defense electronics> microwave products > attenuators & modulators selection guide view printable version series d195 octave-band pin diode attenuator/modulators how to buy application notes *model 1950a is a special-order product. consult facto ry before ordering. (1) specifications for the extended frequency ranges are typical. (2) except from 16 - 18 ghz where insertion loss is 4.0 db max and vswr is 2.0 max. performance characteristics the series d195 voltage-controlled linearized atten uator/modulators are integrated assemblies consisting of a series 195 unit and a hy bridized driver circuit which provides a nominal transfer function of 10 db per v olt. (see figure 1 below.) all of the series d195 units except the d195oa* exh ibit fall times of 20 nsec max and rise times of 1.5 sec max for attenuation step s of 10 db or more. for smaller excursions, the fall times can increase to several hundred nsec, while the rise times remain essentially unchanged. in applications where a rapid return to insertion loss from any level of attenuation is req uired, option 59 is available. with this option, an external pulse is applied to trigge r a high-speed reset circuit, and recovery times of 200 nsec max are obtained. where use of an external reset pulse as described above is not feasible, an intern al reset option (option 58) is available which will automatically reset the unit t o insertion loss within 200 nsec for a step of 50 db or more. the fall and rise time spe cifications for the d1950a* are 500 nsec max and 10 sec max, respectively. options 58 and 59 are not available for this model. *model d1950a is a special-order product. consult facto ry before ordering. absorptive linearized frequency range: 0.5 to 18 ghz high performance mic quadrature hybrid design high speed all units in this series are equipped with integrated drivers 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 80 db d1950a* 0.5 - 1.0 1.4 2.0 0.3 0.8 1.7 3.0 3.6 d1951 1.0 - 2.0 1.6 1.5 0.3 0.8 1.5 1.6 0.75 - 2.25 (1) 1.7 2.0 0.5 1.4 3.0 3.5 d1952 2.0 - 4.0 1.8 1.5 0.3 0.8 1.5 1.6 1.5 - 4.5 (1) 1.9 2.0 0.5 1.4 3.0 3.5 d1953 2.6 - 5.2 2.0 1.6 0.3 0.8 1.5 1.8 1.95 - 5.85 (1) 2.1 2.1 0.5 1.4 3.0 3.5 d1954 4.0 - 8.0 2.4 1.7 0.3 0.8 1.5 1.6 3.0 - 9.0 (1) 2.5 2.2 0.5 1.4 3.0 3.5 d1955 5.0 - 10.0 2.6 1.7 0.5 0.9 1.5 1.6 3.75 - 11.25 (1) 2.7 2.2 0.7 1.4 3.0 3.5 d1956 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 1.5 3.0 3.5 d1958 8.0 - 18.0 3.0 (2) 1.8 (2) 0.7 1.0 1.5 1.6 6.0 - 18.0 (1) 3.0 (2) 1.8 (2) 0.9 1.5 3.0 3.5 mean attenuation range d1950a* .......................... 80 db all other units ................... 60db accuracy of attenuation o to 3odb ....................... 0.5 db > 30 to 50 db ................... 1.0 db > 50 to 60 db ................... 1.5 db > 60 to 80 db ................... 2.0 db (d195oa*only) monotonicity ...................... guaranteed phase shift ........................ see application note temperature coefficient ...... 0.025 db/ c power handling capability without performance degradation d1950a*,d1951 ............ 10 mw cw or peak all other units ................ 100 mw cw or peak survival power (from -65%c to +25%c; see fig. 2 for higher temperatures) all units .......................... 1 w average 25w peak (1 sec max pulse width) switching characteristics off time d195oa* ................... 600 nsec max all other units ............. 100 nsec max on time d1950a* ................... 10 sec max all other units ............. 1.6 sec max fall time d1950a* ................... 500 nsec max all other units ............. 20 nsec max rise time d195oa* ................... 10 sec max all other units ............. 1.5 sec max nominal control voltage characteristics range operating maximum d195oa* 0 to + 8v 15v all other units 0 to + 6v 15v transfer function ................. 10 db / volt input impedance ................... 10 kohms modulation bandwidth small signal d195oa* ................... 25 khz all other units ............. 500 khz page 1 of 2 herley: series d195 octave - band 11/17/2009 http://www.herley.com/index.cfm?act=product&prd=69
*model 1950a is a special-order product. consult facto ry before ordering. (1) where use of an option 59 external reset pulse (se e note 2 below) is not feasible, this option is avail able which will automatically sense the slope and magnitude of t he control signal and reset the unit to the insertion loss state within 200 nsec for a stop of 50 db or more. (2) an external terminal is provided for the user to a pply a fast (10 nsec, max rise time) positive-going 3-vol t pulse at least 0.5 sec wide to accelerate the return of t he attenuator to the insertion loss state with the sim ultaneous lowering of the control signal to the zero volt age level. this reset can be accomplished within 200 nsec. (3) the input impedance of units equipped with option 59 is a circuit equivalent to approximately 50 pf in ser ies with a parallel combination of 100 pf and 1000 ohms. dimensions and weights dimensional tolerances, unless otherwise indicated: .xx .02; .xxx .005 large signal d195oa* ................... 5 khz all other units ................. 50 khz power supply requirements .............. +12v 5%, 100 ma -12v 5%, 50 ma power supply rejection ..................... less than 0.1 db / volt change in either supply 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 3 sma female control connector 7 two sma male rf connectors 10 one sma male (j1) and one sma female (j2) rf connector 58 internally-generated reset to insertion loss (not available on d1950a) (1) 59 externally-triggered reset to insertion loss (not available on d1950a*) (2)(3) 61 20 db / volt transfer function with 0 to +3v control signal input (+4v for the d1950a*) 62 15 volt operation 64 smc male control connector 64a smb male control connector * model 1950a is a special - order product. consult factory before ordering. page 2 of 2 herley: series d195 octave - band 11/17/2009 http://www.herley.com/index.cfm?act=product&prd=69
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