LT6600-20 - Very Low Noise, Differential Amplifier And 20MHz Lowpass Filter
The LT6600-20 combines a fully Differential Amplifier with a 4th order 20MHz lowpass Filter approximating a Chebyshev frequency response. Most Differential Amplifiers require many precision external components to tailor gain and bandwidth. In contrast, with the LT6600-20 two extern 54f al resistors program differential gain, and the Filters 20MHz cutoff frequency and passband ripple are internally set. The LT6600-20 also provides the necessary level shifting to set its output common mode voltage to accommodate the reference voltage requirements of A/Ds.
Using a proprietary internal architecture, the LT6600-20 integrates an antialiasing Filter and a Differential Amplifier driver without compromising distortion or low noise performance. At unity gain the measured in band signal-to-noise ratio is an impressive 76dB. At higher gains the input referred noise decreases so the part CAN process smaller input differential signals without significantly degrading the output signal-to-noise ratio.
The LT6600-20 also features low voltage operation. The differential design provides outstanding performance for a 2VP-P signal level while the part operates with a single 3V supply.
The LT6600-20 is packaged in an SO-8 and is pin compatible with stand alone Differential Amplifiers
By Linear Technology Corporation
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