Features and Benefits
- 10GHz Gain-Bandwidth Product
- 88dB SFDR at 100MHz, 2VP-P
- 1.1nV/√Hz Input Noise Density
- Input Range Includes Ground
- External Resistors Set Gain (Min 1V/V)
- 3300V/μs Differential Slew Rate
- 52mA Supply Current
- 2.7V to 5.25V Supply Voltage Range
- Fully Differential Input and Output
- Adjustable Output Common Mode Voltage
- Low Power Shutdown
- Small 10-Lead 3mm × 2mm × 0.75mm QFN Package
The LTC6409 is a very high speed, low distortion, differential amplifier. Its input common mode range includes ground, so that a ground-referenced input signal can be DC-coupled, level-shifted, and converted to drive an ADC differentially.
The gain and feedback resistors are external, so that the exact gain and frequency response can be tailored to each application. For example, the amplifier could be externally compensated in a no-overshoot configuration, which is desired in certain time-domain applications.
The LTC6409 is stable in a differential gain of 1. This allows for a low output noise in applications where gain is not desired. It draws 52mA of supply current and has a hardware shutdown feature which reduces current consumption to 100μA.
The LTC6409 is available in a compact 3mm × 2mm 10‑pin leadless QFN package and operates over a –40°C to 125°C temperature range.
- Differential Pipeline ADC Driver
- High-Speed Data-Acquisition Cards
- Automated Test Equipment
- Time Domain Reflectometry
- Communications Receivers
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (4)
DC1945A: Demo Board for the LTC2185 - 16-Bit, 125Msps Low Power Dual ADCs and LTC6409 - 10GHz GBW, 1.1nV/√Hz Differential Amplifier/ADC Driver.
DC1591A: Demo Board for the LTC6409 10GHz GBW, 1.1nV/√Hz Differential Amplifier/ADC Driver.
Demonstration circuit 2266A features the LTC2107, 210Msps ADC, and the LTC6409 low noise amplifier. DC2266A supports the LTC2107 DDR LVDS output mode.
The circuitry on the analog inputs is optimized for analog input frequencies from DC to 100MHz. When driven with a 50Ω source, the gain will be 6dB. To modify the input for other input ranges or gains refer to the LTC6409 data sheet.
DC1760A Demo Board for:
LTC2261-14 14-Bit, 125Msps Ultra-Low Power 1.8V ADCs
LTC6409 10GHz GBW, 1.1nV/√Hz Differential Amplifier/ADC Driver
Documentation & Resources
R561 Reliability Data3/23/2018
High Speed Amplifiers/ADC Drivers4/29/2015
88dB SFDR @ 100MHz6/27/2011
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
Sys-Parameter models contain behavioral parameters, such as P1dB, IP3, gain, noise figure and return loss, which describe nonlinear and linear characteristics of a device.
ADI's new ADI DiffAmpCalc™ is a free, downloadable calculator for designing differential amplifier circuits. The tool is easy to use and features an interactive user interface to quickly get you up and running.
ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.
LTC6409 Companion Parts
Recommended Related Parts
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.