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clc450 single supply, low power, high output, current feedback amplifier general description the clc450 has a new output stage that delivers high output drive current (100ma), but consumes minimal quiescent supply current (1.5ma) from a single 5v supply. its current feedback architecture, fabricated in an advanced complementary bipolar process, maintains consistent performance over a wide range of gains and signal levels, and has a linear phase response up to one half of the -3db frequency. the clc450 offers superior dynamic performance with a 100mhz small signal bandwidth, 280v/s slew rate and 6.1ns rise/fall times (2v step ). the combination of low quiescent power, high output current drive, and high speed performance make the clc450 well suited for many battery powered personal communication/computing systems. the ability to drive low impedance, highly capacitive loads, makes the clc450 ideal for single ended cable applications. it also drives low impedance loads with minimum distortion. the clc450 will drive a 100 w load with only ?75/?64dbc second/third harmonic distortion (a v =+2, v out =2v pp ,f= 1mhz). with a 25 w load, and the same conditions, it produces only ?70/?60dbc second/third harmonic distortion. it is also optimized for driving high currents into single-ended transformers and coils. when driving the input of high resolution a/d converters, the clc450 provides excellent ?79/?75dbc second/third harmonic distortion (a v = +2, v out =2v pp , f = 1mhz, r l = 1k w ) and fast settling time. available in sot23-5, the clc450 is ideal for applications where space is critical. features n 100ma output current n 1.5ma supply current n 100mhz bandwidth (a v = +2) n ?79/?75dbc hd2/hd3 (1mhz) n 20ns settling to 0.05% n 280v/s slew rate n stable for capacitive loads up to 1000pf n single 5v to 5v supplies n available in tiny sot23-5 package applications n coaxial cable driver n twisted pair driver n transformer/coil driver n high capacitive load driver n video line driver n portable/battery powered applications n a/d driver connection diagrams maximum output voltage vs. r l ds012733-65 ds012733-4 pinout dip & soic ds012733-3 pinout sot23-5 march 2001 clc450 single supply, low power, high output, current feedback amplifier ? 2001 national semiconductor corporation ds012733 www.national.com
typical application ordering information package temperature range industrial part number package marking nsc drawing 8-pin plastic dip ?40c to +85c clc450ajp clc450ajp n08e 8-pin plastic soic ?40c to +85c clc450aje clc450aje m08a 5-pin sot ?40c to +85c CLC450AJM5 a20 ma05a ds012733-1 single supply cable driver ds012733-2 response after 10m of cable clc450 www.national.com 2
absolute maximum ratings (note 1) if military/aerospace specified devices are required, please contact the national semiconductor sales office/distributors for availability and specifications. supply voltage (v cc -v ee ) +14v output current (see note 3) 140ma common mode input voltage v ee to v cc maximum junction temperature +150c storage temperature range ?65c to +150c lead solder duration (+300c) 10 sec esd rating (human body model) 500v operating ratings thermal resistance package ( q jc )( q ja ) mdip 115c/w 125c/w soic 130c/w 150c/w sot23 140c/w 210c/w +5v electrical characteristics a v = +2, r f = 1k, r l = 100 w ,v s = +5 (note 4), v cm =v ee +(v s /2), r l tied to v cm ; unless specified symbol parameter conditions typ min/max (note 2) units ambient temperature clc450aj +25c +25c 0 to 70c ?40 to 85c frequency domain response -3db bandwidth v o < 0.5v pp 100 85 75 70 mhz v o < 2.0v pp 75 60 55 50 mhz ?0.1db bandwidth v o < 0.5v pp 30 25 20 20 mhz gain ppeaking < 200mhz, v o < 0.5v pp 0 0.5 0.9 1.0 db gain rolloff < 30mhz, v o < 0.5v pp 0.1 0.3 0.4 0.5 db linear phase deviation < 30mhz, v o = 0.5v pp 0.2 0.4 0.5 0.5 deg time domain response rise and fall time 2v step 6.1 8.5 9.2 10.0 ns settling time to 0.05% 1v step 20 30 50 80 ns overshoot 2v step 16 20 22 22 % slew rate 2v step 280 200 185 170 v/s distortion and noise response 2nd harmonic distortion 2v pp ,1mhz ?75 - - - dbc 2v pp , 1mhz, r l =1k w ?79 - - - dbc 2v pp , 5mhz ?62 -58 -57 -56 dbc 3rd harmonic distortion 2v pp , 1mhz ?64 - - - dbc 2v pp , 1mhz, r l =1k w ?75 - - - dbc 2v pp , 5mhz ?52 -48 -46 -46 dbc equivalent input noise voltage (e ni ) > 1mhz 3.0 3.7 4.0 4.0 nv/ non-inverting current (i bn ) > 1mhz 6.9 9 10 10 pa/ inverting current (i bi ) > 1mhz 8.5 11 12 12 pa/ static, dc performance input offset voltage (note 5) 1456mv average drift 7 - 15 15 v/c input bias current (non-inverting) (note 5) 5 121516a average drift 25 - 60 60 na/c input bias current (inverting) (note 5) 3 101213a average drift 10 - 20 20 na/c power supply rejection ratio dc 54 50 48 48 db common mode rejection ratio dc 51 47 45 45 db clc450 www.national.com 3
+5v electrical characteristics (continued) a v = +2, r f = 1k, r l = 100 w ,v s = +5 (note 4), v cm =v ee +(v s /2), r l tied to v cm ; unless specified symbol parameter conditions typ min/max (note 2) units static, dc performance supply current (note 5) r l = 1.5 1.7 1.8 1.8 ma miscellaneous performance input resistance (non-inverting) 0.46 0.37 0.33 0.33 m w input capacitance (non-inverting) 1.5 2.3 2.3 2.3 pf input voltage range, high 4.2 4.1 4.1 4.0 v input voltage range, low 0.8 0.9 0.9 1.0 v output voltage range, high r l = 100 w 4.0 3.9 3.9 3.8 v output voltage range, low r l = 100 w 1.0 1.1 1.1 1.2 v output voltage range, high r l = 4.1 4.0 4.0 3.9 v output coltage range, low r l = 0.9 1.0 1.0 1.1 v output current (note 3) 100 80 65 40 ma output resistance, closed loop dc 55 90 90 120 m w 5v electrical characteristics a v = +2, v cc = 5v, r l = 100 w ,r f =1k w ; unless specified symbol parameterm conditions typ min/max (note 2) units ambient temperature clc450aj +25c +25c 0 to 70c ?40 to 85c frequency domain response -3db bandwidth v o < 1.0v pp 135 115 105 100 mhz v o < 4.0v pp 55 45 42 40 mhz ?0.1db bandwidth v o < 1.0v pp 40 30 25 25 mhz gain peaking < 200mhz, v o < 1.0v pp 0 0.5 0.9 1.0 db gain rolloff < 30mhz, v o < 1.0v pp 0.1 0.3 0.4 0.5 db linear phase deviation < 30mhz, v o < 1.0v pp ) 0.1 0.3 0.4 0.4 deg differential gain ntsc, r l = 150 w 0.03 - - - % differential phase ntsc, r l = 150 w 0.3 - - - deg time domain response rise and fall time 2v step 4.4 5.8 6.2 6.8 ns settling time to 0.05% 2v step 15 25 40 60 ns overshoot 2v step 15 20 22 22 % slew rate 2v step 370 280 260 240 v/s distortion and noise response 2nd harmonic distortion 2v pp , 1mhz ?86 - - - dbc 2v pp , 1mhz, r l =1k w ?85 - - - dbc 2v pp , 5mhz ?68 ?64 ?61 ?60 dbc 3rd harmonic distortion 2v pp , 1mhz ?65 - - - dbc 2v pp , 1mhz, r l =1k w ?74 - - - dbc 2v pp , 5mhz ?52 ?48 ?46 ?46 dbc equivalent input noise voltage (e ni ) > 1mhz 3.0 3.7 4.0 4.0 nv/ non-inverting current (i bn ) > 1mhz 6.9 9 10 10 pa/ inverting current (i bi ) > 1mhz 8.5 11 12 12 pa/ clc450 www.national.com 4
5v electrical characteristics (continued) a v = +2, v cc = 5v, r l = 100 w ,r f =1k w ; unless specified symbol parameterm conditions typ min/max (note 2) units static, dc performance input offset voltage 2678mv average drift 8 - 20 20 v/c input bias current (non-inverting) 5 12 16 17 a average drift 40 - 70 70 na/c input bias current (inverting) 5 13 15 16 a average drift 20 - 45 45 na/c power supply rejection ratio dc 56 51 49 49 db common-mode rejection ratio dc 53 48 46 46 db supply current r l = 1.6 1.9 2.0 2.0 ma miscellaneous performance input resistance (non-inverting) 0.62 0.50 0.45 0.45 m w input capacitance (non-inverting) 1.2 1.8 1.8 1.8 pf common-mode input range 4.2 4.1 4.1 4.0 v output voltage range r l = 100 w 3.8 3.6 3.6 3.5 v output voltage range r l = 4.0 3.8 3.8 3.7 v output current (note 3) 130 100 80 50 ma output resistance, closed loop dc 40 70 70 90 m w note 1: aabsolute maximum ratingso are those values beyond which the safety of the device cannot be guaranteed. they are not meant to imply that the devices should be operated at these limits. the table of aelectrical characteristicso specifies conditions of device operation. note 2: min/max ratings are based on product characterization and simulation. individual parameters are tested as noted. outgoing quality levels are deter mined from tested parameters. note 3: the short circuit current can exceed the maximum safe output current. note 4: v s =v cc ?v ee note 5: aj-level: spec. is 100% tested at +25c. +5v typical performance characteristics non-inverting frequency response ds012733-5 inverting frequency response ds012733-6 clc450 www.national.com 5
+5v typical performance characteristics (continued) frequency response vs. r l ds012733-7 frequency response vs. v o ds012733-8 frequency response vs. c l ds012733-9 open loop transimpedance gain, z(s) ds012733-10 gain flatness magnitude (0.05db/div) frequency (mhz) 10 20 30 ds012733-11 equivalent input noise ds012733-12 clc450 www.national.com 6
+5v typical performance characteristics (continued) 2nd & 3rd harmonic distortion ds012733-13 2nd harmonic distortion, r l =25 w ds012733-14 3rd harmonic distortion, r l =25 w ds012733-15 2nd harmonic distortion, r l = 100 w ds012733-16 3rd harmonic distortion, r l = 100 w distortion (dbc) output amplitude (v pp ) 0 0.5 1 1.5 2 2.5 -70 -60 -50 -40 -30 2mhz 5mhz 10mhz 1mhz ds012733-17 2nd harmonic distortion, r l =1k w ds012733-18 clc450 www.national.com 7
+5v typical performance characteristics (continued) 3rd harmonic distortion, r l =1k w ds012733-19 closed loop output resistance ds012733-20 recommended r s vs. c l ds012733-21 large & small signal pulse response ds012733-22 psrr & cmrr ds012733-23 i bi ,i bn ,v os vs. temperature ds012733-24 clc450 www.national.com 8
+5v typical performance characteristics (continued) 5v typical performance characteristics maximum output voltage vs. r l ds012733-25 non-inverting frequency response ds012733-26 inverting frequency response ds012733-27 frequency response vs. r l ds012733-28 frequency response vs. v o ds012733-29 clc450 www.national.com 9
5v typical performance characteristics (continued) frequency response vs. c l ds012733-30 gain flatness magnitude (0.05db/div) frequency (mhz) 10 20 30 ds012733-31 small signal pulse response ds012733-32 large signal pulse response ds012733-33 2nd & 3rd harmonic distortion ds012733-34 2nd harmonic distortion, r l =25 w ds012733-35 clc450 www.national.com 10
5v typical performance characteristics (continued) 3rd harmonic distortion, r l =25 w ds012733-36 2nd harmonic distortion, r l = 100 w ds012733-37 3rd harmonic distortion, r l = 100 w ds012733-38 2nd harmonic distortion, r l =1k w ds012733-39 3rd harmonic distortion, r l =1k w ds012733-40 recommended r s vs. c l ds012733-41 clc450 www.national.com 11
5v typical performance characteristics (continued) maximum output voltage vs. r l ds012733-42 differential gain & phase ds012733-43 i bi ,i bn ,v os vs. temperature offset voltage v os (mv) temperature ( ? c) -100 -50 0 50 100 150 -0.5 0 0.5 1 1.5 i bi , i bn ( m a) -4 0 4 8 12 i bn i bi v os ds012733-44 short term settling time ds012733-45 long term settling time ds012733-46 clc450 www.national.com 12
application division clc450 operation the clc450 is a current feedback amplifier built in an advanced complementary bipolar process. the clc450 operates from a single 5v supply or dual 5v supplies. operating from a single supply, the clc450 has the following features: provides 100ma of output current while consuming 7.5mw of power offers low ?79/?75db 2nd and 3rd harmonic distortion provides bw > 60mhz and 1mhz distortion < ?65dbc at v o = 2.5v pp the clc450 performance is further enhanced in 5v supply application as indicated in the 5v electrical characteris- tics table and 5v typical performance plots. current feedback amplifiers some of the key features of current feedback technology are: independence of ac bandwidth and voltage gain inherently stable at unity gain adjustable fequency response with feedback resistor high slew rate fast settling current feedback operation can be described using a simple equation. the voltage gain for a non-inverting or inverting current feedback amplifier is approximated by equation 1. (1) where: a v is the closed loop dc voltage gain r f is the feedback resistor z( j( w ) ) is the clc450's open loop transimpedance gain z( j( w ) )/r f is the loop gain the denominator of equation 1 is approximately equal to 1 at low frequencies. near the -3db corner frequency, the interaction between r f and z (j( w ) dominates the circuit performance. the value of the feedback resistor has a large affect on the circuits performance. increasing r f has the following affects: decreases loop gain decreases bandwidth reduces gain peaking lowers pulse response overshoot affects frequency response phase linearity refer to the feedback resistor selection section for more details on selecting a feedback resistor value. design information single supply operation (v cc = +5v, v ee = gnd) the specifications given in the +5v electrical characteris- tics table for single supply operation are measured with a common mode voltage (v cm ) of 2.5v. v cm is the voltage around which the inputs are applied and the output voltages are specified. operating from a single +5v supply, the common mode input range (cmir) of the clc450 is typically +0.8v to +4.2v. the typical output range with r l = 100 w is +1.0v to +4.0v. for single supply dc coupled operation, keep input signal levels above 0.8v dc. for input signals that drop below 0.8v dc, ac coupling and level shifting the signal are recommended. the non-inverting and inverting configura- tions for both input conditions are illustrated in the following 2 sections. dc coupled single supply operation figure 1 and figure 2 show the recommended non-inverting and inverting configurations for input signals that remain above 0.8v dc. ac coupled single supply operation figure 3 and figure 4 show possible non-inverting and inverting configurations for input signals that go below 0.8v dc. the input is ac coupled to prevent the need for level shifting the input signal at the source. the resistive voltage divider biases the non-inverting input to v cc 2 = 2.5v (for v cc = +5v). ds012733-47 equation 1. figure 1. non-inverting configuration ds012733-50 figure 2. inverting configuration clc450 www.national.com 13
application division (continued) dual supply operation the clc450 operates on dual supplies as well as single supplies. the non-inverting and inverting configurations are shown in figure 5 and figure 6 . feedback resistor selection the feedback resistor, r f , affects the loop gain and frequency response of a current feedback amplifier. optimum performance of the clc450, at a gain of +2v/v, is achieved with r f equal to 1k w . the frequency response plots in the typical performance sections illustrate the recommended r f for several gains. these recommended values of r f provide the maximum bandwidth with minimal peaking. within limits, r f can be adjusted to optimize the frequency response. decrease r f to peak frequency response and extend bandwidth increases r f to roll off frequency response and compress bandwidth as a rule of thumb, if the recommended r f is doubled, then the bandwidth will be cut in half. ds012733-51 figure 3. ac coupled non -inverting configuration ds012733-52 figure 4. ac coupled inverting configuration ds012733-53 figure 5. dual supply non-inverting configuration ds012733-54 figure 6. dual supply inverting configuration clc450 www.national.com 14
application division (continued) unity gain operation the recommended r f for unity gain (+1v/v) operation is 1.5k w .r g is left open. parasitic capacitance at the inverting node may require a slight increase in r f to maintain a flat frequency response. bandwidth vs. output amplitude the bandwidth of the clc450 is at a maximum for output voltages near 1vpp. the bandwidth decreases for smaller and larger output amplitudes. refer to the frequency response vs. v o plots. load termination the clc450 can source and sink near equal amounts of current. for optimum performance, the load should be tied to v cm . driving cables and capacitive loads when driving cables, double termination is used to prevent reflections. for capacitive load application, a small series resistor at the output of the clc450 will improve stability and settling performance. the frequency response vs. c l and recommended r s vs. c l plots, in the typical performance section, give the recommended series resistance value for optimum flatness at various capacitive loads. transmission line matching one method for matching the characteristic impedance (z o ) of a transmission line or cable is to place the appropriate resistor at the input or output of the amplifier. figure 7 shows typical inverting and non-inverting circuit configurations for matching transmission lines. non-inverting gain applications: connect r g directly to ground. make r 1 ,r 2 ,r 6 ,r 7 equal to z o . use r 3 to isolate the amplifier from reactive loading caused by the transmission line, or by parasitics. inverting gain applications: connect r 3 directly to ground. make the resistors r 4 ,r 6 , and r 7 equal to z o make r 5 \ r g =z o the input and output matching resistors attenuate the signal by a factor of 2, therefore additional gain is needed. use c 6 to match the output transmission line over a greater frequency range. c 6 compensates for the increase of the amplifier's output impedance with frequency. power dissipation follow these steps to determine the power consumption of the clc450: 1. calculate the quiescent (no-load) power: p amp =i cc (v cc ?v ee ) 2. calculate the rms power at the output stage:p o =(v cc ?v load )(i load ), where v load and i load are the rms voltage and current across the external load. 3. calculate the total rms power:p t =p amp +p o the maximum power that the dip, soic, and sot packages can dissipate at a given temperature is illustrated in figure 8 . the power derating cure for any clc450 package can be derived by utilizing the following equation: where t amb = ambient temperature (c) q ja = thermal resistance, from junction to ambient, for a given package (c/w) layout considerations a proper printed circuit layout is essential for achieving high frequency performance. national provides evaluation boards for the clc450 (730013-dip, 730027-soic, 730068-sot) and suggests their use as a guide for high frequency layout and as an aid for device testing and characterization. general layout and supply bypassing play major roles in high frequency performance. follow the steps below as a basis for high frequency layout: include 6.8f tantalum and 0.1f ceramic capacitors on both supplies place the 6.8f capacitors within 0.75 inches of the power pins. place the 0.1f capacitors less than 0.1 inches from the power pins 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. use flush-mount printed circuit board pins for prototyping, never use high profile dip sockets. evaluation board information data sheet are available for the clc730013/clc730027 and clc730068 evaluation boards. the evaluation board data sheets provide: evaluation board schematics evaluation board layouts ds012733-55 figure 7. transmission line matching ds012733-57 figure 8. power derating curves clc450 www.national.com 15
application division (continued) general information about the boards the clc730013/clc730027 data sheet also contains tables of recommended components to evaluate several of national's high speed amplifiers. this table for the clc450 is illustrated below. refer to the evaluation board data sheet for schematics and further information. components needed to evaluate the clc450 on the evaluation board: r f ,r g e use this product data sheet to select values. r in ,r out - typically 50 w (refer to the basic operation section of the evaluation board data sheet for details r f e optional resistor for inverting gain configurations (select r f to yield desired input impedance = r g \ r f c 1 ,c 2 - 0.1 f ceramic capacitors c 3 ,c 4 - 6.8 f tantalum capacitors c 5 ,c 6 ,c 7 ,c 8 r 1 thru r 8 components not used: c 5 ,c 6 ,c 7 ,c 8 r 1 thru r 8 the evaluation boards are designed to accommodate dual supplies. the boards can be modified to provide single supply operation. for best performance; 1) do not connect the unused supply, 2) ground the unused supply pin. spice models spice models provide a means to evaluate amplifier designs. free spice models are available for national's monolithic amplifiers that: support berkeley spice 2g and its many derivatives reproduce typical dc, ac, transient, and noise performance support room temperature simulations the readme file that accompanies the diskette lists released models, and provides a list of modeled parameters. the application note oa-18, simulation spice models for national's op amps, contains schematics and a reproduction of the readme file. application circuits single supply cable driver the typical application shown on the front page shows the clc450 driving 10m of 75 w coaxial cable. the clc450 is set for a gain of +2v/v to compensate for the divide-by-two voltage drop at v o . single supply lowpass filter figure 9 and figure 10 illustrate a lowpass filter and design equations. the circuit operates from a single supply of +5v. the voltage divider biases the non-inverting input to 2.5v. and the input is ac coupled to prevent the need for level shifting the input signal at the source. use the design equations to determine r 1 ,r 2 ,c 1 and c 2 based on the desired q and corner frequency. this example illustrates a lowpass filter with q = 0.707 and corner frequency f c = 10mhz. aq of 0.707 was chosen to achieve a maximally flat, butterworth response. figure 11 indicates the filter response. ds012733-58 figure 9. lowpass filter topology gain k 1 r r corner frequency 1 rr cc q 1 rc rc rc rc (1 k) rc rc for r r r and c c c 1 rc q 1 (3 k) f g c 12 12 22 11 12 21 11 22 12 12 c ==+ == = ++- == == = = - w w ds012733-59 figure 10. design equations ds012733-60 figure 11. lowpass response clc450 www.national.com 16
application division (continued) twisted pair driver the high output current and low distortion, of the clc450, make it well suited for driving transformers. figure 12 illustrates a typical twisted pair driver utilizing the clc450 and a transformer. the transformer provides the signal and its inversion for the twisted pair. to match the line's characteristic impedance (z o ) set: r l =z o r m =r eq where r eq is the transformed value of the load impedance, (r l ), and is approximated by: r r n eq l 2 = select the transformer so that it loads the line with a value close to z o , over the desired frequency range. the output impedance, r o , of the clc450 varies within frequency and can also affect the return loss. the return loss, shown below, takes into account an ideal transformer and the value of r o the load current (i i ) and voltage (v o ) are related to the clc450's maximum output voltage and current by: from the above current relationship, it is obvious that an amplifier with high output drive capability is required. ds012733-61 figure 12. twisted pair driver clc450 www.national.com 17
physical dimensions inches (millimeters) unless otherwise noted 8-pin soic ns package number m08a 8-pin mdip ns package number n08e clc450 www.national.com 18
physical dimensions inches (millimeters) unless otherwise noted (continued) life support policy national's products are not authorized for use as critical components in life support devices or systems without the express written approval of the president and general counsel of national semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. national semiconductor corporation americas tel: 1-800-272-9959 fax: 1-800-737-7018 email: support@nsc.com national semiconductor europe fax: +49 (0) 180-530 85 86 email: europe.support@nsc.com deutsch tel: +49 (0) 69 9508 6208 english tel: +44 (0) 870 24 0 2171 fran?ais tel: +33 (0) 1 41 91 8790 national semiconductor asia pacific customer response group tel: 65-2544466 fax: 65-2504466 email: ap.support@nsc.com national semiconductor japan ltd. tel: 81-3-5639-7560 fax: 81-3-5639-7507 www.national.com 5-pin sot23 ns package number ma05a clc450 single supply, low power, high output, current feedback amplifier national does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and national reserves the righ t at any time without notice to change said circuitry and specifications.

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