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Analog Devices Inc. LT1229CN8#PBF
- Part No.:
- LT1229CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1229CN8#PBF.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,738
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Product details
Overview
LT1229CN8#PBF from Analog Devices (formerly Linear Technology) is a dual 100MHz current feedback amplifier in an 8-pin plastic DIP package, featuring 1000V/µs slew rate, ±2V to ±15V supply range, 30mA output drive, and 0.04% differential gain for video signal conditioning. It serves as a high-speed buffer and cable driver in RGB and composite video systems.
For engineers reviewing the LT1229CN8#PBF datasheet, LT1229CN8#PBF pinout, LT1229CN8#PBF application, or LT1229CN8#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 under 70°C ambient with ±15V operation.
Technical Context
The LT1229CN8#PBF uses a current feedback architecture with high-impedance noninverting input (25MΩ, 3pF) and low-impedance inverting input, enabling stable wideband operation independent of closed-loop voltage gain. Its transresistance gain stage delivers consistent 100MHz small-signal bandwidth at gain = 2 with RF = RG = 750Ω and RL = 100Ω.
Internal biasing supports rail-to-rail input common-mode range (±13.5V on ±15V supplies) and output swing (±13.5V into 400Ω), while negative temperature coefficient supply current (6mA typ. per amplifier at 25°C, <7mA at 150°C) enables predictable thermal management in dual-amplifier configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 100MHz at G = 2, RF = RG = 750Ω, RL = 100Ω - guarantees flat frequency response up to NTSC/PAL video baseband |
| Slew Rate | 2500V/µs (overdriven inverting mode) - enables clean 10V step response in ≤10ns without slewing distortion |
| Output Drive Current | 30mA continuous - sufficient to drive 75Ω or 150Ω video cables with minimal droop |
| Differential Gain / Phase | 0.04% / 0.1° at RL = 150Ω - meets broadcast-grade video fidelity requirements for composite signals |
| Input Impedance | 25MΩ || 3pF - presents negligible loading to preceding stages, even with power off |
| Supply Range | ±2V to ±15V (4V–30V total) - supports single-supply 5V designs via level-shifting and split-rail industrial systems |
| Quiescent Current | 6mA per amplifier at 25°C - enables dual-channel operation within 12mA total, critical for thermally constrained PCB layouts |
Pinout & Package
LT1229CN8#PBF is housed in an 8-pin plastic DIP (N8) package with 0.300-inch width, JEDEC MS-001 compliant footprint, θJA = 100°C/W, and 150°C max junction temperature. Pin 1 is top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives low-impedance loads directly; requires 750Ω feedback resistor for stable 100MHz operation |
| 2 | –IN A | Inverting input of Amp A - connects to feedback network; stray capacitance here causes peaking above 10MHz |
| 3 | +IN A | Noninverting input of Amp A - 25MΩ input resistance avoids loading source; common-mode range extends to within 1.5V of rails |
| 4 | V– | Negative supply rail - must be decoupled with ≥0.1µF ceramic near pin; mismatch >1V increases offset by 350µV/V |
| 5 | V+ | Positive supply rail - same decoupling requirement; total supply range ±2V to ±15V defines operating headroom |
| 6 | +IN B | Noninverting input of Amp B - electrically isolated from Amp A; crosstalk <65dB at 10MHz ensures channel separation |
| 7 | –IN B | Inverting input of Amp B - independent feedback path; layout symmetry minimizes inter-channel coupling |
| 8 | OUT B | Amplifier B output - identical drive capability to Pin 1; dual configuration enables RGB or Y/C splitting without external buffering |
Key Features
| Feature | Design Value |
|---|---|
| Current feedback topology | Maintains 100MHz bandwidth from G = 2 to G = 100 - eliminates gain-bandwidth trade-off in video gain stages |
| High input impedance | 25MΩ || 3pF - prevents signal degradation when driving long traces or unterminated inputs |
| Rail-compatible I/O | Inputs accept signals within 1.5V of V±; outputs swing within 0.8V - maximizes dynamic range on ±15V supplies |
| Low distortion at high frequency | 0.04% differential gain / 0.1° phase at 150Ω load - preserves color fidelity in broadcast and medical imaging |
| Thermal-stable biasing | Supply current decreases with temperature - simplifies thermal design in dual-channel video amplifiers |
Applications
| RGB Video Amplification | Cable Driver for Composite Video |
|---|---|
Use Scenario: Amplifying red, green, and blue analog video signals in LCD controller interfaces or broadcast monitors. IC Role / Device Role / Timing Role: Dual-channel buffer driving three 75Ω coaxial cables simultaneously with matched gain and phase. Use Value: 0.04% differential gain ensures no hue shift between channels; 100MHz bandwidth supports UXGA (1600×1200) pixel clocks. | Use Scenario: Driving double-terminated 75Ω composite video cables in security DVRs or test equipment. IC Role / Device Role / Timing Role: Single LT1229CN8#PBF used as loop-through amplifier with DC-coupled input biasing. Use Value: 30mA output drive sustains 2VP-P signal integrity over 100m cable; 0.1° differential phase prevents luminance/chrominance misalignment. |
| Test Equipment Signal Conditioning | Video Instrumentation Amplifier |
Use Scenario: Front-end gain stage in oscilloscope vertical amplifiers or arbitrary waveform generator outputs. IC Role / Device Role / Timing Role: High-speed inverting amplifier with programmable gain using precision resistors. Use Value: 2500V/µs slew rate enables sub-10ns rise time on 10V steps; low 3.2nV/√Hz noise preserves SNR in sensitive measurements. | Use Scenario: Precision gain block in medical endoscopy or avionics display systems requiring EMI-hardened analog paths. IC Role / Device Role / Timing Role: Noninverting buffer isolating sensor outputs from long cable runs. Use Value: Input common-mode range to within 1.5V of supplies allows direct connection to ±12V sensor outputs without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1229CS8#PBF | Same die, SO-8 package; θJA = 150°C/W vs 100°C/W for N8 - higher thermal resistance limits max supply voltage to ±10.6V at 70°C ambient | Surface-mount assembly required; unsuitable for through-hole prototyping or high-power cable driving | Select only when board space constraints mandate SO-8 and power dissipation remains below 0.533W |
| LT1395CS8#PBF | Single 400MHz CFA; 1100V/µs slew rate; wider supply range (±1.5V to ±18V); higher cost and different pinout | Requires two devices for dual-channel use; superior bandwidth but over-specified for standard definition video | Choose when >200MHz bandwidth or lower distortion (<0.01% DG) is mandatory, accepting added complexity and cost |
Compared with LT1229CS8#PBF and LT1395CS8#PBF, the LT1229CN8#PBF offers optimal thermal performance in through-hole video systems, guaranteed 100MHz bandwidth at G=2 with plastic DIP mechanical robustness, and lowest cost per channel for SD/HD RGB distribution.
Availability
LT1229CN8#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 LT1229CN8#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, datasheet archives, and application engineering for legacy Linear parts including the LT1229 series.
The LT1229CN8#PBF belongs to Linear's high-speed current feedback amplifier product line, designed specifically for video signal integrity, cable driving, and instrumentation where bandwidth, slew rate, and differential distortion metrics are critical.
FAQ
What is the maximum supply voltage rating for LT1229CN8#PBF?
The absolute maximum supply voltage for LT1229CN8#PBF is ±18V, but the recommended operating range is ±2V to ±15V. At 70°C ambient, thermal limits restrict practical use to ±15.6V in plastic DIP packaging to maintain junction temperature ≤150°C, as confirmed in Linear's power dissipation guidelines for cable driving applications.
Does LT1229CN8#PBF support single-supply operation?
Yes, LT1229CN8#PBF operates from single supplies as low as +4V (e.g., +5V with ground reference). Input common-mode range extends to within 1.5V of either rail, and output swing reaches within 0.8V of supplies - enabling DC-coupled video amplification with proper input biasing, as demonstrated in LT1229 • TA11.
What is the small-signal rise time of LT1229CN8#PBF?
The small-signal rise time of LT1229CN8#PBF is 3.5ns under standard test conditions (VS = ±15V, RF = RG = 750Ω, RL = 100Ω), corresponding to its 100MHz –3dB bandwidth. This value is measured from 10% to 90% of a ±500mV output step and is guaranteed for plastic DIP packaged units per datasheet Note 7.
Can LT1229CN8#PBF drive capacitive loads directly?
Yes, LT1229CN8#PBF can drive capacitive loads directly when the feedback resistor is selected per the "Maximum Capacitive Load vs Feedback Resistor" curve (TPC10), which specifies values for ≤5dB peaking. For example, with RF = 2kΩ and gain = 2, it safely drives up to 10,000pF; adding a 10Ω–20Ω series resistor at the output provides additional isolation if peaking occurs.
How does crosstalk affect dual-channel operation of LT1229CN8#PBF?
LT1229CN8#PBF exhibits <65dB output-to-input crosstalk at 10MHz between its two amplifiers due to shared supply lines and internal bond-wire coupling. This is verified in TA12 and TPC12; layout best practices (separate ground planes, supply decoupling per channel) reduce crosstalk to >100dB below 100kHz, preserving channel independence in RGB or stereo video systems.
LT1229CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1229CN8#PBF FAQ
1.How can I place an order for LT1229CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1229CN8#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 LT1229CN8#PBF reliable?
The price and inventory of LT1229CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1229CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1229CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1229CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1229CN8#PBF?
LT1229CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1229CN8#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 LT1229CN8#PBF?
For technical support, including LT1229CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1229CN8#PBF requirements.
6.How does Aetrix verify that LT1229CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1229CN8#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 LT1229CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1229CN8#PBF?
All LT1229CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1229CN8#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 LT1229CN8#PBF part is unused and in its original packaging.
Return procedure for LT1229CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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