LMH6518SQE Datasheet

Special Purpose Amplifiers


The LMH6518SQE is a digitally controlled variable gain amplifier whose total gain can be varied from −1.16 dB to 38.84 dB for a 40 dB range in 2 dB steps. The −3 dB bandwidth is 825 MHz at all gains. Gain accuracy at each setting is typically 0.1 dB. When used in conjunction with a National Semiconductor Gsample/second (Gsps) ADC with adjustable full scale (FS) range, the LMH6518SQE gain adjustment will accommodate full scale input signals from 6.8 mVPP to 920 mVPP. The LMH6518 gain is programmed via a SPI-1 serial bus. A signal path combined gain resolution of 8.5 mdB can be achieved when the LMH6518’s gain and the Gsps ADC’s FS input are both manipulated. Propagation Delay variation across gain settings is typically 100 ps. 2nd/3rd order harmonic distortion is −50/−53 dBc at 100 MHz. Inputs and outputs are dc-coupled. The outputs are differential with individual Common Mode (CM) voltage control (for Main and Auxiliary outputs) and have a selectable bandwidth limiting circuitry (common to both Main & Auxiliary) of 20, 100, 200, 350, 650 MHz, 750 MHz or full bandwidth. The Auxiliary output (“OUT PA” and “OUT NA”) follows the Main output and is intended for use in Oscilloscope trigger function circuitry but may have other uses in other applications. LMH6518SQE Features • Gain range 40 dB• Gain step size 2 dB• Combined gain resolution with Gsample/second ADC’s 8.5 mdB• Min gain −1.16 dB• Max gain 38.84 dB• −3 dB BW 825 MHz• Rise/fall time 500 ps• Recovery time 5 ns• Propagation delay variation 100 ps• HD2 @ 100 MHz −50 dBc• HD3 @ 100 MHz −53 dBc• Input-referred noise (max gain) 0.93 nV/√Hz• Power consumption 1.1W LMH6518SQE Applications • Oscilloscope programmable gain amplifier• Differential ADC drivers• High frequency single ended input to differential conversion• Precision gain control applications• Medical applications• RF/ IF applications


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Manufacturer information


ON Semiconductor - ON Semiconductor (Nasdaq: ON) is driving energy efficient innovations, empowering customers to reduce global energy use. The company offers a comprehensive portfolio of energy efficient power and signal management, logic, discrete and custom solutions to help design engineers solve their unique design challenges in automotive, communications, computing, consumer, industrial, LED lighting, medical, military/aerospace and power supply applications. ON Semiconductor operates a responsive, reliable, world-class supply chain and quality program, and a network of manufacturing facilities, sales offices and design centers in key markets throughout North America, Europe, and the Asia Pacific regions.

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