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LTC6430-20 - High Linearity Differential RF/IF Amplifier/ADC Driver

The LTC®6430-20 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 LTC6430-20 operates from a single 5V power supply and consumes only 850mW.

In its differential configuration, the LTC6430-20 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 creates a high fidelity 40MHz to 1000MHz 75Ω CATV amplifier.

The LTC6430-20 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 LTC6430-20 uses a high performance SiGe BiCMOS process for excellent repeatability compared with similar GaAs amplifiers. All A-grade LTC6430-20 devices are tested and guaranteed for OIP3 at 380MHz. The LTC6430-20 is housed in a 4mm × 4mm, 24-lead, QFN package with an exposed pad for thermal management and low inductance. A single-ended 50Ω IF gain block with similar performance is also available, see the related LTC6431-20.

Features 51.0dBm OIP3 at 240MHz into a 100Ω Diff Load NF = 2.9dB at 240MHz 20MHz to 2060MHz –3dB Bandwidth 20.8dB Gain A-Grade 100% OIP3 Tested at 380MHz 0.6nV/√Hz Total Input Noise S11 < –10dB Up to 1.4GHz S22 < –10dB Up to 1.4GHz >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 = 850mW 4mm × 4mm, 24-Lead QFN Package Typical Application

Applications Differential ADC Driver Differential IF Amplifier OFDM Signal Chain Amplifier 50Ω Balanced IF Amplifier 75Ω CATV Amplifier 700MHz to 800MHz LTE Amplifier Low Phase Noise Clock or LO Amplifier Packaging

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