80-Msample/s 14-Bit ADC Takes On 500-MHz Inputs

April 26, 2004
It's crucial for cellular basestation designers to get the most dynamic performance out of their components. A new option, the LT1750 14-bit analog-to-digital converter (ADC) from Linear Technology, samples at 80 Msamples/s while accepting input...

It's crucial for cellular basestation designers to get the most dynamic performance out of their components. A new option, the LT1750 14-bit analog-to-digital converter (ADC) from Linear Technology, samples at 80 Msamples/s while accepting input signals up to 500 MHz.

This ADC delivers a spurious-free dynamic range (SFDR) of −84 dB at 140 MHz. Even with a 350-MHz input, SFDR measures −74 dB. Its signal-to-noise ratio (SNR) is rated at −71.7 dB at a 140-MHz input as well. Selectable input ranges are available from 1.3 to 2.25 V p-p. The output ranges from 0.5 to 5 V.

An on-chip programmable-gain amplifier (PGA) permits the use of multiple input ranges that lower noise levels and make it easier to meet IP3 communications requirements. An overflow pin enables automatic indication of an input that exceeds the rated range. A separate digital-output supply pin makes it possible to connect to low-voltage DSPs, FIFOs, or logic as low as 0.5 V.

The LT1750 dissipates 1.45 W and operates from a single 5-V supply. It comes in a 48-pin TSSOP package and is rated for operation over the commercial and industrial temperature ranges. Pricing for the converter begins at $32.30 each in quantities of 1000 units.

Linear Technology Corp. www.linear.com (408) 432-1900

About the Author

Roger Allan

Roger Allan is an electronics journalism veteran, and served as Electronic Design's Executive Editor for 15 of those years. He has covered just about every technology beat from semiconductors, components, packaging and power devices, to communications, test and measurement, automotive electronics, robotics, medical electronics, military electronics, robotics, and industrial electronics. His specialties include MEMS and nanoelectronics technologies. He is a contributor to the McGraw Hill Annual Encyclopedia of Science and Technology. He is also a Life Senior Member of the IEEE and holds a BSEE from New York University's School of Engineering and Science. Roger has worked for major electronics magazines besides Electronic Design, including the IEEE Spectrum, Electronics, EDN, Electronic Products, and the British New Scientist. He also has working experience in the electronics industry as a design engineer in filters, power supplies and control systems.

After his retirement from Electronic Design Magazine, He has been extensively contributing articles for Penton’s Electronic Design, Power Electronics Technology, Energy Efficiency and Technology (EE&T) and Microwaves RF Magazine, covering all of the aforementioned electronics segments as well as energy efficiency, harvesting and related technologies. He has also contributed articles to other electronics technology magazines worldwide.

He is a “jack of all trades and a master in leading-edge technologies” like MEMS, nanolectronics, autonomous vehicles, artificial intelligence, military electronics, biometrics, implantable medical devices, and energy harvesting and related technologies.

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