1 description ltc 6947 ultralow noise and spurious fractional-n synthesizer demonstration circuit 1846a features the lt c ? 6947, an ultralow noise and spurious fractional-n synthesizer. dc1846a provides 50 sma connectors for the reference frequency (ref+) and the two single-ended rf outputs (rf+ and rfC). l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks and fracnwizard is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. a dc590 usb serial controller board is used for spi com - munication with the LTC6947, controlled by the supplied fracnwizard? software. design files for this circuit board are available at http://www .linear.com/demo figure 1. dc1846a connections ? ? ? ? ? frequency ? reference ? input, ? sma ? external ? vco ? input, ? sma ? differential ? output ? of ? vco ? buffer, ? sma ? 3.3 ? v ? dc ? supply, ? banana ? jacks ? 5 ? v ? dc ? supply, ? banana ? jacks ribbon ? cable ? connection ? to ? dc590 ? active ? loop ? filter ? op \ amp ? dc ? supply, ? turret ? u3 ? (vco) ? dc ? supply, ? turret ? u4 ? (vco ? or ? vcxo) ? dc ? supply, ? turret ? enable ? (pin ? 2) ? of ? u4 ? (vco ? or ? vcxo), ? turret ? dc1846af demo manual dc1846a
2 quick start procedure the dc1846a is easy to set up to evaluate the performance of the LTC6947. follow the procedure below. the dc590 and fracnwizard application are required to control the dc1846a through a personal computer (pc). dc590 configuration place the dc590 jumpers in the following positions (refer to figure 2): jp4: ee C must be in the en position. jp5: iso C on must be selected. jp5: sw C on must be selected. jp6: vccio C 3.3v must be selected. this sets the spi port to 3.3v operation. connect the dc590 to one of your computers usb ports with the included usb cable. fracnwizard installation the fracnwizard software is used to communicate with the LTC6947 synthesizer. it uses the dc590 to translate between usb and spi- compatible serial communica - tions formats. it also includes advanced pll design and simulation capabilities. the following are the fracnwizard system requirements: ? windows operating system: windows xp, windows 2003 server, windows vista, windows 7 ? microsoft .net 3.5 sp1 or later ? windows installer 3.1 or later ? linear technologys dc590 hardware figure 2. dc590 jumper and connector locations ? ? jp6 ? jumpers ? j4, ? ribbon ? cable ? connection ? to ? the ? dc1846 ? jp5 ? jumpers ? jp4 ? jumper ? j3, ? usb ? connection ? to ? pc ? dc1846af demo manual dc1846a
3 quick start procedure download the fracnwizard setup file at: www.linear.com/fracnwizard run the fracnwizard setup file and follow the instructions given on the screen. the setup file will verify and/or install microsoft .net and install the fracnwizard. refer to the help menu for software operation. dc1846a configuration 1. connect a 100mhz reference frequency source (at j2) and signal analyzers to rf+ and/or rfC (at j6 and/or j7) using the sma connectors (see figure 1 and the typical dc1846a requirements and characteristics table). be sure to terminate any unused rf output with 50, or poor spurious performance may result. 2. choose the mute jumper setting: jp1: gnd/3.3v - mute position. select gnd to mute the rf output, 3.3v to unmute. 3. connect the gnd, 3.3v, 5v banana jacks and the v+vco turret to a power supply and apply power (see figure 1 and the typical dc1846a requirements and characteristics table). 4. connect the dc590 to the dc1846a with the provided ribbon cable. 5. run the fracnwizard application. 6. in fracnwizard, click file -> load settings and point to the LTC6947_100mhz.fracnset file. the red led on the dc1846a should turn on indicating that the loop is locked at 2415mhz. figure 3. fracnwizard screenshot dc1846af demo manual dc1846a
4 quick start procedure dc1846a reconfiguration troubleshooting if the red led does not illuminate, follow the instructions below: 1. verify that you are able to communicate with the dc1846a . the bottom status line in fracnwizard should read LTC6947 and comm enabled. refer to fracnwizards troubleshoot and help if not. 2. verify that the 3.3v, 5v and v+vco have the correct voltages on them and that the reference frequency is applied to the ref+ sma input. if the red led is on but you cannot detect an rf output, make sure the dc 1846 a jumper jp 1 is at the 3.3 v position . run help -> troubleshoot in fracnwizard if the problem is not resolved. the dc1846a is flexible and allows the use of a variety of vcos and the choice to employ either an active or pas - sive loop filter. the following covers the hardware recon- figuration of the dc1846a. refer to fracnwizards help and the LTC6947 data sheet to better understand how to change programmed parameters on the dc1846a. installing different tunable devices the dc1846a permits the use of different tunable oscil - lators, such as vcos and vcxos. there are two different oscillator footprints on the board : u 3, which accommodates the popular 0.5 0.5 in. package, and u4, which accom - modates another common 14mm 9 mm package with four or six pins. an external connectorized vco can also drive the LTC6947 through j5. table 1 gives options to customize the dc1846s vcos. when using an active loop filter, an additional pole is required in the loop filter to limit the op amps noise contribution to the vco phase noise. selecting loop filter type the dc1846a can use either an active or a passive loop filter, depending upon the application. some vco tuning voltage ranges are greater than the LTC6947 charge pump voltage range (refer to the LTC6947 data sheet). in such cases, an active loop filter using an op amp can deliver the required tuning voltage. table 2 summarizes these options. fracnwizard helps determine the component values listed in this table. table 1. oscillator options tunable device selection components resistor for additional pole capacitor for additional pole power enable pin or remarks u3* c26 ? 100pf, depopulate r2_f3, c25 and c28* r2_f2 = 0 for passive loop filter* r2_f2 = 75 for active loop filter c3_f2 = open for passive loop filter* pick c3_f2 such that 1/(2 r2_f2 c3_f2) ? 15 the loop bandwidth in hz for active loop filter determined by u3 device power supply specification, up to 24v applied to v+vco turret u4 c28 ? 100pf, depopulate r2_f2, c25 and c26 r2_f3 = 0 for passive loop filter r2_f3 ? 75 for active loop filter c3_f3 = open for passive loop filter pick c3_f3 such that 1/(2 r2_f3 c3_f3) ? 15 the loop bandwidth in hz for active loop filter determined by u4 device power supply specification, up to 24v applied to v+vcxo turret use en turret to control pin 2 of u4 if needed external c25 ? 100pf, r15 = 0 ohms, depopulate r13, c26 and c28 - - - selection components are for an active loop filter. connect the external vco output to j5. use cpgain to tune the external device. *these are the default installation options. for the dc 1846a-a, u3 is populated with cvco55cc-2328-2536 from crystek dc1846af demo manual dc1846a
5 typical dc1846a requirements and characteristics dc1846a reconfiguration table 2. loop filter options loop filter type selection resistors rz from fracnwizard ci from fracnwizard cp from fracnwizard power cpinv box, system tab in fracnwizard passive r14 and r16 = 0, depopulate r13 and r15 rz_p ci1_p in parallel with ci2_p cp_p none unchecked active r13 (except when using an external vco) and r15 = 0, depopulate r14 and r16 rz_a ci1_a in parallel with ci2_a cp_a determined by the maximum allowed tune voltage of the populated vco (u3 or u4), up to 24v applied to v+oa turret checked parameter input or output physical location details 3.3v power supply input j9 and j10 banana jacks low noise and spur-free 3.3v, 103ma** 5v charge pump power supply input j11 and j12 banana jacks low noise and spur-free 5v, 22ma** 5v vco power supply input v+vco turret low noise and spur-free 5v, 30ma** ref+, reference frequency input j2 sma connector low noise 100mhz**, 6 to 10dbm into 50, see note rf+ and rfC tw o outputs j6 and j7 sma connectors*** 2328 to 2536mhz** in 190.7hz** steps, 0dbm loop bandwidth C set by loop filter component values 30.7khz** **these values are for the dc1846a_100mhz.fracnset file and included vco. ***any unused rf output must be terminated with 50, or poor spurious performance may result. note: a low noise 100mhz reference frequency, such as the wenzel 501-04516d ocxo, is recommended. if using a different frequency, make sure to update the fref and r_div boxes under the system tab in fracnwizard so that fpfd is still 50mhz. for example, if a 250mhz clock is used, fref should be changed to 250mhz and r_div to 5. ref bst and filt under the system tab in fracnwizard might need to be changed if the reference frequency and/or power is different than what is recommended in the table above. more information can be found in the LTC6947 data sheet. dc1846af demo manual dc1846a
6 parts list item qty reference part description manufacturer / part number 1 0 ci1_a, c3_f2, c3_f3, cp_a, c14 cap, 0603 opt 2 6 ci1_p, c5, c12, c13, c18, c31 cap, 0603 1.0f 10% 10v x7r taiyo yuden, lmk107b7105ka-t 3 0 ci2_p, ci2_a cap, 1206 opt 4 1 cp_p cap, 0603 47nf 10% 50v x7r avx 06035c473 kat 2a 5 3 c1, c19, c33 cap, 7361 47f 10% 35v, 7361 avx tajv476k035rnj 6 3 c2, c21, c35 cap, 0805 0.1f 10% 50v x7r avx 08055c104 kat 2a 7 2 c3, c16 cap, 7343 330f 10% 10v tant avx tpme337k010r0035 8 9 c4, c6, c11, c30, c36, c39, c41, c43, c44 cap, 0402 0.1f 10% 10v x7r taiyo yuden, lmk105b7104kv-f 9 1 c7 cap, 7343 47f 10% 20v tant avx tajd476k020rnj 10 2 c8, c15 cap, 0402 1f 10% 16v x5r tdk c1005x5r1c105k 11 4 c17, c23, c34, c45 cap, 0402 0.01f 10% 16v x7r avx 0402yc103 kat 2a 12 1 c2_f1 cap, 0603 33nf 10% 50v x7r avx 06035c333 kat 2a 13 0 c25, c28 cap, 0402 opt 14 4 c26, c29, c37, c38 cap, 0402 100pf 10% 16v npo avx 0402ya 101 kat 2a 15 1 d1 led, red panasonic ln1251ctr 16 10 e3, e6, e11-e18 turret mill-max 2501-2-00-80-00-00-07-0 17 1 jp1 header, 3-pin 2mm samtec tmm-103-02-l-s 18 4 j2, j5, j6, j7 conn, sma 50 edge-launch e.f. johnson, 142-0701-851 19 0 j3, j4 conn, sma 50 straight opt 20 4 j9, j10, j11, j12 jack, banana keystone 575-4 21 1 j13 header, 7 dual pin, 2mm molex 87831-1420 22 0 l1 ind, 0402 opt 23 2 l2, l3 ind, 0402 68nh 5% coilcraft 0402hph-68 nxjlw 24 1 l1_f1 res, 0805, 0 jumper vishay crcw08050000z0ea 25 0 l1_f2, l1_f3 ind, 0805 opt 26 2 r1_f1, rz_p res, 0603 21 1% 1/10w vishay crcw060321r0fked 27 5 r1, r2, r11, r20, r26 res, 0402 4.99k 1% 1/16w vishay crcw04024k99fked 28 1 r4 res, 0402 330 1% 1/16w nic nrc04f3300trf 29 1 r5 res, 0402 51.1 1% 1/10w vishay crcw040251r1fked 30 4 r7, r8, r18, r19 res, 0402 200k 1% 1/16w vishay crcw0402200kfked 31 4 r9, r14, r16, r2_f2 res, 0603 0 jumper vishay crcw06030000z0ea 32 3 r12, r21, r22 res, 0402 100 5% 1/16w vishay crcw0402101rjked 33 0 r13, r15, r2_f3, rz_a, r31 res, 0603 opt 34 0 r23, r24 res, 0402 opt 35 5 r25, r27, r28, r29, r30 res, 0402 0 jumper vishay crcw04020000z0ea 36 1 u1 ic, qfn28iufd-4x5 linear tech. LTC6947iufd 37 1 u2 ic, low noise amp, so8 linear tech. lt1678is8#pbf 38 1 u3 ic, vco crystek , cvco55cc-2328-2536 39 0 u4 ic, crystal oscillator opt 40 2 u5, u10 ic, dual buffer, sc70 fairchild semi nc7wz17p6x 41 1 u8 i.c., serial eeprom, tssop8 microchip, 24lc025-i /st 42 1 u11 ic, dual transceiver, sot363 nxp 74 lv c 1t45gw 43 1 shunt on jp1 (2&3) shunt, 2mm ctrs samtec 2sn-bk-g dc1846af demo manual dc1846a
7 schematic diagram 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 a a b b c c d d 3.3v gnd mute vco 2328 - 2536 mhz assy u3 * -a cvco55cc-2328-2536 note: unless otherwise specified 1. all resistors are in ohms, 0402 2. all capacitors are in microfarads, 0402. cs sclk sdi sdo 3.3v 3.3v 3.3v 3.3v 3.3v 5v v+vco v+vcxo 3.3v v+vco 3.3v 5v 5v v+oa 3.3v revision history description date approved eco rev michel a. production 2 01-28-14 __ revision history description date approved eco rev michel a. production 2 01-28-14 __ revision history description date approved eco rev michel a. production 2 01-28-14 __ size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 01/28/2014, 12:25 pm 12 n/a LTC6947iufd demo circuit 1846a michel a. kim t. ultralow noise and spurious fractional-n synthesizer size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 01/28/2014, 12:25 pm 12 n/a LTC6947iufd demo circuit 1846a michel a. kim t. ultralow noise and spurious fractional-n synthesizer size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 01/28/2014, 12:25 pm 12 n/a LTC6947iufd demo circuit 1846a michel a. kim t. ultralow noise and spurious fractional-n synthesizer + c16 330uf 7343 10v + c16 330uf 7343 10v c3_f2 opt 0603 c3_f2 opt 0603 c3_f3 opt 0603 c3_f3 opt 0603 c18 1uf 0603 c18 1uf 0603 e18 en e18 en c15 1uf c15 1uf c23 0.01uf c23 0.01uf j12 gnd j12 gnd c31 1uf 0603 c31 1uf 0603 e12 cpgain e12 cpgain r16 0 0603 r16 0 0603 jp1 jp1 r14 0 0603 r14 0 0603 c17 0.01uf c17 0.01uf c8 1uf c8 1uf j3 cp opt j3 cp opt r25 0 r25 0 rz_p 21 0603 rz_p 21 0603 + c33 35v 47uf 7361 + c33 35v 47uf 7361 j7 rf- j7 rf- e13 v+vco e13 v+vco c45 0.01uf c45 0.01uf c2 0.1uf 35v 0805 c2 0.1uf 35v 0805 r1 4.99k r1 4.99k l1_f3 opt 0805 l1_f3 opt 0805 r2_f3 opt 0603 r2_f3 opt 0603 j5 ext vco in j5 ext vco in ci2_a opt 1206 ci2_a opt 1206 j4 cpgain opt j4 cpgain opt c11 0.1uf c11 0.1uf c12 1uf 0603 c12 1uf 0603 r29 0 r29 0 r2 4.99k r2 4.99k c6 0.1uf c6 0.1uf e3 cp e3 cp j9 3.3v j9 3.3v r31 opt 0603 r31 opt 0603 r5 51.1 r5 51.1 c38 100pf c38 100pf r30 0 r30 0 e15 v+vcxo e15 v+vcxo + c1 35v 47uf 7361 + c1 35v 47uf 7361 cp_a opt 0603 cp_a opt 0603 r23 opt r23 opt c21 0.1uf 35v 0805 c21 0.1uf 35v 0805 d1 ln1251ctr red d1 ln1251ctr red 2 1 c29 100pf c29 100pf c4 0.1uf c4 0.1uf c5 1uf 0603 c5 1uf 0603 ci2_p opt 1206 ci2_p opt 1206 a b u2 lt1678is8 a b u2 lt1678is8 outa 1 -ina 2 +ina 3 v- 4 +inb 5 -inb 6 outb 7 v+ 8 c25 opt c25 opt ci1_a opt 0603 ci1_a opt 0603 r27 0 r27 0 c30 0.1uf c30 0.1uf e11 v+oa e11 v+oa ci1_p 1uf 0603 ci1_p 1uf 0603 c2_f1 33nf 0603 c2_f1 33nf 0603 r15 opt 0603 r15 opt 0603 e17 gnd e17 gnd j11 5v j11 5v u4 opt u4 opt vtune 1 en 2 gnd 3 rfout 4 nc 5 vcc 6 j6 rf+ j6 rf+ r24 opt r24 opt l2 68nh 0402hph-68nxjl l2 68nh 0402hph-68nxjl u1 LTC6947iufd qfn28ufd-4x5 u1 LTC6947iufd qfn28ufd-4x5 stat 2 vco- 15 cs 3 mute 9 sdi 5 v+d 8 ldo 7 rf+ 12 rf- 11 gnda 10 sclk 4 vco+ 16 gndb 17 v+rf 13 ref+ 1 bb 14 sdo 6 gndc 18 gndd 19 gnde 20 gndf 21 gndg 22 v+vco 23 gndh 24 v+cp 25 cp 26 v+ref 27 ref- 28 gnd 29 r13 opt 0603 r13 opt 0603 u3 * u3 * gnd 1 vtune 2 gnd 3 gnd 4 gnd 5 gnd 6 gnd 7 gnd 8 gnd 9 rfout 10 gnd 11 gnd 12 gnd 13 vcc 14 gnd 15 gnd 16 c35 0.1uf 35v 0805 c35 0.1uf 35v 0805 c28 opt c28 opt + c3 330uf 7343 10v + c3 330uf 7343 10v c34 0.01uf c34 0.01uf l1_f1 0 0805 l1_f1 0 0805 e6 status e6 status l1_f2 opt 0805 l1_f2 opt 0805 c14 opt 0603 c14 opt 0603 j2 ref+ j2 ref+ e14 gnd e14 gnd l1 opt l1 opt cp_p 47nf 0603 cp_p 47nf 0603 c26 100pf c26 100pf + c19 35v 47uf 7361 + c19 35v 47uf 7361 l3 68nh 0402hph-68nxjl l3 68nh 0402hph-68nxjl r4 330 r4 330 + c7 20v 47uf 7343 + c7 20v 47uf 7343 rz_a opt 0603 rz_a opt 0603 j10 gnd j10 gnd c13 1uf 0603 c13 1uf 0603 r1_f1 21 0603 r1_f1 21 0603 r28 0 r28 0 e16 gnd e16 gnd c37 100pf c37 100pf r2_f2 0 0603 r2_f2 0 0603 dc1846af demo manual dc1846a
8 schematic diagram note: the buffers shown on sheet 2 of 2 of the schematic are used to protect the LTC6947 when connected to the dc590 before the LTC6947 is powered up. there is no need for such circuitry if the spi bus is not powered before powering up the LTC6947. the eeprom is for identification and is not needed to program the LTC6947. a a b b c c d d e e 4 4 3 3 2 2 1 1 0603 dc590b spi interface note: eeprom for board identification cs sclk sdi sdo 3.3v 3.3v 3.3v 3.3v size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 01/28/2014, 12:25 pm 22 ultralow noise and spurious fractional-n synthesizer michel a. n/a LTC6947iufd demo circuit 1846a kim t. size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 01/28/2014, 12:25 pm 22 ultralow noise and spurious fractional-n synthesizer michel a. n/a LTC6947iufd demo circuit 1846a kim t. size date: ic no. rev. sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 2 01/28/2014, 12:25 pm 22 ultralow noise and spurious fractional-n synthesizer michel a. n/a LTC6947iufd demo circuit 1846a kim t. r7 200k r7 200k wp wp gnd vcc u10 nc7wz17p6x gnd vcc u10 nc7wz17p6x 1 6 4 3 5 2 r8 200k r8 200k sdo sdo sclk sclk v+dig v+dig r12 100 r12 100 r19 200k r19 200k r22 100 r22 100 c44 0.1uf c44 0.1uf gnd dir vcc(a) vcc(b) u11 74lvc1t45gw gnd dir vcc(a) vcc(b) u11 74lvc1t45gw 1 6 4 3 5 2 r18 200k r18 200k r26 4.99k r26 4.99k gnd vcc u5 nc7wz17p6x gnd vcc u5 nc7wz17p6x 1 6 4 3 5 2 r21 100 r21 100 j13 hd2x7-079-molex j13 hd2x7-079-molex mosi/sda 7 eesda 9 v+ 1 5v 2 cs 6 sck/scl 4 eevcc 10 miso 5 eescl 11 eegnd 12 aux 14 gnd 3 gnd 13 gnd 8 c36 0.1uf c36 0.1uf cs cs eegnd eegnd r9 0 r9 0 sdi sdi eeprom array u8 24lc025-i /st eeprom array u8 24lc025-i /st sda 5 vcc 8 a0 1 a1 2 a2 3 gnd 4 wp 7 scl 6 r11 4.99k r11 4.99k c43 0.1uf c43 0.1uf c39 0.1uf c39 0.1uf c41 0.1uf c41 0.1uf r20 4.99k r20 4.99k dc1846af demo manual dc1846a
9 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa - tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. layout top layer dc1846af demo manual dc1846a
10 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com ? linear technology corporation 2014 lt 0514 ? printed in usa demonstration board important notice linear technology corporation ( lt c ) provides the enclosed product(s) under the following as is conditions: this demonstration board (demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by lt c for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties , expressed, implied, or statutory , including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity , neither party shall be liable to the other for any indirect , special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further , the user releases lt c from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory compliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoever . lt c assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. lt c currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. please read the demo board manual prior to handling the product. persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged. this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a lt c applica- tion engineer . mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc1846af demo manual dc1846a
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