LMH6514SQE/NOPB

LMH6514 www.ti.com SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier Check for Samples: LMH6514 FEATURES DESCRIPTION • • • • • • • • The LMH6514 is a high performance, digitally controlled variable gain amplifier (DVGA). It combines precision gain control with a low noise, ultra-linear, differential amplifier. Typically, the LMH6514 drives a high performance ADC in a broad range of mixed signal and digital communication applications such as mobile radio and cellular base stations where automatic gain control (AGC) is required to increase system dynamic range. When used in conjunction with a high speed ADC, system dynamic range can be extended by up to 42 dB. 1 2 Adjustable Gain with a 42 dB Range Precise 6.02 dB Gain Steps Parallel 3 Bit Gain Control On Chip Register Gain Setting Fully Differential Signal Path Single Ended to Differential Capable 200Ω Input Impedance Small Footprint (4 mm x 4 mm) WQFN Package APPLICATIONS • • • • • • The LMH6514 has a differential input and output allowing large signal swings on a single 5V supply. It is designed to accept signals from RF elements and maintain a terminated impedance environment. The input impedance is 200Ω resistive. The output impedance is either 200Ω or 400Ω and is user selectable. A unique internal architecture allows use with both single ended and differential input signals. Cellular Base Stations IF Sampling Receivers Instrumentation Modems Imaging Differential Line Receiver KEY SPECIFICATIONS • • • • • • • 600 MHz bandwidth at 100Ω load 39 dBm OIP3 at 75 MHz, 200Ω load 26 dB to 38 dB maximum gain Selectable output impedance of 200Ω or 400Ω. 8.3 dB noise figure 5 ns gain step switching time 100 mA supply current Input signals to the LMH6514 are scaled by a highly linear, digitally controlled attenuator with seven accurate 6 dB steps. The attenuator output provides the input signal for a high gain, ultra linear differential transconductor. The transconductor differential output current can be converted into a voltage by using the on-chip 200Ω or 400Ω loads. The transconductance gain is 0.1 Amp/Volt resulting in a maximum voltage gain of +32 dB when driving a 200Ω load, or 38 dB when driving the 400Ω load. 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. Typical Application VCC LO RLOAD RF ROUT 200 LMH6514 ADC14155 3 GAIN LATCH 1 2 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. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2008–2013, Texas Instruments Incorporated LMH6514 SNOSB06A – JANUARY 2008 – REVISED MARCH 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) (2) ESD Tolerance (3) Human Body Model 2 kV Machine Model 150V Positive Supply Voltage (Pin 3) −0.6V to 5.5V Output Voltage (Pin 14,15) −0.6V to 6.8V Differential Voltage between Any Two Grounds