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LT6604-15 - Dual Very Low Noise, Differential Amplifier and 15MHz Lowpass Filter

The LT6604-15 consists of two matched, fully differential amplifiers, each with a 4th order, 15MHz lowpass filter. The fixed frequency lowpass filter approximates a Chebyshev response. By integrating a filter and a differential amplifier, distortion and noise are made exceptionally low. At unity gain, the measured in band signal-to-noise ratio is an impressive 76dB. At higher gains, the input referred noise decreases, allowing the part to process smaller input differential signals without significantly degrading the signal-to-noise ratio. Gain and phase are highly matched between the two channels. Gain for each channel is independently programmed using two external resistors. The LT6604-15 enables level shifting by providing an adjustable output common mode voltage, making it ideal for directly interfacing to ADCs. The LT6604-15 is fully specified for 3V operation. The differential design enables outstanding performance at a 2VP-P signal level for a single 3V supply. See the back page of this datasheet for a complete list of related single and dual differential amplifiers with integrated 2.5MHz to 20MHz lowpass filters.

Features Dual Differential Amplifier with 15MHz Lowpass Filters     4th Order Filters     Approximates Chebyshev Response     Guaranteed Phase and Gain Matching     Resistor-Programmable Differential Gain 76dB Signal-to-Noise (3V Supply, 2VP-P Output) Low Distortion, 2VP-P, 800Ω Load, VS = 3V     1MHz: 86dBc 2nd, 90dBc 3rd     10MHz: 63dBc 2nd, 69dBc 3rd Specified for Operation with 3V, 5V and ±5V Supplies Fully Differential Inputs and Outputs Adjustable Output Common Mode Voltage Small 4mm × 7mm × 0.75mm QFN Package Typical Application

Applications Dual Differential ADC Driver Plus Filter Single-Ended to Differential Converter Matched, Dual, Differential Filter Stage Common Mode Translation of Differential Signals High Speed ADC Antialiasing and DAC Smoothing in Wireless Infrastructure or Networking Applications High Speed Test and Measurement Equipment Medical Imaging Packaging

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