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Analog Devices Inc. LT1229CS8#PBF
- Part No.:
- LT1229CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1229CS8#PBF.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:154
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Product details
Overview
LT1229CS8#PBF from Analog Devices (formerly Linear Technology) is a dual 100MHz current feedback amplifier in an 8-lead SOIC package, featuring 1000V/µs slew rate, ±2V to ±15V supply range, 30mA output drive, and 0.04% differential gain for video applications. It serves as a high-speed buffer and cable driver in RGB and composite video signal paths.
For engineers reviewing the LT1229CS8#PBF datasheet, LT1229CS8#PBF pinout, LT1229CS8#PBF application, or LT1229CS8#PBF equivalent, key selection criteria include closed-loop bandwidth stability across gains ≥2, input common-mode range within 1.5V of rails, output swing within 0.8V of supplies, and thermal performance in SO8 packages at 70°C ambient.
Technical Context
The LT1229CS8#PBF employs a current feedback architecture with high-impedance noninverting input (25MΩ, 3pF) and low-impedance inverting input, enabling constant bandwidth over voltage gains from 2 to 100 when using resistive feedback networks. Its transresistance gain (100–200kΩ) and fast internal node settling support sub-45ns 0.1% settling time.
It operates on split supplies from ±2V to ±15V (or single 4V–30V), with input common-mode range extending to within 1.5V of either rail and outputs swinging to within 0.8V of supplies into 400Ω loads. Supply current is 6mA per amplifier at 25°C with negative temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 100MHz small-signal –3dB BW at G = 2, RL = 100Ω, RF = RG = 750Ω; maintains >10MHz even at G = 100. |
| Slew Rate | 2500V/µs (overdriven inverting mode); 300–700V/µs typical under standard test conditions. |
| Output Drive | 30mA continuous output current; drives 150Ω video cables with 0.04% differential gain and 0.1° phase error. |
| Input Impedance | 25MΩ || 3pF at noninverting input; enables high-Z buffering without loading source circuits. |
| Supply Range | ±2V to ±15V (4V–30V total); supports single-supply 5V operation with proper DC biasing. |
| Settling Time | 45ns to 0.1% for 10V step; thermal settling tail <1mV/V ensures stable video waveform fidelity. |
| CMRR | 55–69dB over full temp range; sufficient for analog video gain stages where common-mode rejection is critical. |
Pinout & Package
LT1229CS8#PBF is housed in an 8-lead plastic SOIC (S8) package, 150°C/W junction-to-ambient thermal resistance in still air, JEDEC MS-012AC compliant, body size 3.9mm × 4.9mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A (–IN A) | Current-summing node for amplifier A; requires resistive feedback for stability; sensitive to stray capacitance. |
| 2 | Noninverting Input A (+IN A) | High-impedance voltage-sensing node; common-mode range extends to within 1.5V of supplies. |
| 3 | Output A (OUT A) | Class-AB output stage capable of ±12V swing into 400Ω; optimized for low-impedance cable driving. |
| 4 | Negative Supply (V–) | Power rail connection; supports asymmetric supplies; mismatch shifts offset by ~350µV/V. |
| 5 | Positive Supply (V+) | Power rail connection; quiescent current decreases with rising temperature (negative TC). |
| 6 | Noninverting Input B (+IN B) | Independent high-Z input for second amplifier; no shared circuitry between channels. |
| 7 | Inverting Input B (–IN B) | Second current-summing node; crosstalk to channel A is >65dB at 10MHz on well-laid PCBs. |
| 8 | Output B (OUT B) | Independent output; 100dB channel isolation enables dual-channel video processing without interference. |
Key Features
| Feature | Design Value |
|---|---|
| Current feedback topology | Maintains 100MHz bandwidth across closed-loop gains of 2–100, unlike voltage-feedback op-amps whose GBW collapses with gain. |
| Video-optimized linearity | 0.04% differential gain / 0.1° differential phase error at NTSC composite video levels (2VP, RL = 150Ω). |
| Wide supply flexibility | Operates from ±2V to ±15V; validated for single 5V supply with external DC bias networks (e.g., TA11 circuit). |
| Thermally robust SO8 layout | Specified max supply voltage of ±10.6V at 70°C ambient in S8 package, based on 0.533W max power dissipation. |
| Low inter-channel crosstalk | ≥100dB up to 100kHz, >65dB at 10MHz-enables independent dual-channel amplification without signal coupling. |
Applications
| RGB Video Amplifier | Cable Driver for Composite Video |
|---|---|
Use Scenario: Amplifying red, green, and blue analog signals in LCD monitor or projector front-end before DAC or display interface. IC Role / Device Role / Timing Role: Dual-channel buffer and level-shifter ensuring matched gain/phase across color channels with minimal skew. Use Value: 0.04% differential gain preserves color fidelity; 100MHz bandwidth supports UXGA (1600×1200@60Hz) pixel rates. | Use Scenario: Driving 75Ω coaxial cable in broadcast-quality composite video distribution systems. IC Role / Device Role / Timing Role: High-current output stage delivering 2VP-P into double-terminated 75Ω load with minimal overshoot. Use Value: 30mA drive capability sustains signal integrity over 100m cable runs; low THD (<0.01% at 1MHz) prevents ghosting. |
| Test Equipment Signal Conditioning | High-Speed Instrumentation Buffer |
Use Scenario: Front-end gain block in oscilloscope vertical amplifiers or arbitrary waveform generator output stages. IC Role / Device Role / Timing Role: Wideband voltage-controlled current source providing precise gain control and fast transient response. Use Value: 45ns 0.1% settling enables accurate pulse amplitude measurement; 1000V/µs slew rate captures fast edges without distortion. | Use Scenario: Isolating high-impedance sensor outputs (e.g., photodiode transimpedance stages) from noisy downstream circuitry. IC Role / Device Role / Timing Role: Unity-gain buffer preserving signal integrity while rejecting supply noise via 80dB PSRR. Use Value: 25MΩ input impedance prevents sensor loading; 69dB CMRR rejects common-mode interference in industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1227CS8#PBF | Single-channel version; identical bandwidth (140MHz), higher slew rate (1500V/µs), same SO8 package. | Requires two devices for dual-channel use; better suited for space-constrained single-channel designs. | Select LT1227CS8#PBF only when dual-channel integration is unnecessary and higher slew rate is prioritized. |
| LT1395CS6#TRMPBF | SOT-23-6 single CFA; 400MHz bandwidth, 1000V/µs slew, lower supply current (3.5mA), but no dual-channel option. | Not pin-compatible; requires PCB redesign; optimized for ultra-compact portable instrumentation. | Choose LT1395CS6#TRMPBF only for new designs targeting miniaturization and higher bandwidth, not drop-in replacement. |
Compared with LT1229CS8#PBF, LT1227CS8#PBF offers higher speed in half the channel count and footprint, while LT1395CS6#TRMPBF trades integration and thermal robustness for extreme bandwidth and size reduction-neither is pin-compatible, but both serve overlapping high-speed analog signal path roles.
Availability
LT1229CS8#PBF is available at Aetrix Electronics and suitable for RGB video amplification, composite video cable driving, and test equipment signal conditioning requiring stable component supply across commercial temperature range (0°C to 70°C).
Supply support for LT1229CS8#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 its precision analog portfolio, emphasizing high-performance amplifiers, data converters, and power management ICs for demanding signal chain applications.
The LT1229CS8#PBF belongs to Linear's current feedback amplifier product line, engineered specifically for wideband video, instrumentation, and high-speed signal routing where gain-bandwidth independence and cable drive capability are essential.
FAQ
What is the maximum supply voltage for LT1229CS8#PBF in a 70°C ambient environment?
The LT1229CS8#PBF has a maximum recommended supply voltage of ±10.6V (21.2V total) when operating at 70°C ambient in its SO8 package, based on thermal limits of 0.533W max power dissipation and 150°C/W junction-to-ambient thermal resistance. Exceeding this risks junction temperature exceeding 150°C.
Does LT1229CS8#PBF support single-supply operation?
Yes, LT1229CS8#PBF supports single-supply operation down to 4V total (e.g., +5V with ground). Application Note TA11 demonstrates a 5V composite video driver using external DC biasing to maintain input/output headroom; input common-mode range extends to within 1.5V of either rail.
What is the small-signal rise time of LT1229CS8#PBF under standard test conditions?
The LT1229CS8#PBF achieves a small-signal rise time of 3.5ns (10% to 90%) when configured with RF = RG = 750Ω, RL = 100Ω, and ±15V supplies-consistent with its 100MHz small-signal bandwidth and optimized for high-frequency video and test signal fidelity.
How does LT1229CS8#PBF compare to voltage-feedback op-amps in bandwidth vs. gain behavior?
Unlike voltage-feedback op-amps whose bandwidth drops inversely with closed-loop gain (GBW constant), the LT1229CS8#PBF maintains ~100MHz bandwidth from G = 2 to G = 10 due to its current feedback architecture-enabling consistent high-speed performance across multiple gain settings without sacrificing bandwidth.
Can LT1229CS8#PBF drive capacitive loads directly?
Yes, LT1229CS8#PBF can drive capacitive loads directly when using appropriate feedback resistor values per the "Maximum Capacitive Load vs Feedback Resistor" curve in the datasheet; for worst-case 1kΩ load at G = 2, up to 10,000pF is supported with ≤5dB peaking. Adding a 10–20Ω series resistor at the output provides additional isolation if needed.
LT1229CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 700V/µs
- Gain Bandwidth Product:
- 100 MHz
- -3db Bandwidth:
- 100 MHz
- Current - Input Bias:
- 10 µA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 6mA (x2 Channels)
- Current - Output / Channel:
- 125 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1229CS8#PBF FAQ
1.How can I place an order for LT1229CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1229CS8#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 LT1229CS8#PBF reliable?
The price and inventory of LT1229CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1229CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1229CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1229CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1229CS8#PBF?
LT1229CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1229CS8#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 LT1229CS8#PBF?
For technical support, including LT1229CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1229CS8#PBF requirements.
6.How does Aetrix verify that LT1229CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1229CS8#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 LT1229CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1229CS8#PBF?
All LT1229CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1229CS8#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 LT1229CS8#PBF part is unused and in its original packaging.
Return procedure for LT1229CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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