adg466brm Analog Devices, Inc., adg466brm Datasheet

adg466brm

Manufacturer Part Number

adg466brm

Description

Triple And Octal Channel Protectors

Manufacturer

Analog Devices, Inc.

Datasheet

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GENERAL DESCRIPTION

The ADG466 and ADG467 are triple and octal channel pro-

tectors, respectively. The channel protector is placed in series

with the signal path. The channel protector will protect sensitive

components from voltage transience in the signal path whether

the power supplies are present or not. Because the channel

protection works whether the supplies are present or not, the

channel protectors are ideal for use in applications where

correct power sequencing can’t always be guaranteed (e.g., hot-

insertion rack systems) to protect analog inputs. This is dis-

cussed further, and some example circuits are given in the

Applications section of this data sheet.

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 protec-

tor behaves just like a series resistor during normal operation,

i.e., (V

log input exceeds the power supplies (including V

REV. A

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

0 V), one of the MOSFETs will switch off, clamping the output

to either V

protection 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 of

this data sheet.

The ADG466 and ADG467 can operate off both bipolar and

unipolar supplies. The channels are normally on when power is

connected and open circuit when power is disconnected. With

power supplies of 15 V, the on-resistance of the ADG466 and

FEATURES

Fault and Overvoltage Protection up to

44 V Supply Maximum Ratings

Low On Resistance

1 nA Max Path Current Leakage @ +25 C

Low R

Low Power Dissipation 0.8 W typ

Latch-Up Proof Construction

APPLICATIONS

ATE Equipment

Sensitive Measurement Equipment

Hot-Insertion Rack Systems

Signal Paths Open Circuit with Power Off

Signal Path Resistance of R

ADG466/ADG467 60

+ 2 V) < V

+ 2 V or V

Match (5

< (V

– 1.5 V. Circuitry and signal source

max)

– 1.5 V). When a channel’s ana-

typ

with Power On

40 V

and V

ADG467 is 60

When power is disconnected, the input leakage current is ap-

proximately 5 nA typ.

The ADG466 is available in 8-lead DIP, SOIC and SOIC

packages. The ADG467 is available in an 18-lead SOIC package

and a 20-lead SSOP package.

PRODUCT HIGHLIGHTS

1. Fault Protection.

2. Low Power Dissipation.

3. Low R

4. Trench Isolation Latch-Up Proof Construction.

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

Tel: 781/329-4700

Fax: 781/326-8703

The ADG466 and ADG467 can withstand continuous volt-

age 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 ADG466 and ADG467, the output is

clamped. When power is turned off, current is limited to the

microampere level.

ADG466/ADG467 60

A dielectric trench separates the p- and n-channel MOSFETs

thereby preventing latch-up.

ADG466

FUNCTIONAL BLOCK DIAGRAMS

typ with a leakage current of 1 nA max.

World Wide Web Site: http://www.analog.com

Channel Protectors

ADG466/ADG467

typ.

ADG467

OUTPUT CLAMPED

@ V

Triple and Octal

– 1.5V

OUT

Related parts for adg466brm

adg466brm Summary of contents

Page 1

... ADG466 ADG467 V DD OUTPUT CLAMPED @ V – 1.5V DD typ with a leakage current max typ. World Wide Web Site: http://www.analog.com © Analog Devices, Inc., 1998 V OUT V OUT ...

Page 2

ADG466/ADG467–SPECIFICATIONS 1 Dual Supply ( –15 V, GND = 0 V, unless otherwise noted Parameter FAULT PROTECTED CHANNEL 2 Fault-Free Analog Signal Range Match ON LEAKAGE CURRENTS Channel ...

... Overvoltages will be clamped by the channel protector, see Circuit Information section of the data sheet. Model Temperature Range ADG466BN – +85 C ADG466BR – +85 C ADG466BRM – +85 C ADG467BR – +85 C ADG467BRS – +85 C CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection ...

Page 4

ADG466/ADG467–Typical Performance Characteristics ADG466 15V 13. 16.5V 30 –10 – ...

Page 5

FREQUENCY – Hz Figure 7. Frequency Response (Magnitude) of the ADG467 and Input Signal Level of 100 105.359 82.859 60.359 ...

Page 6

ADG466/ADG467 105.3 82.8 60.3 37.8 15.3 –7.1 –29.6 –52.1 –76.6 –92.1 100 1k 10k 100k FREQUENCY – Hz Figure 13. Frequency Response (Phase) of the ADG466 and Input Signal Level of 100 ...

Page 7

CIRCUIT INFORMATION Figure 17 below shows a simplified schematic of a channel protector circuit. The circuit is made up of four MOS transis- tors—two NMOS and two PMOS. One of the PMOS devices does not lie directly in the signal ...

Page 8

ADG466/ADG467 When a negative overvoltage is applied to the channel protector circuit, the PMOS transistor enters a saturated mode of opera- tion as the drain voltage exceeds V – low the case of the positive overvoltage, ...

Page 9

APPLICATIONS INFORMATION Overvoltage and Power Supply Sequencing Protection The ADG466 and ADG467 are ideal for use in applications where input overvoltage protection is required and correct power supply sequencing cannot always be guaranteed. The overvoltage protection ensures that the output ...

Page 10

ADG466/ADG467 8-Lead Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.060 (1.52) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 (3.30) 0.160 (4.06) MIN 0.115 (2.93) SEATING 0.022 (0.558) 0.100 0.070 (1.77) PLANE ...

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