Kratos Microwave Electronics Division (KMED)

Model 3499 Octave-Band 11 Bit Digital PIN Diode Attenuator

Application Notes for Microwave Attenuators

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 attenuation range of 50dB and 60 dB repectively, 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.

 

PERFORMANCE CHARACTERISTICS

MODEL	FREQUENCY 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 "0" (Bit Off)...............................      Logic "1" (Bit On)...............................      Logic Input Current ........................... -0.3 to +0.8V +2.0 to +5.0V 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 OPTION G09 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 ACCESSORY FURNISHED Mating power/logic connector

DIMENSIONS AND WEIGHT

	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
Weight: 5 oz. (142 gr) approx. Dimensions are stated in inches (mm).  Tolerances, unless otherwise indicated: .XX ±.02; .XXX ±.008

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 G09  Meeting environmental conditions G10  Glitch free driver. Recommended option. See Application Notes for Microwave Attenuators for more information  G12  RoHS compliant G16  RoHS & REACH compliant   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.

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