for price, delivery and to place orders: hittite microwave corporation, 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com application support: phone: 978-250-3343 or apps@hittite.com attenu a tors - digi t al - s m t 8 8 - 1 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz general description features functional diagram 1 db l s b s teps to 31 db cm os compatible s erial data interface s pi compatible s erial o utput 0.4 db t ypical bit e rror 24 lead 4x4mm qf n package: 16mm2 included in the hmc-dk004 designers kit electrical specifcations, t a = +25 c, vcc = +3v to +5v typical applications t he hmc271alp4( e ) is a broadband 5-bit positive control gaas ic digital attenuator with cm os com - patible serial-to-parallel drivers in a low cost lead- less qf n 4x4 mm s m t package. covering 0.7 to 3.7 ghz, the insertion loss is typically less than 2.5 db. t he attenuator bit values are 1 (l s b), 2, 4, 8, and 16 db for a total attenuation of 31 db. accuracy is excellent at 0.4 db typical with an iip3 of up to +48 dbm. five bit cm os compatible serial control words are used to select each attenuation state. a single vcc bias of +3v to +5v applied through an external 5 k o hm resistor is required. t he hmc271alp4( e ) is ideal for: ? cellular/3g infrastructure ? fixed wireless, wimax & wibro ? t est instrumentation parameter frequency min. t ypical max. units insertion loss 0.7 - 1.4 ghz 1.4 - 2.3 ghz 2.3 - 2.7 ghz 2.7 - 3.7 ghz 1.9 2.3 2.6 2.8 2.4 2.8 3.1 3.3 db db db db attenuation r ange 0.7 - 3.7 ghz 31 db r eturn loss ( rf1 & r f2, all atten. s tates) 0.7 - 1.4 ghz 1.4 - 2.7 ghz 2.7 - 3.7 ghz 12 15 16 db db db attenuation accuracy: ( r eferenced to insertion loss) all attenuation s tates 0.7 - 0.9 ghz 0.9 - 2.2 ghz 2.2 - 3.7 ghz (0.4 + 5% of atten. s etting) max (0.4 + 4% of atten. s etting) max (0.4 + 6% of atten. s etting) max db db db input power for 0.1 db compression vcc = 5v vcc = 3v 0.7 - 3.7 ghz 24 22 dbm dbm input t hird o rder intercept point (t wo-tone input power = 0 dbm each t one) vcc = 5v vcc = 3v 0.7 - 3.7 ghz 48 46 dbm dbm s witching characteristics trise , tfall (10/90% rf) ton, toff (latch e nable to 10/90% rf) 0.7 - 3.7 ghz 750 830 ns ns hmc271alp4 / 271alp4e v02.0311
for price, delivery and to place orders: hittite microwave corporation, 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com application support: phone: 978-250-3343 or apps@hittite.com attenu a tors - digi t al - s m t 8 8 - 2 bit error vs. attenuation state return loss rf1, rf2 (only major states are shown) insertion loss normalized attenuation (only major states are shown) note: all data typical over voltage (+3v to +5v) & temperature (-40c to +85c). bit error vs. frequency (only major states are shown) relative phase vs. frequency (only major states are shown) -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 +25c +85c -40c insertion loss (db) frequency (ghz) -30 -25 -20 -15 -10 -5 0 0.5 1 1.5 2 2.5 3 3.5 4 return loss (db) frequency (ghz) 1 db 16 db 31 db 2 db 8 db 4 db i.l. -35 -30 -25 -20 -15 -10 -5 0 0.5 1 1.5 2 2.5 3 3.5 4 normalized attenuation (db) frequency (ghz) -1 -0.5 0 0.5 1 1.5 2 0 4 8 12 16 20 24 28 32 bit error (db) attenuation state (db) 2.4 ghz 0.9 ghz 1.9 ghz 3.5 ghz -1 0 1 2 3 4 0.5 1 1.5 2 2.5 3 3.5 4 bit error (db) frequency (ghz) 16 db 31 db 1, 2, 4 db 8 db -100 -75 -50 -25 0 25 50 75 100 0 0.5 1 1.5 2 2.5 3 3.5 4 relative phase (deg.) frequency (ghz) 31 db 16 db 1, 2, 4, 8 db hmc271alp4 / 271alp4e v02.0311 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery and to place orders: hittite microwave corporation, 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com application support: phone: 978-250-3343 or apps@hittite.com attenu a tors - digi t al - s m t 8 8 - 3 digital control voltages truth table s erial data input attenuation s etting rf1 - rf2 c1 c2 c4 c8 c16 high high high high high r eference i.l. low high high high high 1 db high low high high high 2 db high high low high high 4 db high high high low high 8 db high high high high low 16 db low low low low low 31 db max. atten. any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected. s tate vcc = +5v vcc = +3v low 0 to 1.3v 0 to 0.7v high 3.5 to 5v 2.3 to 3v -1.2 -0.8 -0.4 0 0.4 0.8 1.2 0.5 1 1.5 2 2.5 3 3.5 4 step error (db) frequency (ghz) worst case step error between successive attenuation states timing diagram serial input truth table latch e nable s hift clock r eset function x x l s hift register cleared x h s hift register clocked x h contents of shift register transferred to digital attenuator parameter s ymbol vcc = +5v vcc = +3v u nits min. max. min. max. s erial input s etup t ime ts 20 - 100 - ns hold time from s erial input to s hift clock th 0 - 5 - ns s etup time from s hift clock to latch e nable tlsup 40 - 100 - ns propagation delay, latch e nable to c1 through c16 tpd - 30 - 70 ns s etup time from r eset to s hift clock - 20 - 50 - ns clock frequency (1/tclk) fclk - 30 - 10 mhz timing hmc271alp4 / 271alp4e v02.0311 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery and to place orders: hittite microwave corporation, 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com application support: phone: 978-250-3343 or apps@hittite.com attenu a tors - digi t al - s m t 8 8 - 4 logic / functional diagram programming example to select 1 db attenuation state hmc271alp4 / 271alp4e v02.0311 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery and to place orders: hittite microwave corporation, 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com application support: phone: 978-250-3343 or apps@hittite.com attenu a tors - digi t al - s m t 8 8 - 5 pin n umber function description interface s chematic 1, 3, 4, 6, 10, 12, 13, 15, 16, 18 n /c t hese pins are not connected internally. however, all data shown herein was measured with these pins connected to r f/dc ground. 2, 17 r f1, r f2 t his pin is dc coupled and matched to 50 o hms blocking capacitors are required. s elect value based on lowest frequency of operation. 5 s erial o utput s erial data output. s erial input data delayed by 8 clock cycles. 7 r eset s ee truth table, control voltage table and timing diagram. 8 s hift clock 9 latch e nable 11 s erial input 14 vcc s upply voltage. 19 - 24 g n d package bottom has an exposed metal paddle that must also be connected to r f/dc ground. pin descriptions hmc271alp4 / 271alp4e v02.0311 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery and to place orders: hittite microwave corporation, 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com application support: phone: 978-250-3343 or apps@hittite.com attenu a tors - digi t al - s m t 8 8 - 6 application circuit dc blocking capacitors c1 & c2 are required on rf1 & rf2. choose c1 = c2 = 100 ~ 300 pf to allow lowest customer specifc frequency to pass with minimal loss. r1 = 5 kohm is required to supply voltage to the circuit through either pin 2 or pin 17. hmc271alp4 / 271alp4e v02.0311 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery and to place orders: hittite microwave corporation, 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com application support: phone: 978-250-3343 or apps@hittite.com attenu a tors - digi t al - s m t 8 8 - 7 absolute maximum ratings outline drawing e l e c trost a t ic sens i t iv e de vic e o b ser v e ha n dli n g p re ca ut i ons package information notes : 1. l e adf r am e ma ter ial: c o pp er all o y 2. dim ens i ons a re i n i n ch es [millim eters ] 3. l e ad s paci n g to l er a n c e i s non -c u m u la t iv e 4. pad b urr l en g t h s hall b e 0.15mm maxim u m. pad b urr h e igh t s hall b e 0.05mm maxim u m. 5. packag e wa r p s hall not e xc ee d 0.05mm. 6. all g roun d l e ad s a n d g roun d paddl e m ust b e so ld ere d to pcb r f g roun d. 7. re f er to hi tt i te applica t i on note f or su gg este d la n d pa ttern . digital inputs ( r eset, s hift clock, latch e nable & s erial input) -0.5 to (vcc + 0.5) v digital o utputs ( s erial o utput) -0.5 to (vcc + 0.5) v dc current on s erial o utput 35 ma bias voltage (vcc) +5.6 v s torage t emperature -65 to +150 c o perating t emperature -40 to +85 c r f input power (0.7 - 3.7 ghz) +26 dbm es d s ensitivity (hbm) class 1a hmc271alp4 / 271alp4e v02.0311 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz part n umber package body material lead finish m s l r ating package marking [3] hmc271alp4 low s tress injection molded plastic s n/pb s older m s l1 [1] h271a xxxx hmc271alp4 e r oh s -compliant low s tress injection molded plastic 100% matte s n m s l1 [2] h271a xxxx [1] max peak refow temperature of 235 c [2] max peak refow temperature of 260 c [3] 4-digit lot number xxxx
for price, delivery and to place orders: hittite microwave corporation, 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com application support: phone: 978-250-3343 or apps@hittite.com attenu a tors - digi t al - s m t 8 8 - 8 evaluation circuit board t he circuit board used in the application should use r f circuit design techniques. s ignal lines sho- uld have 50 o hm impedance while the package ground leads and exposed ground paddle should be connected directly to the ground plane similar to that shown below. a sufficient number of via holes should be used to connect the top and bottom ground planes. t he evaluation circuit board as shown is available from hittite microwave corpora - tion upon request. item description j1 - j2 pcb mount s ma connector j3 18 pin dc connector j6, j7 dc pin c1, c2 100 pf capacitor, 0402 pkg. c3 0.01 f capacitor, 0402 pkg. r 1 5 k o hm r esistor, 0402 pkg. u 1 hmc271alp4( e ) digital attenuator pcb [2] 108780 e valuation pcb [1] r eference this number when ordering complete evaluation pcb [2] circuit board material: r ogers 4350 list of materials for evaluation pcb 108782 [1] hmc271alp4 / 271alp4e v02.0311 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
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