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ADS1675增加PGA前级,增益带宽如何选择?

Other Parts Discussed in Thread: ADS1675, THS4503, PGA870

我的被采样信号大约在1M左右,用ADS1675,24位,4M采样速率,前置放大用LT1028,AD797的话,相位将延迟1uS左右,用什么低噪声前放较好?我想在放大器与AD之间增加PGA电路,请问哪种PGA合适?PGA870是否合适?THS4503驱动是否必要?有没有合适的电路拓扑?