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xr1008, xr2008 0.5ma, 75mhz rail-to-rail amplifiers ? 2014 exar corporation 1 / 17 exar.com/xr1008 rev 1b general description the xr1008 (single) and xr2008 (dual) are rail-to-rail output ampliers that offer superior dynamic performance with 75mhz small signal bandwidth and 50v/s slew rate. the xr1008 and xr2008 ampliers consume only 505a of supply current per channel and are designed to operate from a supply range of 2.5v to 5.5v (1.25 to 2.75). the combination of low power, high output current drive, and rail-to-rail performance make the xr1008 and xr2008 well suited for battery-powered metering and test equipment. the combination of low cost and high performance make these ampliers suitable for high volume industrial applications such as ultrasonic heat meters, water meters and other applications requiring high speed and low power. typical application + - r g 0.1f 6.8f out in +2.7 + r f r in r out xr1008 frequency response vs. temperature magnitude (1db/div) frequency (mhz) 0.01 1 100 10 0.1 fe atu r e s 505a supply current 75mhz bandwidth input voltage range with 5v supply: -0.3v to 3.8v output voltage range with 5v supply: 0.07v to 4.86v 50v/s slew rate 12nv/hz input voltage noise 15ma linear output current fully specified at 2.7v and 5v supplies a p p li cati o n s portable/battery-powered applications mobile communications, cell phones, pagers adc buffer active lters portable test instruments signal conditioning medical equipment portable medical instrumentation flow meters ordering information - back page
? 2014 exar corporation 2 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 absolute maximum ratings stresses beyond the limits listed below may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. v s ..................................................................................... 0v to 6v v in ............................................................ -v s - 0.5v to +v s +0.5v continuous output current ..................................-30ma to +30ma operating conditions supply voltage range ...................................................2.5 to 5.5v operating temperature range ...............................-40c to 125c junction temperature ........................................................... 150c storage temperature range ...................................-65c to 150c lead temperature (soldering, 10s) ......................................260c package thermal resistance ja (tsot-5) .....................................................................215c/w ja (soic-8) .....................................................................150c/w ja (msop-8) .................................................................. 200c/w package thermal resistance ( ja ), jedec standard, multi-layer test boards, still air. esd protection xr1008 (hbm) .........................................................................2kv xr2008 (hbm) ......................................................................2.5kv esd rating for hbm (human body model).
? 2014 exar corporation 3 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 electrical characteristics at +2.7v t a = 25c, v s = +2.7v, r f = r g = 1k, r l = 1k to v s /2; g = 2; unless otherwise noted. symbol parameter conditions min typ max units frequency domain response ugbw ss unity gain -3db bandwidth g = +1, v out = 0.05v pp , r f = 0 65 mhz bw ss -3db bandwidth g = +2, v out < 0.2v pp 30 mhz bw ls large signal bandwidth g = +2, v out = 2v pp 12 mhz gbwp gain bandwidth product g = +11, v out = 0.2v pp 28 mhz time domain response t r , t f rise and fall time v out = 0.2v step; (10% to 90%) 7.5 ns t s settling time to 0.1% v out = 1v step 60 ns os overshoot v out = 1v step 10 % sr slew rate g = -1, 2v step 40 v/s distortion/noise response hd2 2nd harmonic distortion 1mhz, v out = 1v pp -67 dbc hd3 3rd harmonic distortion 1mhz, v out = 1v pp -72 dbc thd total harmonic distortion 1mhz, v out = 1v pp 65 db e n input voltage noise >10khz 12 nv/hz dc performance v io input offset voltage 0 mv d vio average drift 10 v/c i b input bias current 1.2 a di b average drift 3.5 na/c i os input offset current 30 na psrr power supply rejection ratio dc 60 66 db a ol open loop gain v out = v s / 2 98 db i s supply current per channel 470 a input characteristics r in input resistance non-inverting 9 m c in input capacitance 1.5 pf cmir common mode input range -0.3 to 1.5 v cmrr common mode rejection ratio dc, v cm = 0v to v s - 1.5v 74 db output characteristics v out output voltage swing r l = 1k to v s / 2 0.09 to 2.53 v r l = 10k to v s / 2 0.05 to 2.6 v i out output current 15 ma i sc short circuit current 30 ma
? 2014 exar corporation 4 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 electrical characteristics at +5v t a = 25c, v s = +5v, r f = r g = 1k, r l = 1k to v s /2; g = 2; unless otherwise noted. symbol parameter conditions min typ max units frequency domain response ugbw ss unity gain -3db bandwidth g = +1, v out = 0.05v pp , r f = 0 75 mhz bw ss -3db bandwidth g = +2, v out < 0.2v pp 35 mhz bw ls large signal bandwidth g = +2, v out = 2v pp 15 mhz gbwp gain bandwidth product g = +11, v out = 0.2v pp 33 mhz time domain response t r , t f rise and fall time v out = 0.2v step; (10% to 90%) 6 ns t s settling time to 0.1% v out = 1v step 60 ns os overshoot v out = 1v step 12 % sr slew rate g = -1, 2v step 50 v/s distortion/noise response hd2 2nd harmonic distortion 1mhz, v out = 2v pp -64 dbc hd3 3rd harmonic distortion 1mhz, v out = 2v pp -62 dbc thd total harmonic distortion 1mhz, v out = 2v pp 60 db e n input voltage noise >10khz 12 nv/hz dc performance v io input offset voltage -5 -1 5 mv d vio average drift 10 v/c i b input bias current -3.5 1.2 3.5 a di b average drift 3.5 na/c i os input offset current 30 350 na psrr power supply rejection ratio dc 60 66 db a ol open loop gain v out = v s / 2 65 80 db i s supply current per channel 505 620 a input characteristics r in input resistance non-inverting 9 m c in input capacitance 1.5 pf cmir common mode input range -0.3 to 3.8 v cmrr common mode rejection ratio dc, v cm = 0v to v s - 1.5v 65 74 db output characteristics v out output voltage swing r l = 1k to v s / 2 0.2 to 4.65 0.13 to 4.73 v r l = 10k to v s / 2 0.08 to 4.84 v i out output current 15 ma i sc short circuit current 30 ma
? 2014 exar corporation 5 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 soic-8 pin no. pin name description 1 nc no connect 2 -in negative input 3 +in positive input 4 -v s negative supply 5 nc no connect 6 out output 7 +v s positive supply 8 nc no connect soic-8 - + 12 3 4 nc -in +in -v s nc +v s out nc 87 6 5 xr1008 pin assignments tsot-5 pin no. pin name description 1 out output 2 -v s negative supply 3 +in positive input 4 -in negative input 5 +v s positive supply xr1008 pin congurations tsot-5 - + 23 54 +in + v s -in 1 - v s out xr2008 pin assignments soic-8 / msop-8 pin no. pin name description 1 out1 output, channel 1 2 -in1 negative input, channel 1 3 +in1 positive input, channel 1 4 -v s negative supply 5 +in2 positive input, channel 2 6 -in2 negative input, channel 2 7 out2 output, channel 2 8 +v s positive supply xr2008 pin conguration soic-8 / msop-8 - + - + 12 3 4 out1 -in1 +in1 -v s +v s out2-in2 +in2 87 6 5
? 2014 exar corporation 6 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 typical performance characteristics t a = 25c, v s = +5v, r f = r g = 1k, r l = 1k to v s /2; g = 2; unless otherwise noted. frequency response vs c l frequency response vs r l non-inverting frequency response at v s = 2.7v inverting frequency response at v s = 2.7v non-inverting frequency response at v s = 5v inverting frequency response at v s = 5v normalized magnitude (1db/div) frequency (mhz) 0.1 1 g = 10 r f = 1k 1 10 100 g = 5 r f = 1k 1 g = 1 r f = 0 g = 2 r f = 1k 1 normalized magnitude (1db/div) frequency (mhz) 0.1 1 g = -10 r f = 1k 1 10 100 g = -5 r f = 1k 1 g = -2 r f = 1k 1 g = -1 r f = 1k 1 normalized magnitude (2db/div) frequency (mhz) 0.1 1 g = 10 r f = 2k 1 10 100 g = 5 r f = 1k 1 g = 1 r f = 0 g = 2 r f = 1k 1 normalized magnitude (1db/div) frequency (mhz) 0.1 1 g = -10 r f = 1k 1 10 100 g = -5 r f = 1k 1 g = -1 r f = 1k 1 g = -2 r f = 1k 1 magnitude (1db/div) frequency (mhz) 0.1 1 10 100 c l = 100pf r s = 100 1 c l = 50pf r s = 100 1 c l = 10pf r s = 0 1 c l = 20pf r s = 100 1 + - 1k 1 1k 1 r s c l r l magnitude (1db/div) frequency (mhz) 0.1 1 10 100 r l = 1k 1 r l = 10k 1 r l = 100 1
? 2014 exar corporation 7 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 typical performance characteristics t a = 25c, v s = +5v, r f = r g = 1k, r l = 1k to v s /2; g = 2; unless otherwise noted. 2nd & 3rd harmonic distortion at v s = 2.7v frequency response vs. temperature 2nd harmonic distortion vs v out 3rd harmonic distortion vs v out frequency response vs. v out open loop gain & phase vs. frequency magnitude (1db/div) frequency (mhz) 0.1 1 10 100 v o = 1v pp v o = 2v pp v o = 4v pp open loop gain (db) frequency (hz) -10 0 10 20 30 -180 -135 -90 -45 0 40 50 60 70 80 90 1k 100 10k 100k 1m 10m 100m open loop phase (deg) gain phase distortion (dbc) output amplitude (v pp ) 0.5 1 1.5 2 1mhz 500khz 100khz 2.5 -90 -80 -70 -60 -50 -40 -30 -20 distortion (db) output amplitude (v pp ) 0.5 1.0 1.5 2.0 1mhz 500khz 100khz 2.5 -90 -80 -70 -60 -50 -40 -30 -20 distortion (dbc) frequency (mhz) 0 1 2 3 4 3rd r l = 1k 1 5 3rd r l = 150 1 2nd r l = 150 1 2nd r l = 1k 1 -90 -80 -70 -60 -50 -40 -30 -20 v o = 1v pp magnitude (1db/div) frequency (mhz) 0.01 1 100 10 0.1
? 2014 exar corporation 8 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 typical performance characteristics t a = 25c, v s = +5v, r f = r g = 1k, r l = 1k to v s /2; g = 2; unless otherwise noted. small signal pulse response at v s = 2.7v small signal pulse response at v s = 5v output swing output voltage vs. output current cmrr psrr cmrr (db) frequency (hz) 100 1k 10k 10m 1m 100k 100m -100 -90 -80 -70 -60 0 -50 -40 -10 -30 -20 psrr (db) frequency (hz) 100 1k 10k 10m 1m 100k 100m -80 -70 -60 -50 -40 0 -30 -20 -10 output voltage (0.5v/div) time (1 + s/div) 0 2.7 output voltage (0.6v/div) output current (10ma/div) 50 0 -50 -3 0 3 output voltage (20mv/div) time (10ns/div) output voltage (20mv/div) time (10ns/div)
? 2014 exar corporation 9 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 typical performance characteristics t a = 25c, v s = +5v, r f = r g = 1k, r l = 1k to v s /2; g = 2; unless otherwise noted. large signal pulse response at v s = 5v input voltage noise output voltage (0.5v/div) time (10ns/div) voltage noise (nv/ 3 hz) frequency (mhz) 0.0001 0.001 0.01 0.1 1 10 0 10 30 20 40 50 60 70
? 2014 exar corporation 10 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 application information general description the xr1008 family are a single supply, general purpose, voltage-feedback ampliers fabricated on a complementary bipolar process. the xr1008 offers 75mhz unity gain bandwidth, 50v/s slew rate, and only 505a supply current. it features a rail-to-rail output stage and is unity gain stable. figures 1, 2, and 3 illustrate typical circuit congurations for non-inverting, inverting, and unity gain topologies for dual supply applications. they show the recommended bypass capacitor values and overall closed loop gain equations. figure 4 shows the typical non-inverting gain circuit for single supply applications. the common mode input range extends to 300mv below ground in single supply operation. exceeding these values will not cause phase reversal. however, if the input voltage exceeds the rails by more than 0.5v, the input esd devices will begin to conduct. the design uses a darlington output stage. the output stage is short circuit protected and offers soft saturation protection that improves recovery time. + - r f 0.1f 6.8f output g = 1 + (r f /r g ) input +v s -v s r g 0.1f 6.8f r l figure 1: typical non-inverting gain circuit + - r f 0.1f 6.8f output g = - (r f /r g ) for optimum input offset voltage set r 1 = r f || r g input +v s -v s 0.1f 6.8f r l r g r 1 figure 2: typical inverting gain circuit + - 0.1f 6.8f output g = 1 input +v s -v s 0.1f 6.8f r l figure 3: unity gain circuit + - r f 0.1f 6.8f out in +v s + r g figure 4: single supply non-inverting gain circuit for optimum response at a gain of +2, a feedback resistor of 1k is recommended. figure 5 illustrates the xr1008 frequency response with both 1k and 2k feedback resistors. magnitude (1db/div) frequency (mhz) 0.1 1 10 100 g = 2 r l = 1k r f = 1k r f = 2k figure 5: frequency response vs. r f
? 2014 exar corporation 11 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 power dissipation power dissipation should not be a factor when operating under the stated 1k load condition. however, applications with low impedance, dc coupled loads should be analyzed to ensure that maximum allowed junction temperature is not exceeded. guidelines listed below can be used to verify that the particular application will not cause the device to operate beyond its intended operating range. maximum power levels are set by the absolute maximum junction rating of 150c. to calculate the junction temperature, the package thermal resistance value theta ja ( ja ) is used along with the total die power dissipation. t junction = t ambient + ( ja p d ) where t ambient is the temperature of the working environment. in order to determine p d , the power dissipated in the load needs to be subtracted from the total power delivered by the supplies. p d = p supply - p load supply power is calculated by the standard power equation. p supply = v supply i rmssupply v supply = v s+ - v s- power delivered to a purely resistive load is: p load = ((v load ) rms 2 )/rload eff the effective load resistor (rload eff ) will need to include the effect of the feedback network. for instance, rload eff in figure 3 would be calculated as: r l || (r f + r g ) these measurements are basic and are relatively easy to perform with standard lab equipment. for design purposes however, prior knowledge of actual signal levels and load impedance is needed to determine the dissipated power. here, p d can be found from p d = p quiescent + p dynamic - p load quiescent power can be derived from the specied i s values along with known supply voltage, v supply . load power can be calculated as above with the desired signal amplitudes using: (v load ) rms = v peak / 2 ( i load ) rms = ( v load ) rms / rload eff the dynamic power is focused primarily within the output stage driving the load. this value can be calculated as: p dynamic = (v s+ - v load ) rms ( i load ) rms assuming the load is referenced in the middle of the power rails or v supply /2. the xr1008 is short circuit protected. however, this may not guarantee that the maximum junction temperature (+150c) is not exceeded under all conditions. figure 6 shows the maximum safe power dissipation in the package vs. the ambient temperature for the packages available. 0 0.5 1 1.5 -40 -20 0 20 40 60 80 100 120 maximum power dissipation (w) ambient temperature ( c) msop-8 soic-8 tsot-5 figure 6. maximum power derating driving capacitive loads increased phase delay at the output due to capacitive loading can cause ringing, peaking in the frequency response, and possible unstable behavior. use a series resistance, r s , between the amplier and the load to help improve stability and settling performance. refer to figure 7. + - r f input output r g r s c l r l figure 7. addition of r s for driving capacitive loads table 1 provides the recommended r s for various capacitive loads. the recommended r s values result in approximately <1db peaking in the frequency response. c l (pf) r s () -3db bw (mhz) 10pf 0 22 20pf 100 19 50pf 100 12 100pf 100 10.2 table 1: recommended r s vs. c l
? 2014 exar corporation 12 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 for a given load capacitance, adjust r s to optimize the tradeoff between settling time and bandwidth. in general, reducing r s will increase bandwidth at the expense of additional overshoot and ringing. overdrive recovery for an amplier, an overdrive condition occurs when the output and/or input ranges are exceeded. the recovery time varies based on whether the input or output is overdriven and by how much the ranges are exceeded. the xr1008, and xr2008 will typically recover in less than 20ns from an overdrive condition. figure 5 shows the xr1008 in an overdriven condition. output voltage (1v/div) input voltage (0.5v/div) time (200ns/div) g = 5 output input figure 8: overdrive recovery layout considerations general layout and supply bypassing play major roles in high frequency performance. exar has evaluation boards to use as a guide for high frequency layout and as an aid in device testing and characterization. follow the steps below as a basis for high frequency layout: include 6.8f and 0.1f ceramic capacitors for power supply decoupling place the 6.8f capacitor within 0.75 inches of the power pin place the 0.1f capacitor within 0.1 inches of the power pin remove the ground plane under and around the part, especially near the input and output pins to reduce parasitic capacitance minimize all trace lengths to reduce series inductances refer to the evaluation board layouts below for more information. evaluation board information the following evaluation boards are available to aid in the testing and layout of these devices: evaluation board # products ceb002 xr1008 in tsot ceb003 xr1008 in soic ceb006 xr2008 in soic ceb010 xr2008 in msop evaluation board schematics evaluation board schematics and layouts are shown in figures 9-18 these evaluation boards are built for dual- supply operation. follow these steps to use the board in a single-supply application: 1. short -v s to ground. 2. use c3 and c4, if the -v s pin of the amplier is not directly connected to the ground plane. figure 9. ceb002 & ceb003 schematic
? 2014 exar corporation 13 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 figure 10. ceb002 top view figure 11. ceb002 bottom view figure 12. ceb003 top view figure 13. ceb003 bottom view figure 14. ceb006 & ceb010 schematic
? 2014 exar corporation 14 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 figure 15. ceb006 top view figure 16. ceb006 bottom view figure 17. ceb010 top view figure 18. ceb010 bottom view
? 2014 exar corporation 15 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 mechanical dimensions tsot-5 package msop-8 package
? 2014 exar corporation 16 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 soic-8 package
for further assistance: email: customersupport@exar.com or hpatechsupport@exar.com exar technical documentation: http://www.exar.com/techdoc/ exar corporation headquarters and sales offices 48760 kato road tel.: +1 (510) 668-7000 fremont, ca 94538 - usa fax: +1 (510) 668-7001 notice exar corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. exar corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. charts and schedules contained here in are only for illustration purposes and may vary depending upon a users specic application. while the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to signicantly affect its safety or effectiveness. products are not authorized for use in such applications unless exar corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of exar corporation is adequately protected under the circumstances. reproduction, in part or whole, without the prior written consent of exar corporation is prohibited. ? 2014 exar corporation 17 / 17 exar.com/xr1008 rev 1b xr1008, xr2008 ordering information part number package green operating temperature range packaging quantity marking xr1008 ordering information xr1008ist5x tsot-5 yes -40c to +125c 2.5k tape & reel tc xr1008ist5mtr tsot-5 yes -40c to +125c 250 tape & reel tc xr1008ist5evb evaluation board n/a n/a n/a n/a xr1008iso8x soic-8 yes -40c to +125c 2.5k tape & reel xr1008 xr1008iso8mtr soic-8 yes -40c to +125c 250 tape & reel xr1008 xr1008iso8evb evaluation board n/a n/a n/a n/a xr2008 ordering information xr2008iso8x soic-8 yes -40c to +125c 2.5k tape & reel xr2008 xr2008iso8mtr soic-8 yes -40c to +125c 250 tape & reel xr2008 xr2008iso8evb evaluation board n/a n/a n/a n/a xr2008imp8x msop-8 yes -40c to +125c 2.5k tape & reel 2008 xr2008imp8mtr msop-8 yes -40c to +125c 250 tape & reel 2008 XR2008IMP8EVB evaluation board n/a n/a n/a n/a moisture sensitivity level for all parts is msl-1. revision history revision date description 1a june 2014 initial release 1b sept 2014 added xr1008 esd, increased operating temperature range, updated package outline drawings, and removed preliminary note on xr1008. [ecn1436-02 l 9/4/14 [ecn1426-09 l 6/24/14]

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