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Analog Devices Inc. LT6557IDHC#TRPBF
- Part No.:
- LT6557IDHC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Video Amps and Modules
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LT6557IDHC#TRPBF.pdf
- Description:
- IC AMP GENERAL PURPOSE 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,043
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Product details
Overview
LT6557IDHC#TRPBF from Analog Devices (formerly Linear Technology) is a high-speed triple video amplifier with fixed gain of 2, programmable DC input bias control, and independent per-channel power/ground pins. It delivers 500MHz small-signal bandwidth, 2200V/µs slew rate, and ±100mA output drive, enabling full 2VP-P video swing on a single 5V supply in RGB HD video driver applications.
For engineers reviewing the LT6557IDHC#TRPBF datasheet, LT6557IDHC#TRPBF pinout, LT6557IDHC#TRPBF application, or LT6557IDHC#TRPBF equivalent, key selection criteria include its 400MHz large-signal bandwidth at 2VP-P, 0.02% differential gain, 0.05° differential phase, enable/shutdown functionality, and dual-package availability in 16-lead DFN (5mm × 3mm) and SSOP.
Technical Context
The LT6557IDHC#TRPBF integrates three identical current-feedback amplifiers with fixed +2 gain, each featuring separate V+ and GND pins to minimize inter-channel crosstalk (<–80dB at 10MHz). Its programmable input bias circuit (via BCV pin and external resistor) enables precise DC level setting for AC-coupled RGB signals without external clamps.
It operates from 3V to 7.5V single supply or split supplies (±2.5V to ±3.3V), supports shutdown via EN pin (10µA quiescent current), and drives 150Ω loads to within 0.8V of rails - critical for 5V-based video systems requiring full-swing fidelity and low distortion (HD2 = –68dBc, HD3 = –75dBc at 10MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3dB Small-Signal BW | 500MHz - supports pixel clock frequencies up to 250MHz for HD video without attenuation. |
| –3dB Large-Signal BW (2VP-P) | 400MHz - maintains signal integrity for full-amplitude NTSC/PAL/RGB video waveforms. |
| Slew Rate | 2200V/µs - ensures <7ns 0.1% settling time for fast transient video edges. |
| Output Drive | ±100mA - directly drives 75Ω coaxial cables or multiple 150Ω loads without external buffers. |
| Differential Gain / Phase | 0.02% / 0.05° - preserves color fidelity in broadcast-quality analog video transmission. |
| Supply Range | 3V to 7.5V - compatible with standard 5V logic rails and industrial 3.3V/5V hybrid systems. |
| Operating Temp | –40°C to 85°C - qualified for industrial and embedded video equipment environments. |
Pinout & Package
LT6557IDHC#TRPBF uses a 16-lead, 5mm × 3mm plastic DFN package with exposed thermal pad (Pin 17 = GND). Pin 1 is marked by notch; top-side marking is "6557". Thermal resistance θJA = 40°C/W requires PCB soldering of the exposed pad for reliable operation at full output current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable Control Input | Pull low to enable all three amplifiers; internal 40kΩ pull-up disables part when open - enables low-power standby mode. |
| GND (2) | Control Ground Reference | Reference for EN and BCV pins; must be connected externally to system ground - isolates control circuitry from channel grounds. |
| IN R (3), IN G (5), IN B (7) | Noninverting Inputs (R/G/B) | High-impedance inputs (200kΩ when BCV open); accept AC-coupled video with programmable DC bias via BCV pin. |
| GND R (4), GND G (6), GND B (8) | Per-Channel Ground Returns | Independent ground paths for each amplifier - reduces inter-channel crosstalk and improves PSRR. |
| BCV (16) | Bias Control Voltage Input | Connect resistor to GND (Pin 2) to set common DC bias voltage across all three inputs - eliminates need for external clamp diodes. |
| V+ R (13), V+ G (11), V+ B (9), V+ (15) | Per-Channel & Control Supply Pins | Separate V+ connections allow localized bypassing and reduce supply coupling between channels. |
| OUT R (14), OUT G (12), OUT B (10) | Amplified Video Outputs | Capable of swinging to 0.8V from rail - delivers full 2VP-P into 150Ω loads on 5V supply. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed Gain of 2 | Eliminates external feedback resistors - reduces component count, layout area, and gain mismatch (<±0.4% typical). |
| Programmable Input Bias | Single resistor from BCV to GND sets identical DC bias for all three inputs - simplifies AC-coupled RGB interface design. |
| Independent Per-Channel Supplies | Enables optimized local decoupling and minimizes supply-induced crosstalk - measured XTalk <–80dB at 10MHz. |
| 0.8V Rail-to-Rail Output Swing | Delivers full 2VP-P video swing on 5V supply - avoids clipping in standard SD/HD video systems with 1Vpp–2Vpp nominal levels. |
| Enable/Shutdown Function | Reduces total supply current to 10µA in shutdown - supports power-gating in portable or multi-channel video systems. |
Applications
| RGB HD Video Amplifier | Coaxial Cable Driver |
|---|---|
|
Use Scenario: Driving RGB analog video signals from graphics processor to LCD projector input over short PCB traces. IC Role / Device Role / Timing Role: Triple buffer amplifier with fixed +2 gain and matched channel performance. Use Value: Maintains 0.02% differential gain and 0.05° differential phase across R/G/B channels - prevents color shift and hue error in high-definition projection. |
Use Scenario: Transmitting composite video or YPbPr signals over 75Ω coaxial cable to display or recording equipment. IC Role / Device Role / Timing Role: High-current line driver with 2200V/µs slew rate and ±100mA output capability. Use Value: Drives 75Ω loads directly without external termination or buffering - preserves signal rise/fall times below 1ns. |
| Low-Voltage ADC Driver | Single-Supply Video Distribution |
|
Use Scenario: Conditioning analog video prior to digitization in 3.3V or 5V ADC-based capture cards. IC Role / Device Role / Timing Role: Wideband gain stage with 500MHz bandwidth and low harmonic distortion. Use Value: Delivers –68dBc 2nd-harmonic and –75dBc 3rd-harmonic distortion at 10MHz - minimizes aliasing in sampled video systems. |
Use Scenario: Splitting one RGB source to multiple downstream displays or processing units using passive fanout. IC Role / Device Role / Timing Role: Active video splitter with independent channel enable and rail-swing optimization. Use Value: Enables simultaneous driving of ≥3 outputs via three dedicated amplifiers - avoids loading-induced bandwidth loss in passive distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple video amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT6558CDD#TRPBF | Gain of 1 (not 2); same 550MHz BW, 2200V/µs slew, and DFN package; no BCV pin. | Requires external gain-setting resistors for AV = 2; lacks programmable input bias - needs external clamp for AC coupling. | Select when unity-gain stability or minimal external components for AV = 1 are required; not drop-in for LT6557IDHC#TRPBF's fixed-gain, bias-controlled use cases. |
| LT6553IDHC#TRPBF | Higher 650MHz BW and same DFN package; fixed AV = 2; no BCV pin; optimized for 75Ω cable drive. | Lacks programmable input bias - requires external DC restoration; higher bandwidth suits faster pixel clocks but increases layout sensitivity. | Prefer for >1080p/60Hz RGB systems needing >500MHz signal fidelity; use only if external biasing is acceptable and BCV functionality is unnecessary. |
Compared with LT6557IDHC#TRPBF, LT6558CDD#TRPBF offers unity gain and no bias control, while LT6553IDHC#TRPBF trades bias programmability for higher bandwidth and cable-drive optimization - neither provides the exact combination of fixed AV = 2, BCV-controlled AC coupling, and 400MHz large-signal BW in a single 5V-supply solution.
Availability
LT6557IDHC#TRPBF is available at Aetrix Electronics and suitable for RGB HD video amplifiers, coaxial cable drivers, and low-voltage ADC driver applications requiring stable component supply, long-term industrial lifecycle support, and guaranteed temperature-grade performance.
Supply support for LT6557IDHC#TRPBF 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 LT6557 product line was designed specifically for high-fidelity, single-supply analog video signal conditioning - targeting LCD projectors, broadcast monitors, medical imaging displays, and professional video equipment where color accuracy, speed, and power efficiency are critical.
FAQ
What is the operating temperature range for LT6557IDHC#TRPBF?
The LT6557IDHC#TRPBF is specified for operation from –40°C to +85°C and is tested across this full range. Its DFN package has a maximum junction temperature of 125°C, and thermal design must ensure TJ remains below this limit under worst-case load and ambient conditions. The "I" grade designation confirms industrial-temperature qualification.
Does LT6557IDHC#TRPBF require external gain-setting resistors?
No, LT6557IDHC#TRPBF features an internal fixed gain of +2 and requires no external resistors to set gain. This eliminates gain mismatch between channels and reduces board space. External resistors are only needed if using the BCV pin for programmable input bias - a 348Ω resistor to GND sets nominal 1.25V bias, but the part functions correctly with BCV open for DC-coupled use.
How does the enable/shutdown function work on LT6557IDHC#TRPBF?
The EN pin (Pin 1) controls LT6557IDHC#TRPBF operation: pulling it low enables all three amplifiers; leaving it open applies an internal 40kΩ pull-up to V+, placing the device in shutdown mode with total supply current reduced to ~10µA. Enable response time is ~50ns; shutdown recovery takes ~1µs. CMOS logic gates or direct grounding provide robust control.
Can LT6557IDHC#TRPBF drive 75Ω coaxial cables directly?
Yes, LT6557IDHC#TRPBF delivers ±100mA output current and swings to within 0.8V of the 5V supply rails, enabling direct 75Ω cable drive with full 2VP-P video swing. Its 400MHz large-signal bandwidth and low differential phase (0.05°) ensure minimal distortion and timing skew - verified in typical applications using 500Ω source and 75Ω termination networks.
What is the purpose of separate V+ and GND pins for each channel in LT6557IDHC#TRPBF?
LT6557IDHC#TRPBF uses dedicated V+ R/G/B and GND R/G/B pins to isolate power and ground paths per channel - reducing supply coupling and improving channel-to-channel isolation. Measured hostile crosstalk is <–80dB at 10MHz, critical for RGB systems where leakage between color channels causes visible color contamination or ghosting in high-resolution video.
LT6557IDHC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- General Purpose
- Output Type:
- -
- Number of Circuits:
- 3
- -3db Bandwidth:
- 500 MHz
- Slew Rate:
- 2200V/µs
- Current - Supply:
- 22.5 mA
- Current - Output / Channel:
- 70 mA
- Voltage - Supply, Single/Dual (±):
- 3V ~ 7.5V, ±2.5V ~ 3.3V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-DFN (5x3)
LT6557IDHC#TRPBF FAQ
1.How can I place an order for LT6557IDHC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6557IDHC#TRPBF 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 LT6557IDHC#TRPBF reliable?
The price and inventory of LT6557IDHC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6557IDHC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT6557IDHC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6557IDHC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6557IDHC#TRPBF?
LT6557IDHC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6557IDHC#TRPBF 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 LT6557IDHC#TRPBF?
For technical support, including LT6557IDHC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6557IDHC#TRPBF requirements.
6.How does Aetrix verify that LT6557IDHC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT6557IDHC#TRPBF 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 LT6557IDHC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT6557IDHC#TRPBF?
All LT6557IDHC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6557IDHC#TRPBF, 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 LT6557IDHC#TRPBF part is unused and in its original packaging.
Return procedure for LT6557IDHC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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