general description the max5430/max5431 are digitally programmablehigh-precision resistor arrays for pgas. the max5430/ max5431 operate from a single 15v supply or dual ?5v supplies, and consume only 35? supply current. these devices are intended for programmable-gain amplifier (pga) applications and consist of fixed resis- tor-dividers. each device has digitally controlled con- tacts with four precision noninverting gains of 1, 2, 4, and 8 with ratio accuracy of 0.025% (max5430a/ max5431a), 0.09% (max5430b/max5431b), or 0.5% (max5430c/max5431c). the max5431 includes an on-chip matching resistor for op amp input bias-current compensation. the max5430/max5431 are available in space-saving 8-pin sot23 and 10-pin ?ax packages, and speci- fied over the extended temperature range of (-40? to+85?). applications general-purpose programmable noninvertingamplifier programmable instrumentation amplifier features ? four noninverting pga gain configurations: a v = 1, 2, 4, and 8 ? precision 0.025% ratio accuracy ? on-chip matching resistor for op amp bias-current compensation (max5431) ? single-supply +12v to +15v, or dual-supply 12vto 15v operation ? low 35a supply current ? cmos/ttl logic compatible 2-wire parallelinterface ? space-saving 8-pin sot23 and 10-pin maxpackages ? +3v logic compatibility max5430/max5431 15v digitally programmable precision voltage-dividers for pgas ________________________________________________________________ maxim integrated products 1 1 23 4 5 10 98 7 6 gnd match_l match_h v dd max5431 max top view h w d0d1 v ss l pin configurations ordering information decoder match_hmatch_l max5431 only h v dd w l gnd v ss max5430max5431 d0 d1 functional diagram 19-2222; rev 2; 7/05 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp range pin- package gain accuracy max5430 aeka -40? to +85? 8 sot23 0.025% max5430beka -40? to +85? 8 sot23 0.09% max5430ceka -40? to +85? 8 sot23 0.5% max5431 aeub -40? to +85? 10 ?ax 0.025% max5431beub -40? to +85? 10 ?ax 0.09% max5431ceub -40? to +85? 10 ?ax 0.5% pin configurations continued at end of data sheet. ?ax is a registered trademark of maxim integrated products, inc. downloaded from: http:///
max5430/max5431 15v digitally programmable precision voltage-dividers for pgas 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v dd = +15v, v ss = -15v, gnd = 0, t a = t min to t max . typical values are at t a = +25?, unless otherwise noted.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 1: all devices are 100% production tested at t a = +25?. sot23 packages are guaranteed by design from t a = t min to t max. note 2: gain accuracy is measured without load at pin w. v dd to gnd ............................................................-0.3v to +17v v ss to gnd.............................................................-17v to +0.3v d0, d1 to gnd .........................................................-0.3v to +6v h, l, w, match_ to gnd ................(v ss - 0.3v) to (v dd + 0.3v) current into any signal pin...............................................?0ma continuous power dissipation (t a = +70?) 8-pin sot23 (derate 8.9mw/? above +70?)............714mw 10-pin ?ax (derate 10.3mw/? above +70?) .........825mw operating temperature range ...........................-40? to +85? storage temperature range .............................-60? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units dc performance max543_a 0.025 max543_b 0.09 divider ratio accuracy (note 2) v h = +5v, v l = -5v max543_c 0.5 % resistance between h and l (figure 1) r hl 57 k ? capacitance at analog pins c analog 2p f ratio = 1 0.5 matching resistor ratio = 2, 4, 8 14 k ? ratio = 1 0.5 wiper resistance r w ratio = 2, 4, 8 14 k ? w, h, l, match_h, match _l voltage range v analog v ss v dd v digital inputs input high voltage v ih 2.4 v input low voltage v il 0.8 v input leakage current d0, d1 = 5v or gnd ? ? input capacitance c in 5p f power requirements negative supply current i ss 12 5 a positive supply current i dd 35 60 ? positive power-supply voltage v dd 10.8 15.75 v negative power-supply voltage v ss -15.75 0v dynamic performance switching time t d2w , t h2w 0.3 ? downloaded from: http:///
max5430/max5431 15v digitally programmable precision voltage-dividers for pgas _______________________________________________________________________________________ 3 -0.0020 -0.0015 -0.0005-0.0010 0 0.0005 0.0015 0.00200.0010 -40 -10 5 20 temperature ( c) -25 35 5 06580 max543_a divider ratio accuracy vs. temperature (ratio = 1) max5430 toc01 divider ratio accuracy (%) -0.010 -0.006-0.008 -0.002-0.004 0.002 0 0.004 0.008 0.0100.006 -40 -10 5 20 temperature ( c) -25 35 50 65 80 max543_a divider ratio accuracy vs. temperature (ratio = 2) max5430 toc02 divider ratio accuracy (%) -0.010 -0.006-0.008 -0.002-0.004 0.002 0 0.004 0.0080.006 0.010 -40 -10 5 20 temperature ( c) -25 35 50 65 80 max543_a divider ratio accuracy vs. temperature (ratio = 4) max5430 toc03 divider ratio accuracy (%) -0.010 -0.006-0.008 -0.002-0.004 0.002 0 0.004 0.0080.006 0.010 -40 -10 5 20 temperature ( c) -25 35 5 06580 max543_a divider ratio accuracy vs. temperature (ratio = 8) max5430 toc04 divider ratio accuracy (%) -0.0020 -0.0015 -0.0005-0.0010 0.0005 0 0.0010 0.0015 0.0020 -40 -10 5 20 temperature ( c) -25 35 50 65 80 max543_b divider ratio accuracy vs. temperature (ratio = 1) max5430 toc05 divider ratio accuracy (%) -0.020 -0.015 -0.005-0.010 0 0.005 0.0150.010 0.020 -40 -10 5 20 temperature ( c) -25 35 5 06580 max543_b divider ratio accuracy vs. temperature (ratio = 2) max5430 toc06 divider ratio accuracy (%) -0.010 -0.006-0.008 -0.004 0 -0.002 0.0100.008 0.006 0.004 0.002 -40 -10 5 20 -25 35 5 06580 max543_b divider ratio accuracy vs.temperature (ratio = 4) max5430 toc07 divider ratio accuracy (%) temperature ( c) -0.010 -0.006-0.008 -0.002-0.004 0.002 0 0.004 0.008 0.006 0.010 -40 -10 5 20 temperature ( c) -25 35 5 06580 max543_b divider ratio accuracy vs. temperature (ratio = 8) max5430 toc08 divider ratio accuracy (%) -0.010 -0.006-0.008 -0.004 0 0.004 0.006 0.008 0.010 11 12 13 14 15 max543_a divider ratio accuracy vs. positive supply (v ss = -15v) max5430 toc09 positive supply (v) divider ratio accuracy (%) ratio 1 -0.002 0.002 ratio 2 ratio 8 ratio 4 t ypical operating characteristics (v dd = +15v, v ss = -15v or v ss = gnd, v h = 5v, v l =-5v, t a = 25?, unless otherwise noted.) (note 3) downloaded from: http:///
max5430/max5431 15v digitally programmable precision voltage-dividers for pgas 4 _______________________________________________________________________________________ t ypical operating characteristics (continued) (v dd = +15v, v ss = -15v or v ss = gnd, v h = 5v, v l =-5v, t a = 25?, unless otherwise noted.) (note 3) -0.010 -0.004-0.006 -0.008 -0.002 0 0.002 0.004 0.006 0.008 0.010 11 12 13 14 15 max543_b divider ratio accuracy vs. positive supply (v ss = -15v) max5430 toc10 positive supply (v) divider ratio accuracy (%) ratio 2 ratio 4 ratio 1 ratio 8 11 12 13 14 15 max543_a divider ratio accuracy vs. positive supply (v ss = 0v) max5430 toc11 positive supply (v) divider ratio accuracy (%) ratio 2 ratio 4 ratio 1 ratio 8 -0.010 -0.004-0.006 -0.008 -0.002 0 0.002 0.004 0.006 0.008 0.010 v l = 0 -0.010 -0.004-0.006 -0.008 -0.002 0 0.002 0.004 0.006 0.008 0.010 11 12 13 14 15 max543_b divider ratio accuracy vs. positive supply (v ss = 0v) max5430 toc12 positive supply (v) divider ratio accuracy (%) ratio 2 ratio 4 ratio 1 ratio 8 v l = 0 -15 -12 -6 -9 -3 0 max543_a divider ratio accuracy vs. negative supply max5430 toc13 negative supply (v) divider ratio accuracy (%) -0.010 -0.004-0.006 -0.008 -0.002 0 0.002 0.004 0.006 0.008 0.010 ratio 2 ratio 1 ratio 8 ratio 4 v l = 0 0 10 5 2015 25 30 -40 -10 5 20 -25 35 50 65 80 supply current vs. temperature max5430 toc15 temperature ( c) supply current ( a) d0, d1 = 0v d0, d1 = 5v note 3: for max543_c accuracy typical operating characteristics , refer to max543_b accuracy typical operating characteristics . -15 -12 -6 -9 -3 0 max543_b divider ratio accuracy vs. negative supply max5430 toc14 negative supply (v) divider ratio accuracy (%) -0.010 -0.004-0.006 -0.008 -0.002 0 0.002 0.004 0.006 0.008 0.010 ratio 2 ratio 1 ratio 8 ratio 4 downloaded from: http:///
max5430/max5431 15v digitally programmable precision voltage-dividers for pgas _______________________________________________________________________________________ 5 pin description pin max5431 max5430 name function 18v dd positive power supply 2 match_h matching resistor high terminal 37 gnd ground 46h high terminal of resistive-divider 55l low terminal of resistive-divider 6 match_l matching resistor low terminal 74v ss negative power supply 83w wiper terminal of resistive-divider 92 d1 second bit digital input (msb) (table 1) 10 1 d0 first bit digital input (lsb) (table 1) detailed description the max5430/max5431 are digitally programmable pre- cision resistor arrays. these devices have fixed resistor- dividers with digitally controlled contacts, providing four precision noninverting gains of 1, 2, 4, and 8 for pga applications (see functional diagram and figure 1). the max5430/max5431 achieve ratio accuracies of 0.025% (max5430a/max5431a), 0.09% (max5430b/max5431b),or 0.5% (max5430c/max5431c). the end-to-end resistance from h to l is 57k ? . the impedance seen at w is designed to be the same 14k ? for gain settings 2, 4, and 8, ensuring excellent op ampinput-resistance balance, regardless of gain setting. in a gain of 1 configuration, h is internally connected to w with a typical resistance of 500 ? . matching resistor (max5431) the max5431 includes a matching resistor to compen-sate the offset voltage due to the input bias current of the op amp. the resistance from match_h to match_l is a fixed matching resistor, equal to the resistance seen at w for gains of 2, 4, and 8. in the gain of 1, an internal switch short circuits match_h and match_l. this internal switch matches the imped- ance of the switch between h and w. figure 1. simplified functional diagram 4r2r ratio = 2 ratio = 1 r l w h ratio = 4 ratio = 8 r digital inputs d1 d0 gain 00 1 01 2 10 4 11 8 table 1. logic-control truth table downloaded from: http:///
digital interface operation the max5430/max5431 feature a simple two-bit paral-lel programming interface. d1 and d0 program the gain setting according to the logic-control truth table (see table 1). the digital interface is cmos/ttl logic com- patible. applications information programmable-gain amplifier the max5430/max5431 are ideally suited for high-pre-cision pga applications. the typical application circuit of figure 2 uses the max5431 with matching resistor to compensate for voltage offset due to op amp input bias currents. use the max5430 with an ultra-low input bias current op amp (see figure 3). power supplies and bypassing the max5430/max5431 operate from dual ?5v sup-plies or a single 15v supply. for dual supplies, bypass v dd and v ss with 0.1? ceramic capacitors to gnd. for single supply, connect v ss to gnd and bypass v dd with a 0.1? ceramic capacitor to gnd. switching time and layout concerns the switching time of the max5430/max5431 dependson the capacitive loading at w. for best performance, reduce parasitic board capacitance by minimizing the circuit board trace from w to the op amp inverting input, and choose an op amp with low input capacitance. max5430/max5431 15v digitally programmable precision voltage-dividers for pgas 6 _______________________________________________________________________________________ 15v match_lw h 15v match_h v ss v dd gnd l max5431 v in v out 15v w h 15v v ss v dd gnd l max5430 v in v out figure 2. max5431 typical application circuit pga with inputi bias matching figure 3. programmable-gain amplifier using the max5430 12 8 7 sot23 top view 3 4 6 5 max5430 v dd d0 v ss l h w d1 gnd pin configurations (continued) chip information transistor count: 121process: cmos downloaded from: http:///
max5430/max5431 15v digitally programmable precision voltage-dividers for pgas maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 _____________________ 7 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. sot23, 8l .eps rev. document control no. approval proprietary information title: 3.00 2.60 e c e1 e between 0.08mm and 0.15mm from lead tip. 8. meets jedec mo178. 8 0.60 1.75 0.30 l2 0 e1 e l 1.50 e1 0.65 bsc. 1.95 ref. 0.25 bsc. gauge plane seating plane c c l pin 1 i.d. dot (see note 6) l c l c a2 e1 d detail "a" 5. coplanarity 4 mils. max. note: 7. solder thickness measured at flat section of lead 6. pin 1 i.d. dot is 0.3 mm ? min. located above pin 1. 4. package outline inclusive of solder plating. 3. package outline exclusive of mold flash & metal burr. heel of the lead parallel to seating plane c. 2. foot length measured from lead tip to upper radius of 1. all dimensions are in millimeters. l2 l a1 a 0.45 1.30 0.15 1.45 max 0.28 b 0.90 a2 0.00 a1 0.90 a min symbol 3.00 0.20 2.80 d 0.09 c see detail "a" l c b e d 1 21-0078 1 package outline, sot-23, 8l body 0 0 10lumax.eps package outline, 10l umax/usop 1 1 21-0061 i rev. document control no. approval proprietary information title: top view front view 1 0.498 ref 0.0196 ref s 6 side view bottom view 0 0 6 0.037 ref 0.0078 max 0.006 0.043 0.118 0.120 0.199 0.0275 0.118 0.0106 0.120 0.0197 bsc inches 1 10 l1 0.0035 0.007 e c b 0.187 0.0157 0.114 h l e2 dim 0.116 0.114 0.116 0.002 d2 e1 a1 d1 min - a 0.940 ref 0.500 bsc 0.090 0.177 4.75 2.89 0.40 0.200 0.270 5.05 0.70 3.00 millimeters 0.05 2.89 2.95 2.95 - min 3.00 3.05 0.15 3.05 max 1.10 10 0.60.1 0.60.1 0.500.1 h 4x s e d2 d1 b a2 a e2 e1 l l1 c gage plane a2 0.030 0.037 0.75 0.95 a1 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) downloaded from: http:///
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