ADG466 Analog Devices, ADG466 Datasheet

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ADG466

Manufacturer Part Number
ADG466
Description
Triple Channel Protector (Fault and Overvoltage Protection)
Manufacturer
Analog Devices
Datasheet

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a
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
SS
+ 2 V) < V
ON
SS
+ 2 V or V
Match (5
IN
DD
< (V
– 1.5 V. Circuitry and signal source
max)
DD
– 1.5 V). When a channel’s ana-
typ
ON
with Power On
40 V
DD
and V
SS
=
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
V
V
V
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.
V
D1
D2
D3
DD
V
ADG466
DD
V
IN
ON
V
SS
.
V
FUNCTIONAL BLOCK DIAGRAMS
IN
V
V
V
typ with a leakage current of 1 nA max.
S1
S2
S3
World Wide Web Site: http://www.analog.com
V
V
V
V
Channel Protectors
D8
D1
D2
D3
ADG466/ADG467
typ.
V
ADG467
OUTPUT CLAMPED
@ V
DD
Triple and Octal
DD
V
SS
– 1.5V
© Analog Devices, Inc., 1998
V
V
V
V
V
S1
S2
S3
S8
DD
V
OUT
V
OUT

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ADG466 Summary of contents

Page 1

... 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 the on-resistance of the ADG466 and REV. A Information furnished by Analog Devices is believed to be accurate and reliable ...

Page 2

... Power Off and Output S/C) POWER REQUIREMENTS NOTES 1 Temperature range is as follows: B Version: – + Guaranteed by design, not subject to production test. Specifications subject to change without notice. ADG466 ADG467 – 0 ...

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 ADG466/ADG467 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

... ADG466/ADG467–Typical Performance Characteristics ADG466 15V 13. 16.5V 30 –10 – – Volts D Figure 1. On Resistance as a Function of V (Input Voltage +15V –15V 125 –40 C ...

Page 5

... V, Channel 1 Input and Channel 2 Output –10 –14 –18 –22 –26 –30 –36 –38 –42 –46 –50 10M 40M 100k Figure 12. Frequency Response (Magnitude) of the ADG466 and Input Signal Level of 100 –5– ADG466/ADG467 100k 1M 10M FREQUENCY – TEK RUN: 5.00GS/s ET SAMPLE 11 ...

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 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 10k 100k 1M FREQUENCY – Hz Figure 14. Crosstalk Between Adjacent Channels of the ...

Page 7

... DD N CHANNEL EFFECTIVE SPACE CHARGE REGION (V – 13.5V – 1.5V T –7– ADG466/ADG467 where V is the threshold voltage of the PMOS de However, if the supplies are off, the fault current – (+13.5V) NMOS PMOS POSITIVE (+20V) NON- ...

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, the other MOS devices are nonsaturated. NEGATIVE OVERVOLTAGE (–20V) PMOS NMOS ...

Page 9

... Again this ensures that signals on the inputs of the CMOS de- vices never exceed the supplies. High Voltage Surge Suppression The ADG466 and ADG467 are not intended for use in high voltage applications like surge suppression. The ADG466 and ADG467 have breakdown voltages ...

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 (2.54) 0.014 (0.356) 0.045 (1.15) BSC 18-Lead Small Outline IC (R-18) 0.4625 (11.75) 0.4469 (11.35 PIN 1 0.1043 (2.65) 0.0926 (2.35) 0.0500 0.0192 (0.49) ...

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