typical application diagram instrumentation amplifier pinout dip & soic comlinear clc416 dual low-power, 120mhz op amp august 1996 features n 0.01%, 0.03 d g , d f n very low input bias current: 100na n high input impedance: 6m w n 120mhz -3db bandwidth (a v = +2) n low power n high output current: 60ma n low-cost applications n desktop video systems n video distribution n flash a/d driver n high-speed driver n high-source impedance applications n professional video processing n high resolution monitors general description the comlinear clc416 is a dual, wideband (120mhz) op amp. the clc416 consumes only 39mw per channel and can source or sink an output current of 60ma. these features make the clc416 a versatile, high-speed solution for demanding applications that are sensitive to both power and cost. utilizing comlinear s proven architectures, this dual current feedback amplifier surpasses the performance of alternative solutions and sets new standards for low power. this power- conserving dual op amp achieves low distortion with -80dbc and -80dbc second and third harmonics respectively. many high source impedance applications will benefit from the clc416 s 6m w input impedance. and finally, designers will have a bipolar part with an exceptionally low 100na non-inverting bias current. with 0.1db flatness to 30mhz and low differential gain and phase errors, the clc416 is an ideal part for professional video processing and distribution. the 120mhz -3db bandwidth (a v = +2) coupled with a 400v/ m s slew rate also makes the clc416 a perfect choice in cost-sensitive applications such as video monitors, fax machines, copiers, and catv systems. v o 1 v inv 1 v non-inv 1 -v cc v o 2 v inv 2 v non-inv 2 +v cc + - 348 w 1/2
clc416 r 1
348 w - + 1/2
clc416 348 w 348 w v out = 3(v 2 - v 1 ) 348 w 348 w 348 w - + clc405 v 1 v 2 frequency response (a v = +2v/v) comlinear clc416 dual low-power, 120mhz op amp n 1996 national semiconductor corporation http://www.national.com printed in the u.s.a.
parameters conditions typ min/max ratings units notes ambient temperature clc416aj +25 ? c +25 ? c 0 to 70 ? c -40 to 85 ? c frequency domain response -3db bandwidth v out < 1.0v pp 120 65 45 45 mhz b v out < 5.0v pp 52 40 36 35 mhz 1 0.1db bandwidth v out < 1.0v pp 30 15 mhz gain flatness v out < 1.0v pp peaking dc to 200mhz 0.1 0.7 0.8 1.0 db b rolloff <30mhz 0 0.3 0.6 0.6 db b linear phase deviation <20mhz 0.3 0.6 0.7 0.7 deg differential gain 4.43mhz, r l =150 w 0.01 0.04 0.04 0.04 % differential phase 4.43mhz, r l =150 w 0.03 0.08 0.11 0.12 deg time domain response rise and fall time 2v step 4.3 6.5 7.2 7.4 ns settling time to 0.05% 2v step 22 30 38 41 ns overshoot 2v step 3 12 12 12 % slew rate a v = +2 2v step 400 300 260 250 v/ m s a v = -1 1v step 700 v/ m s distortion and noise response 2 nd harmonic distortion 2v pp , 1mhz -80 dbc 3 rd harmonic distortion 2v pp , 1mhz -80 dbc 2 nd harmonic distortion 2v pp , 10mhz -65 -55 -50 -47 dbc b 3 rd harmonic distortion 2v pp , 10mhz -57 -50 -45 -45 dbc b equivalent input noise voltage >1mhz 5 6.3 6.6 6.7 nv/ ? hz inverting current >1mhz 12 15 16 17 pa/ ? hz non-inverting current >1mhz 3 3.8 4.0 4.2 pa/ ? hz crosstalk, input referred 2v pp , 10mhz 72 66 66 66 db static dc performance input offset voltage 1 5 7 8 mv a average drift 30 50 50 m v/ ? c input bias current non-inverting 100 900 1600 2800 na a average drift 3 8 11 na/ ? c input bias current inverting 1 5 6 8 m aa average drift 17 40 45 na/ ? c power supply rejection ratio dc 52 47 47 45 db b common-mode rejection ratio dc 50 45 45 43 db supply current per channel r l = 3.9 4.5 4.6 4.9 ma a miscellaneous performance input resistance non-inverting 6 3 2.4 1 m w input capacitance non-inverting 1 2 2 2 pf common mode input range 2.2 1.8 1.7 1.5 v output voltage range r l = 100 w +3.5,-2.9 +3.1/-2.8 +2.9/-2.7 +2.4/-1.7 v output voltage range r l = +4.0,-3.4 +3.9/-3.3 +3.8/-3.2 +3.7/-2.8 v output current 60 44 38 20 ma output resistance, closed loop 0.06 0.2 0.25 0.4 w recommended gain range + 1 to + 40v/v transistor count = 110 min/max ratings are based on product characterization and simulation. individual parameters are tested as noted. outgoing quality levels are determined from tested parameters. clc416 electrical characteristics (a v = +2, r f = 348 w : v cc = + 5v, r l = 100 w unless specified) absolute maximum ratings supply voltage 7v i out is short circuit protected to ground common-mode input voltage vcc maximum junction temperature +175 ? c storage temperature range -65 ? c to +150 ? c lead temperature (soldering 10 sec) +300 ? c esd rating (human body model) 1000v notes 1) at temps < 0 ? c, spec is guaranteed for r l = 500 w . a) j-level: spec is 100% tested at +25 ? c, sample tested at +85 ? c. b) j-level: spec is sample tested at +25 ? c. ordering information model temperature range description clc416ajp -40 ? c to +85 ? c 8-pin pdip CLC416AJE -40 ? c to +85 ? c 8-pin soic package thermal resistance package q jc q ja plastic (ajp) 80?/w 95?/w surface mount (aje) 95?/w 115?/w http://www.national.com 2
clc416 typical performance characteristics (v cc = ?v, a v = +2, r f = 348 w, r l = 100 w ; unless specified) frequency response normalized magnitude (1db/div) frequency (mhz) 1 10 100 v o = 0.5v pp phase (deg) -90 -180 -450 -270 -360 0 a v = 1 r f = 1.65k w a v = 2 r f = 348 w a v = 4 r f = 200 w a v = 10 r f = 100 w inverting frequency response normalized magnitude (1db/div) frequency (mhz) 1 10 100 phase (deg) -270 -360 -630 -450 -540 -180 -90 0 a v = -1 r f = 2k w v o = 0.5v pp a v = -4 r f = 255 w a v = -10 r f = 200 w a v = -2 r f = 348 w frequency response vs. r l magnitude (1db/div) frequency (mhz) 1 10 100
phase (deg) -90 -180 -450 -270 -360 0 r l = 100 w v o = 1v pp
a v = +2 r l = 1k w r l = 50 w r l = 50 w r l = 100 w r l = 1k w frequency response vs. v out magnitude (1db/div) frequency (mhz) 1 10 100
1v pp a v = +2 0.2v pp 2v pp 5v pp frequency response vs. c l magnitude (1db/div) frequency (mhz) 1 10 100
v o = 1v pp r s = 107 w c l = 10pf r s = 39.25 w c l = 47pf r s = 27.4 w c l = 100pf r s = 8 w c l = 1000pf r s 1k 348 w 348 w c l open loop transimpedance gain, z(s) 20 log [|v o /| i |] (db w ) 1k 10m 100m frequency (hz) 130 110 90 70 50 30 phase (deg) 200 160 120 80 40 0 gain phase 1m 100k 10k 100 w - + clc416 v o i i maximum output voltage vs. r l maximum output voltage (v) load ( w ) 0 100 200 300 400 -4 -2 0 2 4 500 600 recommended r s vs. capacitive load r s ( w ) c l (pf) 0 20 40 60 80 100 120 10 100 1000 2nd & 3rd harmonic distoration distortion level (dbc) frequency (mhz) 1 10
-70 -80 -90 -60 -50 -40 v o = 2v pp 3rd, r l = 100 w 2nd, r l = 100 w 2nd, r l = 1k w 3rd, r l = 1k w 2nd harmonic distortion vs. p out distortion (dbc) output power (dbm) -90 -85 -80 -75 -70 -65 -60 -55 -10 -5 0 5 10 1mhz 500khz 5mhz 10mhz 50 w 348 w 348 w 50 w p o 3rd harmonic distortion vs. p out distortion (dbc) output power (dbm) -100 -90 -80 -70 -60 -50 -40 -10 -5 0 5 10 1mhz 500khz 5mhz 10mhz 50 w 348 w 348 w 50 w p o differential gain & phase gain (%) number of 150 w loads 0 1 2 4 phase (deg) 0 0.01 0.03 0.02 0.06 0.03 0.09 0.04 0.12 0.05 0.15 0.06 0.18 0.07 0.21 0.08 0.24 0.09 0.27 0.1 0.30 phase negative sync phase positive sync gain positive sync gain negative sync 3 small signal pulse response output voltage (v) time (5ns/div) -0.08 -0.06 -0.04 -0.02 0 0.02 0.04 0.06 0.08
a v = +1 a v = -1 large signal pulse response output voltage (v) time (5ns/div) -2 -1 0 1 2
a v = +2 a v = -2 psrr and cmrr psrr/cmrr (db) 10k 100k 1m frequency (hz) 10m 100m 60 50 40 30 20 10 psrr cmrr 3 http://www.national.com
clc416 typical performance characteristics (v cc = ?v, a v = +2, r f = 348 w, r l = 100 w ; unless specified) clc416 operation description the clc416 is a dual current feedback amplifier with the following features: n differential gain and phase errors of 0.01% and 0.03 into a 150 w load n low, 3.9ma, supply current per amplifier the professional video quality differential gain and phase errors and low power capabilities of the clc416 make this product a good choice for video applications. gain the non-inverting and inverting gain equations for the clc416 are as follows: non-inverting gain: inverting gain: where r f is the feedback resistor and r g is the gain setting resistor. figure 1 shows the general non-invert- ing gain configuration including the recommended bypass capacitors. figure 1: recommended non-inverting gain circuit feedback resistor selection the feedback resistor, r f , determines the loop gain and frequency response of a current feedback amplifier. optimum performance of the clc416, at a gain of +2v/v, is achieved with r f equal to 348 w . the frequency response plots in the typical performance section illustrate the recommended r f for several gains. within limits, r f can be adjusted to optimize the frequency response. n decrease r f to peak frequency response and extend bandwidth n increase r f to roll off frequency response and reduce bandwidth as a rule of thumb, if the recommended r f is doubled, the bandwidth will be cut in half. channel matching channel matching and crosstalk efficiency are largely dependent on board layout. the layout of comlinear s dual amplifier evaluation boards are designed to produce optimum channel matching and isolation. typical channel matching for the clc416 is shown in figure 2. figure 2: channel matching the clc416 s channel-to-channel isolation is better than 70db for input frequencies of 4mhz. input referred crosstalk vs. frequency is illustrated in figure 3. typical dc errors vs. temperature offset voltage (mv) temperature ( c) 6 5 4 1 -50 0 100 3 2 i bn bias current ( m a) 1 0 -1 -2 -3 50 i bi v io equivalent input noise noise voltage (nv/ ? hz) frequency (hz) 100 10 1 1k 100 10k 100k 1m 10m noise current (pa/ ? hz) 100 10 1
inverting current = 12pa/ ? hz voltage = 5nv/ ? hz non-inverting current = 3pa/ ? hz power derating curves power (w) ambient temperature ( c) 0.8 1.0 0.6 0 0 20 40 60 80 100 120 140 160 180 0.4 0.2 aje ajp 1 r r f g + - r r f g + - clc416 r f 0.1 m f 6.8 m f v o v in +v cc 0.1 m f 6.8 m f -v cc r l r g r in g magnitude (0.5db/div) frequency (mhz) 1 10 100 a v = +2 r l = 100 w v o = 2v pp phase (deg) -450 -360 -270 -180 -90 0 channel b channel b channel a channel a http://www.national.com 4
figure 3: input referred crosstalk vs. frequency driving cables and capacitive loads when driving cables, double termination is used to prevent reflections. for capacitive load applications, a small series resistor at the output of the clc416 will improve stability. the r s vs. capacitive load plot, in the typical performance section, gives the recommended series resistance value for optimum flatness at various capacitive loads. power dissipation the power dissipation of an amplifier can be described in two conditions: n quiescent power dissipation - p q (no load condition) n total power dissipation - p t (with load condition) the following steps can be taken to determine the power consumption for each clc416 amplifier: 1. determine the quiescent power p q = i cc (v cc -v ee ) 2. determine 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. determine the total rms power p t = p q + p o add the total rms powers for both channels to deter- mine the power dissipated by the dual. the maximum power that the package can dissipate at a given temperature is illustrated in the power derating curves in the typical performance section. the power derating curve for any package can be derived by utilizing the following equation: where: t amb = ambient temperature (?) q ja = thermal resistance, from junction to ambient, for a given package (?/w) layout considerations a proper printed circuit layout is essential for achieving high frequency performance. comlinear provides evaluation boards for the clc416 (730038 - dip, 730036-soic) and suggests their use as a guide for high frequency layout and as an aid for device testing and characterization. supply bypassing is required for best performance. the bypass capacitors provide a low impedance return current path at the supply pins. they also provide high frequency filtering on the power supply traces. other layout factors play a major role in high frequency performance. the following are recommended as a basis for high frequency layout: 1. include 6.8 m f tantalum and 0.1 m f ceramic capacitors on both supplies. 2. place the 6.8 m f capacitors within 0.75 inches of the power pins. 3. place the 0.1 m f capacitors within 0.1 inches of the power pins. 4. remove the ground plane under and around the part, especially near the input and output pins to reduce parasitic capacitance. 5. minimize all trace lengths to reduce series inductances. additional information is included in the evaluation board literature. spice models spice models provide a means to evaluate amplifier designs. free spice models are available for comlinear s monolithic amplifiers that: n support berkeley spice 2g and its many derivatives n reproduce typical dc, ac, transient, and noise performance n support room temperature simulations the readme file that accompanies the diskette lists released models, and provides a list of modeled para- meters. the application note oa-18, simulation spice models for comlinear s op amps, contains schematics and a reproduction of the readme file. applications circuits instrumentation amplifier an instrumentation circuit is shown on the front page and reproduced in figure 4. the dc cmrr can be fine tuned by adjusting r 1 . figure 4: instrumentation amplifier p (175 tamb) ja = - q + - 348 w 1/2
clc416 r 1
348 w - + 1/2
clc416 348 w 348 w v out = 3(v 2 - v 1 ) 348 w 348 w 348 w - + clc405 v 1 v 2 p crosstalk (db) frequency (mhz) 416 fi 3 -120 -100 -80 -60 -40 -20 1 100 10 5 http://www.national.com
differential line receiver figure 5 illustrates a differential line receiver. the circuit will convert differential signals to single-ended signals. figure 5: differential line receiver bandpass filter figure 6 illustrates a low-sensitivity bandpass filter and design equations. this topology utilizes the clc416 s closely matched amplifiers to obtain low op-amp sensitivity at high frequencies. the clc405 is used as a buffer to obtain low output impedance. the overall circuit gain is unity. for additional gain, the clc405 can be configured as a non-inverting amplifier. to design the filter, choose c and then determine values for r and r 1 based on the desired resonant frequency (f r ) and q factor. figure 7 illustrates a bandpass filter with q = 10 and f r = 1mhz. the component values used are listed below: r 1 = 4.9k w r = 499 w c = 330pf r f = 2k w figure 6: bandpass filter topology figure 7: bandpass response customer design applications support national semiconductor is committed to design excellence. for sales, literature and technical support, call the national semiconductor customer response group at 1-800-272-9959 or fax 1-800-737-7018 . 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 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 national semiconductor national semiconductor national semiconductor corporation europe hong kong ltd. japan ltd. 1111 west bardin road fax: (+49) 0-180-530 85 86 13th floor, straight block tel: 81-043-299-2309 arlington, tx 76017 e-mail: europe.support.nsc.com ocean centre, 5 canton road fax: 81-043-299-2408 tel: 1(800) 272-9959 deutsch tel: (+49) 0-180-530 85 85 tsimshatsui, kowloon fax: 1(800) 737-7018 english tel: (+49) 0-180-532 78 32 hong kong francais tel: (+49) 0-180-532 93 58 tel: (852) 2737-1600 italiano tel: (+49) 0-180-534 16 80 fax: (852) 2736-9960 national does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and national reserves the right at any time without notice to change said circuitry and specifications. + - r 1/2
clc416 + - clc405 v o r r - + 1/2
clc416 v in r r f r 1 c c r 1 2fc rqr r 1 == p magnitude (db) frequency (mhz) 0 -10 -40 1 10
-20 -30 1.8db
935khz comlinear clc416 dual low-power, 120mhz op amp - + v o = 2v in -v in r r r r a v = -1v/v - + 1/2
clc416 1/2
clc416 +v in r r r o a v = -1v/v r n http://www.national.com 6 lit #150416-004
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