ADG46+1/ADG46+3
Positive Fault Condition
BIPOLAR OPERATION AND SINGLE-SUPPLY
OPERATION
If the analog input exceeds VDD by a threshold voltage, VT, then
the switch turns off and is in isolation mode. The part can handle a
fault of up to 16 V, referenced to the most negative signal. For
example, if VDD= 5 V, VSS = 0 V, then the switch protects against
an overvoltage of up to 16 V. If VSS = −5 V and VDD = +5 V, then
the switch protects against an overvoltage of up to +11 V.
The ADG4612/ADG4613 have a maximum operational range
from VDD to VSS of 16 V. The maximum signal range from source
to drain, VS to VD , is also 16 V. During operation of the device,
the signal range can exceed the power supply rails, but the voltage
between the most negative voltage on the device (VS,VD or VSS)
should be within 16 V of the most positive voltage (VS, VD, INx,
or VDD). These voltage ratings should be adhered to at all times
for guaranteed functionality. See Table 5 for guaranteed supply
ranges. Signal ranges and power supply ranges exceeding 16 V
may affect the long-term reliability of the device.
Negative Fault Condition; Negative Signal Handling
The ADG4612/ADG4613 are not damaged if the analog inputs
exceed the negative supply, VSS. If the switch is in the off condition,
the switch blocks a signal up to −5.5 V. If the switch is in the on
condition, the switch remains on, and the negative signal is passed
to the output; therefore, the ADG4612/ADG4613 can pass a
negative signal up to −5.5 V with VSS = 0 V. The user must ensure
that the downstream circuitry can handle this signal level. Also,
the user should ensure the voltage between the most negative
voltage on the device (VS ,VD or VSS) is within 16 V of the most
positive voltage (VS, VD, INx, or VDD).
The ground pin must always be connected to the GND
potential to ensure proper functionality in isolation and
normal operation mode.
The minimum VDD voltage that the part is guaranteed operational
is 2.7 V. The maximum recommended VDD voltage is 16 V.
The minimum supply voltage recommended on VSS is −5.5 V,
and the maximum voltage allowable on VSS is 0 V. Therefore,
given that the VDD to VSS range is 16 V maximum when, VSS
=
−5.5 V, the VDD = +10.5 V maximum.
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