Analog Devices Inc.

Category: Integrated Circuits (ICs)

The ADG465 is a single channel protector that comes in SOT-23and MSOP packages. The channel protector is in series with thesignal path and protects sensitive components from voltagetransience in the signal path whether or not the power suppliesare present. Because the channel protection works regardless ofthe presence of the supplies, the channel protectors are ideal foruse in applications where correct power sequencing cannotalways be guaranteed to protect the analog inputs (for example, hotinsertion rack systems).A channel protector consists of an N channel, metal-oxidesemiconductor field-effect transistor (MOSFET), a P channelMOSFET, and another N channel MOSFET connected in series.The channel protector behaves like a series resistor during normaloperation, that is, (VSS + 1.5 V) < VIN < (VDD − 1.5 V). When theanalog input of a channel exceeds the power supplies (includingVDD and VSS = 0 V), one of the MOSFETs switches off, clampingthe output to either VSS + 1.5 V or VDD − 1.5 V. Circuitry andsignal source protection are provided in the event of an overvoltageor power loss. The channel protectors can withstand overvoltageinputs from −40 V to +40 V.The ADG465 can operate from both bipolar and unipolar supplies.The channels are normally on when power is connected, andopen circuit when power is disconnected. With power supplies of±15 V, the on resistance of the ADG465 is 80 Ω typical, with aleakage current of ±1 nA maximum. When power is disconnected,the input leakage current is approximately ±0.005 μA typical.The ADG465 is available in a 6-lead SOT-23 package, and an8-lead MSOP package.Product Highlights Fault Protection. The ADG465 can withstand continuous voltage inputs from −40 V to +40 V. When a fault occurs due to the power supplies being turned off, or due to an overvoltage being applied to the ADG465, the output is clamped. When power is turned off, current is limited to the nanoampere level. Low Power Dissipation. Low RON 80 Ω typical. Trench Isolation Latch-Up Proof Construction. A dielectric trench separates the P channel and the N channel MOSFETs thereby preventing latch up. Applications ATE Equipment Sensitive measurement equipment Hot insertion rack systems ADC input channel protection

$5.50 - * $6.09