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LMH6518SQE bảng dữ liệu(PDF) 1 Page - Texas Instruments |
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1 / 40 page LMH6518 www.ti.com SNOSB21A – MAY 2008 – REVISED OCTOBER 2008 LMH6518 900 MHz, Digitally Controlled, Variable Gain Amplifier Check for Samples: LMH6518 1 FEATURES DESCRIPTION The LMH6518 is a digitally controlled variable gain 2 • Gain Range 40 dB amplifier whose total gain can be varied from −1.16 • Gain Step Size 2 dB dB to 38.8 dB for a 40 dB range in 2 dB steps. The • Combined Gain Resolution with −3 dB bandwidth is 900 MHz at all gains. Gain Gsample/Second ADC’s 8.5 mdB accuracy at each setting is typically 0.1 dB. When used in conjunction with a National Semiconductor • Min Gain −1.16 dB Gsample/second (Gsps) ADC with adjustable full • Max Gain 38.8 dB scale (FS) range, the LMH6518 gain adjustment will • −3 dB BW 900 MHz accommodate full scale input signals from 6.8 mVPP to 920 mVPP to get 700 mVPP nominal at the ADC • Rise/Fall Time <500 ps input. The Auxiliary output (“+OUT Aux” and “ −OUT • Recovery Time <5 ns Aux”) follows the Main output and is intended for use • Propagation Delay Variation 100 ps in Oscilloscope trigger function circuitry but may have other uses in other applications. • HD2 @ 100 MHz −50 dBc • HD3 @ 100 MHz −53 dBc The LMH6518 gain is programmed via a SPI-1 compatible serial bus. A signal path combined gain • Input-Referred Noise (Max Gain) 0.98 nV/ √Hz resolution of 8.5 mdB can be achieved when the • Over-Voltage Clamps for Fast Recovery LMH6518’s gain and the Gsps ADC’s FS input are • Power Consumption — Auxiliary Turned Off both manipulated. Inputs and outputs are DC- 1.1W0.75W coupled. The outputs are differential with individual Common Mode (CM) voltage control (for Main and Auxiliary outputs) and have a selectable bandwidth APPLICATIONS limiting circuitry (common to both Main and Auxiliary) • Oscilloscope Programmable Gain Amplifier of 20, 100, 200, 350, 650, 750 MHz or full bandwidth. • Differential ADC Drivers • High Frequency Single-Ended Input to Differential Conversion • Precision Gain Control Applications • Medical Applications • RF/IF Applications 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2008, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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