Microwave Electronics Products

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.

  
  • Frequency range: 0.2 to 18 GHz
  • Attenuation range: Up to 60 dB
  • 6 Bit Binary or BCD programming
  • Absorptive
  • Guaranteed Monotonicity
Model 3250A ultra-broadband 6-bit digital pin diode attenuator 

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
*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

                                                                                        
 


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