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ina156 ? 1999 burr-brown corporation pds-1565a printed in u.s.a. december, 1999 features l rail-to-rail output swing: within 20mv l low offset drift: 5 m v/ c l internal fixed gain = 10v/v or 50v/v l specified temperature range: C55 c to +125 c l low input bias current: 1pa l wide bandwidth: 550khz in g = 10 l high slew rate: 6.5v/ m s l low cost l tiny msop-8 packages single-supply, rail-to-rail output, cmos instrumentation amplifier description the ina156 is a low-cost cmos instrumentation amplifier with rail-to-rail output swing optimized for low-voltage, single-supply operation. wide bandwidth (550khz in g = 10) and high slew rate (6.5v/ m s) make the ina156 suitable for driving sampling a/d converters as well as general purpose and audio applications. fast settling time allows use with higher speed sensors and transducers, and rapid scanning data acquisition systems. applications l industrial sensor amplifiers: bridge, rtd, thermocouple, flow, position l medical equipment: ecg, eeg, emg amplifiers l driving a/d converters l pcmcia cards l audio processing l communications l test equipment l low cost automotive instrumentation international airport industrial park ? mailing address: po box 11400, tucson, az 85734 ? street address: 6730 s. tucson bl vd., tucson, az 85706 ? tel: (520) 746-1111 twx: 910-952-1111 ? internet: http://www.burr-brown.com/ ? cable: bbrcorp ? telex: 066-6491 ? fax: (520) 889-1510 ? i mmediate product info: (800) 548-6132 for most current data sheet and other product information, visit www.burr-brown.com gain can be set to 10v/v or 50v/v by pin strapping. gains between these two values can be obtained with the addition of a single resistor. the ina156 is fully specified over the supply range of +2.7v to +5.5v. the ina156 is available in an msop-8 surface-mount package specified for operation over the temperature range C55 c to 125 c. 22.2k w 200k w v in v in + ref r g ina156 v o 22.2k w 5k w 5k w 200k w r g v+ v 1 5 2 3 8 7 4 6 a1 a2 g = 10 pins open g = 50 pins connected v o = (v in ?v in ) ?g + v ref + ina156 sbos119
2 ina156 specifications: v s = +2.7v to +5.5v boldface limits apply over the specified temperature range, t a = C55 c to +125 c at t a = +25 c, r l = 10k w connected to v s /2. r g pins open (g = 10), and ref = v s /2, unless otherwise noted. ina156e, a parameter condition min typ max units input offset voltage, rti v os v s = +5.0v, v cm = v s /2 2.5 8mv over temperature 9 mv drift dv os /d t 5 m v/ c vs power supply psrr v s = +2.7v to +6v, v cm = 0.2 ? v s 50 200 m v/ v over temperature 250 m v/v vs time 0.4 m v/mo input voltage range safe input voltage (vC) C 0.5 (v+) + 0.5 v common-mode range (1) v cm v s = 5.5v 0.3 5.2 (2) v v s = 2.7v 0.2 2.5 (2) v common-mode rejection ratio cmrr v s = 5.5v, 0.6v < v cm < 3.7v, g = 10 66 78 db over temperature 65 db v s = 5.5v, 0.6v < v cm < 3.7v, g = 50 74 87 db over temperature 73 db input impedance differential 10 13 || 3 w || pf common-mode 10 13 || 3 w || pf input bias current input bias current i b 1 10 pa offset current i os 1 10 pa noise, rti r s = 0 w , g = 10 or 50 voltage noise: f = 0.1hz to 10hz 4.5 m v/vp-p voltage noise density: f = 10hz 260 nv/ ? hz f = 100hz 99 nv/ ? hz f = 1khz 40 nv/ ? hz current noise: f = 1khz 2 fa/ ? hz gain 10 50 v/v gain equation g = 10 + 400k w /(10k w + r g ) v/v gain error (3) v s = 5.5v, v o = 0.02v to 5.48v, g = 10 0.08 0.4 % vs temperature 2 10 ppm/ c v s = 5.5v, v o = 0.05v to 5.45v, g = 50 0.1 0.8 % vs temperature 15 30 ppm/ c nonlinearity v s = 5.5v, g = 10 or 50 0.005 0.015 % of fsr over temperature 0.015 % of fsr output voltage output swing from rail g = 10, r l = 10k w , g err < 0.4% 5 20 mv over temperature 20 mv short-circuit current short-circuit to ground 50 ma capacitance load (stable operation) see typical curve frequency response bandwidth, C3db bw g = 10 550 khz g = 50 110 khz slew rate sr v s = 5.5v, c l = 100pf 6.5 v/ m s settling time: 0.1% t s v s = 5.5v, v o = 2v step, c l = 100pf, g = 10 5 m s v s = 5.5v, v o = 2v step, c l = 100pf, g = 50 11 m s 0.01% v s = 5.5v, v o = 2v step, c l = 100pf, g = 10 8 m s v s = 5.5v, v o = 2v step, c l = 100pf, g = 50 15 m s overload recovery 50% input overload 0.2 m s total harmonic distortion + noise thd+n see typical curve power supply specified voltage range +2.7 +5.5 v operating voltage range +2.5 to +6 v quiescent current v in = 0, i o = 0 1.8 2.5 ma over temperature v in = 0, i o = 0 3.2 ma temperature range specified range C55 +125 c operating range C65 +150 c storage range C65 +150 c thermal resistance q ja msop-8 surface mount 150 c/w so-8 surface mount 150 c/w notes: (1) for further information, refer to typical performance curves on common-mode input range. (2) operation beyond (v+) C 1.8v (max) results in reduced common-mode rejection. see discussion and figure 6 in the text of this data sheet. (3) does not include error and tcr of additional optiona l gain-setting resistor in series with r g , if used.
3 ina156 pin configuration electrostatic discharge sensitivity this integrated circuit can be damaged by esd. burr-brown recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. the information provided herein is believed to be reliable; however, burr-brown assumes no responsibility for inaccuracies or o missions. burr-brown assumes no responsibility for the use of this information, and all use of such information shall be entirely at the users own risk. pr ices and specifications are subject to change without notice. no patent rights or licenses to any of the circuits described herein are implied or granted to any third party. burr-brown does not authorize or warrant any burr-brown product for use in life support devices and/or systems. top view msop supply voltage, v+ to vC ................................................................... 7.5v signal input terminals, voltage (2) .................. (vC) C 0.5v to (v+) + 0.5v current (2) .................................................... 10ma output short-circuit (3) .............................................................. continuous operating temperature .................................................. C65 c to +150 c storage temperature ..................................................... C65 c to +150 c junction temperature .................................................................... +150 c lead temperature (soldering, 10s) ............................................... +300 c notes: (1) stresses above these ratings may cause permanent damage. exposure to absolute maximum conditions for extended periods may degrade device reliability. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied. (2) input terminals are diode-clamped to the power supply rails. input signals that can swing more that 0.5v beyond the supply rails should be current limited to 10ma or less. (3) short circuit to ground. absolute maximum ratings (1) package specified drawing temperature package ordering transport product package number range marking number (1) media ina156 ea msop-8 337 C55 c to +125 c a56 ina156ea/250 tape and reel """"" ina156ea/2k5 tape and reel note: (1) models with a slash (/) are available only in tape and reel in the quantities indicated (e.g., /2k5 indicates 2500 de vices per reel). ordering 2500 pieces of ina156ea/2k5 will get a single 2500-piece tape and reel. package/ordering information r g v in v in v r g v+ v out ref 1 2 3 4 8 7 6 5 ina156 +
4 ina156 typical performance curves at t a = +25 c, v s = 5.5v, r l = 10k w connected to v s /2. r g pins open (g = 10), and ref = v s /2, unless otherwise noted. gain vs frequency frequency (hz) gain (db) 1 100 10 1k 10k 1m 10m 40 35 30 25 20 15 10 5 0 100k g = 50 g =10 common-mode rejection ratio vs frequency frequency (hz) cmrr (db) 0.1 1 10 10k 100k 100 90 80 70 60 50 40 30 20 10 0 100 1k g = 50 g = 10 power supply rejection ratio vs frequency frequency (hz) psrr (db) 1 10 10k 100k 1m 100 90 80 70 60 50 40 30 20 10 0 100 1k maximum output voltage vs frequency frequency (hz) maximum output voltage (vp-p) 1 10 10k 100k 1m 6 5 4 3 2 1 0 100 1k v s = 5.5v short-circuit current and quiescent current vs power supply supply voltage (v) i sc (ma) 2.5 3 4.0 3.5 55 50 45 40 35 30 25 i q (ma) 2.1 2.0 1.9 1.8 1.7 1.6 1.5 4.5 5.5 6 5 i q +i sc ? sc quiescent current and short-circuit current vs temperature temperature ( c) i q (ma) i sc (ma) 75 ?0 0 ?5 2.5 2.0 1.5 1.0 0.5 0 100 80 60 40 20 0 25 100 125 150 50 75 i q +i sc ? sc
5 ina156 typical performance curves (cont.) at t a = +25 c, v s = 5.5v, r l = 10k w connected to v s /2. r g pins open (g = 10), and ref = v s /2, unless otherwise noted. 0.1hz to 10hz voltage noise 500ms/div 1 m v/div input-referred input voltage and current noise density vs frequency frequency (hz) voltage noise (nv/ ? hz) 0.1 1 10 10k 1k 100 10 100 10 1 0.1 100 100k 1k 10k current noise (fa/ ? hz) e n i n total harmonic distortion + noise vs frequency 1 0.1 0.01 0.001 thd+n (%) 10 100 10k 1k frequency (hz) r l = 600 w r l = 600 w r l = 10k w r l = 2k w g = 50 g = 10 r l =10k w r l = 2k w slew rate vs temperature temperature ( c) slew rate (v/ s) 75 ?0 0 ?5 10 9 8 7 6 5 4 3 2 1 0 25 100 125 150 50 75 slew rate vs power supply supply voltage (v) slew rate (v s) 2.5 3 4 3.5 7 6.5 6 5.5 5 4.5 4 4.5 6 5 5.5 input bias current vs temperature temperature ( c) input bias current (pa) ?5 ?0 ?5 0 10k 1k 100 10 1 0.1 25 100 125 150 50 75
6 ina156 typical performance curves (cont.) at t a = +25 c, v s = 5.5v, r l = 10k w connected to v s /2. r g pins open (g = 10), and ref = v s /2, unless otherwise noted. 5 m s/div 100mv/div small-signal step response g = 10, c l = 100pf, r l = 10k w 5 m s/div 100mv/div small-signal step response g = 50, c l = 100pf, r l = 10k w overshoot vs load capacitance load capacitance (pf) overshoot (%) 10 100 10k 60 50 40 30 20 10 0 1k g = 10 g = 50 settling time vs load capacitance load capacitance (pf) settling time ( s) 10 100 10k 20 18 16 14 12 10 8 6 4 2 0 1k 0.01%, g = 50 0.1%, g = 50 0.01%, g = 10 0.1%, g = 10 v os typical production distribution production distribution (%) offset voltage (mv) ?0 ? ? ? ? 0 2 4 6 8 10 18 16 14 12 10 8 6 4 2 0 offset voltage drift production distribution percent of amplifiers (%) offset voltage drift ( v/ c) ?0 ?8 ?6 ?4 ?2 ?0 ? ? ? ? 0 2 4 6 8 10 12 14 16 18 20 18 16 14 12 10 8 6 4 2 0
7 ina156 typical performance curves (cont.) at t a = +25 c, v s = 5.5v, r l = 10k w connected to v s /2. r g pins open (g = 10), and ref = v s /2, unless otherwise noted. 1 m s/div 1v/div large-signal step response g = 10, g = 50, c l = 100pf, r l = 10k w input common-mode range vs output voltage, g = 50 v out (v) v cm (v) 0 0.5 1 2 1.5 6 5 4 3 2 1 0 2.5 5.5 3 3.5 4 4.5 5 ref = 0v ref = 2.75v ref = 5.5v g = 50 0.9v + 0.04v out + 0.06ref < v cm < 0.9v + + 0.04v out + 0.06ref input common-mode range vs reference voltage, g = 10 v ref (v) v cm (v) 0 0.5 1 2 1.5 6 5 4 3 2 1 0 2.5 5.5 3 3.5 4 4.5 5 g = 10 0.9v + 0.1ref < v cm < 0.9v + + 0.1ref common-mode rejection ratio production distribution production distribution (%) cmrr ( v/v) g = 10 80db ?00 ?50 ?00 ?50 ?00 ?50 ?00 ?50 ?00 ?0 0 50 100 150 200 250 300 350 400 450 500 9 8 7 6 5 4 3 2 1 0 common-mode rejection ratio production distribution production distribution (%) cmrr ( v/v) g = 50 ?00 ?80 ?60 ?40 ?20 ?00 ?0 ?0 ?0 ?0 0 20 40 60 80 100 120 140 160 180 200 10 9 8 7 6 5 4 3 2 1 0 80db output voltage swing vs output current output current (ma) output voltage (v) 5 4 3 2 1 0 0 10203040 5060 708090100 +125 c +25 c ?5 c +125 c +25 c ?5 c
8 ina156 applications information figure 1 shows the basic connections required for operation of the ina156. applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins, as shown. the output is referred to the output reference terminal, ref, which is normally set to v s /2. this must be a low-imped- ance connection to ensure good common-mode rejection. in addition, for the g = 50 configuration, the connection between pins 1 and 8 must be low-impedance. a connection impedance of 20 w can cause a 0.2% shift in gain error. operating voltage the ina156 is fully specified and guaranteed over the supply range +2.7v to +5.5v, with key parameters guaranteed over the temperature range of C55 c to +125 c. parameters that vary significantly with operating voltages, load conditions or temperature are shown in the typical performance curves. the ina156 can be operated from either single or dual power supplies. by adjusting the voltage applied to the reference terminal, the input common-mode voltage range and the output range can be adjusted within the bounds shown in the typical performance curves. figure 2 shows a bridge amplifier circuit operated from a single +5v power supply. the bridge provides a relatively small differential voltage on top of an input common-mode voltage near 2.5v. figure 1. basic connections. figure 2. single-supply bridge amplifier. ref 22.2k w 200k w 5k w gain pins open: g = 10 external resistor r g : 10 < g < 50 gain pins connected: g = 50 5k w 200k w 22.2k w 4 3 2 5 7 18 v 0.1 f single supply also drawn in simplified form: dual supply ina156 ina156 6 1 3 8 2 v out 6 7 4 5 ref 0.1 f v+ v+ v desired gain r g (v/v) ( w ) 10 open 20 30k 30 10k 40 3.3k 50 short g = 10 + 400k w 10k w + r g v in v in + a1 a2 v in + v in v out = (v in ?v in ) ?g + v ref + bridge sensor ina156 v ref (1) +5v 3 2 4 5 7 6 v out = 0.01v to 4.99v (2) notes: (1) v ref should be adjusted for the desired output level, keeping in mind that the value of v ref affects the common-mode input range. see typical performance curves. (2) for best performance, the common-mode input voltage should be kept away from the transition range of (v+) ?1.8v to (v+) ?0.8v. 1 8 v in + v in
9 ina156 setting the gain gain of 10 is achieved simply by leaving the two gain pins (1 and 8) open. gain of 50 is achieved by connecting the gain pins together directly. in the g = 10 configuration, the gain error is less than 0.4%. in the g = 50 configuration, the gain error is less than 0.8%. gain can be set to any value between 10 and 50 by connect- ing a resistor r g between the gain pins according to the following equation: 10 + 400k w /(10k w + r g ) (1) this is demonstrated in figure 1 and is shown with the com- monly used gains and resistor r g values. however, because the absolute value of internal resistors is not guaranteed, using the ina156 in this configuration will increase the gain error and gain drift with temperature, as shown in figure 3. figure 3. typical gain error and gain error drift with external resistor. offset trimming offset voltage can be adjusted by applying a correction voltage to the reference terminal. figure 4 shows an optional circuit for trimming the output offset voltage. the voltage applied to the ref terminal is added to the output signal. an op amp buffer is used to provide low impedance at the ref terminal to preserve good common-mode rejection. input bias current return the input impedance of the ina156 is extremely high approximately 10 13 w , making it ideal for use with high-imped- ance sources. however, a path must be provided for the input bias current of both inputs. this input bias current is less than 10pa and is virtually independent of the input voltage. input circuitry must provide a path for this input bias current for proper operation. figure 5 shows various provisions for an input bias current path. without a bias current path, the inputs will float to a potential that exceeds the common- mode range and the input amplifier will saturate. if the differential source resistance is low, the bias current return path can be connected to one input (see the thermo- couple in figure 5). with higher source impedance, using two equal resistors provides a balanced input with advan- tages of lower input offset voltage due to bias current and better high-frequency common-mode rejection. figure 4. optional trimming of output offset voltage. figure 5. providing an input common-mode current path. gain (v/v) gain error (%) 10 15 20 30 25 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 gain drift (ppm/ c) 400 360 320 280 250 200 160 120 80 40 0 35 40 50 45 gain drift gain error opa336 ina156 ref (1) 3 6 2 5 v o adjustable voltage v in + (2) v in (2) notes: (1) v ref should be adjusted for the desired output level. the value of v ref affects the common-mode input range. (2) for best performance, common-mode input voltage should be less than (v+) ?1.8v or greater than (v+) ?0.8v. 1 8 ina156 3 6 6 6 6 2 47k w 5 v ref 47k w microphone, hydrophone, etc. ina156 3 2 3 2 5 v ref center-tap provides bias current return low-resistance thermocouple provides bias current return. bridge resistance provides bias current return ina156 3 2 10k w 5 v ref thermocouple ina156 5 v ref bridge sensor 1 8 1 8 1 8 1 8
10 ina156 figure 6. input offset voltage changes with common- mode voltage. figure 7. single-supply, high-side current monitor. figure 8. input current protection for voltages exceed- ing the supply voltage. figure 9. driving capacitive-input a/d converter. input common-mode range the input common-mode range of the ina156 for various operating conditions is shown in the typical performance curves. the common-mode input range is limited by the output voltage swing of a1, an internal circuit node. for the g = 10 configuration, output voltage of a1 can be expressed as : v outa1 = C 1 / 9 v ref + (1 + 1 / 9 ) v in C (2) the input common-mode voltage range can be calculated using this equation, given that the output of a1 can swing to within 20mv of either rail. when the input common-mode range is exceeded (a1s output is saturated), a2 can still be in linear operation and respond to changes in the non-inverting input voltage. however, the output voltage will be invalid. the common-mode range for the g = 50 configuration is included in the typical performance curve, input common- mode range vs output voltage. input range for best accuracy the internal amplifiers have rail-to-rail input stages, achieved by using complementary n-channel and p-channel input pairs. the common-mode input voltage determines whether the p-channel or the n-channel input stage is operating. the transition between the input stages is gradual and occurs between (v+) C 1.8v to (v+) C 1v. due to these character- istics, operating the ina156 with input voltages within the transition region of (v+) C 1.8v to (v+) C 0.8v results in a shift in input offset voltage, and reduced common-mode and power supply rejection performance. typical patterns of the offset voltage change throughout the input common-mode range are illustrated in figure 6. the ina156 can be operated below or above the transition region with excellent results. figure 7 demonstrates the use of the ina156 in a single-supply, high-side current monitor. in this application, the ina156 is operated above the transition region. rail-to-rail output a class ab output stage with common-source transistors is used to achieve rail-to-rail output. for resistive loads greater than 10k w , the output voltage can swing to within a few millivolts of the supply rail while maintaining low gain error. for heavier loads and over temperature, see the typical performance curve output voltage swing vs out- put current. the ina156s low output impedance at high frequencies makes it suitable for directly driving capaci- tive digital-to-analog (cdac) input a/d converters, as shown in figure 9. input protection device inputs are protected by esd diodes that will conduct if the input voltages exceed the power supplies by more than 500mv. momentary voltages greater than 500mv beyond the power supply can be tolerated if the current on the input pins is limited to 10ma. this is easily accomplished with input resistors r lim , as shown in figure 8. many input signals are inherently current-limited to less than 10ma. therefore, a limiting resistor is not required. ina156 7 6 4 5 ref i l 2.5a g = 10 pins 1 and 8 open v+ note: output is referred to v+. 2 3 1 8 0.02 w load 50mv +5v ina156 ads7818 or ads7834 12-bits f sample = 500khz 6 7 4 5 3 2 note: g = 10 configuration 1 8 ina156 5 v out v ref r lim r lim i overload 10ma max 3 6 2 1 8 input common-mode voltage (v) input offset voltage (mv) 0.0 0.5 1.0 2.5 3.0 1.5 2.0 5 4 3 2 1 0 ? ? ? ? ? 3.5 4.0 4.5 5.5 5.0 v s = 5.5v p-channel operation transistion region n-channel operation
important notice texas instruments and its subsidiaries (ti) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. ti warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with ti's standard warranty. testing and other quality control techniques are utilized to the extent ti deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. customers are responsible for their applications using ti components. in order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. ti assumes no liability for applications assistance or customer product design. ti does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ti covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. ti's publication of information regarding any third party's products or services does not constitute ti's approval, warranty or endorsement thereof. copyright ? 2000, texas instruments incorporated

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