Product category:
Analogue and Mixed Signal ICs
News Release from: Linear Technology Corp | Subject: LTC6400-20 and LTC6401-20
Edited by the Electronicstalk Editorial
Team on 15 November 2007
ADC drivers promise top performance
Differential amplifiers include gain setting resistors to simplify the challenge of driving the highest performance high-speed ADCs.
Linear Technology reckons its latest ADC drivers achieve unprecedented performance from a single 3V supply The LTC6400-20 and LTC6401-20 are fully differential amplifiers that include gain setting resistors, simplifying the challenge of driving the highest performance high-speed ADCs
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC6400-20 provides a fixed gain of 20dB with -93dBc third-order intermodulation distortion (IMD3) performance and noise figure of 6.5dB for a 140MHz input frequency.
At 240MHz, IMD3 is better than -70dBc.
Other family members with fixed gains ranging from 8dB to 26dB will follow.
The LTC6400-20 achieves this outstanding performance operating on a 3V supply voltage, providing a differential output voltage swing of 4.4V peak-peak.
In addition to minimising power consumption, this eliminates the need for a separate 5V supply in applications using the latest 3 and 3.3V ADCs.
To further simplify interfacing to high speed ADCs such as the LTC2208, a single pin sets the output common mode voltage of the LTC6400-20 to match the input range of the ADC.
An optional on-chip filter helps to handle charge injection common to the capacitive inputs characteristic of pipelined ADCs.
Inputs may be AC- or DC-coupled.
Although fully differential, the LTC6400-20 can be used to easily convert single-ended inputs to differential outputs.
The LTC6401-20 is a lower-power part optimised for lower input frequencies.
Consuming just 50mA, half that of the LTC6400-20, the LTC6401-20 maintains the same low noise performance and -90dBc distortion performance for input frequencies up to 70MHz.
"The LTC6400-20 is the first of a family of parts that achieves excellent noise and distortion performance from DC to hundreds of megahertz", says Kris Lokere, Design Manager.
"In addition to driving ADCs in communications and instrumentation applications, it will find many applications as a high performance differential driver and receiver".
These parts are now available in tiny 3 x 3mm 16-lead QFN packages, starting at US $3.68 each for the LTC6400-20 and US $2.95 each for the LTC6401-20 in 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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