Kratos Microwave Electronics Division (KMED)

Model 3250B Ultra-Broadband 6-Bit Digital PIN Diode Attenuator

Application Notes for Microwave Attenuators

The Model 3250B digitally programmable attenuator provides excellent performance characteristics over the frequency range of 0.2 to 18 GHz. Attenuation levels up to 60 dB are programmable in increments of 1 dB.

The unit is an integrated assembly of a dual T-pad PIN diode attenuator and a driver consisting of a D/A and an I/V Converter. See figures 1 and 2.

The Model 3250B operates as a bilaterally-matched device at all attenuation levels. It is supplied in a compact rugged package.

 

PERFORMANCE CHARACTERISTICS

Frequency Range........................ 0.2 to 18 GHz Mean Attenuation Range     0.2 to 18 GHz.......................... 60 dB Insertion Loss (max.)     0.2 to 8 GHz............................ 3.5 dB     >8 to 12.4 GHz........................ 4.0 dB     >12.4 to 18 GHz...................... 5.0 dB VSWR (max.)     0.2 to 8 GHz........................... 1.75     >8 to 18 GHz.......................... 2.0 Accuracy of Attenuation     0 to 30 dB.............................. ± 0.5 dB     >30 to 50 dB.......................... ± 0.75 dB     >50 to 60 dB.......................... ± 1.5 dB Flatness of Attenuation     0 to 30 dB.............................. ±1.0 dB     >30 to 40 dB........................... ±1.5 dB    >40 to 50 dB............................ ±2.0 dB    >50 to 60 dB............................ ±3.0 dB Temperature Coefficient ............. 0.02 dB/°C max

Power Handling Capability     Without Performance Degradation.......   Up to 50 mW cw or peak (see Figure 3)     Survival Power..................................... 2W average or peak       (from -54°C to +25°C; see Figure 4 for higher temperatures) Switching Time....................................... 2 µsec max. Programming.......................................... Positive true binary standard or BCD (Option 1). For complementary code, specify Option 2. Minimum Attenuation Step...................... 1.0 dB Logic Input     Logic "0" (Bit Off)................................. -0.3 to +0.8 V@500 µA max     Logic "1" (Bit On).................................. +2.0 to +5.0 V@100 µA max Power Supply     Requirements....................................... +5V ±5%, 250 mA +15V ± 5%, 75 mA - 15V, ± 5%, 75 mA

  

 

OPTION (G09) ENVIRONMENTAL RATINGS Operating Temperature Range.......................... -54°C to 110°C Non-Operating Temperature Range.................. -65°C to +125°C Humidity.......................................................... MIL-STD-202F, Method 103B, Cond. B (96 hrs. at 95%) Shock.............................................................. MIL-STD-202F, Method 213B, Cond. B (75G, 6 msec) Vibration......................................................... MIL-STD-202F, Method 204D, Cond. B (.06" double amplitude or 15G, whichever is less) Altitude........................................................... MIL-STD-202F, Method 105C, Cond. B (50,000 ft.) Temp. Cycling................................................. MIL-STD-202F, Method 107D, Cond. A, 5 cycles                                                          AVAILABLE OPTIONS Option No. Description 1 BDC programming (Binary is standard) 2 Complementary programming (positive true is standard) 7 Two SMA male RF connectors 10 One SMA male (J1) and one SMA female (J2) RF connectors 5002* 8-Bit Resolution 1 µsec switching time  G09 Guaranteed to meet Environmental Ratings G12 RoHS Compliant G18 REACH Compliant *Special order product. Consult factory before ordering. In addition, consult  factory for impact on specifications; i.e., VSWR and Insertion loss and availability.

PIN FUNCTIONS PIN NO. BINARY BCD (Opt. 1) 1 SPARE SPARE 2 SPARE SPARE 3 +5V +5V 4 Digital & POWER GND Digital & POWER GND 5 GND 1 dB 6 GND 2 dB 7 1 dB 4 dB 8 2 dB 8 dB 9 4 dB 10 dB 10 8 dB 20 dB 11 16 dB 40 dB 12 32 dB OPEN (NO CONNECTION)  13 + 15V + 15V 14 - 15V - 15V 15 SPARE SPARE                                            ACCESSORY FURNISHED                      Mating power/logic connector

                                                                                        

Dimensions in  mm (Inches) Tolerances, unless otherwise indicated: .XX ±.02; .XXX ±.005

The information contained in this data sheet is basic marketing information and does not contain any export controlled information.