AD654 Fout's state on 0Hz output.

Question

Hi, guys. Thank you for your support. 
 
 According to Figure 1 and Figure 2 of the AD654 data sheet, Fout = 0 Hz when VIN = 0 V. 
 Please let me know that BJT of Fout is ON or OFF at this time?

Best regard. 
 Yuki.

andreialejandro · Accepted Answer

Hi Yuki, 
 The state of the BJT is at OFF state. In this case, the amplifier is a voltage to current converter. Since the input in the amplifier is VIN = 0V, there is no current driving the BJT so it's in the cut-off region. 
 The AD654 is an old product so it's not recommended for new designs. I suggest using new ADC's to have better performance and features. 
 Regards, 
 Andrei)

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AD654 Fout's state on 0Hz output.