for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com attenuators - digital - smt 5 5 - 1 discontinued product not recommended for new designs 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz general description features functional diagram 1 db lsb steps to 31 db cmos compatible serial data interface spi compatible serial output 0.4 db typical bit error 24 lead 4x4mm qfn package: 16mm2 included in the hmc-dk004 designers kit electrical speci cations, t a = +25 c, vcc = +3v to +5v typical applications the hmc271lp4 & hmc271lp4e are broadband 5-bit positive control gaas ic digital attenuators with cmos compatible serial-to-parallel drivers in low cost leadless qfn 4x4 mm smt packages. covering 0.7 to 3.7 ghz, the insertion loss is typically less than 2.5 db. the attenuator bit values are 1 (lsb), 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 cmos compatible serial control words are used to select each attenuation state. a single vcc bias of +3v to +5v applied through an external 5k ohm resistor is required. the hmc271lp4 / hmc271lp4e is ideal for: ? cellular/3g infrastructure ? fixed wireless, wimax & wibro ? test instrumentation parameter frequency min. typical 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 range 0.7 - 3.7 ghz 31 db return loss (rf1 & rf2, all atten. states) 0.7 - 1.4 ghz 1.4 - 2.7 ghz 2.7 - 3.7 ghz 12 15 16 db db db attenuation accuracy: (referenced to insertion loss) all attenuation states 0.7 - 0.9 ghz 0.9 - 2.2 ghz 2.2 - 3.7 ghz (0.4 + 5% of atten. setting) max (0.4 + 4% of atten. setting) max (0.4 + 5% of atten. setting) 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 third order intercept point (two-tone input power = 0 dbm each tone) vcc = 5v vcc = 3v 0.7 - 3.7 ghz 48 46 dbm dbm switching characteristics trise, tfall (10/90% rf) ton, toff (latch enable to 10/90% rf) 0.7 - 3.7 ghz 750 830 ns ns hmc271lp4 / 271lp4e v03.0809
for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com attenuators - digital - smt 5 5 - 2 discontinued product not recommended for new designs 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 (-40 to +85 deg. c.). 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 hmc271lp4 / 271lp4e v03.0809 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com attenuators - digital - smt 5 5 - 3 discontinued product not recommended for new designs digital control voltages truth table serial data input attenuation setting rf1 - rf2 c1 c2 c4 c8 c16 high high high high high reference 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. state 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 enable shift clock reset function x x l shift register cleared x ? h shift register clocked ? xh contents of shift register transferred to digital attenuator parameter symbol vcc = +5v vcc = +3v units min. max. min. max. serial input setup time ts 20 - 100 - ns hold time from serial input to shift clock th 0 - 5 - ns setup time from shift clock to latch enable tlsup 40 - 100 - ns propagation delay, latch enable to c1 through c16 tpd - 30 - 70 ns setup time from reset to shift clock -20-50-ns clock frequency (1/tclk) fclk - 30 - 10 mhz timing hmc271lp4 / 271lp4e v03.0809 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com attenuators - digital - smt 5 5 - 4 discontinued product not recommended for new designs logic / functional diagram programming example to select 1 db attenuation state hmc271lp4 / 271lp4e v03.0809 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com attenuators - digital - smt 5 5 - 5 discontinued product not recommended for new designs pin number function description interface schematic 1, 3, 4, 6, 10, 12, 13, 15, 16, 18 n/c these pins should be connected to pcb rf ground to maximize performance. 2, 17 rf1, rf2 this pin is dc coupled and matched to 50 ohms blocking capacitors are required. select value based on lowest frequency of operation. 5serial output serial data output. serial input data delayed by 8 clock cycles. 7reset see truth table, control voltage table and timing diagram. 8 shift clock 9 latch enable 11 ser ial in put 14 vcc supply voltage. 19 - 24 gnd package bottom has an exposed metal paddle that must also be connected to rf/dc ground. pin descriptions hmc271lp4 / 271lp4e v03.0809 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com attenuators - digital - smt 5 5 - 6 discontinued product not recommended for new designs application circuit dc blocking capacitors c1 & c2 are required on rf1 & rf2. choose c1 = c2 = 100 ~ 300 pf to allow lowest customer speci c frequency to pass with minimal loss. r1 = 5k ohm is required to supply voltage to the circuit through either pin 2 or pin 17. hmc271lp4 / 271lp4e v03.0809 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com attenuators - digital - smt 5 5 - 7 discontinued product not recommended for new designs absolute maximum ratings outline drawing electrostatic sensitive device observe handling precautions part number package body material lead finish msl rating package marking [3] hmc271lp4 low stress injection molded plastic sn/pb solder msl1 [1] h271 xxxx hmc271lp4e rohs-compliant low stress injection molded plastic 100% matte sn msl1 [2] h271 xxxx [1] max peak re ow temperature of 235 c [2] max peak re ow temperature of 260 c [3] 4-digit lot number xxxx package information notes: 1. leadframe material: copper alloy 2. dimensions are in inches [millimeters] 3. lead spacing tolerance is non-cumulative 4. pad burr length shall be 0.15mm maximum. pad burr height shall be 0.05mm maximum. 5. package warp shall not exceed 0.05mm. 6. all ground leads and ground paddle must be soldered to pcb rf ground. 7. refer to hittite application note for suggested land pattern. digital inputs (reset, shift clock, latch enable & serial input) -1.5 to (vcc + 1.5) v digital outputs (serial output) -0.5 to (vcc + 0.5) v dc current on serial output 35 ma bias voltage (vcc) +7v storage temperature -65 to +150 c operating temperature -40 to +85 c rf input power (0.7 - 3.7 ghz) +26 dbm esd sensitivity (hbm) class 1a hmc271lp4 / 271lp4e v03.0809 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
for price, delivery, and to place orders, please contact hittite microwave corporation: 20 alpha road, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 order on-line at www.hittite.com attenuators - digital - smt 5 5 - 8 discontinued product not recommended for new designs evaluation circuit board the circuit board used in the application should use rf circuit design techniques. signal lines should have 50 ohm impedance while the package ground leads and exposed ground paddle should be con- nected 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. the evaluation circuit board as shown is available from hittite microwave corpora- tion upon request. item description j1 - j2 pcb mount sma connector j3 2 mm molex header c1, c2 100 pf capacitor, 0402 pkg. c3 0.01 f capacitor, 0402 pkg. r1 5k ohm resistor, 0402 pkg. u1 hmc271lp4(e) digital attenuator pcb [2] 108780 evaluation pcb [1] reference this number when ordering complete evaluation pcb [2] circuit board material: rogers 4350 list of materials for evaluation pcb 108782 [1] hmc271lp4 / 271lp4e v03.0809 1 db lsb gaas mmic 5-bit serial control digital attenuator, 0.7 - 3.7 ghz
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