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NXP Semiconductors CGD985LCU
- Part No.:
- CGD985LCU
- Manufacturer:
- NXP Semiconductors
- Category:
- Video Amps and Modules
- Package:
- SOT-115AE
- Datasheet:
-
CGD985LCU.pdf
- Description:
- IC AMP CATV 8SIL
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
CGD985LCU from NXP Semiconductors is a hybrid GaAs HFET-based RF power doubler amplifier module designed for CATV line amplification, delivering 25 dB typical gain across 40 MHz to 1003 MHz at 24 V DC supply, with 365 mA total current (pin 4 floating), and optimized for 98 PAL D channel loading in 75 Ω systems.
For engineers reviewing the CGD985LCU datasheet, CGD985LCU pinout, CGD985LCU application, or CGD985LCU equivalent, this module's adjustable supply current via pin 4, unconditionally stable operation, flat frequency response up to 862 MHz, and low distortion performance under high-channel-count PAL D conditions are critical selection criteria.
Technical Context
The CGD985LCU employs dual GaAs HFET dies in a single-ended hybrid configuration, operating as a broadband power doubler with direct-coupled DC biasing. Its architecture enables gain compensation over temperature and maintains unconditional stability across the full 40–1003 MHz bandwidth without external stabilization networks.
Pin 4 serves as an ICC adjust terminal: grounding reduces total current to 315 mA (typ), while leaving it floating yields 365 mA (typ) - enabling trade-offs between power consumption and linearity. Input/output return loss exceeds 15 dB across the band, supporting robust 75 Ω system integration in cascaded CATV trunk and distribution amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Bandwidth | 40 MHz to 1003 MHz - supports full PAL D spectrum plus digital extensions up to 1 GHz. |
| Power Gain | 25 dB typ at 1003 MHz - ensures sufficient headroom for multi-stage amplification in 98-channel PAL D systems. |
| Composite Triple Beat (CTB) | −65 dBc typ at 862 MHz (98 PAL D channels, Vo = 48 dBmV) - meets stringent CATV distortion requirements. |
| Total Supply Current | 365 mA typ (pin 4 floating) - balances linearity and thermal load in thermally constrained housings. |
| Noise Figure | 5.5 dB typ at 1003 MHz - preserves upstream signal integrity in noise-sensitive node amplifiers. |
| Input/Output Return Loss | >15 dB from 870–1003 MHz - minimizes reflections and standing waves in 75 Ω coaxial plant. |
| Supply Voltage | 24 V DC - compatible with standard CATV power insertion infrastructure. |
Pinout & Package
CGD985LCU is housed in a rectangular single-ended SOT115AE package with aluminum flange, vertical/horizontal mounting holes, and 8 gold-plated in-line leads. The package provides mechanical ruggedness and efficient thermal dissipation for outdoor amplifier enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RF Input | 75 Ω matched input port; connects directly to preceding stage or splitter output. |
| 2, 3 | Common (Ground) | DC and RF ground reference points; must be low-inductance connected to chassis ground. |
| 4 | ICC Adjust | Current control terminal: floating → max current (365 mA); grounded → reduced current (315 mA). |
| 5 | +VB Supply | 24 V DC input; requires local decoupling near pin for RF stability. |
| 7, 8 | Common (Ground) | Secondary ground terminals; ensure symmetric grounding for balanced thermal and RF performance. |
| 9 | RF Output | 75 Ω matched output driving downstream splitter or next amplifier stage. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Supply Current | Pin 4 enables real-time optimization of current vs. linearity trade-off without hardware change. |
| Gain Compensation Over Temperature | Maintains consistent gain flatness across −20 °C to +100 °C mounting base temperature range. |
| Unconditional Stability | No external stabilization required - simplifies PCB layout and eliminates risk of oscillation in dense modules. |
| Thermally Optimized Flange Mount | Aluminum flange with vertical mounting holes enables direct heatsink attachment for sustained 365 mA operation. |
| Excellent Return Loss | >17 dB input/output return loss up to 640 MHz - reduces inter-stage mismatch losses in cascade designs. |
Applications
| CATV Trunk Amplifier | CATV Distribution Amplifier |
|---|---|
|
Use Scenario: Amplifying RF signals in underground or aerial trunk lines carrying 98 PAL D channels over distances up to 2 km. IC Role / Device Role / Timing Role: Power doubler stage providing broadband gain and distortion suppression before signal splitting. Use Value: Delivers −65 dBc CTB at 862 MHz with 24 V/365 mA operation, enabling longer trunk segments without repeaters. |
Use Scenario: Boosting signal strength prior to passive distribution to 16–32 subscriber drops in neighborhood nodes. IC Role / Device Role / Timing Role: Final-stage line driver ensuring flat 40–862 MHz response into multiple 75 Ω branches. Use Value: Maintains <0.8 dB flatness across band and >17 dB return loss, minimizing tilt-induced channel imbalance. |
| Headend Signal Conditioning | Two-Way CATV Node |
|
Use Scenario: Post-modulation amplification in headend rack units combining analog PAL D and digital QAM channels. IC Role / Device Role / Timing Role: High-linearity doubler handling mixed-signal loads (59 PAL D + 75 digital channels) up to 1003 MHz. Use Value: Achieves −72 dBc CTB and 62 dBc CCN at 1003 MHz, preserving MER and BER in dense channel environments. |
Use Scenario: Bidirectional node requiring low-noise upstream path and high-output downstream path in compact housing. IC Role / Device Role / Timing Role: Downstream power doubler with 5.5 dB NF at 1003 MHz and 25 dB gain for extended coverage. Use Value: Enables simultaneous support of legacy PAL D and modern digital services without redesigning RF front-end layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF power doubler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CGD985LCP | SOT115AE package variant with identical electrical specs but different lead finish (Pb-free vs. CGD985LCU's Pb-bearing finish per legacy spec). | Same CATV trunk/distribution use; requires requalification if RoHS-6 compliance is mandated. | Select CGD985LCP only when full RoHS-6 compliance is contractually required and Pb-free solder process is confirmed. |
| CGD985LCS | Same die and package, but specified for 28 V operation (max VB = 30 V) with higher Itot tolerance (up to 410 mA). | Better suited for 28 V-powered nodes or higher ambient temperature deployments (>35 °C Tmb). | Choose CGD985LCS when system voltage margin exceeds 24 V or thermal derating headroom is needed beyond 365 mA. |
Compared with CGD985LCU, CGD985LCP offers identical RF performance with Pb-free termination for newer environmental compliance, while CGD985LCS extends operational headroom at 28 V and elevated current - both require validation of mechanical fit and thermal interface compatibility despite shared SOT115AE footprint.
Availability
CGD985LCU is available at Aetrix Electronics and suitable for CATV trunk amplifiers, distribution amplifiers, headend signal conditioning units, and two-way node designs requiring stable component supply with long lifecycle assurance.
Supply support for CGD985LCU 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and communications markets, with deep expertise in RF power and analog signal processing.
The CGD985LCU belongs to NXP's CATV RF power amplifier family, engineered specifically for high-channel-count PAL D and hybrid analog/digital cable TV infrastructure demanding low distortion, thermal resilience, and field-proven reliability.
FAQ
What is the maximum supply voltage rating for CGD985LCU?
The CGD985LCU has an absolute maximum supply voltage (VB) of 30 V DC, as defined in IEC 60134 limiting values. Operation at 24 V DC is recommended for optimal linearity and thermal performance; exceeding 24 V increases current draw and junction temperature, potentially degrading CTB and CSO performance unless thermal management is enhanced.
How does pin 4 affect CGD985LCU performance in a live CATV system?
Pin 4 on the CGD985LCU controls total supply current: grounding it reduces Itot to 315 mA (typ), lowering power dissipation and heat rise but increasing CTB by ~7 dBc (to −58 dBc) at 862 MHz; leaving it floating maintains 365 mA (typ) and best-in-class −65 dBc CTB. System designers select based on thermal envelope vs. distortion budget.
Is CGD985LCU suitable for digital-only QAM channel loading?
Yes - the CGD985LCU is characterized for 59 PAL D + 75 digital channels (up to 1003 MHz), achieving −72 dBc CTB and 62 dBc CCN at Vo = 58.5 dBmV. Its 40–1003 MHz bandwidth, flat gain slope (<2.2 dB), and excellent return loss make it viable for all-digital cable plants, though thermal design must accommodate 365 mA at full load.
What is the input and output impedance of CGD985LCU?
The CGD985LCU is fully matched to 75 Ω at both input (pin 1) and output (pin 9) under standard test conditions (VB = 24 V, ZS = ZL = 75 Ω, Tmb = 35 °C). Input return loss exceeds 15 dB up to 1003 MHz, and output return loss remains >16 dB across the same band, ensuring minimal mismatch loss in standard CATV plant interfaces.
Does CGD985LCU require external biasing components or stability networks?
No - the CGD985LCU is unconditionally stable and internally biased. It requires only local 24 V DC decoupling (e.g., 100 nF + 10 µF) at pin 5 and proper RF grounding at pins 2, 3, 7, and 8. No external resistors, capacitors, or ferrites are needed for basic operation, reducing BOM count and layout complexity in space-constrained amplifier modules.
CGD985LCU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- SOT-115AE
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- CATV
- Output Type:
- -
- Number of Circuits:
- 1
- -3db Bandwidth:
- -
- Slew Rate:
- -
- Current - Supply:
- 365 mA
- Current - Output / Channel:
- -
- Voltage - Supply, Single/Dual (±):
- 24V
- Mounting Type:
- Chassis Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT115AE
CGD985LCU FAQ
1.How can I place an order for CGD985LCU through Aetrix?
Please submit a Request for Quotation (RFQ) for CGD985LCU 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 CGD985LCU reliable?
The price and inventory of CGD985LCU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CGD985LCU is usually 5 days.
3.What payment methods are accepted for CGD985LCU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CGD985LCU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CGD985LCU?
CGD985LCU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CGD985LCU 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 CGD985LCU?
For technical support, including CGD985LCU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CGD985LCU requirements.
6.How does Aetrix verify that CGD985LCU is sourced from the original manufacturer or authorized distributors?
All CGD985LCU 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 CGD985LCU meets industry standards.
7.What is the process for return or replacement of CGD985LCU?
All CGD985LCU units undergo pre-shipment inspection (PSI). If there is an issue with CGD985LCU, 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 CGD985LCU part is unused and in its original packaging.
Return procedure for CGD985LCU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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