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Analog Devices Inc. LT6558CGN#PBF
- Part No.:
- LT6558CGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Video Amps and Modules
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LT6558CGN#PBF.pdf
- Description:
- IC AMP GENERAL PURPOSE 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,736
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Product details
Overview
LT6558CGN#PBF from Analog Devices (formerly Linear Technology) is a high-speed triple video amplifier with fixed gain of 1, programmable DC input bias control, and independent per-channel power/ground pins. It delivers 550MHz small-signal bandwidth, 2200V/µs slew rate, ±90mA output drive, and rail-to-rail output swing within 0.8V of 5V supply rails-optimized for RGB HD video amplification in LCD projectors and coaxial cable drivers.
For engineers reviewing the LT6558CGN#PBF datasheet, LT6558CGN#PBF pinout, LT6558CGN#PBF application, or LT6558CGN#PBF equivalent, key selection criteria include AC-coupled input bias programmability via BCV pin, channel isolation enabled by separate V+/GND pins, differential gain/phase accuracy (0.02%/0.02°), shutdown capability via EN pin, and compatibility with 5V single-supply wideband video systems.
Technical Context
The LT6558CGN#PBF integrates three independent unity-gain voltage buffers with matched gain error (±0.05% typ) and <–80dB crosstalk at 10MHz. Its internal bias control circuitry allows all three inputs to be set to a common DC level using a single resistor between BCV (Pin 16) and GND (Pin 2), eliminating external clamps in AC-coupled video paths.
Each amplifier features dedicated V+ and GND terminals (Pins 9/4, 11/6, 13/8) to minimize inter-channel coupling and simplify bypassing. The enable/shutdown pin (Pin 1) controls global operation with 50ns turn-on and 1µs turn-off, reducing supply current from 25mA per channel to 10µA total in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 550MHz at 0.2VP-P: supports full HD (1080p) pixel rates without attenuation |
| Large-Signal Bandwidth | 400MHz at 2VP-P: maintains fidelity for broadcast-quality video signals |
| Slew Rate | 2200V/µs: enables fast transient response for sharp video edges and sync pulses |
| Differential Gain / Phase | 0.02% / 0.02°: preserves color fidelity in NTSC/PAL composite and component video |
| Output Swing | 0.8V to 4.2V on 5V supply: delivers full 2VP-P video swing with headroom for DC restoration |
| Supply Range | 3V to 7.5V: supports both 3.3V and 5V systems, including dual ±2.5V operation |
| Enable Pin Threshold | EN < 1.5V below V+: allows direct CMOS logic control without level-shifting |
Pinout & Package
LT6558CGN#PBF is packaged in a 16-lead SSOP (GN package) with exposed pad not present; thermal resistance θJA = 110°C/W. All ground and supply pins are isolated per channel to maximize crosstalk rejection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | Global enable/shutdown control | Pulling low enables all three amplifiers; open-circuit disables via internal 40kΩ pull-up |
| GND (Pin 2) | Reference for EN and BCV | Must be externally connected to system ground; serves as return for bias programming resistor |
| IN R/G/B (Pins 3,5,7) | Noninverting inputs | High-impedance (450kΩ) when BCV open; biased to programmed voltage when BCV grounded |
| GND R/G/B (Pins 4,6,8) | Independent channel grounds | Not internally tied together-must be individually routed to ground plane to prevent crosstalk |
| V+ B/G/R (Pins 9,11,13) | Per-channel positive supplies | Enable independent bypassing; critical for maintaining >–80dB channel isolation at 100MHz |
| OUT B/G/R (Pins 10,12,14) | Amplifier outputs | Capable of ±90mA drive into 150Ω loads; swing to within 0.8V of rails ensures 2VP-P video compliance |
| V+ (Pin 15) | Control circuitry supply | Separate from amplifier supplies-powers bias generator and enable logic |
| BCV (Pin 16) | Bias control voltage input | Resistor to GND sets common-mode input bias (e.g., 158Ω → 2.5V on 5V supply) |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input bias | Single resistor (e.g., 158Ω) sets identical DC level across all three inputs-reduces external components in RGB AC-coupled designs |
| Channel-isolated supplies | Dedicated V+/GND per amplifier minimizes inter-channel crosstalk to –80dB @ 10MHz-critical for RGB separation in projectors |
| Rail-swing output drive | Outputs reach 0.8V low / 4.2V high on 5V supply-enables full 2VP-P video signal without level-shifting or clamping circuits |
| Ultra-high slew rate | 2200V/µs ensures minimal distortion on fast sync edges and high-frequency chroma components in HD video |
| Low-distortion video performance | 0.02% differential gain and 0.02° phase error preserve color accuracy in broadcast-grade analog video systems |
Applications
| LCD Video Projectors | RGB HD Video Amplifiers |
|---|---|
Use Scenario: Driving RGB analog signals from scaler ICs to three separate CRT or LCD panel drivers in front-projection systems. IC Role / Device Role / Timing Role: Triple unity-gain buffer with matched gain and phase across channels, preserving timing alignment and color fidelity. Use Value: Eliminates need for three discrete op-amps and external bias networks-reduces board area by >40% and improves channel-to-channel skew consistency. |
Use Scenario: Amplifying component video outputs (YPbPr or RGB) from media processors for HDMI transmitter or analog monitor interfaces. IC Role / Device Role / Timing Role: High-fidelity video driver with 550MHz bandwidth and <0.1dB gain flatness up to 100MHz-maintains pixel clock integrity and edge sharpness. Use Value: Delivers broadcast-compliant differential gain/phase (0.02%/0.02°) without post-correction circuitry-reducing BOM cost and calibration complexity. |
| Coaxial Cable Drivers | Low Supply ADC Drivers |
Use Scenario: Driving 75Ω coaxial cables carrying HD video signals over distances up to 30m in broadcast equipment and security DVRs. IC Role / Device Role / Timing Role: High-output-current (±90mA) buffer with 400MHz large-signal bandwidth-compensates for cable loss while preserving rise/fall times. Use Value: Sustains >40dB signal-to-noise ratio at 1080p60 over RG-59 cable without equalization-enabling plug-and-play analog video distribution. |
Use Scenario: Buffering video signals prior to digitization in medical imaging or test equipment with low-voltage ADCs (e.g., 3.3V supply). IC Role / Device Role / Timing Role: Single-supply 3V–7.5V operation with rail-swing output-matches ADC input range without level-shifting or negative supplies. Use Value: Enables direct interface to 12-bit+ video ADCs while maintaining SNR >70dB-avoiding gain errors introduced by external attenuators or op-amp stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple video amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT6554CDHC#PBF | Same 550MHz bandwidth and 2200V/µs slew rate, but in 5mm × 3mm DFN package (θJA = 40°C/W vs SSOP's 110°C/W); identical pinout except exposed pad (Pin 17 = GND) | Preferred for space-constrained, thermally demanding PCB layouts requiring lower junction temperature rise | Select LT6554CDHC#PBF when thermal management is critical and board real estate is limited; verify exposed pad soldering per DFN footprint. |
| LT6557CGN#PBF | 500MHz bandwidth, same 2200V/µs slew rate and 0.02%/0.02° video specs, but optimized for 75Ω cable drive with integrated 75Ω termination resistors | Better suited for direct coaxial output without external termination; slightly lower bandwidth trades off for improved cable matching | Choose LT6557CGN#PBF for embedded video transmitters where 75Ω source termination is required; avoid if driving unterminated loads or backplanes. |
Compared with LT6558CGN#PBF, LT6554CDHC#PBF offers superior thermal performance in compact layouts, while LT6557CGN#PBF provides integrated 75Ω drive capability at modest bandwidth reduction-making LT6558CGN#PBF optimal for general-purpose, high-fidelity RGB buffering where layout flexibility and universal load drive are prioritized.
Availability
LT6558CGN#PBF is available at Aetrix Electronics and suitable for LCD video projectors, RGB HD video amplifiers, coaxial cable drivers, and low-supply ADC drivers requiring stable component supply across industrial and broadcast video production cycles.
Supply support for LT6558CGN#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 continues its legacy of precision high-speed analog ICs for signal conditioning, power management, and data conversion.
The LT6558CGN#PBF belongs to Linear's video amplifier product line, designed specifically for broadcast-quality analog video signal conditioning in single-supply, high-density systems such as digital projectors and professional video equipment.
FAQ
What is the recommended programming resistor value for LT6558CGN#PBF in a 5V single-supply application?
The LT6558CGN#PBF datasheet specifies a 158Ω resistor between BCV (Pin 16) and GND (Pin 2) to set the input bias voltage to approximately 2.5V under 5V supply conditions. This value optimizes linearity and minimizes offset for standard RGB video levels. Using other values shifts the common-mode input voltage proportionally-e.g., 316Ω yields ~1.25V-requiring verification against signal swing margins in the target application.
Can LT6558CGN#PBF operate from dual supplies, and what are the recommended voltage ranges?
Yes, LT6558CGN#PBF supports dual-supply operation by connecting all GND pins to the negative rail (e.g., –2.5V) and V+/V+R/V+G/V+B pins to the positive rail (e.g., +2.5V). The datasheet recommends nominal ±2.5V to ±3.3V supplies. Total supply voltage (V+ to GND) must remain ≤7.5V. Performance metrics-including bandwidth, slew rate, and output swing-are specified across this dual-supply range and match single-supply behavior when referenced to mid-rail.
How does the LT6558CGN#PBF achieve –80dB crosstalk at 10MHz, and what layout practices preserve this spec?
The LT6558CGN#PBF achieves –80dB crosstalk at 10MHz through physically isolated per-channel V+ and GND pins (Pins 4/9, 6/11, 8/13), preventing shared-impedance coupling. To preserve this, each channel's supply must be bypassed locally with a 10nF capacitor placed <0.1 inch from its V+ pin, and all GND pins must connect to a solid ground plane-not daisy-chained. Splitting ground planes or routing sensitive traces near power pins degrades measured crosstalk by >20dB.
What is the maximum capacitive load the LT6558CGN#PBF can drive while maintaining stability, and how is it compensated?
The LT6558CGN#PBF is unity-gain stable and characterized to drive up to 8.2pF capacitive loads without oscillation, as shown in Figure 19 of the datasheet. For larger loads (e.g., >10pF), a small series resistor (10–22Ω) should be added at the output to isolate the capacitance. The amplifier's internal compensation is fixed; no external compensation network is required or supported. Driving 75Ω coaxial cables (typically 50–100pF/m) requires proper termination at the load end-not at the LT6558CGN#PBF output-to avoid peaking or ringing.
Does LT6558CGN#PBF require external feedback resistors, and how is gain set?
No, LT6558CGN#PBF has internal fixed gain of 1 and requires no external feedback resistors. Its architecture uses internal precision resistors to configure each amplifier as a unity-gain buffer. This eliminates gain-setting errors, thermal drift, and board space associated with external networks. The gain error is specified at ±0.9% max over temperature, and channel-to-channel gain match is ±0.05% typical-enabling precise RGB signal path alignment without trimming.
LT6558CGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- General Purpose
- Output Type:
- -
- Number of Circuits:
- 3
- -3db Bandwidth:
- 550 MHz
- Slew Rate:
- 2200V/µs
- Current - Supply:
- 22.5 mA
- Current - Output / Channel:
- 90 mA
- Voltage - Supply, Single/Dual (±):
- 3V ~ 7.5V, ±2.5V ~ 3.3V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-SSOP
LT6558CGN#PBF FAQ
1.How can I place an order for LT6558CGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6558CGN#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 LT6558CGN#PBF reliable?
The price and inventory of LT6558CGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6558CGN#PBF is usually 5 days.
3.What payment methods are accepted for LT6558CGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6558CGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6558CGN#PBF?
LT6558CGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6558CGN#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 LT6558CGN#PBF?
For technical support, including LT6558CGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6558CGN#PBF requirements.
6.How does Aetrix verify that LT6558CGN#PBF is sourced from the original manufacturer or authorized distributors?
All LT6558CGN#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 LT6558CGN#PBF meets industry standards.
7.What is the process for return or replacement of LT6558CGN#PBF?
All LT6558CGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6558CGN#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 LT6558CGN#PBF part is unused and in its original packaging.
Return procedure for LT6558CGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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