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AD9689 input range

According to the  reference design, we placed a bal-006 in front of the ADC input, so that the amplitude of the ADC sampling signal is indeed reduced by about 6dB. My input signal is actually a 1G analog single ended signal. What should I do to ensure that the output signal of the ADC can truly reflect the amplitude of the input signal? Delete the bal006 chip, or modify the register to increase the input gain?