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Analog Devices Inc. LT1399CGN#PBF
- Part No.:
- LT1399CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT1399CGN#PBF.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,255
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Product details
Overview
LT1399CGN#PBF from Analog Devices (formerly Linear Technology) is a triple 300MHz current feedback amplifier with independent shutdown pins per channel, designed for high-speed RGB video cable driving and MUX applications. It operates on ±5V supplies, delivers 80mA output current, achieves 0.1dB gain flatness to 150MHz, and features 30ns turn-on/40ns turn-off timing. It is used in RGB-to-LCD interface circuits requiring fast settling and high channel isolation.
For engineers reviewing the LT1399CGN#PBF datasheet, LT1399CGN#PBF pinout, LT1399CGN#PBF application, or LT1399CGN#PBF equivalent, key selection criteria include its 300MHz bandwidth at AV = 1/2/–1, ±5V supply compatibility, 16-pin narrow SSOP package, shutdown-enabled zero-current disable mode, and verified performance in composite video and LCD driver topologies.
Technical Context
The LT1399CGN#PBF implements three independent current feedback amplifiers sharing a common ±5V supply and ground reference. Each channel uses resistive feedback (e.g., 324Ω) from output to inverting input for stable operation, with bandwidth directly dependent on feedback resistor value, supply voltage, and closed-loop gain.
Its enable logic is CMOS-compatible: EN pins pulled low activate channels (4.6mA supply current each); pulled high disables them (≤100µA total supply current, output high-impedance). Channel crosstalk is minimized by internal layout and external grounding of unconnected GND pins (Pins 3, 6, 12, 13).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3dB) | 300MHz at AV = 1, 2, or –1 with ±5V supply - enables full NTSC/PAL video spectrum and fast digital video transitions. |
| Gain Flatness | 0.1dB to 150MHz - preserves color fidelity and edge integrity in RGB and composite video signals. |
| Slew Rate | 800V/µs at AV = 2, RL = 150Ω - supports >100MHz square wave reproduction without distortion. |
| Output Current | ±80mA - drives 75Ω coaxial cables, 150Ω back-terminated loads, and capacitive LCD column lines directly. |
| Turn-On/Off Time | 30ns / 40ns - enables sub-35ns channel switching in 3-input video MUX designs. |
| Supply Range | ±2V to ±6V (4V–12V total) - supports single 5V, dual ±5V, or asymmetric rails without performance degradation. |
| Shutdown Current | ≤100µA per disabled amplifier - reduces system power in portable or spread-spectrum equipment during idle periods. |
Pinout & Package
The LT1399CGN#PBF is housed in a 16-lead narrow SSOP (GN) package with exposed pad thermal enhancement (θJA = 120°C/W). Ground pins (3, 6, 12, 13) are not internally connected; external grounding improves channel isolation and noise rejection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN R) | Inverting input, R-channel amplifier | Feedback node for R-channel; requires low-stray-capacitance PCB layout to avoid peaking. |
| 2 (+IN R) | Noninverting input, R-channel amplifier | High-impedance RGB red signal input; 75Ω source termination recommended. |
| 3 (GND) | Ground reference (not internally connected) | Must be externally tied to system ground plane to minimize crosstalk between R/G/B channels. |
| 4 (–IN G) | Inverting input, G-channel amplifier | Feedback node for G-channel; isolated routing prevents coupling into R/B paths. |
| 5 (+IN G) | Noninverting input, G-channel amplifier | RGB green signal input; matched trace length to Pin 2 critical for color timing alignment. |
| 6 (GND) | Ground reference (not internally connected) | External ground connection required for optimal G-channel PSRR and CMRR. |
| 7 (+IN B) | Noninverting input, B-channel amplifier | RGB blue signal input; referenced to same ground as Pins 3 and 6 for differential phase accuracy. |
| 8 (–IN B) | Inverting input, B-channel amplifier | Feedback node for B-channel; layout symmetry with Pins 1 and 4 maintains channel matching. |
| 9 (EN B) | Enable control, B-channel | Logic-low active; ≥3V below V+ ensures full shutdown; CMOS-compatible with 30µA input current. |
| 10 (OUT B) | Output, B-channel | Capable of driving 75Ω cable or 150Ω load; series resistor (5–35Ω) isolates capacitive loads. |
| 11 (V–) | Negative supply rail | Accepts –5V (typical); supports down to –2V; mismatch >1V degrades offset and bias current specs. |
| 12 (OUT G) | Output, G-channel | High-speed output with 2.5ns propagation delay; low output impedance (<1Ω at DC) aids cable driving. |
| 13 (EN G) | Enable control, G-channel | Independent shutdown allows dynamic power gating per color channel in portable displays. |
| 14 (V+) | Positive supply rail | Accepts +5V (typical); supports up to +6V; regulates internal bias currents across full supply range. |
| 15 (OUT R) | Output, R-channel | Delivers 1Vpp square wave with <10% overshoot at 10MHz; validated for RGB cable driver use. |
| 16 (EN R) | Enable control, R-channel | Enables/disables R-channel independently; critical for blanking or power sequencing in LCD timing controllers. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent current feedback architecture | Enables simultaneous RGB signal conditioning with matched AC response and minimal inter-channel skew. |
| 300MHz small-signal bandwidth at ±5V | Supports UXGA (1600×1200) and higher-resolution video interfaces without bandwidth limiting. |
| 0.1dB gain flatness to 150MHz | Maintains chroma/luma amplitude consistency across NTSC (4.43MHz), PAL (4.43/3.58MHz), and digital video spectra. |
| 30ns turn-on / 40ns turn-off | Permits sub-35ns channel switching in 3-input video multiplexers with no visible glitching. |
| Zero-supply-current shutdown mode | Reduces idle power in battery-operated devices; eliminates DC path when EN pins are high. |
| 80mA output drive capability | Directly drives 75Ω coax, 150Ω back-terminated loads, and 300pF+ LCD column capacitance with <30ns 0.1% settling. |
Applications
| RGB Video Cable Driver | 3-Input Video Multiplexer |
|---|---|
Use Scenario: Driving RGB analog signals over 1–3m coaxial cables to LCD panels or projectors. IC Role / Device Role / Timing Role: Triple buffer amplifier with matched gain, phase, and delay across R/G/B channels; provides 75Ω back-termination via external resistors. Use Value: Preserves 0.13% differential gain and 0.10° differential phase at 3.58MHz, ensuring accurate color reproduction without external equalization. | Use Scenario: Selecting one of three video sources (e.g., VGA, component, S-video) for display output. IC Role / Device Role / Timing Role: Three-channel MUX driver where only one EN pin is asserted at a time; outputs switch in ≤32ns with no DC offset transients. Use Value: Eliminates need for discrete analog switches; avoids charge injection and break-before-make delays inherent in FET-based MUX ICs. |
| LCD Column Driver Interface | Spread Spectrum Clock Amplifier |
Use Scenario: Buffering gamma-corrected grayscale voltages to high-capacitance LCD column electrodes. IC Role / Device Role / Timing Role: High-current, fast-settling buffer stage placed between DAC output and 300–500pF column line. Use Value: Achieves 0.1% settling in 25ns for 6V step (±7.5V supply), enabling >120Hz frame rates in high-resolution panels. | Use Scenario: Amplifying spread-spectrum clock signals in EMI-sensitive computing or industrial systems. IC Role / Device Role / Timing Role: Low-jitter, high-SR buffer that preserves spectral shaping while driving 50Ω transmission lines. Use Value: Maintains <10% overshoot and 1.3ns rise/fall time at 100MHz, preventing clock edge degradation that causes timing violations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple high-speed amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1399CS#PBF | Same electrical specs; packaged in 16-lead SO (S) instead of narrow SSOP (GN); θJA = 100°C/W vs. 120°C/W. | Better thermal performance in high-density layouts; larger footprint may conflict with fine-pitch RGB routing. | Select LT1399CS#PBF when board space allows SO package and thermal margin is critical. |
| LMH6738MA/NOPB | Triple 650MHz CFA; higher bandwidth but no per-channel shutdown; 16-pin TSSOP; 5.5mA/channel supply current. | Lacks independent enable pins; unsuitable for dynamic power-gating or MUX applications requiring per-channel control. | Choose LMH6738MA/NOPB only when maximum bandwidth is prioritized over shutdown functionality and channel independence. |
Compared with LT1399CS#PBF, the LT1399CGN#PBF offers identical performance in a smaller SSOP footprint-ideal for space-constrained RGB interfaces-while the LMH6738MA/NOPB trades shutdown capability for higher bandwidth, making it suitable only for always-on, ultra-high-frequency buffering.
Availability
LT1399CGN#PBF is available at Aetrix Electronics and suitable for RGB video interfaces, LCD timing controller support circuits, and spread-spectrum clock distribution systems requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production lots.
Supply support for LT1399CGN#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 RF technologies, formed through the acquisition of Linear Technology in 2017.
The LT1399CGN#PBF belongs to ADI's legacy Linear Technology high-speed amplifier product line, engineered specifically for demanding video signal conditioning, cable driving, and MUX applications where bandwidth, settling speed, and channel independence are critical.
FAQ
What is the operating temperature range guaranteed for the LT1399CGN#PBF?
The LT1399CGN#PBF is specified for operation from 0°C to 70°C (commercial grade). While characterized and expected to function across –40°C to 85°C, only the LT1399I variants are fully tested and guaranteed over the extended industrial range. The LT1399CGN#PBF is not qualified for –40°C startup or sustained 85°C ambient operation.
Can the LT1399CGN#PBF drive a 75Ω coaxial cable directly?
Yes, the LT1399CGN#PBF can drive a 75Ω coaxial cable directly using proper back-termination: configure each channel with RF = RG = 324Ω for AV = 2, then place a 75Ω resistor from OUTx to ground at the far end of the cable. This configuration maintains impedance match, minimizes reflections, and preserves the 0.1dB gain flatness to 150MHz as verified in the LT1399CGN#PBF datasheet.
What is the maximum capacitive load the LT1399CGN#PBF can drive without oscillation?
The LT1399CGN#PBF can drive up to 1000pF with RF = 324Ω and AV = 2 while maintaining ≤5dB peaking, per Figure 13 in the datasheet. For loads >100pF, adding a 5–35Ω series resistor at the output isolates the capacitance and restores stability without reducing small-signal bandwidth when unloaded. This technique is validated for 330pF LCD column loads in the LT1399CGN#PBF application notes.
How does the enable pin logic work on the LT1399CGN#PBF?
The LT1399CGN#PBF uses active-low enable logic: each EN pin (Pins 9, 13, 16) must be pulled to V– (e.g., –5V) or ground to activate its respective amplifier channel. Pulling an EN pin to V+ disables the channel, reducing supply current to ≤100µA and placing the output in high-impedance state. The enable pin draws ~30µA when active and requires ≥3V headroom below V+ for reliable shutdown.
Is the LT1399CGN#PBF pin-compatible with the LT1260?
Yes, the LT1399CGN#PBF is a pin-for-pin upgrade to the LT1260, optimized for ±5V/±7.5V supplies. All 16 pins retain identical functions and placement. However, the LT1399CGN#PBF delivers 300MHz bandwidth (vs. 220MHz for LT1260), faster 30ns turn-on, and improved 0.1dB flatness to 150MHz-making it a direct drop-in replacement with measurable performance gains in video and MUX applications.
LT1399CGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 3
- Output Type:
- -
- Slew Rate:
- 800V/µs
- Gain Bandwidth Product:
- 300 MHz
- -3db Bandwidth:
- 300 MHz
- Current - Input Bias:
- 10 µA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 4.6mA (x3 Channels)
- Current - Output / Channel:
- 80 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LT1399CGN#PBF FAQ
1.How can I place an order for LT1399CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1399CGN#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 LT1399CGN#PBF reliable?
The price and inventory of LT1399CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1399CGN#PBF is usually 5 days.
3.What payment methods are accepted for LT1399CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1399CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1399CGN#PBF?
LT1399CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1399CGN#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 LT1399CGN#PBF?
For technical support, including LT1399CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1399CGN#PBF requirements.
6.How does Aetrix verify that LT1399CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1399CGN#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 LT1399CGN#PBF meets industry standards.
7.What is the process for return or replacement of LT1399CGN#PBF?
All LT1399CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1399CGN#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 LT1399CGN#PBF part is unused and in its original packaging.
Return procedure for LT1399CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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