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General description

The TDA9901 is a wideband, low-noise amplifier with differential inputs and outputs. The TDA9901 incorporates an Automatic Gain Control (AGC) function with digital control. The TDA9901 is optimized for fast switching between different gain settings, preserving small phase and amplitude error.

Features

■ 130 MHz, ?3 dB small signal bandwidth

■ Digitally controlled gain

■ Transistor-Transistor Logic (TTL) and CMOS compatible digital inputs (3.3 V or 5 V)

■ TTL single-ended or differential clock input with Positive Emitter-Coupled Logic (PECL) compatibility

■ 24 dB gain control range

■ Four steps of 6 dB plus 6 dB fixed gain

■ 30 dB gain maximum

■ High impedance differential inputs

■ Low impedance differential inputs

■ High power supply rejection

■ 125 nV/√Hz output voltage noise density at 30 dB gain

■ Fast gain settling

■ Dual control modes: transparent or latched

Applications

■ Linear AGC systems

■ Wireless infrastructure

■ Fixed network

■ Instrumentation

■ Multipurpose amplifier

■ Driver for differential ADCs (e.g. ADC1206S040/055/070 and ADC1006055/070)