ADG467BR-REEL7

ADG467BR-REEL7 FEATURES

Fault and overvoltage protection up to ±40 VSignal paths open circuit with power offSignal path resistance of RON with power on44 V supply maximum ratingsLow on resistance: 62 Ω typical±1 nA maximum path current leakage @ +25°CLow RON match (5 Ω maximum)Low power dissipation 0.8 μW typicalLatch-up proof construction

ADG467BR-REEL7 GENERAL DESCRIPTION

The ADG467 is an octal channel protector. The channelprotector is placed in series with the signal path. The channelprotector protects sensitive components from voltage transiencein the signal path regardless if the power supplies are present ornot. For this reason, the channel protectors are ideal for use inapplications where correct power sequencing cannot always beguaranteed (for example, hot insertion rack systems) to protectanalog inputs. This is described further, and some examplecircuits are given in the Applications Information section.Each channel protector has an independent operation and con-sists of an N-channel MOSFET, a P-channel MOSFET, and anN-channel MOSFET, connected in series. The channel protectorbehaves just like a series resistor during normal operation, thatis, (VSS + 1.5 V) < VIN < (VDD − 1.5 V). When a channel’s analoginput exceeds the power supplies (including VDD and VSS = 0 V),one of the MOSFETs switches off, clamping the output to eitherVSS + 1.5 V or VDD − 1.5 V. Circuitry and signal source protec-tion is provided in the event of an overvoltage or power loss.The channel protectors can withstand overvoltage inputs from−40 V to +40 V. See the Circuit Information section.The ADG467 can operate off both bipolar and unipolarsupplies. The channels are normally on when power isconnected and open circuit when power is disconnected. Withpower supplies of ±15 V, the on resistance of the ADG467 is62 Ω typical with a leakage current of ±1 nA maximum. Whenpower is disconnected, the input leakage current is approx-imately ±0.5 nA typical.The ADG467 is available in an 18-lead SOIC package and a20-lead SSOP package.

ADG467BR-REEL7 APPLICATIONS

ATE equipmentSensitive measurement equipmentHot insertion rack systems