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Analog Devices Inc. LT1399IS#PBF
- Part No.:
- LT1399IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1399IS#PBF.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,022
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Product details
Overview
LT1399IS#PBF from Analog Devices (formerly Linear Technology) is a triple 300MHz current feedback amplifier with independent shutdown pins per channel, designed for high-speed video routing and RGB cable driving. It delivers 800V/µs slew rate, 30ns turn-on time, ±5V input differential range, and operates on ±5V supplies in a 16-pin narrow SO package.
For engineers reviewing the LT1399IS#PBF datasheet, LT1399IS#PBF pinout, LT1399IS#PBF application, or LT1399IS#PBF equivalent, key selection criteria include its 300MHz bandwidth at AV = 1/2/–1, 0.1dB gain flatness to 150MHz, high-impedance shutdown state (0µA supply current), fast enable/disable timing, and suitability for composite video, LCD driver, and RGB MUX systems requiring precise settling and low crosstalk.
Technical Context
The LT1399IS#PBF implements a current feedback architecture with three independent amplifiers, each featuring separate enable (EN) inputs that drive outputs to high-impedance and reduce supply current to ≤100µA when asserted high. Its transimpedance gain stage enables stable operation with external RF/RG resistors, supporting closed-loop gains of +1, +2, and –1.
Each amplifier maintains 300MHz –3dB bandwidth and 150MHz 0.1dB gain flatness across ±5V supplies, with differential input voltage limited to ±5V and output swing up to ±3.6V into 150Ω. Channel isolation is enhanced by unconnected internal ground pins (Pins 3, 6, 12, 13), requiring external grounding for optimal crosstalk suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3dB) | 300MHz at AV = 1, 2, –1 with ±5V supplies - supports NTSC/PAL video baseband and high-resolution RGB pixel clock harmonics. |
| Gain Flatness | 0.1dB to 150MHz - ensures minimal amplitude distortion across broadcast video spectrum. |
| Slew Rate | 800V/µs at AV = 2, RL = 150Ω - enables clean 10MHz square wave reproduction with <10% overshoot. |
| Turn-On/Off Time | 30ns / 40ns - allows sub-32ns channel switching in 3-input video MUX applications. |
| Supply Range | ±2V to ±6V (4V–12V total) - compatible with standard ±5V logic and analog rails without level-shifting. |
| Output Current | ±80mA - drives 75Ω coaxial cables, 150Ω back-terminated loads, and capacitive LCD column lines. |
| Shutdown Current | ≤100µA per amplifier - eliminates quiescent power in inactive channels for portable equipment battery savings. |
Pinout & Package
LT1399IS#PBF is housed in a 16-lead narrow SO (Small Outline) plastic package (S package), 100°C/W junction-to-ambient thermal resistance, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (–IN R) | Inverting input of red-channel amplifier | Current feedback node requiring resistive termination (e.g., 324Ω) to OUT R for stability; sensitive to stray capacitance. |
| Pin 2 (+IN R) | Noninverting input of red-channel amplifier | High-impedance signal entry point; accepts DC-coupled RGB or composite video baseband signals. |
| Pins 3, 6, 12, 13 (GND) | Ground terminals | Not internally connected - must be externally tied to system ground to minimize inter-channel crosstalk and improve PSRR. |
| Pin 9 (EN B) | Enable control for blue-channel amplifier | Logic-low active; pulls to V– (e.g., –5V) to enable; ≥3V below V+ required for zero-supply-current shutdown. |
| Pin 10 (OUT B) | Output of blue-channel amplifier | Capable of ±3.6V swing into 150Ω; may require series resistor (e.g., 16.9Ω) for >300pF capacitive loads. |
| Pin 11 (V–) | Negative supply rail | Accepts –2V to –6V; mismatch >1V vs V+ degrades offset voltage (~600µV/V) and bias current (~2µA/V). |
| Pin 14 (V+) | Positive supply rail | Accepts +2V to +6V; powers all three amplifiers; supplies enable logic threshold reference. |
| Pins 15–16 (OUT R, EN R) | Red-channel output and enable | Matched timing and drive strength to Pins 10/9 (B) and 12/13 (G); supports synchronous 3-channel MUX switching. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent current feedback amplifiers | Enables simultaneous RGB signal conditioning with isolated enable control-no shared bias or supply interaction between channels. |
| 300MHz bandwidth with 0.1dB flatness to 150MHz | Preserves luminance/chrominance integrity in SD/HD video signals without equalization or post-filtering. |
| 30ns turn-on / 40ns turn-off | Supports real-time video source switching with <32ns inter-channel transition delay in MUX configurations. |
| Zero-current shutdown mode | Reduces system-level standby power in portable displays and spread-spectrum clocked equipment. |
| ±5V differential input rating | Withstands transient overvoltage during hot-plug events or ESD discharge without latch-up or parametric shift. |
| High output drive (±80mA) | Directly terminates 75Ω coax, drives long traces, and sustains 150Ω back-termination without external buffers. |
Applications
| RGB Video MUX Switching | Composite Video Cable Driver |
|---|---|
Use Scenario: Switching between three RGB video sources (e.g., VGA, DVI, HDMI converter) to a single display port with minimal glitching. IC Role / Device Role / Timing Role: Triple current feedback amplifier acting as active 3:1 analog multiplexer with per-channel enable control and matched propagation delay (2.5ns). Use Value: Achieves <32ns channel-to-channel switching with <10% overshoot and 0.1% settling in 25ns-enabling seamless video source transitions without visible artifacts. | Use Scenario: Driving 75Ω coaxial cable runs up to 100m for NTSC/PAL composite video distribution in broadcast monitoring systems. IC Role / Device Role / Timing Role: High-slew-rate buffer amplifier configured for unity gain with 75Ω back-termination (RF = RG = 324Ω). Use Value: Delivers 0.13% differential gain and 0.10° differential phase error at 3.58MHz-meeting SMPTE RP-168 broadcast fidelity requirements. |
| LCD Column Driver Interface | Spread Spectrum Clock Amplifier |
Use Scenario: Buffering gamma-corrected grayscale voltages to XGA/UXGA LCD column electrodes with fast settling and low noise. IC Role / Device Role / Timing Role: High-output-current amplifier driving >300pF capacitive loads via 16.9Ω series resistor, operating at ±5V. Use Value: Settles to 0.1% in 30ns for 6V step (per LT1399HV data), enabling >30kHz frame rates with full 8-bit grayscale fidelity. | Use Scenario: Amplifying spread-spectrum clock (SSC) signals in EMI-sensitive laptop motherboard designs to reduce radiated emissions. IC Role / Device Role / Timing Role: Low-jitter, high-bandwidth buffer with fast enable/disable for dynamic SSC gating during low-power states. Use Value: 30ns turn-on ensures SSC signal integrity during CPU/CPU-GPU state transitions-preventing clock domain misalignment and display flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1399CS#PBF | Same electrical specs and pinout; rated for 0°C to 70°C operation (vs. –40°C to 85°C for LT1399IS#PBF). | Not qualified for extended industrial temperature range; unsuitable for automotive or outdoor display enclosures. | Select LT1399CS#PBF only for commercial-grade indoor equipment with ambient <70°C. |
| LT1399HVCS#PBF | Higher voltage rating (±7.5V max); identical pinout and AC performance but wider supply range and ±6.7V output swing. | Required for ±7.5V systems or LCD drivers needing >±3.6V output swing; not drop-in for ±5V-only designs due to different PSRR vs frequency profile. | Choose LT1399HVCS#PBF when driving high-voltage LCD panels or operating beyond ±6V supply rails. |
Compared with LT1399CS#PBF, LT1399IS#PBF adds guaranteed –40°C to +85°C operation for harsh environments, while LT1399HVCS#PBF extends voltage headroom at the cost of higher quiescent current (7mA vs 4.6mA) and altered thermal derating-making LT1399IS#PBF the optimal choice for industrial RGB video infrastructure where temperature robustness and ±5V compatibility are critical.
Availability
LT1399IS#PBF is available at Aetrix Electronics and suitable for RGB video MUX switching, composite video cable driving, and LCD column interface applications requiring stable component supply across extended temperature ranges and high-speed analog signal integrity.
Supply support for LT1399IS#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1399 product line was developed specifically for high-bandwidth video signal routing and cable driving, emphasizing fast enable/disable control, low crosstalk, and robust 75Ω system interfacing in compact SO packages.
FAQ
What is the operating temperature range guaranteed for LT1399IS#PBF?
The LT1399IS#PBF is fully specified and guaranteed to meet all electrical performance parameters over the industrial temperature range of –40°C to +85°C. This is explicitly confirmed in Note 4 and Note 9 of the official datasheet, distinguishing it from the commercial-grade LT1399CS#PBF (0°C to 70°C). Thermal design must account for θJA = 100°C/W in the narrow SO package.
Can LT1399IS#PBF drive a 75Ω coaxial cable directly?
Yes, the LT1399IS#PBF can directly drive 75Ω coaxial cable when configured in unity-gain mode with appropriate feedback (e.g., RF = RG = 324Ω) and back-termination. Its ±80mA output current and 300MHz bandwidth ensure minimal signal degradation, and typical differential gain/phase errors of 0.13%/0.10° at 3.58MHz confirm broadcast-grade fidelity for LT1399IS#PBF in such configurations.
How does the enable pin (EN) function on LT1399IS#PBF?
Each channel of LT1399IS#PBF has a dedicated enable pin (EN R, EN G, EN B) that is active-low. Pulling an EN pin to V– (e.g., –5V) activates the corresponding amplifier; pulling it ≥3V below V+ disables it, reducing supply current to ≤100µA and placing the output in high-impedance state. The enable pin current is typically 30µA when active, and CMOS logic-level drive is sufficient.
What is the maximum capacitive load LT1399IS#PBF can drive without instability?
The LT1399IS#PBF can drive up to ~1000pF with proper feedback resistor selection (e.g., RF = 2100Ω for AV = +2) or up to ~330pF with a 16.9Ω series output resistor while maintaining <2% overshoot. Stability depends on feedback resistor value, gain configuration, and load capacitance-refer to Figure 13 (G13) and Figure 14 (G14) in the datasheet for exact trade-offs applicable to LT1399IS#PBF.
Is LT1399IS#PBF pin-compatible with LT1260?
Yes, the LT1399IS#PBF is a pin-for-pin upgrade to the LT1260, optimized for ±5V/±7.5V supplies. Both share identical 16-pin SO pinouts and functional assignments (e.g., EN pins, IN/OUT mapping), but LT1399IS#PBF offers improved 300MHz bandwidth, faster 30ns turn-on, lower 4.6mA supply current per amplifier, and enhanced 0.1dB gain flatness to 150MHz-making it a direct replacement where those parameters matter.
LT1399IS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 16-SOIC (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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1399IS#PBF FAQ
1.How can I place an order for LT1399IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1399IS#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 LT1399IS#PBF reliable?
The price and inventory of LT1399IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1399IS#PBF is usually 5 days.
3.What payment methods are accepted for LT1399IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1399IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1399IS#PBF?
LT1399IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1399IS#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 LT1399IS#PBF?
For technical support, including LT1399IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1399IS#PBF requirements.
6.How does Aetrix verify that LT1399IS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1399IS#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 LT1399IS#PBF meets industry standards.
7.What is the process for return or replacement of LT1399IS#PBF?
All LT1399IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1399IS#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 LT1399IS#PBF part is unused and in its original packaging.
Return procedure for LT1399IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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