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THS4226: THS4226

Part Number: THS4226
Other Parts Discussed in Thread: THS4225

The THS4226 datasheet includes the THS4225, both of which have Power Down inputs, but the THS4225 has a reference input to select how far the PD pin must swing to go to power down, while the 4226 implies, but does not state specifically that an internal (not pinned out) reference is the positive power supply.  The discussion shifts to the THS4225 and there is no specification for the THS4226 threshold or input current, beyond saying it is related to the rail voltages as described and the description is never addressed.  Tables cover thresholds where a Reference Pin exists, but not where one is not available.  My question is: For a +5v, -5v power supply with ground as the midpoint, does the PD1/PD2 pin(s) have to go below ground to go to power down, and how much current will flow in the PD pin circuit?