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AD9970 CDS gain相关问题

dhcamera 在 2018-8-3 詢問的問題

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     请教一下AD9970芯片CDS增益设置的问题。AD9970手册中,对CDS要求如图1,有最大输入电压要求。CDS gain=6db时,最大输入电压为0.5Vp-p,手册中提及“The CDS gain is variable in four steps by using the AFE Address 0x04: −3 dB, 0 dB (default), +3 dB, and +6 dB. Improved noise performance results from using the +3 dB and +6 dB settings, but the input range is reduced (see Table 3).”

     请问,如果CCD_OUT波形如图2所示,CDS gain设置为6db,此时AD9970输入电压实际生效值为多少?CDS电路是否会对电压进行钳位?

图1:

CDS gain.png

图2:

CCD_OUT.png

結果