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

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Applicaton Notes for Microwave Attenuators

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

model 3250A attenuator block diagram

model 3250A attenuator RF schematic diagram

 

  • 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 "O" (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

 

Model 3250A maximum peak and average operating power without performance degration Model 3250A attenuator survival power derating factor

 

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 connector
5002* 8-Bit Resolution 1 µsec switching time
 G09 Guaranteed yo meet Environmental Ratings
G12 RoHS Compliant
G16 RoHS Plus 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 AND WEIGHT
model 3250A attenuator dimensions and weight diagram