Model 3499 Octave-Band 11 Bit Digital PIN Diode Attenuator

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 Application Notes for Microwave Attenuator

The Digitally Controlled Model 3499 Millimeter Wave Attenuator provides greater than octave-band performance and wide programming flexibility in a compact rugged package.

The Model 3499 is an integrated assembly of a balanced PIN diode attenuator and a driver circuit consisting of a PROM, a D/A converter and a current-to-voltage converter, as shown in Figure 1. This arrangement provides a high degree of accuracy and repeatability and also preserves the inherent monotonicity of the attenuator.

The Model 3499 offers a 50 dB attenuation range, 0.03 dB resolution and switching speed of no more than 500 nanoseconds. It is available with either a strobe/latch or a non-linear current or voltage controlled attenuation capability.

Model 3499 Attenuator block diagram

 

  • Frequency range: 18-40 GHz
  • 50 dB attenuation range
  • 500 nsecond switching speed
  • 11 Bit binary programming
  • Guaranteed monotonicity
  • Absorptive

 

Programmable RF Attenuator | Octave Band 11 Bit Digital Attenuator Model 3499

 


PERFORMANCE CHARACTERISTICS
MODEL FREOUENCY RANGE (GHz) MAX INSERTION LOSS (dB) MAX VSWR FLATNESS (± dB) AT MEAN ATTENUATION LEVELS UP TO
10dB 20dB 40dB 50dB 60dB
3499 18 - 26.5 4.1 2.2 1.3 2.2 3.4 4.0 N/A
>26.5 - 36 4.6
>36 - 40 5.2
3499-60 18 - 26.5 4.3 2.2 1.3 2.2 3.4 4.0 5.0
>26.5 - 36 4.9
>36 - 40 5.8

 

Mean Attenuation Range.................
   Model 3499 50 dB
   Model 3499-60 60 dB
Accuracy of Attenuation
    0-30 dB................................ ±0.5 dB
    30-50 dB.............................. ±1.0 dB
    30-60 dB (Model 3499-60) ±1.0 dB
Monotonicity............................. Guaranteed
Temperature
    Coefficient
.............................

±0.03 dB/°C
Power Handling Capability
    Without Performance
        Degradation......................

10 mW cw or peak
    Survival Power (from –40°C to
    +25°C; see Figure 2 for higher
      temperatures)......................

 0.2W average, 5W peak (1 µsec max pulse width)
Switching Time...................... 0.5 µsec max.
Programming......................... Positive true binary. For complementary code, specify Option 2. To interface with other logic families, please contact factory.
Minimum Attenuation Step.......... 0.03 dB
Logic Input
     Logic "O" (Bit Off)....................
     Logic "l " (Bit On)....................
     Logic Input Current ................

0.3 to +O.8V
+2.0 to +5.OV
1 µA max
Analog Input............................. 0 to 6.4V
Power Supply Requirements....... 12V to + 15V, 120 mA
-12V to -15V, 50 mA
Power Supply Rejection............. Less than 0.1 dB/volt change in either supply
ENVIRONMENTAL RATINGS
 Operating Temperature
     Range........................... -40°C to +85°C
Non-Operating Temperature
    Range............................ -54°C to +100°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


millimeter wave attenuator power derating factor

 

DIMENSION AND WEIGHT
Millimeter wave Attenuator dimensions | PIN Diode Attenuator Dimensions
J3 PIN FUNCTIONS
PIN NO. BINARY
1   0.06 dB(1)
2   0.13 dB
3   Analog Input/
  Strobe Latch(2)(3)
4   GND
5   0.25 dB
6   0.5 dB
7   1 dB
8   2 dB
9   4 dB
10   8 dB
11   16 dB
12   32 dB
13   +12 to +15V
14 –12 to –15V
15   0.03 dB

 

ACCESSORY FURNISHED
Mating power/logic connector

AVAILABLE OPTIONS
Option No. Description
2 Complementary programming (logic "0" is Bit On)
4 Strobe latch for data input. Attenuator responds to data input when logic "0" is applied. Attenuator latched to data input when logic "1" is applied.
7 Two type K male RF connectors
10 One type K male (J1) and one type K female (J2) RF connector
NOTES:
  1. The Model 3499 attenuator is an 11-bit digital attenuator. In order to use this device with a lesser number of bits (lower resolution), the user may simply ground the logic pins for the lowest order unused bits. For example, when operated as an 8-bit unit, the Model 3499 would have Pin 15, Pin 1 and Pin 2 connected to ground. All other parameters remain unchanged.
  2. Normally supplied as an Analog input. Optionally available as a strobe latch function for input data.
  3. Pin 3 is available to apply a current or voltage to control the attenuator in a non-linear fashion. leave pin as open circuit if not used.