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Analog Devices Inc. LT1397CS#PBF
- Part No.:
- LT1397CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1397CS#PBF.pdf
- Description:
- IC OPAMP CFA 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,220
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Product details
Overview
LT1397CS#PBF from Analog Devices (formerly Linear Technology) is a quad-channel current feedback amplifier optimized for high-speed video and RGB signal conditioning. It delivers 400MHz bandwidth at unity gain, 800V/μs slew rate, ±80mA output drive, and operates on ±5V supplies with 4.6mA per amplifier supply current. It is used in buffered RGB-to-color-difference matrix circuits for broadcast video equipment.
For engineers reviewing the LT1397CS#PBF datasheet, LT1397CS#PBF pinout, LT1397CS#PBF application, or LT1397CS#PBF equivalent, key selection criteria include quad-channel current feedback architecture, SO-14 package compatibility, ±5V operation with low distortion (<0.02% differential gain), and verified performance in video loop-through and color-space conversion systems.
Technical Context
The LT1397CS#PBF implements a current feedback topology with separate high-impedance noninverting inputs and low-impedance inverting inputs, enabling stable wideband operation up to 400MHz at AV = 1. Its transimpedance gain stage drives outputs via a high-slew-rate buffer capable of sourcing/sinking ±80mA into 150Ω loads.
It features standard quad op-amp pinout in 14-lead SO packaging, supports ±2V to ±6V dual supplies, and maintains 0.1dB gain flatness to 100MHz across gains of 1, 2, and –1 - critical for composite video and RGB signal fidelity without post-compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3dB) | 400MHz at AV = 1; enables full HD baseband video amplification without roll-off |
| Slew Rate | 800V/μs; supports fast transient response for 1080p/60 video edges |
| Output Current | ±80mA; drives 75Ω coaxial cables and multiple downstream loads directly |
| Supply Current | 4.6mA per amplifier at ±5V; total 18.4mA for all four channels, enabling low-power video processing |
| Differential Gain / Phase | 0.02% / 0.04° at 4.43MHz; meets NTSC/PAL broadcast video linearity requirements |
| Input Noise | 4.5nV/√Hz input voltage noise; preserves SNR in analog front-end signal chains |
| Operating Temp Range | –40°C to 85°C functional; specified performance guaranteed 0°C to 70°C per data sheet |
Pinout & Package
LT1397CS#PBF is housed in a 14-lead plastic SO (Small Outline) package with exposed pad not present; thermal resistance θJA = 100°C/W. Pin 1 is OUT A; pins 2–3 are –IN A / +IN A; pin 4 is V+; pins 5–6 are +IN B / –IN B; pin 7 is OUT B; pins 8–10 are OUT C / –IN C / +IN C; pin 11 is V–; pins 12–14 are +IN D / –IN D / OUT D. All inputs and outputs are DC-coupled and ESD-protected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | A channel output | High-current, low-impedance output node; connects directly to 75Ω video load or next-stage input |
| –IN A (Pin 2) | Inverting input of Channel A | Low-impedance current-summing node; requires resistive feedback for stability |
| +IN A (Pin 3) | Noninverting input of Channel A | High-impedance voltage-sensing node; minimal loading on source (e.g., RGB coax) |
| V+ (Pin 4) | Positive supply rail | Accepts +2V to +6V; must be ≥3V above EN if used (not applicable here) |
| +IN B (Pin 5) | Noninverting input of Channel B | Independent high-Z input; enables parallel RGB channel routing without crosstalk |
| –IN B (Pin 6) | Inverting input of Channel B | Current-summing node; shares same feedback resistor topology as Channel A |
| OUT B (Pin 7) | B channel output | Matched drive capability to OUT A; supports simultaneous dual-channel video buffering |
| OUT C (Pin 8) | C channel output | Third independent output; used in Y/R-Y/B-Y triple-output color-difference generation |
| –IN C (Pin 9) | Inverting input of Channel C | Enables summing of weighted RGB components for luminance (Y) derivation |
| +IN C (Pin 10) | Noninverting input of Channel C | Provides high-Z reference path for Y signal reconstruction |
| V– (Pin 11) | Negative supply rail | Accepts –2V to –6V; establishes common-mode baseline for bipolar video swing |
| +IN D (Pin 12) | Noninverting input of Channel D | Fourth independent input; supports full quad-channel RGB or component video paths |
| –IN D (Pin 13) | Inverting input of Channel D | Supports active termination and gain-setting in fourth video channel |
| OUT D (Pin 14) | D channel output | Full-drive output matching other channels; enables 4×75Ω back-terminated outputs |
Key Features
| Feature | Design Value |
|---|---|
| 400MHz current feedback architecture | Delivers flat frequency response and minimal phase shift up to 100MHz, eliminating need for external peaking compensation in video loops |
| 0.02% differential gain error | Preserves color saturation accuracy in NTSC/PAL broadcast signals without post-correction circuitry |
| Quad-channel SO-14 layout | Matches industry-standard footprint for drop-in replacement in legacy video amplifier designs |
| ±80mA output drive capability | Drives 75Ω coaxial cable and multiple downstream loads simultaneously without external buffers |
| 4.6mA per amplifier supply current | Enables four-channel video conditioning within 20mA total budget - suitable for portable and power-constrained systems |
| ±5V optimized operation | Maximizes slew rate and bandwidth while minimizing power-supply rejection sensitivity in standard video rails |
Applications
| RGB Video Signal Conditioning | Composite Video Loop-Through |
|---|---|
Use Scenario: Amplifying and distributing RGB signals from graphics processors to multiple monitors or projectors. IC Role / Device Role / Timing Role: Quad-channel current feedback amplifier providing matched gain, delay, and drive strength across R/G/B/blank or sync channels. Use Value: Maintains sub-0.05° phase matching between channels, preventing color fringing and timing skew in multi-display setups. |
Use Scenario: Re-amplifying composite video signals in distribution amplifiers or switchers without degrading sync tip or burst amplitude. IC Role / Device Role / Timing Role: Unity-gain buffer with high input impedance and low output impedance, preserving signal integrity across cascaded stages. Use Value: 0.1dB gain flatness to 100MHz ensures minimal chroma/luma delay mismatch, meeting SMPTE 253M compliance. |
| Color-Space Conversion Matrix | High-Speed MUX Amplifier |
Use Scenario: Converting RGB inputs to Y/R-Y/B-Y outputs in broadcast encoders or video scalers. IC Role / Device Role / Timing Role: Four independent amplifiers configured as summing nodes and gain blocks to implement linear color-matrix equations. Use Value: Matched channel performance ensures <0.03% inter-channel gain error, critical for accurate luminance/chrominance separation. |
Use Scenario: Selecting and amplifying one of several high-frequency analog video sources in automated test equipment. IC Role / Device Role / Timing Role: Low-propagation-delay (2.5ns) amplifier used after analog multiplexer to restore signal edge integrity. Use Value: 800V/μs slew rate recovers fast transitions degraded by mux ON-resistance and parasitic capacitance. |
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 |
|---|---|---|---|
| THS3201DGNR | Single-channel, 1.8GHz bandwidth, 4000V/μs slew rate, 12mA supply current; DFN-8 package | Higher bandwidth but single-channel; requires four devices for quad functionality and increases board area | Select when >1GHz small-signal bandwidth is required and space allows discrete channel replication |
| LMH6723MA/NOPB | Dual-channel, 650MHz bandwidth, 3100V/μs slew rate, 12.5mA per amp; SO-8 package | Dual-channel only; two units needed for quad function; higher supply current increases thermal load | Choose for cost-sensitive dual-channel video paths where 650MHz bandwidth suffices and layout permits dual placement |
Compared with LT1397CS#PBF, THS3201DGNR offers higher bandwidth but lacks integrated quad-channel integration, while LMH6723MA/NOPB provides dual-channel convenience at lower per-channel power efficiency and reduced channel matching versus monolithic quad design.
Availability
LT1397CS#PBF is available at Aetrix Electronics and suitable for broadcast video infrastructure, medical imaging displays, and industrial machine vision systems requiring stable component supply and long-term obsolescence management.
Supply support for LT1397CS#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1397 belongs to Linear Technology's high-speed current feedback amplifier product line, designed specifically for demanding video, instrumentation, and communications signal-path applications requiring wide bandwidth and precision DC performance.
FAQ
What is the maximum capacitive load the LT1397CS#PBF can drive stably?
The LT1397CS#PBF can drive up to 100pF capacitive load with RF = RG = 255Ω and AV = +2 while maintaining <2% overshoot. For larger loads, adding a 5Ω–35Ω series resistor at the output isolates the capacitance and preserves stability without requiring PCB redesign. This behavior is confirmed in Figure G14 of the official datasheet.
Does the LT1397CS#PBF support single-supply operation?
Yes, the LT1397CS#PBF operates from a single 4V to 12V supply (e.g., 5V or 12V), with V– connected to ground. Input common-mode range extends to within 1V of either rail, and output swing reaches within 0.6V of each rail under 150Ω load - enabling true single-supply video amplification with proper level-shifting.
How does the LT1397CS#PBF compare to voltage-feedback op amps in video applications?
Unlike voltage-feedback op amps, the LT1397CS#PBF uses current feedback architecture, delivering constant bandwidth across gains and superior slew rate vs. gain dependency. Its 400MHz bandwidth at AV = 1 and 0.1dB flatness to 100MHz make it better suited for RGB and component video than general-purpose VFB op amps like the LM6172.
Is the LT1397CS#PBF pin-compatible with other LT139x family members in SO-14 packages?
Yes - the LT1397CS#PBF shares identical pinout with the LT1397CGN (SSOP-16) and LT1397CDE (DFN-14) variants in functional channel assignment. However, SO-14 (LT1397CS#PBF) has no NC pins, whereas SSOP-16 includes two NC pins (8 and 9); direct PCB substitution is feasible only between SO-14 and DFN-14 footprints with thermal pad adaptation.
What is the typical differential phase error of the LT1397CS#PBF at NTSC frequencies?
The LT1397CS#PBF achieves 0.04° differential phase error at 4.43MHz under standard test conditions (RF = RG = 255Ω, RL = 150Ω), as measured using Tektronix TSG120YC/NTSC generator and 1780R Video Measurement Set. This value is consistent across all four channels and supports broadcast-grade video signal integrity.
LT1397CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 800V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 400 MHz
- Current - Input Bias:
- 10 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 4.6mA (x4 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:
- 14-SO
LT1397CS#PBF FAQ
1.How can I place an order for LT1397CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1397CS#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 LT1397CS#PBF reliable?
The price and inventory of LT1397CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1397CS#PBF is usually 5 days.
3.What payment methods are accepted for LT1397CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1397CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1397CS#PBF?
LT1397CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1397CS#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 LT1397CS#PBF?
For technical support, including LT1397CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1397CS#PBF requirements.
6.How does Aetrix verify that LT1397CS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1397CS#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 LT1397CS#PBF meets industry standards.
7.What is the process for return or replacement of LT1397CS#PBF?
All LT1397CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1397CS#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 LT1397CS#PBF part is unused and in its original packaging.
Return procedure for LT1397CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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