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PDF UM9552 Data sheet ( Hoja de datos )
| Número de pieza | UM9552 | |
| Descripción | PIN DIODE ATTENUATOR | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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580 Pleasant St.
Watertown, MA 02472
PH: (617) 926-0404
FAX: (617) 924-1235
Features
• Low Frequency Attenuator
• HF/LF Band Operation
• Long Lifetime (70 µs typ.)
• Very Low Distortion (IP3 @ 455 KHz = < 60 dBm)
UM9552
PIN DIODE
ATTENUATOR
Description
The UM9552 is a very long minority carrier
lifetime (70 µs typical) PIN DIODE that has been
developed for low HF or LF Band Attenuator
Applications. They have been evaluated for attenuator
linearity and distortion characteristics in a Bridge Tee
Attenuator Circuit at 455 KHz (the common intermediate
frequency for AM transmitters and receivers). When the
UM9552’s are used as the two variable resistors in the
Bridged Tee Circuit, the Third Order Intermodulation
Products are below -60 dBc with 0 dBm input power
over an attenuation range of 4 dB to 30 dB.
These thicker, longer lifetime PIN diodes exhibit
a more linear forward biased resistance (RS) vs forward
bias current (If) relationship, which greatly simplifies the
design of the driver circuits that supply the bias
currents over the specified attenuation range. This task
is simplified if the low attenuation range is truncated
and the few dB are compensated by commercially
available, inexpensive 4 to 6 dB gain blocks.
TYPICAL POWER LEVEL vs FORWARD BIAS CURRENT
40
f1 = F +/- 1 KHz
f2 = F +/- 1 KHz
35
70
65
500KHz 250KHz 150KHz
30 60
25 55
20 50
TAU = 0.1 ms
15
1
2 3 4 5 6 78
If NEEDED TO OBTAIN AN IM3 OF - 60 dBc (mA)
45
10
Electrical Specifications (25°C)
Test
Min.
Diode Resistance RS
Capacitance CT
Reverse Current IR
Carrier Lifetime τ
IP3
50
50
Thermal Resistance
Typ.
18.0
2.0
.25
15
70
60
Max.
0.4
20
10
1.0
Units
Ω
Ω
Ω
pF
µA
µs
dBm
°C / W
Conditions
F = 455 KHz, If = 1 mA
F = 455 KHz, If =10 mA
F = 455 KHz, If = 100 mA
F = 1 MHz, 100 V
VR = 50 V
If =10 mA / 100 V
Power in = 0 dBm / Tone
F1 = 454 KHz F2 = 456 KHz
Circuit Drawing #B14433
25°C Stud Temperature
MSCO867B 11-30-98
DSW UM9552 <B>(34943)
1 page | ||
| Páginas | Total 4 Páginas | |
| PDF Descargar | [ Datasheet UM9552.PDF ] | |
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