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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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LMH6514 600 MHz, Digital Controlled, Variable Gain Amplifier datasheet (Rev. A) | 18 Mar 2013 | |
| E-book | The Signal e-book: A compendium of blog posts on op amp design topics | 28 Mar 2017 | ||
| Application note | AN-1719 Noise Figure Analysis Fully Differential Amplifier (Rev. A) | 01 May 2013 | ||
| User guide | LMH6514 Digital Controlled Variable Gain Amplifier Evaluation Board (Rev. A) | 01 May 2013 | ||
| Application note | Using High Speed Diff Amp to Drive ADCs (Rev. A) | 26 Apr 2013 | ||
| Application note | Selecting Amplifiers, ADCs, and Clocks for High-Performance Signal Paths | 13 Sep 2007 | ||
| Application note | A Walk Along the Signal Path (High-Speed Signal Path) | 30 Mar 2005 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN (RGH) | 16 | Ultra Librarian |
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