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general description the MAX9943/max9944 is a family of high-voltage amplifiers that offers precision, low drift, and low-power consumption. the MAX9943 (single) and max9944 (dual) op amps offer 2.4mhz of gain-bandwidth product with only 550? of supply current per amplifier. the MAX9943/max9944 family has a wide power sup- ply range operating from ?v to ?9v dual supplies or a 6v to 38v single supply. the MAX9943/max9944 is ideal for sensor signal condi- tioning, high-performance industrial instrumentation and loop-powered systems (e.g., 4ma?0ma transmitters). the MAX9943 is offered in a space-saving 6-pin tdfn or 8-pin ?ax package. the max9944 is offered in an 8-pin so or an 8-pin tdfn package. these devices are specified over the -40? to +125? automotive tempera- ture range. applications sensor interfaces loop-powered systems industrial instrumentation high-voltage ate high-performance adc/dac input/output amplifiers features ? wide 6v to 38v supply range ? low 100? (max) input offset voltage ? low 0.4?/? offset drift ? unity gain stable with 1nf load capacitance ? 2.4mhz gain-bandwidth product ? 550? supply current ? 20ma output current ? package options 3mm x 5mm, 8-pin ?ax or 3mm x 3mm, 6-pin tdfn packages (single) 5mm x 6mm, 8-pin so or 3mm x 3mm, 8-pin tdfn packages (dual) MAX9943/max9944 high-voltage, precision, low-power op amps ________________________________________________________________ maxim integrated products 1 19-4433; rev 0; 3/09 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. 4 5 6 3 2 1 in+ out v ee in- v cc n.c. MAX9943 top view *ep top view 6 tdfn-ep *ep = exposed pad. package detail ordering information part temp range pin- package top mark MAX9943 aua+ -40? to +125? 8 ?ax aaca MAX9943att+ -40? to +125? 6 tdfn-ep* auf max9944 asa+** -40? to +125? 8 so max9944ata+** -40? to +125? 8 tdfn-ep* bln + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. ** future product?ontact factory for availability. MAX9943 toc17 r load ( ) c load (pf) 1000 10,000 1000 10,000 100,000 100 100 100,000 stable unstable capacitive load vs. resistive load ?ax is a registered trademark of maxim integrated products, inc. pin configurations appear at end of data sheet.
MAX9943/max9944 high-voltage, precision, low-power op amps 2 _______________________________________________________________________________________ absolute maximum ratings stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. supply voltage (v cc to v ee ) ..................................-0.3v to +40v all other pins (note 1) .....................(v ee - 0.3v) to (v cc + 0.3v) out short-circuit current duration 8-pin ?ax (v cc - v ee 20v)...............................................3s 8-pin ?ax (v cc - v ee > 20v) ................................momentary 6-pin tdfn (v cc - v ee 20v) .............................................60s 6-pin tdfn (v cc - v ee > 20v)...............................................2s continuous input current (any pins) ................................?0ma thermal limits (note 2) multiple layer pcb continuous power dissipation (t a = +70?) 8-pin ?ax (derate 4.8mw/? above +70?) ...........387.8mw ja .........................................................................206.3?/w jc ..............................................................................42?/w 6-pin tdfn-ep (derate 23.8mw/? above +70?) ..1904.8mw ja ..............................................................................42?/w jc ................................................................................9?/w 8-pin so (derate 7.6mw/? above +70?)...................606.1w ja ............................................................................132?/w jc ..............................................................................38?/w 8-pin tdfn-ep (derate 24.4mw/? above +70?) ..1951.2mw ja ..............................................................................41?/w jc ................................................................................8?/w operating temperature range .........................-40? to +125? junction temperature ......................................................+150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units dc characteristics operating supply voltage range v supply guaranteed by psrr test 3 19 v quiescent supply current per amplifier i cc 550 950 ? power-supply rejection ratio psrr v s = 3v to ?9v 105 130 db t a = +25 c 20 100 input offset voltage v os t a = -40 c to +125 c 240 ? input offset voltage drift tcv os 0.4 ?/ c v ee + 0.3v v cm v cc - 1.8v 2 10 input bias current i bias v ee v cm v cc - 1.8v 67 na v ee + 0.3v v cm v cc - 1.8v 1 5 input offset current i os v ee v cm v cc - 1.8v 5 na input voltage range v in+ , v in- guaranteed by cmrr test, t a = -40 c to +125 c v ee v cc - 1.8 v v ee + 0.3v v cm v cc - 1.8v 105 125 common-mode rejection ratio cmrr v ee v cm v cc - 1.8v 105 db electrical characteristics (v cc = 15v, v ee = -15v, v cm = 0, r l = 10k to gnd, gnd = 0, t a = -40? to +125?. typical values are at t a = +25?, unless oth- erwise noted.) (note 3) note 1: operation is limited by thermal limits. note 2: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial .
MAX9943/max9944 high-voltage, precision, low-power op amps _______________________________________________________________________________________ 3 parameter symbol conditions min typ max units -13.5v v o +13.5v, r l = 10k , t a = +25 c 115 130 -13.5v v o +13.5v, r l = 10k , t a = -40 c to +125 c 100 -12v v o +12v, r l = 600 , t a = +25 c 100 110 open-loop gain a vol -12v v o +12v, r l = 600 , t a = -40 c to +85 c 90 db r l = 10k v cc - 0.2 t a = +25 c v cc - 1.8 v oh r l = 600 t a = -40 c to +85 cv cc - 2 r l = 10k v ee + 0.1 t a = +25 c v ee + 1 output voltage swing v ol r l = 600 t a = -40 c to +85 c v ee + 1.1 v t a = +25 c60 short-circuit current i sc t a = -40 c to +125 c 100 ma ac characteristics gain bandwidth product gbwp 2.4 mhz slew rate sr -5v v out +5v 0.35 v/? input voltage noise density e n f = 1khz 17.6 nv/ hz input voltage noise total noise 0.1hz f 10hz 500 nv input current noise density i n f = 1khz 0.18 pa/ hz capacitive loading c load no sustained oscillation 1000 pf electrical characteristics (continued) (v cc = 15v, v ee = -15v, v cm = 0, r l = 10k to gnd, gnd = 0, t a = -40? to +125?. typical values are at t a = +25?, unless oth- erwise noted.) (note 3) note 3: all devices are 100% production tested at t a = +25?. temperature limits are guaranteed by design.
300 400 350 500 450 550 600 650 700 61418 10 22 26 30 34 38 supply current vs. supply voltage MAX9943 toc03 supply voltage (v) supply current ( a) 300 400 600 500 700 800 -50 0 -25 25 50 75 100 125 supply current vs. temperature MAX9943 toc04 temperature ( c) supply current ( a) 0 5 10 15 20 25 30 614 10 18 22 26 30 34 38 offset voltage vs. supply voltage MAX9943 toc05 supply voltage (v) offset voltage ( v) 0 10 5 20 15 25 30 -14 -2 2 -10 -6 6 10 14 offset voltage vs. common-mode voltage MAX9943 toc06 common-mode voltage (v) offset voltage ( v) -40 0 -20 40 20 80 60 100 -50 0 25 -25 50 75 100 125 offset voltage vs. temperature MAX9943 toc07 temperature ( c) offset voltage ( v) MAX9943/max9944 high-voltage, precision, low-power op amps 4 _______________________________________________________________________________________ typical operating characteristics (v cc = 15v, v ee = -15v, v cm = 0, r l = 10k to gnd, gnd = 0, t a = +25?, unless otherwise noted.) 0 5 10 15 20 25 -60 -40 -30 -50 -20 -10 0 20 10 30 40 50 60 offset voltage histogram MAX9943 toc01 offset voltage ( v) frequency (%) 0 20 10 40 30 60 50 70 -0.3 -0.2 -0.15 -0.1 -0.25 -0.05 0 0.05 0.1 0.15 0.2 0.25 0.3 input voltage offset drift histogram MAX9943 toc02 v os drift ( v/ c) frequency (%)
0 1.0 0.5 2.0 1.5 2.5 3.0 -14 -2 2 -10 -6 6 10 14 input bias current vs. common-mode voltage MAX9943 toc08 common-mode voltage (v) input bias current (na) common-mode rejection ratio vs. frequency MAX9943 toc10 frequency (khz) cmrr (db) 1000 100 0.01 0.1 1 10 70 80 90 100 110 120 130 140 60 0.001 10,000 v oh vs. output current MAX9943 toc12 010 51520 25 30 output voltage (v) 16 15 14 13 12 t a = +85 c t a = +25 c t a = -40 c output current (ma) t a = +125 c 0 0.5 1.0 1.5 2.0 2.5 3.0 614 10 18 22 26 30 34 38 input bias current vs. supply voltage MAX9943 toc09 supply voltage (v) input bias current (na) power-supply rejection ratio vs. frequency MAX9943 toc11 frequency (khz) psrr (db) 1000 100 0.01 0.1 1 10 20 40 60 80 100 120 140 160 0 0.001 10,000 v ol vs. output current MAX9943 toc13 output voltage (v) 010 51520 25 30 -16 -15 -14 -13 -12 t a = +85 c t a = +125 c t a = -40 c t a = +25 c output current (ma) MAX9943/max9944 high-voltage, precision, low-power op amps _______________________________________________________________________________________ 5 typical operating characteristics (continued) (v cc = 15v, v ee = -15v, v cm = 0, r l = 10k to gnd, gnd = 0, t a = +25?, unless otherwise noted.)
MAX9943/max9944 high-voltage, precision, low-power op amps 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = 15v, v ee = -15v, v cm = 0, r l = 10k to gnd, gnd = 0, t a = +25?, unless otherwise noted.) output impedance vs. frequency MAX9943 toc14 frequency (khz) output impedance ( ) 1000 100 10 1 0.1 1 10 100 1000 0.01 0.1 10,000 input voltage noise vs. frequency MAX9943 toc15 frequency (hz) 10,000 1000 100 10 10 20 30 40 50 60 70 80 90 100 0 1 100,000 input voltage noise (nv/ hz) capacitive load vs. resistive load MAX9943 toc17 r load ( ) c load (pf) 1000 10,000 1000 10,000 100,000 100 100 100,000 stable unstable open-loop gain vs. frequency MAX9943 toc16 frequency (khz) open-loop gain (db) 100 10 0.0001 0.001 0.01 0.1 1 0 20 40 60 80 100 120 140 -20 0.00001 1000 10,000 1 s/div small signal-step response 20mv/div MAX9943 toc18 out 10 s/div large signal-step response 1v/div MAX9943 toc19 out
detailed description the MAX9943/max9944 are single/dual operational amplifiers designed for industrial applications. they operate from 6v to 38v supply range while maintaining excellent performance. these devices utilize a three- stage architecture optimized for low offset voltage and low input noise with only 550? supply current. the devices are unity gain stable with a 1nf capacitive load. these well-matched devices guarantee the high open-loop gain, cmrr, psrr, and low voltage offset. the MAX9943/max9944 provide a wide input/output voltage range. the input terminals of the MAX9943/ max9944 are protected from excessive differential volt- age with back-to-back diodes. the input signal current is also limited by an internal series resistor. with a 40v differential voltage, the input current is limited to 20ma. the output can swing to the negative rail while deliver- ing 20ma of current, which is ideal for loop-powered system applications. the specifications and operation of the MAX9943/max9944 family is guaranteed over the -40? to +125? temperature range. application information bias current vs. input common mode the MAX9943/max9944 use an internal bias current cancellation circuit to achieve very low bias current over a wide input common-mode range. for such a cir- cuit to function properly, the input common mode must be at least 300mv away from the negative supply v ee . the input common mode can reach the negative sup- ply v ee . however, in the region between v ee and v ee + 0.3v, there is an increase in bias current for both inputs. capacitive load stability driving large capacitive loads can cause instability in many op amps. the MAX9943/max9944 are stable with capacitive loads up to 1nf. the capacitive load vs. resistive load graph in the typical operating characteristics gives the stable operation region for capacitive versus resistive loads. stability with higher capacitive loads can be improved by adding an isola- tion resistor in series with the op-amp output, as shown in figure 1. this resistor improves the circuit? phase MAX9943/max9944 high-voltage, precision, low-power op amps _______________________________________________________________________________________ 7 pin description MAX9943 6 tdfn-ep MAX9943 8 ?ax max9944 8 so/tdfn-ep name function 1 6 out output 1 outa output a 7 outb output b 24 4 v ee negative power supply. bypass with a 0.1? capacitor to ground. 3 3 in+ positive input 3 ina+ positive input a 5 inb+ positive input b 4 2 in- negative input 2 ina- negative input a 6 inb- negative input b 5 1, 5, 8 n.c. no connection 67 8 v cc positive power supply. bypass with a 0.1? capacitor to ground. ep exposed pad (tdfn only). connect to a large ground plane to maximize thermal performance. not intended as an electrical connection point.
MAX9943/max9944 margin by isolating the load capacitor from the amplifi- er? output. power supplies and layout the MAX9943/max9944 can operate with dual supplies from ?v to ?9v or with a single supply from +6v to +38v with respect to ground. when used with dual sup- plies, bypass both v cc and v ee with their own 0.1? capacitor to ground. when used with a single supply, bypass v cc with a 0.1? capacitor to ground. careful layout technique helps optimize performance by decreasing the amount of stray capacitance at the op amp? inputs and outputs. to decrease stray capaci- tance, minimize trace lengths by placing external com- ponents close to the op amp? pins. output current capability the MAX9943/max9944 are capable of driving heavy loads such as the ones that can be found in loop-pow- ered systems for remote sensors. the information is transmitted through ?0ma or 4ma?0ma current output across long lines that are terminated with low resistance loads (e.g., 600 ). the typical application circuit shows the max9944 used as a voltage-to-current converter with a current-sense amplifier in the feedback loop. because of the high output current capability of the max9944, the device can be used to directly drive the current-loop. the specifications and operation of the MAX9943/ max9944 family is guaranteed over the -40? to +125? temperature range, however, when used in applications with ?5v supply voltage (see figure 3), the capability of driving more than ?0ma of current is limited to the -40? to +85? temperature range. use a lower supply voltage if this current must be delivered at a higher temperature range. input common mode and output swing the MAX9943/max9944 input common-mode range can swing to the negative rail v ee . the output voltage can also swing to the negative rail v ee if the output stage is not heavily loaded. these two features are very important for applications where the MAX9943/ max9944 are used with a single-supply (v ee connect- ed to ground). one of the applications that can benefit from these features is when the single-supply op amp is driving an adc. input differential voltage protection during normal op-amp operation, the inverting and non- inverting inputs of the MAX9943/max9944 are at essen- tially the same voltage. however, either due to fast input voltage transients or due to other fault conditions, these pins can be forced to be at two different voltages. internal back-to-back diodes and series resistors pro- tect the inputs from an excessive differential voltage (see figure 2). therefore, in+ and in- can be any volt- age within the range shown in the absolute maximum rating. note the protection time is still dependent on the package thermal limits. chip information process: bicmos high-voltage, precision, low-power op amps 8 _______________________________________________________________________________________ r iso input output c l MAX9943 figure 1. capacitive load driving circuit 1.5k 1.5k figure 2. input protection circuit
MAX9943/max9944 high-voltage, precision, low-power op amps _______________________________________________________________________________________ 9 -15v r sense r load v ref -15v +15v dac max9944 figure 3. typical ?0ma current-source in loop-powered systems
MAX9943/max9944 high-voltage, precision, low-power op amps 10 ______________________________________________________________________________________ MAX9943 top view 8 max 4 5 6 3 2 1 in+ out v ee in- v cc n.c. MAX9943 top view *ep top view 6 tdfn out n.c. 8 7 n.c. v cc 6 5 v ee 1 2 in- in+ n.c. 3 4 max9944 8 so outb inb+ 8 7 inb- v cc 6 5 v ee 1 2 ina- ina+ outa 3 4 max9944 outb inb+ 8 7 inb- v cc 6 5 v ee 1 2 ina- ina+ outa 3 4 top view 8 tdfn *ep not to scale. *ep = exposed pad. + + + pin configurations
MAX9943/max9944 package type package code document no. 8 ?ax u8+1 21-0036 6 tdfn-ep t633+2 21-0137 8 so s8+4 21-0041 8 tdfn-ep t833+2 21-0137 package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . 8lumaxd.eps high-voltage, precision, low-power op amps ______________________________________________________________________________________ 11
MAX9943/max9944 high-voltage, precision, low-power op amps 12 ______________________________________________________________________________________ package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . 6, 8, &10l, dfn thin.eps
MAX9943/max9944 high-voltage, precision, low-power op amps ______________________________________________________________________________________ 13 package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref 2.300.10 mo229 / weed-3 2.00 ref 0.250.05 0.50 bsc 1.500.10 10 t1033-2
MAX9943/max9944 high-voltage, precision, low-power op amps 14 ______________________________________________________________________________________ package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . soicn .eps package outline, .150" soic 1 1 21-0041 b rev. document control no. approval proprietary information title: top view front view max 0.010 0.069 0.019 0.157 0.010 inches 0.150 0.007 e c dim 0.014 0.004 b a1 min 0.053 a 0.19 3.80 4.00 0.25 millimeters 0.10 0.35 1.35 min 0.49 0.25 max 1.75 0.050 0.016 l 0.40 1.27 0.394 0.386 d d min dim d inches max 9.80 10.00 millimeters min max 16 ac 0.337 0.344 ab 8.75 8.55 14 0.189 0.197 aa 5.00 4.80 8 n ms012 n side view h 0.244 0.228 5.80 6.20 e 0.050 bsc 1.27 bsc c h e e b a1 a d 0 -8 l 1 variations:
MAX9943/max9944 high-voltage, precision, low-power op amps ______________________________________________________________________________________ 15 package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . 6, 8, &10l, dfn thin.eps
package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . common dimensions symbol min. max. a 0.70 0.80 d 2.90 3.10 e 2.90 3.10 a1 0.00 0.05 l 0.20 0.40 pkg. code n d2 e2 e jedec spec b [(n/2)-1] x e package variations 0.25 min. k a2 0.20 ref. 2.00 ref 0.250.05 0.50 bsc 2.300.10 10 t1033-1 2.40 ref 0.200.05 - - - - 0.40 bsc 1.700.10 2.300.10 14 t1433-1 1.500.10 mo229 / weed-3 0.40 bsc - - - - 0.200.05 2.40 ref t1433-2 14 2.300.10 1.700.10 t633-2 6 1.500.10 2.300.10 0.95 bsc mo229 / weea 0.400.05 1.90 ref t833-2 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref t833-3 8 1.500.10 2.300.10 0.65 bsc mo229 / weec 0.300.05 1.95 ref 2.300.10 mo229 / weed-3 2.00 ref 0.250.05 0.50 bsc 1.500.10 10 t1033-2 high-voltage, precision, low-power op amps MAX9943/max9944 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc.

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