for video signal conditioning, cable driving, and precision analog MUX applications where bandwidth, linearity, and fast enable/disable response are critical.
FAQ
What is the maximum capacitive load the LT1227CS8#PBF can drive stably?
The LT1227CS8#PBF can drive up to 10,000pF with a 10kΩ feedback resistor (per TPC10 curve), but stability depends on feedback resistor value and gain. For 5dB peaking worst-case (AV = 2, RL = 1kΩ), use ≥1kΩ RF with ≤1000pF load. Adding a 10–20Ω series resistor at the output isolates heavier capacitive loads without compromising bandwidth in unloaded conditions. Always verify phase margin with actual layout parasitics.
Does the LT1227CS8#PBF support single-supply operation?
Yes, the LT1227CS8#PBF operates from total supply voltages as low as 4V (±2V) and supports true single-supply configurations. For +5V operation, AC-couple inputs and bias the +IN pin to mid-rail (e.g., 2.5V) using resistive dividers; output swings within 0.8V of rails, yielding ~4.2VPP dynamic range. Datasheet Figures TA08 and TA09 provide verified single-supply schematics for inverting and noninverting modes.
How does shutdown affect the LT1227CS8#PBF's output impedance and isolation?
In shutdown mode (Pin 8 pulled low), the LT1227CS8#PBF output presents ~12pF capacitance with >100MΩ DC resistance, and input-to-output isolation reaches 70dB at 10MHz for 10VP-P signals. This high-Z state prevents loading of downstream stages and enables parallel connection of multiple LT1227CS8#PBF devices in MUX topologies without signal contention or crosstalk degradation.
Can the LT1227CS8#PBF replace older video op amps like the LM1889 or EL2020?
Yes-the LT1227CS8#PBF uses the industry-standard SO-8 pinout and offers superior performance versus LM1889 (10MHz BW, 100V/µs) and EL2020 (100MHz BW, 500V/µs). Its 140MHz bandwidth, 1100V/µs slew rate, and 0.01° differential phase exceed both, while maintaining compatibility with existing PCB footprints and feedback networks. No layout changes are required for most upgrade paths.
What is the thermal limit and package dissipation capability of the LT1227CS8#PBF?
The LT1227CS8#PBF SO-8 package has a junction-to-ambient thermal resistance (θJA) of 100°C/W. With a maximum junction temperature of 150°C and ambient up to 70°C, allowable power dissipation is 0.8W. At ±15V supplies and 10mA quiescent current, static dissipation is 0.3W; under full 30mA load, dissipation rises to ~0.45W. Ensure ≥1cm² copper pour under the exposed pad (if present) or adjacent traces for reliable operation at full output.
LT1227CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Current Feedback
- Output Type:
- -
- Number of Circuits:
- 1
- -3db Bandwidth:
- 140 MHz
- Slew Rate:
- 1100V/µs
- Current - Supply:
- 10 mA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply, Single/Dual (±):
- 4V ~ 30V, ±2V ~ 15V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SO
LT1227CS8#PBF FAQ
1.How can I place an order for LT1227CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1227CS8#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 LT1227CS8#PBF reliable?
The price and inventory of LT1227CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1227CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1227CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1227CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1227CS8#PBF?
LT1227CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1227CS8#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 LT1227CS8#PBF?
For technical support, including LT1227CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1227CS8#PBF requirements.
6.How does Aetrix verify that LT1227CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1227CS8#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 LT1227CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1227CS8#PBF?
All LT1227CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1227CS8#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 LT1227CS8#PBF part is unused and in its original packaging.
Return procedure for LT1227CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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