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1 ltc1682/ltc1682-3.3/ltc1682-5 doubler charge pumps with low noise linear regulator n low output noise: 60 m v rms (100khz bw) n adjustable or fixed boosted output n adjustable output voltage range: 2.5v to 5.5v n fixed output voltages: 3.3v, 5v n wide input voltage range: 1.8v to 4.4v n uses small ceramic capacitors n no inductors required n output current up to 50ma n 550khz switching frequency n low operating current: 150 m a n low shutdown current: 1 m a n internal thermal shutdown and current limiting n available in 8-pin msop and so packages the ltc ? 1682/ltc1682-3.3/ltc1682-5 are doubler charge pumps with an internal low noise, low dropout (ldo) linear regulator. these parts are designed to provide a low noise boosted supply voltage for powering noise sensitive devices such as high frequency vcos in wireless applications. an internal doubler charge pump converts a 1.8v to 4.4v input to a boosted output, while the internal ldo regulator converts the boosted voltage to a low noise regulated output. the adjustable version allows the user to set v out via external resistors connected to fb. the regulator is capable of supply- ing up to 50ma of output current. shutdown reduces the supply current to < 5 m a, removes the load from v in by disabling the regulator and discharges v out to ground through a 100 w switch. the ltc1682 ldo regulator is stable with only 2 m f on the output. small ceramic capacitors can be used, reducing pc board area. the ltc1682/ltc1682-3.3/ltc1682-5 are short-circuit and over temperature protected. the parts are available in 8-pin msop and so packages. , ltc and lt are registered trademarks of linear technology corporation. open-loop close-in phase noise center = 902mhz res bw = 1khz span = 100khz vbw = 30hz swp = 10 sec ref = 0dbm 1682 ta02 4.2v vco power supply, v in = 2.5v to 4.4v n vco power supplies in cellular phones n 2-way pagers n wireless pcmcia cards n portable medical instruments n low power data acquisition n remote transmitters amplitude 10db/div features descriptio u applicatio s u typical applicatio u 36k shutdown 15k 100k 4.7 f 0.22 f v in 2.5v to 4.4v 4.7 f 4.2v 1 2 3 4 8 7 6 5 v out shdn fb gnd cpo c + v in c 1682 ta01 ltc1682 vco murata mqe001-902 1 f 4.7 f 1000pf 1k b m p c 1000pf 1000pf 4.7 f v c f out 902mhz
2 ltc1682/ltc1682-3.3/ltc1682-5 the l denotes specifications that apply over the full operating temperature range, otherwise specifications are t a = 25 c. shdn = v in = 3v; c1 = 0.22 m f; c2, c3, c4 = 4.7 m f, unless otherwise noted. (note 1) v in to ground ..............................................C 0.3v to 5v v out voltage ................................................C 0.3v to 6v cpo to ground ........................................................ 10v shdn, filt/fb voltage to ground ..................................... C 0.3v to (v in + 0.3v) v out short-circuit duration ............................ indefinite i out ...................................................................... 75ma operating temperature range commercial ............................................ 0 c to 70 c extended commercial (note 2) ........... C 40 c to 85 c industrial ........................................... C 40 c to 85 c storage temperature range ................. C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c maximum junction temperature .......................... 125 c order part number order part number ltc1682cms8 ltc1682cms8-3.3 ltc1682cms8-5 ltc1682ims8 ltc1682ims8-3.3 ltc1682ims8-5 ltc1682cs8 ltc1682cs8-3.3 ltc1682cs8-5 ltc1682is8 ltc1682is8-3.3 ltc1682is8-5 ms8 part marking lter ltgt ltgv lthm ltgu ltgw consult factory for military grade parts. s8 part marking parameter conditions min typ max units v in operating voltage ltc1682 l 1.8 4.4 v ltc1682-3.3 l 2 4.4 v ltc1682-5 l 2.7 4.4 v i vin shutdown current shdn = 0v l 15 m a i vin operating current i out = 0ma, burst mode tm operation 0 c to 70 c l 150 250 m a C40 c to 85 c l 150 300 m a fb input current ltc1682, fb = 1.235v l C50 50 na fb voltage ltc1682 l 1.210 1.235 1.260 v regulated output voltage ltc1682-3.3, i out = 1ma l 3.23 3.30 3.37 v ltc1682-5, i out = 1ma l 4.9 5.0 5.1 v v out temperature coefficient 50 ppm charge pump oscillator frequency i out > 200 m a, v in = 1.8v to 4.4v l 480 550 620 khz burst mode is a trademark of linear technology corporation. t jmax = 125 c, q ja = 120 c/ w t jmax = 125 c, q ja = 140 c/ w 1682i 1682i33 1682i5 1682 168233 16825 absolute m axi m u m ratings w ww u 1 2 3 4 v out shdn filt/fb* gnd 8 7 6 5 cpo c + v in c top view ms8 package 8-lead plastic msop *pin3 = filt for ltc1682-3.3/ltc1682-5 = fb for ltc1682 top view s8 package 8-lead plastic so 1 2 3 4 8 7 6 5 v out shdn filt/fb* gnd cpo c + v in c *pin3 = filt for ltc1682-3.3/ltc1682-5 = fb for ltc1682 package/order i n for m atio n uu w electrical characteristics
3 ltc1682/ltc1682-3.3/ltc1682-5 parameter conditions min typ max units cpo (charge pump output) v in = 1.8v, i out = 10ma l 18 30 w output resistance v in = 3v, i out = 10ma l 13 20 w v in = 4.4v, i out = 10ma l 11 17 w v out dropout voltage (note 3) ltc1682, i out = 10ma, v out = 2.57v (note 5) l 100 160 mv ltc1682/ltc1682-3.3, i out = 10ma, v out = 3.3v l 75 120 mv ltc1682/ltc1682-5, i out = 10ma, v out = 5v l 50 90 mv v out enable time i out = 10ma 2 ms v out output noise voltage ltc1682 i out = 10ma, 10hz f 100khz, v out = 5v 88 m v rms i out = 10ma, 10hz f 2.5mhz, v out = 5v 800 m v p-p ltc1682-3.3 i out = 10ma, 10hz f 100khz, c filt = 1nf 58 m v rms i out = 10ma, 10hz f 2.5mhz, c filt = 1nf 500 m v p-p ltc1682-5 i out = 10ma, 10hz f 100khz, c filt = 1nf 64 m v rms i out = 10ma, 10hz f 2.5mhz, c filt = 1nf 600 m v p-p v out line regulation v in = 3v to 4v, i out = 0ma (note 6) l 520 mv v out load regulation i out = 1ma to 10ma l 310 mv i out = 1ma to 50ma (note 4) 10 mv v out shutdown resistance shdn = 0v, resistance measured to ground, v in = 1.8v l 150 350 w shdn = 0v, resistance measured to ground, v in = 4.4v l 50 150 w shdn input threshold v in = 1.8v to 4.4v l 0.4 1 1.6 v shdn input current shdn = v in l C1 1 m a shdn = 0v l C1 1 m a note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: the ltc1682c is guaranteed to meet specified performance from 0 c to 70 c and is designed, characterized and expected to meet these extended temperature limits, but is not tested at C 40 c and 85 c. the ltc1682i is guaranteed to meet the extended temperature limits. note 3: dropout voltage is the minimum input/output voltage required to maintain regulation at the specified output current. in dropout the output voltage will be equal to: v cpo C v dropout (see figure 4). note 4: operating conditions are limited by maximum junction temperature. the regulated output specification will not apply for all possible combinations of input voltage and output current. when operating at maximum input voltage, the output current range may be limited. when operating at maximum output current, the input voltage range may be limited. note 5: limited by the ldo disable switch point of 1.45v in . note 6: the ltc1682 is set to 5v. the feedback current is 25 m a. the l denotes specifications that apply over the full operating temperature range, otherwise specifications are t a = 25 c. shdn = v in = 3v; c1 = 0.22 m f; c2, c3, c4 = 4.7 m f, unless otherwise noted. electrical characteristics
4 ltc1682/ltc1682-3.3/ltc1682-5 oscillator frequency vs temperature operating current vs v in (no load) v out transient response v out 200 m v/div 100 m s/div 1682 g04 c cpo = c out = 4.7 m fv out = 5v i out = 10ma t a = 25 c v in = 3v c filt = 1nf ltc1682-5 output noise (bw = 10hz to 2.5mhz) shutdown to enable timing min and max v cpo vs v in cpo output resistance vs v in enable to shutdown timing typical perfor a ce characteristics uw v in (v) 1.5 r cpo ( ) 35 30 25 20 15 10 5 2.0 2.5 3.0 3.5 1682 g01 4.0 4.5 t a = 25 c c1 = 0.22 f i out = 10ma v in (v) 1.5 v cpo (v) 9 8 7 6 5 4 3 2.0 2.5 3.0 3.5 1682 g02 4.0 4.5 v cpo = 2(v in ) (a) (a) the maximum generated no load cpo voltage (b) the minimum allowable cpo voltage, at full load, to ensure that the ldo is not disabled (b) v cpo = 1.45(v in ) t a = 25 c time ( s) 050 ? v out (mv) i out (ma) 100 200 150 250 300 1682 g02 10 5 0 ? ?0 15 10 5 0 t a = 25 c v in = 3v v out = 4v c out = 10 f 200 s/div shdn (v) v out (v) 2 0 4 3 2 1 0 1682 g05 t a = 25 c v in = 3v v out = 4v i out = 10ma c cpo = c out = 10 f 1ms/div shdn (v) v out (v) 2 0 4 3 2 1 0 1682 g06 no load t a = 25 c v in = 3v v out = 4v c out = 10 f temperature ( c) ?0 565 560 555 550 545 540 535 530 25 75 1682 g07 ?5 0 50 100 125 oscillation frequency (khz) v in = 3v v in (v) operating current ( m a) 220 200 180 160 140 120 100 80 60 1682 g08 1.5 2.0 2.5 3.0 3.5 4.0 4.5 t a = 25 c ltc1682-3.3 ltc1682-5 ltc1682
5 ltc1682/ltc1682-3.3/ltc1682-5 v out (pin 1): low noise regulated output voltage. v out should be bypassed with a 3 2 m f low esr capacitor as close to the pin as possible for best performance. the v out range is 2.5v to 5.5v. shdn (pin 2): shutdown input. a logic low on the shdn pin puts the part in shutdown mode. a logic high enables the part. to continuously enable the part connect shdn to v in . when the part is in shutdown, v out will be connected to ground via a 100 w switch and cpo will be high impedance disconnected from v in . fb (pin 3) (ltc1682): the voltage on this pin is compared to the internal reference voltage (1.235v) by the error amplifier to keep the output in regulation. an external resistor divider is required between v out and fb to adjust the output voltage. filt (pin 3) (ltc1682-3.3/ltc1682-5): this pin is used to filter the internal voltage reference. typically a 1nf capacitor is connected from filt to ground. gnd (pin 4): system ground. c C (pin 5): flying capacitor negative input. v in (pin 6): input voltage, 1.8v to 4.4v. v in should be bypassed with a 3 2 m f low esr capacitor as close to the pin as possible for best performance. a minimum capaci- tance value of 0.1 m f is required. c + (pin 7): flying capacitor positive input. cpo (pin 8): unregulated charge pump output voltage. approximately 1.95(v in ) at low loads. bypass with a 3 2 m f low esr capacitor. if a minimum v out enable time is required, the cpo capacitor should be 2 the v out capacitor. pi n fu n ctio n s uuu temperature ( c) ?0 v out voltage (v) 5.030 5.020 5.010 5.000 4.990 3.340 3.330 3.320 3.310 3.300 3.290 1.238 1.240 1.236 1.234 1682 g09 ?5 25 50 125 0 75 100 ltc1682 ltc1682-3.3 ltc1682-5 v in = 3v i out = 10ma v out voltage vs temperature typical perfor a ce characteristics uw output current (ma) 0 v out voltage (v) 4.994 4.993 3.300 4.997 4.996 4.995 5.000 4.999 4.998 15 25 40 45 50 1682 g10 3.299 3.298 3.297 3.296 3.295 3.294 510 20 30 35 v in = 3.3v t a = 25 c ltc1682-5 ltc1682-3.3 v out voltage vs output current
6 ltc1682/ltc1682-3.3/ltc1682-5 figure 1. ltc1682 block diagram block diagra s m w + + + charge pump and slew control 550khz oscillator power- on reset sd regen enb regen fb clk1 reg b shdn c1 0.22 f c + v in v in v ref = 1.235v c 275k c3 4.7 f 38k 328k 1:100 1 a/2 a sd ldo 100 enb gnd cpo v out 1682 f01 c2 4.7 f r1 r2 c4 4.7 f 8 5 7 6 2 34 1
7 ltc1682/ltc1682-3.3/ltc1682-5 + + + charge pump and slew control 550khz oscillator power- on reset sd filt regen enb regen clk1 reg b shdn c1 0.22 f c + v in v in 200k rb 200k ra 120k/65.5k v ref = 1.235v c 275k c3 4.7 f 1nf 38k 328k 1:100 1 a/2 a sd 100 enb gnd cpo v out 1682 f02 c2 4.7 f c4 4.7 f 8 5 7 6 2 3 4 1 ldo figure 2. ltc1682-3.3/ltc1682-5 block diagram block diagra s m w
8 ltc1682/ltc1682-3.3/ltc1682-5 operation the ltc1682 uses a switched-capacitor charge pump to generate a cpo voltage of approximately 2(v in ). cpo powers an internal low dropout linear regulator that sup- plies a regulated output at v out . internal comparators are used to sense cpo and v in voltages for power-up condi- tioning. the output current is sensed to determine the charge pump operating mode. a trimmed internal bandgap is used as the voltage reference and a trimmed internal oscillator is used to control the charge pump switches. the charge pump is a doubler configuration that uses one external flying capacitor. when enabled, a 2-phase nonoverlapping clock controls the charge pump switches. at start-up, the ldo is disabled and the load is removed from cpo. when cpo reaches 1.75(v in ) the ldo is enabled. if cpo falls below 1.45(v in ) the ldo will be disabled. generally, the charge pump runs open loop with continuous clocking for low noise. if cpo is greater than 1.95(v in ) and i out is less than 100 m a, the charge pump will operate in burst mode operation for increased effi- ciency but slightly higher output noise. in burst mode operation, the clock is disabled when cpo reaches 1.95(v in ) and enabled when cpo droops by about 100mv. the switching frequency is precisely controlled to ensure that the frequency is above 455khz and at the optimum rate to ensure maximum efficiency. the switch edge rates are also controlled to minimize noise. the effective output resistance at cpo is dependent on the voltage at v in , cpo and the junction temperature. a low esr capacitor of 3 2 m f should be used at cpo for minimum noise. the ldo is used to filter the ripple on cpo and to set an output voltage independent of cpo. v out is set by an external or internal resistor divider. the ldo requires a capacitor on v out for stability and improved load transient response. a low esr capacitor of 3 2 m f should be used. output voltage selection the ltc1682-3.3/ltc1682-5 versions have internal resistor networks to set the regulated output voltage. the ltc1682 output voltage is set using an external resistor divider (see figure 3). the output voltage is determined using the following formula: v out = 1.235v(1 + r1/r2) the output voltage range is 2.5v to 5.5v. maximum v out and i out calculations the maximum available output voltage and current can be calculated based on the open circuit cpo voltage, the dropout voltage of the ldo and the effective output resistance of the charge pump. the open circuit cpo voltage is approximately 2(v in ) (see figure 4). figure 3. powering an auxiliary regulator from cpo applicatio n s i n for m atio n wu u u r1 56k r2 18k c1 0.22 f c4 4.7 f 1682 f03 v in 3.6v c3 4.7 f 5.1v v ripple = 800 v p-p 1 2 3 4 8 7 6 5 v out shdn fb gnd cpo c + v in c ltc1682 c2 4.7 f in 3.3v out gnd c5 external ldo v out = 1.235v(1 + r1/r2) + 2v in r cpo c cpo v cpo v out i load 1682 f04 r dropout v dropout + figure 4. equivalent circuit
9 ltc1682/ltc1682-3.3/ltc1682-5 the following formula can be used to find the maximum output voltage that may be programmed for a given minimum input voltage and output current load: v out(max) = (2)(v in(min) ) C (i out )(r cpo ) C v dropout with the condition that (i out )(r cpo ) < 0.55v in . example: v in(min) = 3v i out = 10ma r cpo(max) = 20 w max unloaded cpo voltage = 6v loaded cpo voltage = 6v C (10ma)(20 w ) = 5.8v v dropout(max) = 0.08v v out(max) = (6v) C (0.2v) C (0.08v) = 5.72v v out < 5.5v and (i out )(r cpo ) < 0.55v in , 0.2v < 1.65v. for minimum noise applications, the ldo must be kept out of dropout to prevent cpo noise from coupling into v out . external cpo loading the cpo output can drive an external load (an ldo, for example). the current required by this additional load will reduce the available current from v out . if the external load requires 5ma, then the maximum available current at v out will be reduced by 5ma. short-circuit and thermal protection v out can be shorted to ground indefinitely. internal cir- cuitry will limit the output current. if the junction tempera- ture exceeds 150 c, the part will shut down. excessive power dissipation due to heavy loads will also cause the part to shut down when the junction temperature exceeds 150 c. the part will become enabled when the junction temperature drops below 140 c. if the fault condition remains in place, the part will cycle between the shutdown and enabled states. capacitor selection for best performance it is recommended that low esr capacitors be used for c2, c3 and c4 in figure 1 to reduce noise and ripple. c2 must be 3 2 m f and c3 must be equal to or greater than c2. c4 is dependent on the source impedance. the charge pump demands large applicatio n s i n for m atio n wu u u instantaneous currents which may induce ripple onto a common voltage rail. c4 should be 3 2 m f and a spike reducing resistor of 2.2 w may be required between v in and the supply. a low esr ceramic capacitor is recommended for the flying capacitor c1 with a value of 0.22 m f. at low load or high v in a smaller capacitor could be used to reduce ripple on cpo which would reflect as lower ripple on v out . if a minimum enable time is required, the cpo output filter capacitor should be at least 2 the v out filter capacitor. when the ldo is first enabled, the cpo capacitor will dump a large amount of charge into the v out capacitor. if the drop in the cpo voltage falls below 1.45(v in ), the ldo will be disabled and the cpo voltage will have to charge up to 1.75(v in ) to enable the ldo. the resulting cycling extends the enable time. a 1nf filter capacitor for the ltc1682-3.3/ltc1682-5 should be connected between the filt pin and ground for optimum noise performance. output ripple the output noise and ripple on cpo includes a spike component from the charge pump switches and a droop component which is dependent on the load current and the value of c3. the charge pump has been carefully designed to minimize the spike component; however, low esr capacitors are essential to reduce the remaining spike energy effect on the cpo voltage. c3 should be increased for high load currents to minimize the droop component. ripple components on cpo are greatly reduced at v out by the ldo; however, c2 should also be a low esr capacitor to improve filtering of the cpo noise. shutdown when shdn pin is pulled low (< 0.4v), the part will be in shutdown, the supply current will be < 5 m a and v out will be connected to ground through a 100 w switch. in addi- tion, cpo will be high impedance and disconnected from v in . if shutdown is not required, connect shdn to v in which will continuously enable the part.
10 ltc1682/ltc1682-3.3/ltc1682-5 applicatio n s i n for m atio n wu u u general layout considerations due to the high switching frequency and high transient currents produced by the device, careful board layout is a must. a clean board layout using a ground plane and short connections to all capacitors will improve noise perfor- mance and ensure proper regulation (figure 5). the filt pin on the ltc1682-3.3/ltc1682-5 is a high impedance node. leakage currents at this pin must be minimized. measuring output noise measuring the ltc1682 low noise levels requires care. figure 6 shows a test setup for taking the measurement. good connection and signal handling technique should yield about 500 m v p-p over a 2.5mhz bandwidth. the noise measurement involves ac coupling the ltc1682 output into the test setups input and terminating this connection with 50 w . coaxial connections must be maintained to preserve measurement integrity. power-on reset upon initial power-up, a power-on reset circuit ensures that the internal functions are correctly initialized when power is applied. once v in reaches approximately 1v, the power-on reset circuit will enable the part as long as the shdn pin is held high. thermal considerations the power handling capability of the device will be limited by the maximum rated junction temperature (125 c). the device power dissipation p d = i out (2v in C v out ) + v in (4ma). the device dissipates the majority of its heat through its pins, especially gnd (pin 4). thermal resis- tance to ambient can be optimized by connecting gnd to a large copper region on the pcb, which serves as a heat sink. applications which operate the ltc1682 near maxi- mum power levels should maximize the copper area at all pins except c + , c C and filt/fb and ensure that there is some airflow over the part to carry away excess heat. 1 2 3 4 ltc1682-3.3/5 8 7 6 5 c1 v out v in 1682 f05 c3 c2 gnd shdn c4 c filt ltc1682 demo board oscilloscope bandwidth filter connect bnc and r load ground to the output capacitor ground terminal e5 place coupling capacitor in shielded box with coaxial connector coupling capacitor bnc cables or couplers battery or low noise dc power supply v out r load r* r* *50 terminations hp-11048c or equivalent r* note: keep bnc connections as short as possible place bandwidth filter components in shielded box with coaxial connectors preamplifier 1822 input 1682 f06 + 20db figure 6. ltc1682 noise measurement test setup figure 5
11 ltc1682/ltc1682-3.3/ltc1682-5 dimensions in inches (millimeters) unless otherwise noted. package descriptio n u ms8 package 8-lead plastic msop (ltc dwg # 05-08-1660) typical applicatio n u c1 0.22 f c filt 1nf 1682 ta03 v in 3.3v c2 4.7 f 3.3v 1 2 shutdown 3 4 8 7 6 5 v out shdn filt gnd cpo c + v in c ltc1682-3.3 c3 4.7 f c4 4.7 f v ripple = 500 v p-p 3.3v to low noise 3.3v converter s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) msop (ms8) 1197 * dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.006" (0.152mm) per side ** dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.006" ( 0.152mm ) per side 0.021 0.006 (0.53 0.015) 0 ?6 typ seating plane 0.007 (0.18) 0.040 0.006 (1.02 0.15) 0.012 (0.30) ref 0.006 0.004 (0.15 0.102) 0.034 0.004 (0.86 0.102) 0.0256 (0.65) typ 12 3 4 0.192 0.004 (4.88 0.10) 8 7 6 5 0.118 0.004* (3.00 0.102) 0.118 0.004** (3.00 0.102) 1 2 3 4 0.150 ?0.157** (3.810 ?3.988) 8 7 6 5 0.189 ?0.197* (4.801 ?5.004) 0.228 ?0.244 (5.791 ?6.197) 0.016 ?0.050 0.406 ?1.270 0.010 ?0.020 (0.254 ?0.508) 45 0 ?8 typ 0.008 ?0.010 (0.203 ?0.254) so8 0996 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) typ dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side * **
12 ltc1682/ltc1682-3.3/ltc1682-5 1286f lt/tp 0799 4k ? printed in usa ? linear technology corporation 1999 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com related parts part number description comments ltc1340 low noise, voltage-boosted varactor driver generates 5v varactor drive from 3v supply ltc1517-x micropower, regulated charge pump doubler in sot-23 i cc = 6 m a; short circuit/thermal protected lt1521 300ma low dropout regulator micropower; good transient response ltc1522 micropower, regulated 5v charge pump ultralow power: typical operating i cc = 6 m a lt1761 series 100ma low noise ldo regulator in sot-23 i cc = 20 m a; 20 m v rms output noise typical applicatio n u wide input range vco supply (v in > 4.4v) shutdown c1 0.22 f c4 4.7 f 3v (required for start-up) q1 fmmt3904 1682 ta04 v in 3v to 6v c3 4.7 f 5v low noise 1 2 3 4 8 7 6 5 v out shdn filt gnd cpo c + v in c r1 470 ltc1682-5 c2 4.7 f c filt 1nf d1 1n4148 vco

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