Kratos Microwave Electronics Division (KMED)

Microwave Attenuator Series 348 and 348H

Application Notes for Microwave Attenuators

              

PERFORMANCE CHARACTERISTICS

MODEL	FREQUENCY RANGE (GHz)	MAX. INSERTION LOSS (dB)	MAX. VSWR	FLATNESS (± dB) AT MEAN ATTENUATION LEVELS UP TO
				10 dB	20 dB	40 dB	60 dB
3482/H*	2.0 - 4.0	1.8	1.5	0.5	1.0	1.5	1.6
	1.5 - 4.5(1)	1.9	2.0	0.7	1.6	3.0	3.5
3483*/H*	2.6 - 5.2	2.0	1.6	0.5	1.0	1.5	1.6
	1.95 - 5.85(1)	2.1	2.1	0.7	1.6	3.0	3.5
3484/H	4.0 - 8.0	2.4	1.7	0.5	1.0	1.5	1.6
	3.0 - 9.0(1)	2.5	2.2	0.7	1.6	3.0	3.5
3486/H	6.0 - 12.0	2.7	1.8	0.7	1.0	1.5	1.6
	4.5 - 13.5(1)	2.8	2.2	0.9	1.6	3.0	3.5
3488/H	8.0 - 18.0	3.0(2)	1.8(3)	0.7	1.0	1.5	1.6
	6.0 - 18.0(1)	3.0(2)	1.8(3)	0.9	1.6	3.0	3.5

* Special-order product. Consult factory before ordering. 
(1) Specifications for the extended frequency ranges are typical.
(2) For 3488, 4.0 dB from 16-18 GHz. For 3488H, 3.5 dB from 12-16 GHz and 4.0 dB from 16-18 GHz.
(3) VSWR is 2.0 from 16-18 GHz.

Mean Attenuation Range.......................... 60 dB Accuracy of Attenuation    0 to 30dB.............................................. ± 0.5 dB    > 30 to 50 dB......................................... ± 1.0 dB    > 50 to 60 dB......................................... ± 1.5 dB Monotonicity............................................ Guaranteed Phase Shift............................................... See Application Notes Temperature Coefficient............................ ± 0.02 dB/°C Power Handling Capability     Without Performance Degradation.......... (348) 100 mW cw or peak (348H) 10 mW cw or peak Survival Power    (from -55°C to +25°C; see Figure 3 for    Higher Temperatures)............................. 1W average, 25W peak Switching Time......................................... (348) 500 nsec max (348H) 200 nsec max Programming: 8 Bit TTL............................ Positive True binary Minimum Attenuation Step....................... 0.25 dB Logic Input    Logic "0"................................................. -0.3 to +0.8V    Logic "1"................................................. +2.0 to +5.0V    Logic Input Current................................ 10 µA max Analog Input Characteristics    Range..................................................... 0 to 6V    Transfer Function.................................... 10 dB/V    Input Resistance...................................... 6 kohms Power Supply Requirements....................... +12 to +15V, 120mA   -12 to -15V, 50 mA

OPTION (G09) ENVIRONMENTAL RATINGS Operating Temperature Range................ -54°C to +110°C Non-Operating Temperature Range........ -65°C to +125°C ACCESSORY FURNISHED Mating power/logic connector AVAILABLE OPTIONS                         Option No. Description 7 Two SMA male RF connectors 10 One SMA male (J1) and one SMA female (J2) RF connector 49 High Rel screening (see Table 1 below for further information)  G09 Guaranteed to meet Environmental Ratings  G12 RoHS Compliant G18 REACH Compliant   Table 1. Option 49 High Rel Screening - MIL - STD 883 TEST METHOD CONDITION Internal Visual 2017 — Temperature Cycle 1010 A Mechanical Shock 2002 B Burn-In 1015 — Leak 1014 A1

                                                  DIMENSIONS AND WEIGHT

                                                                      SERIES 348/H
                                                             wt: 2.4 oz. (68 gr) approx.

Dimensions are stated in inches (mm).  Tolerances, unless otherwise indicated: .XX ±.02; .XXX ±.008

J3 POWER/LOGIC CONNECTIONS
PIN	FUNCTIONS (Note 1)
A	Digital/Power GND
B	Logic Control (Note 2)
C	–12 to –15V
D	0.25 dB (LSB)
E	0.5 dB
F	1 dB
H	4 dB
J	2 dB
K	16 dB
L	32 dB (MSB)
M	+12 to +15V
N	8 dB
P	GND
R	Analog Input (Notes 3&4)

NOTES

(1) All unused logic inputs must be grounded.
(2) For normal TTL programming control, PIN B must be grounded or at Logic 0. Application of Logic 1 to PIN B overrides the digital input and sets the unit to insertion loss. To interface with other logic families (e.g., CMOS, MTL, NMOS, etc.) contact factory.
(3) If Analog input is not to be used, then connect PIN R to PIN P.
(4) To use the unit as a voltage controlled attenuator, apply a control voltage of 0 to +6V at PIN R. The slope of attenuation will be nominally 10 dB/V. For a non-zero source resistance (RO) of up to 500 ohms, the attenuation error is approximately –.0017 • RO • VIN dB and the slope will decrease by approximately 0.17 dB/V per 100 ohms of source resistance. Using the 348/H Series attenuator as both a digital and analog control attenuator, the total attenuation ATT = 10 • VIN + programmed digital attenuation. The maximum attainable mean attenuation is 60 dB.

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