ADG467 Datasheet PDF - Analog Devices
| Part Number | ADG467 | |
| Description | Triple and Octal Channel Protectors | |
| Manufacturers | Analog Devices | |
| Logo |  |
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a
Triple and Octal
Channel Protectors
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
ADG466/ADG467 60 ⍀ typ
1 nA Max Path Current Leakage @ +25؇C
Low RON Match (5 ⍀ max)
Low Power Dissipation 0.8 W typ
Latch-Up Proof Construction
APPLICATIONS
ATE Equipment
Sensitive Measurement Equipment
Hot-Insertion Rack Systems
ADG466/ADG467
FUNCTIONAL BLOCK DIAGRAMS
VDD VSS
VD1 VS1
VD2 VS2
VD3
ADG466
VS3
VDD VSS
VD1 VS1
VD2 VS2
VD3 VS3
VIN
VIN
VDD
VD8 VS8
VOUT
ADG467
VOUT
VDD
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., (VSS + 2 V) < VIN < (VDD – 1.5 V). When a channel’s ana-
log 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 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
OUTPUT CLAMPED
@ VDD – 1.5V
ADG467 is 60 Ω typ with a leakage current of ± 1 nA max.
When power is disconnected, the input leakage current is ap-
proximately ±5 nA typ.
The ADG466 is available in 8-lead DIP, SOIC and µSOIC
packages. The ADG467 is available in an 18-lead SOIC package
and a 20-lead SSOP package.
PRODUCT HIGHLIGHTS
1. Fault Protection.
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.
2. Low Power Dissipation.
3. Low RON.
ADG466/ADG467 60 Ω typ.
4. Trench Isolation Latch-Up Proof Construction.
A dielectric trench separates the p- and n-channel MOSFETs
thereby preventing latch-up.
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 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998
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ADG466/ADG467
–10
–12
–14
–16
–18
–20
–22
–24
–26
–28
–30
1M
10M
FREQUENCY – Hz
30M
Figure 7. Frequency Response (Magnitude) of the ADG467,
VDD/VSS = ±15 V and Input Signal Level of ±100 mV
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10k
100k
1M
FREQUENCY – Hz
10M
40M
Figure 10. Off Isolation of the ADG467, VDD/VSS = 0 V and
Input Signal Level of ±100 mV
105.359
82.859
60.359
37.859
15.359
–7.141
–29.641
–52.161
–76.641
–97.161
100 1k 10k 100k 1M 10M
FREQUENCY – Hz
Figure 8. Frequency Response (Phase) of the ADG467,
VDD/VSS = ±15 V and Input Signal Level of ±100 mV
TEK RUN: 5.00GS/s ET SAMPLE
11.8ns
1
12.2ns
2
CH1 2.00V CH2 2.00V M 10.0ns CH1
2.2V
Figure 11. Propagation Delay Through ADG467, VDD/VSS =
±15 V, Channel 1 Input and Channel 2 Output
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
10k
100k
1M
FREQUENCY – Hz
10M
40M
Figure 9. Crosstalk Between Adjacent Channels of the
ADG467, VDD/VSS = ±15 V and Input Signal Level of ±100 mV
–10
–14
–18
–22
–26
–30
–36
–38
–42
–46
–50
100k
1M
FREQUENCY – Hz
10M
40M
Figure 12. Frequency Response (Magnitude) of the ADG466,
VDD/VSS = ±15 V and Input Signal Level of ±100 mV
REV. A
–5–
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| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ ADG467.PDF Datasheet ] | |
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