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LMH6514SQXNOPB Datasheet(PDF) 1 Page - Texas Instruments |
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LMH6514SQXNOPB Datasheet(HTML) 1 Page - Texas Instruments |
1 / 29 page LMH6514 www.ti.com SNOSB06 – JANUARY 2008 LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier Check for Samples: LMH6514 1 FEATURES DESCRIPTION The LMH6514 is a high performance, digitally 2 • Adjustable Gain with a 42 dB Range controlled variable gain amplifier (DVGA). It combines • Precise 6.02 dB Gain Steps precision gain control with a low noise, ultra-linear, • Parallel 3 Bit Gain Control differential amplifier. Typically, the LMH6514 drives a high performance ADC in a broad range of mixed • On Chip Register Gain Setting signal and digital communication applications such as • Fully Differential Signal Path mobile radio and cellular base stations where • Single Ended to Differential Capable automatic gain control (AGC) is required to increase system dynamic range. When used in conjunction • 200 Ω Input Impedance with a high speed ADC, system dynamic range can • Small Footprint (4 mm x 4 mm) WQFN Package be extended by up to 42 dB. The LMH6514 has a differential input and output APPLICATIONS allowing large signal swings on a single 5V supply. It • Cellular Base Stations is designed to accept signals from RF elements and • IF Sampling Receivers maintain a terminated impedance environment. The input impedance is 200 Ω resistive. The output • Instrumentation impedance is either 200 Ω or 400Ω and is user • Modems selectable. A unique internal architecture allows use • Imaging with both single ended and differential input signals. • Differential Line Receiver Input signals to the LMH6514 are scaled by a highly linear, digitally controlled attenuator with seven KEY SPECIFICATIONS accurate 6 dB steps. The attenuator output provides the input signal for a high gain, ultra linear differential • 600 MHz bandwidth at 100 Ω load transconductor. The transconductor differential output • 39 dBm OIP3 at 75 MHz, 200 Ω load current can be converted into a voltage by using the • 26 dB to 38 dB maximum gain on-chip 200 Ω or 400Ω loads. The transconductance gain is 0.1 Amp/Volt resulting in a maximum voltage • Selectable output impedance of 200 Ω or 400Ω. gain of +32 dB when driving a 200 Ω load, or 38 dB • 8.3 dB noise figure when driving the 400 Ω load. On chip digital latches • 5 ns gain step switching time are provided for local storage of the gain setting. The gain step settling time is 5 ns and care has been • 100 mA supply current taken to reduce the sensitivity of bandwidth and phase to gain setting. The LMH6514 operates over the industrial temperature range of −40°C to +85°C. The LMH6514 is available in a 16-Pin, thermally enhanced, WQFN package. 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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