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參數(shù)資料
| 型號(hào)： | UMX9989AP |
| 廠商： | Microsemi Corporation |
| 英文描述： | DUAL ULTRA LOW MAGNETIC MOMENT FAST DIODES FOR MRI APPLICATIONS |
| 中文描述： | 雙超低磁力矩快速二極管成像應(yīng)用 |
| 文件頁數(shù)： | 1/5頁 |
| 文件大小： | 323K |
| 代理商： | UMX9989AP |
Microsemi
Page 1
Copyright
2005
Rev. 0, 2005-09-08
W
M
.
C
UMX9989AP
DUAL ULTRA LOW MAGNETIC MOMENT
FAST DIODES FOR MRI APPLICATIONS
RoHS compliant
DESCRIPTION
The UMX9989AP is the first MRI
switching diode module, designed to
optimize performance and reduce
assembly labor, cost, and polarity
errors.
There are two principle applications for
which the UMX9989AP modules are
intended:
1) MRI receiver protection from high
RF energy fields, including long RF
pulses and RF spike pulses present in
most MRI machines. The UMX9989AP
acts as a passive protector (limiter) for
the MRI receiver’s LNA.
The diode assembly exhibits extremely
low insertion loss, both in the “on” state
(high power present) and the “off” state
(receiver power present) so the
Receiver’s Noise Figure is not
increased by the protector circuit.
2) Passive switching of surface coil
detuning and blocking circuits. In this case,
the flow of loop current during transmitter
pulse turns on the diodes, without a switch
driver.
If the UMX9989AP is combined with a PIN
diode (UM7201SM) the combination can
be used to implement a semi-active detune
or block circuit design. The UMX9989AP’s
turn on the PIN diode (used for higher
power switching) during the sinc(x)
sidelobes, before the main pulse of the
transmitter waveform, sinc(x) = [sin (x)]/x,
occurs. The mechanical drawing shows the
structure of the diode pair. Manufacture of
dual anti-parallel pairs of UMX9989’s
ensures that the matched pair of diodes can
be inserted in a coil with the correct diode
polarities and with the minimum parasitic
inductance and capacitance, thermal
impedance and labor for the coil
manufacturer.
IMPORTANT:
For the most current data, consult
MICROSEMI
’s website:
http://www.microsemi.com
ABSOLUTE MAXIMUM RATINGS AT 25o C
(UNLESS OTHERWISE SPECIFIED)
Rating
Symbol
Value
Unit
Non-Repetitive Peak Forward Surge Current
8.3ms Single half sine wave
Storage Temperature
Operating Temperature
I
FSM
2
A
T stg
T op
-65 to +150
-65 to +150
oC
oC
KEY FEATURES
Ultra low magnetic construction
RoHS compliant
Matched pairs available
Surface mount package.
Metallurgical bond
Planar passivated chip
Non cavity design
Thermally matched configuration
Low capacitance at 0 V bias
Low conductance at 0 V bias
Compatible with automatic
insertion equipment
APPLICATIONS/BENEFITS
MR passive receiver protection
MR passive blocking circuits
MR passive detuning circuits
MR passive disable circuits
U
M
X
9
9
8
9
A
P
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