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ADG467BRSZ

Octal Channel Protectors

Analog Devices 

FEATURES

Fault and overvoltage protection up to ±40 V

Signal paths open circuit with power off

Signal path resistance of RON with power on

44 V supply maximum ratings

Low on resistance: 62 Ω typical

±1 nA maximum path current leakage @ +25°C

Low RON match (5 Ω maximum)

Low power dissipation 0.8 μW typical

Latch-up proof construction

APPLICATIONS

ATE equipment

Sensitive measurement equipment

Hot insertion rack systems

GENERAL DESCRIPTION

The ADG467 is an octal channel protector. The channel

protector is placed in series with the signal path. The channel

protector protects sensitive components from voltage transience

in the signal path regardless if the power supplies are present or

not. For this reason, the channel protectors are ideal for use in

applications where correct power sequencing cannot always be

guaranteed (for example, hot insertion rack systems) to protect

analog inputs. This is described further, and some example

circuits 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 an

N-channel MOSFET, connected in series. The channel protector

behaves just like a series resistor during normal operation, that

is, (VSS + 1.5 V) < VIN < (VDD − 1.5 V). When a channel’s analog

input exceeds the power supplies (including VDD and VSS = 0 V),

one of the MOSFETs switches off, clamping the output to either

VSS + 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 unipolar

supplies. The channels are normally on when power is

Octal Channel Protectors

ADG467

FUNCTIONAL BLOCK DIAGRAM

VDD VSS

VD1

VS1

VD2

VS2

VD3

VS3

VIN

VIN

VD8

VS8

VOUT

ADG467

VOUT

VDD

VDD

OUTPUT CLAMPED

AT VDD – 1.5V

Figure 1.

connected and open circuit when power is disconnected. With

power supplies of ±15 V, the on resistance of the ADG467 is

62 Ω typical with a leakage current of ±1 nA maximum. When

power is disconnected, the input leakage current is approx-

imately ±0.5 nA typical.

The ADG467 is available in an 18-lead SOIC package and a

20-lead SSOP package.

PRODUCT HIGHLIGHTS

1. Fault Protection.

The ADG467 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 ADG467, the output is clamped.

When power is turned off, current is limited to the

microampere level.

2. Low Power Dissipation.

3. Low RON. 62 Ω typical.

4. Trench Isolation Latch-Up Proof Construction.

A dielectric trench separates the p- and n-channel

MOSFETs thereby preventing latch-up.

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

©2011 Analog Devices, Inc. All rights reserved.

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