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LT6604-2.5 - Dual Very Low Noise, Differential Amplifier and 2.5MHz Lowpass Filter

The LT6604-2.5 consists of two matched, fully differential amplifiers, each with a 4th order, 2.5MHz 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 86dB. 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 well matched between the two channels. Gain for each channel is independently programmed using two external resistors. The LT6604-2.5 enables level shifting by providing an adjustable output common mode voltage, making it ideal for directly interfacing to ADCs. The LT6604-2.5 is fully specified for 3V operation. The differential design enables outstanding performance up to a 4VP-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 2.5MHz Lowpass Filters    4th Order Filters    Approximates Chebyshev Response    Guaranteed Phase and Gain Matching    Resistor-Programmable Differential Gain >86dB Signal-to-Noise (3V Supply, 1VRMS Output) Low Distortion (1MHz, 1VRMS Output, 800Ω Load)    HD2: 92dBc    HD3: 88dBc 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 and Filter Single-Ended to Differential Converter Matched, Dual, Differential Gain or 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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