adg465 Analog Devices, Inc., adg465 Datasheet

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adg465

Manufacturer Part Number
adg465
Description
Single Channel Protector In An Sot-23 Package
Manufacturer
Analog Devices, Inc.
Datasheet

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a
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.
GENERAL DESCRIPTION
The ADG465 is a single channel protector in an SOT-23 pack-
age. The channel protector is placed in series with the signal
path, and will protect sensitive components from voltage tran-
sience in the signal path whether or not the power supplies are
present. Because the channel protection works regardless of the
presence of the supplies, the channel protectors are ideal for use
in applications where correct power sequencing cannot always
be guaranteed to protect analog inputs (e.g., hot-insertion rack
systems). This is discussed further, and some example circuits
are given, in the Applications section of this data sheet.
A channel protector consists of an n-channel MOSFET, a
p-channel MOSFET and an n-channel MOSFET, connected in
series. The channel protector behaves like a series resistor dur-
ing normal operation, i.e., (V
When a channel’s analog input exceeds the power supplies
(including V
switch off, clamping the output to either V
Circuitry and signal source protection is provided in the event of
an overvoltage or power loss. The channel protectors can with-
stand overvoltage inputs from –40 V to +40 V. See the Circuit
Information section of this data sheet.
The ADG465 can operate from both bipolar and unipolar
supplies. The channels are normally on when power is con-
nected, and open circuit when power is disconnected. With
power supplies of 15 V, the on-resistance of the ADG465 is
80
is disconnected, the input leakage current is approximately
The ADG465 is available in a 6-lead plastic surface mount
SOT-23 package, and an 8-lead SOIC package.
5 nA typ.
FEATURES
Fault and Overvoltage Protection up to
44 V Supply Maximum Ratings
Low On Resistance 80
1 nA Max Path Current Leakage @ +25 C
Low Power Dissipation 0.8 W Typ
Latchup-Proof Construction
APPLICATIONS
ATE Equipment
Sensitive Measurement Equipment
Hot-Insertion Rack Systems
ADC Input Channel Protection
typ, with a leakage current of 1 nA max. When power
Signal Paths Open Circuit with Power Off
Signal Path Resistance of R
DD
and V
SS
= 0 V), one of the MOSFETs will
SS
+ 2 V) < V
Typ
ON
with Power On
IN
SS
< (V
+ 2 V or V
DD
40 V
– 1.5 V).
DD
– 1.5 V.
PRODUCT HIGHLIGHTS
1. Fault Protection.
2. Low Power Dissipation.
3. Low R
4. Trench Isolation Latchup-Proof Construction.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
V
The ADG465 can withstand continuous voltage inputs from
–40 V to +40 V. When a fault occurs due to the power sup-
plies 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.
A dielectric trench separates the p- and n-channel MOSFETs
thereby preventing latchup.
DD
V
IN
ON
V
80
Single Channel Protector
FUNCTIONAL BLOCK DIAGRAM
IN
typ.
in an SOT-23 Package
World Wide Web Site: http://www.analog.com
V
D1
V
ADG465
OUTPUT CLAMPED
@ V
DD
DD
V
SS
– 1.5V
© Analog Devices, Inc., 1998
V
V
S1
DD
ADG465
V
OUT
V
OUT

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adg465 Summary of contents

Page 1

... The ADG465 can operate from both bipolar and unipolar supplies. The channels are normally on when power is con- nected, and open circuit when power is disconnected. With power supplies the on-resistance of the ADG465 is 80 typ, with a leakage current max. When power is disconnected, the input leakage current is approximately 5 nA typ ...

Page 2

... ADG465–SPECIFICATIONS 1 Dual Supply ( –15 V, GND = 0 V, unless otherwise noted Parameter FAULT PROTECTED CHANNEL 2 Fault-Free Analog Signal Range LEAKAGE CURRENTS Channel Output Leakage, I S(ON) (Without Fault Condition) Channel Input Leakage, I D(ON) (With Fault Condition) Channel Input Leakage, I D(OFF) ...

Page 3

... 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. Although the ADG465 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... ADG465 —Typical Performance Characteristics 140 TEMP = +25 C 130 120 110 –5V 100 +10V –10V –10 – – Volts D S Figure 1. On Resistance as a Function of V (Input Voltage) 125 V = +15V DD 115 V = –15V SS 105 95 +125 C 85 ...

Page 5

... N EFFECTIVE SPACE CHARGE N-CHANNEL REGION (V – 13.5V) – 1.5V P –5– ADG465 where V is the threshold voltage of the PMOS and a positive overvoltage. The output will – V – – 1.5 V – However, if the supplies are off, the CLAMP L V – V ...

Page 6

... ADG465 When a negative overvoltage is applied to the channel protector circuit, the PMOS transistor enters a saturated mode of operation as the drain voltage exceeds V – See Figure 9 below the case of the positive overvoltage, the other MOS devices are nonsaturated. NEGATIVE OVERVOLTAGE (–20V) NEGATIVE ...

Page 7

... APPLICATIONS INFORMATION Overvoltage and Power Supply Sequencing Protection The ADG465 is ideal for use in applications where input over- voltage protection is required and correct power supply sequencing cannot always be guaranteed. The overvoltage protection en- sures that the output voltage of the channel protector will not exceed the threshold voltages set by the supplies (see Circuit Information section) when there is an overvoltage on the input ...

Page 8

... ADG465 0.071 (1.80) 0.059 (1.50) 0.051 (1.30) 0.035 (0.90) 0.006 (0.15) 0.002 (0.05) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 6-Lead Plastic Surface Mount SOT-23 Package (RT-6) 0.122 (3.10) 0.106 (2.70 0.118 (3.00) 0.098 (2.50 PIN 1 0.037 (0.95) BSC 0.075 (1.90) BSC 0.057 (1.45) 0.035 (0.90) 0.020 (0.50) 0.006 (0.15) SEATING 0.009 (0.23) 0.010 (0.25) PLANE 0.000 (0.00) 0.003 (0.08) 8-Lead SOIC (RM-8) 0 ...

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