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ADG465BRT-REEL

更新时间： 2024-11-23 13:05:27
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Single Channel Protector  
in an SOT-23 Package  
a
ADG465  
FUNCTIONAL BLOCK DIAGRAM  
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  
V
V
SS  
DD  
V
V
D1  
S1  
V
VIN  
OUT  
V
Low On Resistance 80 ⍀ Typ  
ADG465  
IN  
V
OUT  
1 nA Max Path Current Leakage @ +25؇C  
Low Power Dissipation 0.8 ␮W Typ  
Latchup-Proof Construction  
V
DD  
V
DD  
APPLICATIONS  
ATE Equipment  
OUTPUT CLAMPED  
@ V – 1.5V  
DD  
Sensitive Measurement Equipment  
Hot-Insertion Rack Systems  
ADC Input Channel Protection  
GENERAL DESCRIPTION  
PRODUCT HIGHLIGHTS  
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.  
1. Fault Protection.  
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.  
2. Low Power Dissipation.  
3. Low RON 80 Ω typ.  
4. Trench Isolation Latchup-Proof Construction.  
A dielectric trench separates the p- and n-channel MOSFETs  
thereby preventing latchup.  
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., (VSS + 2 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 will  
switch off, clamping the output to either VSS + 2 V or VDD – 1.5 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 Ω typ, with a leakage current of ±1 nA max. When power  
is disconnected, the input leakage current is approximately  
±5 nA typ.  
The ADG465 is available in a 6-lead plastic surface mount  
SOT-23 package, and an 8-lead µSOIC package.  
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.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1998  
12345678

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ADG465BRT-REEL 替代型号

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