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Q&A AD654 Fout's state on 0Hz output.

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AD654 Fout's state on 0Hz output.

Yuki. on May 6, 2021

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.

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andreialejandro
May 6, 2021 +1 verified
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…

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+1 andreialejandro

on May 6, 2021 9:38 AM
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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0 Yuki. on May 6, 2021 10:39 AM in reply to andreialejandro

Hi, Andrei

Thank you for your quick reply.

Regards,

Yuki.
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0 Yuki. on May 6, 2021 10:39 AM in reply to andreialejandro

Hi, Andrei

Thank you for your quick reply.

Regards,

Yuki.
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