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 attenuators - digital - smt 8 8 - 1 hmc629lp4 / 629LP4E 3 db lsb gaas mmic 4-bit digital attenuator, dc - 6 ghz v07.0410 functional diagram electrical specifcations, t a = +25 c, 50 ohm system, with vdd = +5v & vctl = 0/+5v (unless otherwise noted) the hmc629lp4(e) is a broadband 4-bit gaas ic digital attenuator in a low cost leadless smt package. this versatile digital attenuator incorporates off-chip ac ground capacitors for near dc operation, making it suitable for a wide variety of rf and if applications. the dual mode control interface is cmos/ttl compatible, and accepts either a three wire serial input or a 4-bit parallel word. for applications which require only 33 db of attenuation range, the hmc629lp4(e) provides excellent attenuation accuracy up to 10 ghz. the hmc629lp4(e) is housed in a rohs compliant 4x4 mm qfn leadless package, and requires no external matching components. parameter frequency (ghz) min. typ. max. units insertion loss dc - 6 2.5 5 db db attenuation range dc - 6 45 db return loss (attin, attout, all atten. states) dc - 6 17 db attenuation accuracy: (referenced to insertion loss) all attenuation states (0.50 + 5% of atten. setting) max. db db typical applications features general description the hmc629lp4(e) is ideal for: ? cellular/3g infrastructure ? wibro / wimax / 4g ? microwave radio & vsat ? test equipment and sensors ? if & rf applications 3 db lsb steps to 45 db power-up state selection low insertion loss: 2.5 db ttl/cmos compatible, serial, parallel or latched parallel control 0.25 db typical step error single +3v or +5v supply 24 lead 4x4mm smt package: 16mm 2
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 attenuators - digital - smt 8 8 - 2 output return loss (only major states are shown) input return loss (only major states are shown) normalized attenuation (only major states are shown) insertion loss vs. temperature hmc629lp4 / 629LP4E v07.0410 3 db lsb gaas mmic 4-bit digital attenuator, dc - 6 ghz -40 -35 -30 -25 -20 -15 -10 -5 0 0 2 4 6 8 10 return loss (db) frequency (ghz) -40 -35 -30 -25 -20 -15 -10 -5 0 0 2 4 6 8 10 return loss (db) frequency (ghz) -60 -50 -40 -30 -20 -10 0 0 2 4 6 8 10 normalized attenuation (db) frequency (ghz) -20 -15 -10 -5 0 0 2 4 6 8 10 +25 c +85 c -40 c insertion loss (db) frequency (ghz) bit error vs. frequency (only major states are shown) bit error vs. attenuation state -6 -4 -2 0 2 4 6 0 2 4 6 8 10 bit error (db) frequency (ghz) all bits bit 24 -10 -8 -6 -4 -2 0 2 4 6 8 10 0 5 10 15 20 25 30 35 40 45 bit error (db) attenuation state (db) (7, 8, 10) ghz (1, 2, 4, 5) 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 attenuators - digital - smt 8 8 - 3 hmc629lp4 / 629LP4E v07.0410 3 db lsb gaas mmic 4-bit digital attenuator, dc - 6 ghz step error vs. frequency (only major states are shown) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 0 2 4 6 8 10 step error (db) frequency (ghz) bit 24 bit (3, 6, 12) all bits serial control interface -100 -80 -60 -40 -20 0 20 40 60 80 100 0 1 2 3 4 5 6 7 8 9 10 relative phase (deg) frequency (ghz) (3, 6, 12) db 24 db 45 db normal relative phase vs. frequency the hmc629LP4E contains a 3-wire spi compatible digital interface (serin, clk, le). the serial control interface is activated when p/s is kept high. the 6-bit serial word must be loaded msb frst. the positive-edge sensitive clk and le requires clean transitions. if mechanical switches are used, sufficient debouncing should be provided. when le is high, 4-bit data in the serial input register is transferred to the attenuator. when le is high clk is masked to prevent data transition during output loading. when p/s is low, 3-wire spi interface inputs (serin, clk, le) are disabled and the input register is loaded with parallel digital inputs (d0-d5). when le is high, 4-bit parallel data changes the state of the part per truth table. for all modes of operations, the state will stay constant while le is kept low.
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 attenuators - digital - smt 8 8 - 4 parallel mode (direct parallel mode & latched parallel mode) note: the parallel mode is enabled when p/s is set to low. direct parallel mode - the attenuation state is changed by the control voltage inputs directly. the le (latch enable) must be at a logic high to control the attenuator in this manner. latched parallel mode - the attenuation state is selected using the control voltage inputs and set while the le is in the low state. the attenuator will not change state while le is low. once all control voltage inputs are at the desired states the le is pulsed. see timing diagram below for reference. hmc629lp4 / 629LP4E v07.0410 3 db lsb gaas mmic 4-bit digital attenuator, dc - 6 ghz timing diagram (latched parallel mode) bias voltage vdd (vdc) idd (typ.) (ma) 5 2.0 control voltage input attenuation state d3 d2 d1 d0 high high high high reference i.l. high high high low 3 db high high low high 6 db high low high high 12 db low high high high 24 db any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected. truth table pup truth table le pup1 pup2 attenuation state 0 0 0 45 db 0 1 0 45 db 0 0 1 45 db 0 1 1 insertion loss 1 x x 0 to 45 db note: power-up with le= 1 provides direct parallel operation with d0 - d3. parameter typ. min. serial period, t sck 100 ns control set-up time, t cs 20 ns control hold-time, t ch 20 ns le setup-time, t ln 10 ns min. le pulse width, t lew 10 ns min le pulse spacing, t les 630 ns serial clock hold-time from le, t ckn 10 ns hold time, t ph. 0 ns latch enable minimum width, t len 10 ns setup time, t ps 2 ns control voltage table state vdd = +3v vdd = +5v low 0 to 0.5v @ <1 a 0 to 0.8v @ <1 a high 2 to 3v @ <1 a 2 to 5v @ <1 a power-up states if le is set to logic low at power-up, the logic state of pup1 and pup2 determines the power-up state of the part per pup truth table. if the le is set to logic high at power-up, the logic state of d3-d0 determines the power-up state of the part per truth table. the attenuator latches in the desired power-up state approximately 200 ms after power-up. power-on sequence the ideal power-up sequence is: gnd, vdd, digital inputs, rf inputs. the relative order of the digital inputs are not important as long as they are powered after vdd / gnd
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 attenuators - digital - smt 8 8 - 5 absolute maximum ratings rf input power (dc - 6 ghz) 28 dbm (t = +85 c) digital inputs ( data , shift clock, latch enable & serial input) -0.5 to vdd +0.5v bias voltage (vdd) 5.6v channel temperature 150 c continuous pdiss (t = 85 c) (derate 10 mw/ c above 85 c) [1] 0.66 w thermal resistance 98.5 c/w storage temperature -65 to +150 c operating temperature -40 to +85 c electrostatic sensitive device observe handling precautions hmc629lp4 / 629LP4E v07.0410 3 db lsb gaas mmic 4-bit digital attenuator, dc - 6 ghz outline drawing 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 pcb design and assembly for qfn packages application note for suggested land pattern. part number package body material lead finish msl rating package marking [3] hmc629lp4 low stress injection molded plastic sn/pb solder msl1 [1] h629 xxxx hmc629LP4E rohs-compliant low stress injection molded plastic 100% matte sn msl1 [2] h629 xxxx [1] max peak refow temperature of 235 c [2] max peak refow temperature of 260 c [3] 4-digit lot number xxxx package information
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 attenuators - digital - smt 8 8 - 6 hmc629lp4 / 629LP4E v07.0410 3 db lsb gaas mmic 4-bit digital attenuator, dc - 6 ghz pin number function description interface schematic 24 p/s see truth table, control voltage table and timing diagram. 1 clk 2 serin 3 le 4, 15 gnd these pins and package bottom must be connected to rf/dc ground. 5, 14 attin, attout these pins are dc coupled and matched to 50 ohms. blocking capacitors are required. select value based on lowest frequency of operation. 6 - 13 acg1 - acg6 external capacitors to ground are required. select value for lowest frequency of operation. place capacitor as close to pins as possible. see application circuit. 16 serout serial input data delayed by 6 clock cycles. 17, 18 pup2, pup1 see truth table, control voltage table and timing diagram. 20 - 23 d3, d2, d1, d0 19 vdd supply voltage pin descriptions
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 attenuators - digital - smt 8 8 - 7 hmc629lp4 / 629LP4E v07.0410 3 db lsb gaas mmic 4-bit digital attenuator, dc - 6 ghz application circuit
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 attenuators - digital - smt 8 8 - 8 hmc629lp4 / 629LP4E v07.0410 3 db lsb gaas mmic 4-bit digital attenuator, dc - 6 ghz evaluation pcb 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 paddle should be connected directly to the ground plane similar to that shown. a sufficient number of via holes should be used to connect the top and bottom ground planes. the evaluation circuit board shown is available from hit - tite upon request. list of materials for evaluation pcb 118889 [1] item description j1, j2 pcb mount sma connector j10, j12 dc pin j11 18 pin dc connector c1 - c2 100 pf, capacitor 0402 pkg c3 1000 pf, capacitor 0402 pkg c4 - c8 330 pf, capacitor 0402 pkg r1 - r10 100 kohm resistor, 0402 pkg. sw1 spdt 4 position dip switch u1 hmc629lp4(e) digital attenuator pcb [2] 118888 evaluation pcb [1] reference this number when ordering complete evaluation pcb [2] circuit board material: arlon 25fr
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