page 1 of 8 digital step attenuator case style: dg983-2 the big deal ? wideband, operates up to 2.5 ghz ? glitchless attenuation transitions ? high ip3, 52 dbm product overview the dat-31575a+ series of 75 ? digital step attenuators provides adjustable attenuation from 0 to 31.5 db in 0.5 db steps. the control is a 6-bit serial/parallel interface, and the attenuators operate with either single positive or dual (positive and negative) supply voltage. dat-31575a+ series models are produced by a unique cmos process on silicon, offering the performance of gaas with the advantages of conven - tional cmos devices. feature advantages wideband operation, specifed from 1mhz to 2.5 ghz can be used in multiple applications such as various versions of docsis, satellite and defense, reducing part count. serial or parallel interface models available with serial or parallel interface mode to suit customer demand. good vswr, 1.3:1 typ. eases interfacing with adjacent components and results in low amplitude ripple. single positive supply models: (model suffxes: -sp+ and Cpp+) +2.3 to +3.6v+ use of single positive supply simplifes power supply design. an internal negative voltage generator supplies the desired negative voltage. single positive supply results in excellent spurious performance, -140 dbm typical. dual supply models: (model suffxes: -sn+ and Cpn+) +2.7 to +3.6v (positive) and -3.6 to -3.2v (negative) dual supply provides spurious-free operation. it also allows fast switching up to 1 mhz (vs. 25 khz for single supply). useable over a wide range of supply volt - ages, +2.3/2.7 to 5.2v wide range fo positive operating voltages allows the dat-31575a+ series of models to be used in a wide range of applications. see application note an-70-032 for operation above +3.6v footprint compatible to dat-31575-xx+ series (xx=sn/sp/pn/pp) can ft into existing footprint and provide wideband performance, to 2.5 ghz instead of 2.0 ghz. glitchless attenuation transitions, 0.26 typical compared to previous generation of digital attenuators which is a vast improvement. dat-31575a series key features 75 ? 0 to 31.5 db, 0.5 db step 1mhz to 2.5 ghz surface mount mini-circuits ? www.minicircuits.com p.o. box 350166, brooklyn, ny 11235-0003 (718) 934-4500 sales@minicircuits.com
page 2 of 8 product features ? single positive supply voltage ? immune to latch up ? glitchless attenuation transitions ? excellent accuracy, 0.1 db typ ? low insertion loss ? high ip3, +55-59 dbm typ ? very low dc power consumption ? excellent return loss, 18 db typ ? small size 4.0 x 4.0 mm typical applications ? docsis ? 3.1 ? portable wireless ? catv & dbs ? mmds & wireless lan ? wireless local loop ? unii & hiper lan ? power amplifer distortion canceling loops general description the DAT-31575A-SP+ is a 75 ? rf digital step attenuator that offers an attenuation range up to 31.5 db in 0.5 db steps. the control is a 6-bit serial interface, operating on single (positive) supply voltage. the dat- 31575a-sp+ is produced using a unique cmos process on silicon, offering the performance of gaas, with the advantages of conventional cmos devices. digital step attenuator 31.5 db, 0.5 db step 6 bit, serial control interface, single supply voltage 75 ? 1-2500 mhz DAT-31575A-SP+ case style: dg983-2 simplifed schematic digital serial control rf input 16db 8db 4db 2db 1db 0.5db rf out rev. or m155582 DAT-31575A-SP+ rs/cp 160908 mini-circuits ? www.minicircuits.com p.o. box 350166, brooklyn, ny 11235-0003 (718) 934-4500 sales@minicircuits.com +rohs compliant the +suffix identifies rohs compliance. see our web site for rohs compliance methodologies and qualifications
page 3 of 8 4. permanent damage may occur if any of these limits are exceeded. 5. operation between max operating and absolute max input power will result in reduced reliability. 1. i. loss values are de-embedded from test board loss (test boards insertion loss: 0.10db @100mhz, 0.40db @1200mhz, 0.55db @2000mhz, 0.75db @4000mhz). 2. for operation above +3.6v see application note, an-70-032 3. 0 volt during power up. switching specifcations parameter min. typ. max. units switching speed, 50% control to 90% or 10% of rf 0.4 0.7 sec switching control frequency 25 khz dc electrical specifcations parameter min. typ. max. units v dd dd 0 20 40 60 80 100 120 5 50 500 5000 iip2 (dbm) frequency (mhz) 0 db 31.5 db figure 1. ip2 vs. frequency and attenuation absolute maximum ratings 4 parameter ratings operating temperature -40c to 105c storage temperature -65c to 150c v dd rf electrical specifcations, 1-2500 mhz, t amb =25c, v dd =+3v, 75 ? parameter freq. range (ghz) min. typ. max. units accuracy @ 0.5 db attenuation setting 0.001-1.2 0.03 0.17 db 1.2-2.0 0.05 0.18 2.0-2.5 0.1 0.19 accuracy @ 1 db attenuation setting 0.001-1.2 0.03 0.18 db 1.2-2.0 0.1 0.20 2.0-2.5 0.1 0.23 accuracy @ 2 db attenuation setting 0.001-1.2 0.07 0.21 db 1.2-2.0 0.15 0.26 2.0-2.5 0.15 0.31 accuracy @ 4 db attenuation setting 0.001-1.2 0.05 0.27 db 1.2-2.0 0.15 0.36 2.0-2.5 0.2 0.47 accuracy @ 8 db attenuation setting 0.001-1.2 0.1 0.39 db 1.2-2.0 0.24 0.60 2.0-2.5 0.35 0.79 accuracy @ 16 db attenuation setting 0.001-1.2 0.23 0.63 db 1.2-2.5 0.8 1.0 2.0-2.5 0.8 1.43 insertion loss 1 @ all attenuator set to 0db 0.001-1.2 1.2 1.8 db 1.2-2.5 1.6 1.9 vswr 0.001-1.2 1.3 :1 1.2-2.5 1.4 input ip3 (at min. and max. attenuation) .005-2.5 55-69 dbm input ip2 .005-2.5 see fig. 1 dbm input power @ 0.1db compression (at min. and max. attenuation) 0.030-2.5 +30 dbm input operating power 1 mhz to 30 mhz see fig. 2 dbm >30 mhz +24 thermal resistance (junction to case) 25 c/w digital step attenuator DAT-31575A-SP+ mini-circuits ? www.minicircuits.com p.o. box 350166, brooklyn, ny 11235-0003 (718) 934-4500 sales@minicircuits.com
page 4 of 8 pin description pin confguration (top view) function pin number description c16 1 control for attenuation bit, 16db (note 3, 7) rf in 2 rf in port (note 1) data 3 serial interface data input (note 4) clock 4 serial interface clock input le 5 latch enable input (note 2) v dd 6 positive supply voltage n/c 7 not connected (note 7) n/c 8 not connected v dd 9 positive supply voltage gnd 10 ground connection gnd 11 ground connection gnd 12 ground connection (note 6) v dd 13 positive supply voltage rf out 14 rf out port (note 1) c8 15 control for attenuation bit, 8 db c4 16 control for attenuation bit, 4 db c2 17 control for attenuation bit, 2 db gnd 18 ground connection c1 19 control for attenuation bit, 1 db c0.5 20 control for attenuation bit, 0.5 db (note 7) gnd paddle paddle ground (note 5) parallel serial gnd gnd gnd gnd vdd vdd vdd n/c n/c rfout c8 le clock data rfin c16 c4 c2 c1 c0.5 2x2mm paddle ground 15 14 13 12 11 1 2 3 4 5 6 7 8 9 20 19 18 17 16 10 gnd gnd gnd gnd gnd vdd vdd pup2 pup1 rfout c8 le gnd n/c rfin c16 c4 c2 c1 c0.5 2x2mm paddle ground 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 device marking mcl pin 1 index ds75 figure 2. max input power vs. frequency. pulsed power: 5% duty cycle, 4620 s period 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 1.0 10.0 100.0 1000.0 input power (dbm) frequency (mhz) absolute max power max operating-pulsed (>= 30 mhz) max operating -cw & pulsed (< 30 mhz) max operating - cw ( 30 mhz) notes: 1. both rf ports must be held at 0vdc or dc blocked with an external series capacitor. 2. latch enable (le) has an internal 2m : to internal positive supply voltage. 3. place a 10k : resistor in series to be compatible with previous generation of models. and 10k : maybe omitted in new designs. 4. place a shunt 10k : resistor to gnd 5. the exposed solder pad on the bottom of the package (see pin confguration) must be grounded for proper device operation. 6. ground must be less than 80 mil (0.08) from pin 12 for proper device operation. 7. this pin has an internal 1m ? resistor to ground. digital step attenuator DAT-31575A-SP+ mini-circuits ? www.minicircuits.com p.o. box 350166, brooklyn, ny 11235-0003 (718) 934-4500 sales@minicircuits.com
page 5 of 8 the serial interface is a 6-bit serial in, parallel-out shift register buffered by a transparent latch. it is controlled by three cmos-compatible signals: data, clock, and latch enable (le). the data and clock inputs allow data to be serially entered into the shift register, a process that is independent of the state of the le input. the le input controls the latch. when le is high, the latch is transparent and the contents of the serial shift register control the attenuator. when le is brought low, data in the shift register is latched. the shift register should be loaded while le is held low to prevent the attenuator value from changing as data is entered. the le input should then be toggled high and brought low again, latching the new data. the timing for this operation is defned by figure 3 (serial interface timing diagram) and table 2 (serial interface ac characteristics). simplifed schematic figure 3: serial interface timing diagram table 2. serial interface ac characteristics symbol parameter min. max. units f clk serial data clock frequency (note 1) 10 mhz t clkh serial clock high time 30 ns t clkl serial clock low time 30 ns t lesup le set-up time after last clock falling edge 10 ns t lepw le minimum pulse width 30 ns t sdsup serial data set-up time before clock rising edge 10 ns t sdhld serial data hold time after clock falling edge 10 ns note 1. fclk verifed during the functional pattern test. serial programming sections of the functional pattern are clocked at 10mhz to verify fclk speci - fcation. the DAT-31575A-SP+ serial interface consists of 6 control bits that select the desired attenuation state, as shown in table 1 : truth table digital serial control rf input 16db 8db 4db 2db 1db 0.5db rf out table 1. truth table attenuation state c16 c8 c4 c2 c1 c0.5 reference 0 0 0 0 0 0 0.5 (db) 0 0 0 0 0 1 1 (db) 0 0 0 0 1 0 2 (db) 0 0 0 1 0 0 4 (db) 0 0 1 0 0 0 8 (db) 0 1 0 0 0 0 16 (db) 1 0 0 0 0 0 31.5 (db) 1 1 1 1 1 1 note: not all 64 possible combinations of c0.5 - c16 are shown in table le cl o c k dat a lsb msb t lesup t sdsup t l lepw t sdhld digital step attenuator DAT-31575A-SP+ mini-circuits ? www.minicircuits.com p.o. box 350166, brooklyn, ny 11235-0003 (718) 934-4500 sales@minicircuits.com
page 6 of 8 the DAT-31575A-SP+, uses a common 6-bit serial word format, as shown in table 3 : 6-bit attenuator se - rial programming register map. the frst bit, the msb, corresponds to the 16-db step and the last bit, the lsb, corresponds to the 0.5 db step. the DAT-31575A-SP+ always assumes a specifable attenuation setting on power-up, allowing a known at - tenuation state to be established before an initial serial control word is provided. when the attenuator powers up, the fve control bits are set to whatever data is present on the six data inputs (c0.5 to c16). this allows any one of the 64 attenuation settings to be specifed as the power-up state. power-up control settings table 3. 6-bit attenuator serial programming register map b5 b4 b3 b2 b1 b0 c16 c8 c4 c2 c1 c0.5 msb (frst in) lsb (last in) digital step attenuator DAT-31575A-SP+ mini-circuits ? www.minicircuits.com p.o. box 350166, brooklyn, ny 11235-0003 (718) 934-4500 sales@minicircuits.com
page 7 of 8 tb-344 evaluation board schematic diagram tb-344 bill of materials n1-n6, n11, n12, n15, n18 resistor 0603 10 kohm +/- 1% n10, n16, n17, n20 npo capacitor 0603 100pf +/- 5% n21 tantalum capacitor 0805 100nf +/- 10% n19 hex invert schmitt trigger msl1 note 1: both rf ports must be held at 0vdc or dc blocked with an external series capacitor. see note 1 **n12 can be reduced to 0 ohms digital step attenuator DAT-31575A-SP+ mini-circuits ? www.minicircuits.com p.o. box 350166, brooklyn, ny 11235-0003 (718) 934-4500 sales@minicircuits.com
page 8 of 8 esd rating human body model (hbm): class 1c (1000 to <2000v) in accordance with mil-std-883 method 3015 (pass 1500v). charge device model (cdm): class c3 (>1000v) per jesd22-c101f msl rating moisture sensitivity: msl1 in accordance with ipc/jedec j-std-020d performance data data table swept graphs s-parameter (s2p files) data set (.zip fle) case style dg983-2 plastic package, exposed paddle, lead fnish: nipdau tape & reel f87 standard quantities available on reel 7 reels with 20, 50, 100 or 200 devices 13 reels with 3k devices suggested layout for pcb design pl-203 evaluation board tb-344 environmental ratings env33t1 additional detailed technical information additional information is available on our dash board. to access this information click here msl test flow chart additional notes a. performance and quality attributes and conditions not expressly stated in this specifcation document are intended to be excluded and do not form a part of this specifcation document. b. electrical specifcations and performance data contained in this specifcation document are based on mini-circuits applicable established test performance criteria and measurement instructions. c. the parts covered by this specifcation document are subject to mini-circuits standard limited warranty and terms and conditions (collectively, standard terms); purchasers of this part are entitled to the rights and benefts contained therein. for a full statement of the standard terms and the exclusive rights and remedies thereunder, please visit mini-circuits website at www.minicircuits.com/mclstore/terms.jsp visual inspection electrical test sam analysis refow 3 cycles, 260c soak 85c/85rh 168 hours bake at 125c, 24 hours visual inspection electrical test sam analysis start finish digital step attenuator DAT-31575A-SP+ mini-circuits ? www.minicircuits.com p.o. box 350166, brooklyn, ny 11235-0003 (718) 934-4500 sales@minicircuits.com
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