UM9552 MICROSEMI | Alldatasheet
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Technical content
MSCO867B 11-30-98 DSW UM9552 <B>(34943) UM9552 FeaturesFeatures
- Low Frequency Attenuator
- HF/LF Band Operation
- Long Lifetime (70 µµs typ.)
- Very Low Distortion (IP3 @ 455 KHz = < 60 dBm)
Description
Electrical Specifications (25°C) Test Min. Typ. Max. Units Conditions Diode Resistance RS 18.0 ΩΩ F = 455 KHz, If = 1 mA 2.0 ΩΩ F = 455 KHz, If =10 mA .25 0.4 ΩΩ F = 455 KHz, If = 100 mA Capacitance CT 15 20 pF F = 1 MHz, 100 V Reverse Current IR 10 µµA VR = 50 V Carrier Lifetime ττ 50 70 µµs If =10 mA / 100 V IP3 50 60 dBm Power in = 0 dBm / Tone F1 = 454 KHz F2 = 456 KHz Circuit Drawing #B14433 Thermal Resistance 1.0 °°C / W 25°°C Stud Temperature 1 102 3 4 5 6 7 8 If NEEDED TO OBTAIN AN IM3 OF - 60 dBc (mA) POWER LEVEL/TONE (dBm) IP3 (dBm) TYPICAL POWER LEVEL vs FORWARD BIAS CURRENT 500KHz 250KHz 150KHz TAU = 0.1 ms f1 = F +/- 1 KHz f2 = F +/- 1 KHz 580 Pleasant St. Watertown, MA 02472 PH: (617) 926-0404 FAX: (617) 924-1235 PIN DIODE ATTENUATOR The UM9552 is a very long minority carrier lifetime (70 µµs 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 (R S) 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.
MSCO867B 11-30-98 DSW UM9552 <B>(34943) UM9552 -310 -210 -110 010 110 If [AMPERES] -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 TCVf [mV/oC] TYPICAL TCVf vs If 125 oC DELTA .01 .1 1 10 100 If (mA) 100 1000Rs (Ohms) TYPICAL RS vs FORWARD BIAS CURRENT Vf [VOLTS] -610 -510 -410 -310 -210 -110 010 110 210 If [AMPERES] TYPICAL I-V CURVE 150 oC 125 oC 100 oC 75 oC 50 oC 25 oC
MSCO867B 11-30-98 DSW UM9552 <B>(34943) UM9552 UM9552
MSCO867B 11-30-98 DSW UM9552 <B>(34943) UM9552 UM9552S