LMH6514 Series
600 MHz, Digital Controlled, Variable Gain Amplifier with 6.02dB Steps
Manufacturer: Texas Instruments
Catalog
600 MHz, Digital Controlled, Variable Gain Amplifier with 6.02dB Steps
Key Features
• Adjustable Gain with a 42 dB RangePrecise 6.02 dB Gain StepsParallel 3 Bit Gain ControlOn Chip Register Gain SettingFully Differential Signal PathSingle Ended to Differential Capable200Ω Input ImpedanceSmall Footprint (4 mm x 4 mm) WQFN PackageKey Specifications600 MHz bandwidth at 100Ω load39 dBm OIP3 at 75 MHz, 200Ω load26 dB to 38 dB maximum gainSelectable output impedance of 200Ω or 400Ω.8.3 dB noise figure5 ns gain step switching time100 mA supply currentAll trademarks are the property of their respective owners.Adjustable Gain with a 42 dB RangePrecise 6.02 dB Gain StepsParallel 3 Bit Gain ControlOn Chip Register Gain SettingFully Differential Signal PathSingle Ended to Differential Capable200Ω Input ImpedanceSmall Footprint (4 mm x 4 mm) WQFN PackageKey Specifications600 MHz bandwidth at 100Ω load39 dBm OIP3 at 75 MHz, 200Ω load26 dB to 38 dB maximum gainSelectable output impedance of 200Ω or 400Ω.8.3 dB noise figure5 ns gain step switching time100 mA supply currentAll trademarks are the property of their respective owners.
Description
AI
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.
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.
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.
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.
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.
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.
