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# AD7676 with AD8021 drivers

We have a telemetry deck that uses AD8021s as a single-ended to differential driver for an AD7676 PulSAR ADC as documented in the AD7676 data sheet.  We want to make sure that when using +/12V supplies for the AD8021s, their inherent current limiting is sufficient to prevent damage to the AD7676 input and its protection diodes.  Thank you.

Parents
• Hi,

Yes, Table 2 of the AD8021 datasheet specifies the output short circuit current to be 115mA typically and Figure 27 on page 12 shows the short circuit current to ground to be less than 100mA across temperature for +/-12V supplies.

Please note that the 120mA maximum forward bias current the diodes on the AD7676 analog inputs is not meant as a steady state condition so. the overvoltage condition should be a transient event and not a continuous one.

Regards,

Karen

Reply
• Hi,

Yes, Table 2 of the AD8021 datasheet specifies the output short circuit current to be 115mA typically and Figure 27 on page 12 shows the short circuit current to ground to be less than 100mA across temperature for +/-12V supplies.

Please note that the 120mA maximum forward bias current the diodes on the AD7676 analog inputs is not meant as a steady state condition so. the overvoltage condition should be a transient event and not a continuous one.

Regards,

Karen

Children
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