CATV amplifier has wide dynamic




Description

The LTC®6430-15 is a differential gain block amplifier designed to drive high resolution, high speed ADCs with excellent linearity beyond 1000MHz and with low associated output noise. The LTC6430-15 operates from a single 5V power supply and consumes only 800mW.

In its differential configuration, the LTC6430-15 can directly drive the differential inputs of an ADC. Using 1:2 baluns, the device makes an excellent 50Ω wideband balanced amplifier. While using 1:1.33 baluns, the device makes a high fidelity 50MHz to 1000MHz 75Ω CATV amplifier.

The LTC6430-15 is designed for ease of use, requiring a minimum of support components. The device is internally matched to 100Ω differential source/load impedance. Onchip bias and temperature compensation ensure consistent performance over environmental changes.

The LTC6430-15 uses a high performance SiGe BiCMOS process for excellent repeatability compared with similar GaAs amplifiers. All A-grade LTC6430-15 devices are tested and guaranteed for OIP3 at 240MHz. The LTC6430-15 is housed in a 4mm × 4mm, 24-lead, QFN package with an exposed pad for thermal management and low inductance. For a single-ended 50Ω IF gain block with similar performance, see the related LTC6431-15.

Features

  • 50.0dBm OIP3 at 240MHz into a 100Ω Diff Load
  • NF = 3.0dB at 240MHz
  • 20MHz to 2000MHz Bandwidth
  • 15.2dB Gain
  • A-Grade 100% OIP3 Tested at 240MHz
  • 1.0nV/√Hz Total Input Noise
  • S11 < –15dB Up to 1.2GHz
  • S22 < –15dB Up to 1.2GHz
  • >2.75VP-P Linear Output Swing
  • P1dB = 24.0dBm
  • Insensitive to VCC Variation
  • 100Ω Differential Gain-Block Operation
  • Input/Output Internally Matched to 100Ω Diff
  • Single 5V Supply
  • DC Power = 800mW
  • Unconditionally Stable
  • 4mm × 4mm, 24-Lead QFN Package
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CATV amplifier has wide dynamic range in 100ohm

Linear Technology has introduced a 15dB amplifier dynamic range from 20MHz to 1GHz in 100ohm differential designs.

Two performance grades are available: at 240MHz, the A-grade OIP3 is typically 50dBm and is fully tested and guaranteed to be a minimum of 47dBm.

Noise Figure is 3dB, which corresponds to an input-referred amplifier noise of 1nV/?Hz. DC power consumption is 800mW.
Suitable for the wide dynamic range needs of high performance intermediate frequency communications and CATV applications, the LTC6430-15 has internally matched 100Ohm differential inputs and outputs.

Two 1:2 baluns, DC blocking capacitors, and RF bias chokes are all that is needed externally to achieve a wideband 50ohm balanced amplifier in communications applications, said the supplier.

With two 1:1.33 baluns, the LTC6430-15 can be used as a high fidelity 75Ohm CATV amplifier.

The LTC6430-15 is available in a 4mm x 4mm QFN-24 package.

 

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