Texas InstrumentsメーカーTRF1500の使用説明書/サービス説明書
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Evaluati on Board D ocum entatio n TRF150 0 Integrat ed Dual-Band RF Rece iver User ’ s Guide APPLICATION BRIEF: SW RA0 04A Wirel ess Com munic atio ns Busi ne ss Unit Digita l Signal Processin g So.
IMP O RT A NT NO T I CE Texas Ins truments (TI) re serves the right to make changes to its p roducts or to d i sc ontinue any se m iconduc tor produc t or se rvice without no tice, and a dvise s its c.
T R AD EM AR KS TI i s a tra d em a r k of T exa s I n st r um ent s I n co rp o r at ed . Other brands and nam es ar e t he prope rty of t heir respe ctive owne rs.
CONT ACT I NFORM AT IO N PI C TELE PHONE (972) 64 4-5 580 PI C FAX (972) 48 0-7 800 HP SUP POR T LI NE (972) 48 0- 7 87 2 PI C emai l sc- in f omas ter @ti .
Contents A b s tract ....................................................................................................................... .. 9 Product Support .........................................................................................
Contents High- Band Cascad ed: P ower C onv ersio n Gain R eductio n ...................................... 41 High- Band Cascad ed: I mag e Rej ection................................................................... 42 High- Band Cascad ed: N oise F igure .
Fig ure s Figur e 1. TRF 1500 D ual- Band R ecei ver Block Diagr am ................................................ 14 Figur e 2. Casca ded Bl ock Dia gram of the Low -Band Rec eiver Sec tion ......................... 18 Figur e 3. Volt age Di vid er at L ow-Ba nd LN A I nput .
TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 9 TRF1500 Integrated Dua l-Band RF Receiv e r User’s Guide Abstract The dual -band han dse t mark et is exp andi ng v ery rapi dly due t o the in crease in customers requ iring roaming capability.
SWRA004A 10 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Pr oduc t Suppor t The TI A d van ta ge E xt en ds Be yon d RF to E ver y O th er Major Wi rel ess Sy stem B lock RF Int erfac.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 11 Rela te d D ocum enta ti on The follow in g list sp eci fies pr oduc t n ames , par t num bers, and li teratur e num ber s of cor resp ondi ng TI doc ume ntatio n.
SWRA004A 12 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Int roduc t i on The TR F 1500 is a dual -ban d/d ual-m ode Per sonal Commu n ications System (PCS) re c e ive r fo r cellular telep ho nes oper atin g du al mo de ( anal og a nd digi tal) i n th e 800 M Hz ba nd an d singl e m ode ( digi tal) i n the 1900 M Hz ban d.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 13 Desi gn Considera ti ons The s ucc ess ful int egr atio n of a TR F150 0 rec eiver devi ce i nto a desig n is de pend ent upon the p er f or manc e of t he ext ern al compo nents and th e qu ali ty of t he boar d de sign and layo ut.
SWRA004A 14 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide TRF 1500 Du al-Ban d Rec ei ver A bl ock diagr am o f t he TRF 1500 d ual-b and r ecei ver f ron t end down conv ert er is show n in F igur e 1. Pin nam es an d des cri ptions are provi ded in T able 1.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 15 Table 1. Pi n Descri pt i ons Pin Num ber Name Descrip tion 1 Bi as A dj ust Bi as adj ust 2 TX IF + Tr ansmi t IF, noni n v e.
SWRA004A 16 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 38 STRO N G SIGNAL Str ong si gnal indicati on 39 GND ground 40 VCC VCC 41 GND ground 42 LNA IN HIG H BA ND Hi gh band LNA inp.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 17 TRF 1500 Cont rol Sta te The TR F 1500 o pera tes i n 18 di ffere nt st ates: T he co ntrol c ode and ac tive cir c uits are give n in T abl e 2.
SWRA004A 18 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low B and Cas caded R eceiver Section: LNA , Externa l SA W Fil ter , Mixer , a nd LO Buff er Ampli f ier The TR F 1500 l ow-b.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 19 Low -B an d LN A I n a typi cal down- co nversi on r ecei ver, the LNA is us uall y pl aced dir ectly aft er the ante nna a nd a ban d-s elec t filter .
SWRA004A 20 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low -B an d LN A In pu t Fi gure 4 det ails t he low- ban d LNA i npu t con figur ati on.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 21 Fi gure 5. Low-Ba nd LNA Outp ut Confi guration Surfa ce Aco us tic Wave (S AW) Fil ter The SA W f i lter is use d prim aril y as an im age- rej ect f il ter (I RF ).
SWRA004A 22 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low -B and M ix er The pur pose o f t he m ixer i n a dow n-co nversi on r ecei ver i s to trans late incom i ng si gnals fr om o ne fr eque ncy to an other . T he low -ba nd mix er i n the TR F150 0 is a t hree port high- si de i nject ed cir cuit.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 23 Lo w -Band Mixe r LO In put Figur e 8 det ails t he l ow-b and m ixer LO i nput c onfig ur ation. T he inpu t pow er r ange l evel for t h e LO b uffer ampl i f ier is f lexi bl e enou gh (- 3 d Bm to -7 dBm ) t o dr ive t he m ixer w itho ut e nter ing compr essi on.
SWRA004A 24 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Fi gure 9. Low-Ba nd IF Output Confi guration Low -B an d LO B uf fer Am pl i fie r O u tp ut Fi gure 10 detai ls the l ow- band LO b uffer ampli f i er co nfig urati on .
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 25 Fi gure 10. Low-B and Buffe r Ampli fier Output C onfigurati on.
SWRA004A 26 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low-B and Casc aded T est Gu i de This sec tion i nvol ves m eas urin g t he casc aded perfor ma nce o f the Low Band LNA , Low Ban d MI XER an d Low Ba nd I F Amp. An ext e r na l SAW f ilt e r is ut ilize d to com p le te the RF rec e iver section.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 27 2) Set the LO sour ce p ower ( LO P in ) an d the desi red frequ ency (see T able 3) . C onnec t the LO so urce to th e EVM LO inp ut port, J1 2. 3) Set the s pec trum a nalyz er to m easur e at t he I F fr eque ncy (s ee Tabl e 3) .
SWRA004A 28 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 4) Conn ect the EVM IF output port, J 11, t o the s pec trum anal yzer . 5) M easure t he o utput pow er at the I F f r eq uency ( IF P out ) with the spectr um anal yz er. 6) Ena ble the str ong sig nal .
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 29 b) Nex t, pr ess th e N oise Fi gure a nd Gai n Butt on. The corr ec te d LED j ust ab ov e the bu tton s ho ul d be lit. c) Cali bration i s com plete . Ent er the desire d IF f reque ncy t o meas ur e.
SWRA004A 30 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low -Ban d C asca de d: RF I n put Re tur n Lo ss Co nt rol st ate : 0110 00 The i nput r eturn loss of th e low ban d recei ver is meas ure d at t he EVM low ba nd R F inpu t por t, J1 0.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 31 LOW BAND: L O Buffer Ou tput Power Co nt rol st ate : 0110 00 SE E A P PENDIX A : TEST BENCH SE TUPS Test s etup Fi gure 2 0 This sec tion i nvol ves m eas urin g t he Low Ban d LO B u ffer O utput .
SWRA004A 32 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low -Ban d C asca de d: Th ird Order Inp ut I nt erce pt P oint (IIP 3) Co nt rol st ate : 0110 00 SE E A P PENDIX A : TEST BE.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 33 L ow - Ba nd Ca sca de d: 1d B RF I np ut Comp re ss i on Po int Co nt rol st ate : 0110 00 SE E A P PENDIX A : TEST BENCH SE TUPS Test s etup Fi gure 2 0 The 1 dB input c o mpression poin t is t h e RF i n put power at which th e gain c o mpresses 1 dB.
SWRA004A 34 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide -24 0.4 24.4 -23 1.2 24.2 -22 2.2 24.2 -21 3.0 24. 0 ← 1dB Co m pression Poi nt -20 3.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 35 High-B and Casc aded R eceive r Sect ion: LNA , Mixe r , LO Buff er Am pli fier Casc ade d Hi gh-Ba nd R ecei ver S ect ion: L.
SWRA004A 36 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Hi gh -Ba nd RF In put Fi gure 12 detai ls the high- ba nd RF input co nfig uratio n. The casca de d nois e f ig ure and i np ut retur n l oss p er forma nce o f the high- band r eceiv er s ecti on i s det erm ined pr imar ily by t he input matchi ng ne twork.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 37 Figu re 1 3 deta ils the TRF15 00 conf i gure d to u t ilize the low-b and LO in put and d oubl er as the hi gh-b and LO. Th e hig h-ban d LO signal is injec ted in to th e low- band LO i nput.
SWRA004A 38 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Hi gh -Ba nd IF Ou tpu t Figur e 15 detai ls the high- band m ix er I F ou tput c onfi gur ation. T h e high- band mi xer has a di ffere ntial IF outp ut wit h a 1k Ω di ffer en tial out put im ped ance.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 39 Hig h-B an d LO B uf fer Am pli fier Ou tpu t Fi gure 16 detai ls the high- ba nd LO bu ffer am pli f ier con figur ati on. The hig h-band LO b uffer c an be used in eith er sing le- end ed or di ff erenti al mo de for a phase l ock l oop (P LL) c o nfigur ation.
SWRA004A 40 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide High-B and Casc aded T est Gu i de This sec tion i nvol ves m eas urin g t he casc aded perfor ma nce o f the Hi gh Ban d LNA, Hi gh B and M ix er and H ig h Ban d IF Am p usi ng the F req uency D oubler .
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 41 2) Set the LO sour ce p ower ( LO P in ) an d the desi red frequ ency (see T able 4) . C onnec t the LO so urce to th e EVM LO inp ut port, J1 2. 3) Set the s pec trum a nalyz er to m easur e at t he I F fr eque ncy (s ee Tabl e 4) .
SWRA004A 42 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Hig h-Ban d Casc a ded: Im age R eje ction Co nt rol st ate : 1110 01 SE E A P PENDIX A : TEST BENCH SE TUPS Test s etup Fi gu.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 43 Hig h-B and C asc ade d: Noi se Figur e Co nt rol st ate : 1110 01 SE E A P PENDIX A : TEST BENCH SE TUPS Test s etup Fi gure 2 2 The c asc aded N oise Figur e (N F) i s me asure d at the E VM Low Band I F o utput por t, J21 .
SWRA004A 44 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide a) Spe cial F uncti on 34.1 tur ns on the l oss com pensati on factor. b) Spe cial F uncti on 34.2 is us ed to e nter the los s be f or e t he DUT. c) Spe cial F uncti on 34.3 is us ed to enter th e room temp erat ure i n K elvin ( 30 0 ° K).
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 45 1) Set the netw ork a nalyz er t o me asur e the low ba nd RF freq ue ncy (s ee T abl e 4). 2) Se t the p owe r rang e to -3 5 dB m t hro ug h -2 0 dBm, and t hen set t he in put power to -3 0 dBm .
SWRA004A 46 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Hig h-Ban d C asca ded: Pow er Le akage LO I n to RF In Co nt rol st ate : 1110 01 SE E A P PENDIX A : TEST BENCH SE TUPS Test s etup Fi gure 2 3 The LO l eakag e at t he R F p ort is m easur ed a t the low ba nd RF inpu t por t J20 .
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 47 6) Conn ect the EVM IF output port, J 21 to th e s pectr um a nalyz er. 7) M easure t he Fu ndam ental ou tput pow er at the I F f re quenc y (F Fund ).
SWRA004A 48 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide RF P in P out Gain -35 -10 25 -34 -9 25 -33 -8 25 -32 -7 25 -31 -6 25 -30 -5 25 -29 -4 25 -28 -3 25 -27 -2 25 -26 -1. 2 24.8 -25 -0. 4 24.6 -24 0.4 24.4 -23 1.2 24.2 -22 2.2 24.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 49 8) C alculat e 2 X 2 spur per f orm anc e as 2 X 2 sp ur pe r f orm ance = 1 P out - 2 P out.
SWRA004A 50 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low-Ba nd a nd High- Ba nd T r a nsmi t Low- and H ig h-B and Tra nsmit M ixer Figur e 17 detai ls the block dia gram of the tra nsmi t mixer .
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 51 Fi gure 18. Low- and H igh-B and Tra nsmit Mixer R F Input Confi gurati on Low - a nd H igh-B a nd Tr a nsmi t Mix er IF Ou t put Figur e 19 detai ls the tr ansm it mix er IF outpu t con figur atio n.
SWRA004A 52 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low-B and T r ansmit Mixe r T est Gu ide Thi s sec tion inv olves m easur ing t he Tr ansmit M ixer per forma nce. All tests apply f or an IF out pu t term inat ed i nto a 1 k Ω di fferenti al load .
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 53 3) Set the s pec trum a nalyz er to m easur e at t he I F fr eque ncy (s ee Tabl e 5) . 4) Conn ect the EVM IF output port, J 31, t o the s pec trum anal yzer . 5) M easure t he I F out put p ower ( IF P out ) at the I F fre qu enc y wi th the s pectr um analy zer.
SWRA004A 54 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide b) Nex t, pr ess th e N oise Fi gure a nd Gai n Butt on. The corr ec te d LED j ust ab ov e the bu tton s ho ul d be lit. c) Cali bration i s com plete . Ent er the desire d IF f reque ncy t o meas ur e.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 55 1) Set the netw ork a nalyz er t o me asur e the low ba nd RF freq ue ncy (s ee T abl e 5). 2) Se t the p owe r rang e to -3 5 dB m t hro ug h -2 0 dBm, and t hen set t he in put power to -3 0 dBm .
SWRA004A 56 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 1) Set the T X so urce fre quency a nd i nput power (se e Ta ble 5) . Conn ect th e TX so urce to th e EVM TX in put p ort, J 30. 2 ) Se t the spe ctru m an al yzer to me a su re at the T X fr equen cy (s ee Tabl e 5) .
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 57 -31 -12 19 -30 -11. 2 18. 8 -29 -10. 2 18. 8 -28 -9. 2 18.8 -27 -8. 4. 18.6 -26 -7.
SWRA004A 58 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low -Ba nd Tra ns mit Mi xe r: Thi rd Ord er Inpu t Inte rcept Point (IIP3 ) Co nt rol st ate : 0101 00 SE E A P PENDIX A : TE.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 59 High-B and T r ansmit Mixer T est Guide Thi s sec tion inv olves m easur in g the Hi gh Ba nd Tr ansmi t M ixer per form ance. All tes ts ap ply for a n IF ou tput term inate d in to a 1 k Ω di fferen tial lo ad.
SWRA004A 60 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Low-Ba nd LNA S tand- Al one T es t Gui de This sec tion i nvol ves m eas urin g the Low Ban d LNA by i tsel f.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 61 The LNA i nput r e turn l oss i s me asur ed at the i npu t Por t J10. Usi ng the c alibr atio n per form ed ab ov e, set t he n etwork an alyz er to meas ur e S11 .
SWRA004A 62 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 6) To d eter mine the 1 dB c ompr essi on poi nt, th e RF P in is in cre ase d in steps of 1 dB m un t il th e ga i n co mpr e sse s by 1 dB. R epea t st ep 4 and 5 until the gai n com pres ses by 1dB.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 63 c) Af te r ent er i ng th e EN R f or th e de sire d f r eq ue nc y, pre s s th e Fr equency butt on on t he fr ont panel t o exit. 5) To c ali brat e the N F Meter : a) C onnect the N oise So urc e dir ectly to the NF meter ; pr es s the cal ibr ation but ton tw ice.
SWRA004A 64 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide The third ord er in put i nter cept poin t is t he lev e l of th e RF inp ut power at whic h th e out put power l evels of th e un desir ed inter mo dulati on pr od ucts and the d esir ed pr oduc ts ar e eq ual.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 65 Low-Ba nd Re c ei v er Mixe r Sta nd- Al one T es t Gui de This sec tion i nvol ves m eas urin g t he Low Ban d Rec eiver M ixer. All unus ed po rt s will be t e rminated into 5 0 Ω .
SWRA004A 66 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 5) M easure t he I F out put p ower ( IF P out ) at the I F fre qu enc y wi th the s pectr um analy zer. 6) C alculat e t he C asc aded Gai n as: Gain = (IF P out - RF P in ) + Transforme r Lo ss.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 67 Low-B an d Rece iver Mixer : P ower L eaka ge LO In t o R F In Co nt rol st ate : 0110 00 SE E A P PENDIX A : TEST BENCH SE TUPS Test s etup Fi gure 2 3 The LO l eakag e at t he R F p ort is m easur ed a t the low ba nd mix er RF input port, J15.
SWRA004A 68 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide a) On t he fro nt pa nel , press the EN R but to n. b) C heck th e ENR val ue by pr essin g the E nter bu tton or e nter the ENR value for each f r equen cy.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 69 J12, may be n ecess ary to elim inat e the bro ad b and n oise duri ng t esti ng.
SWRA004A 70 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide -23 -13 10 -22 -12. 2 9. 8 -21 -11. 4 9. 6 -20 -10. 4 9. 6 -19 -9.6 9.4 -18 -8.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 71 I ntermod ulati on Suppr essi on = F Fund - Inter modul ation prod uct 10) Cal culat e th e Inp ut T hird - Ord er I nterc ept.
SWRA004A 72 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Appendi x A: T est B e nc h Conf i gu r ation Fi gure 20. Test Bench S etup: P ower Conversi on Gain, Pow er Conversion Gai n .
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 73 Fi gure 22. Test B ench Setup: N oise Fi gure NOISE FIGURE METE R DUT LO SIGNAL SOURCE RF IN IF OUT LO IN DC P OWER SUPPLY DC P OWER METE R NOISE SOURCE Fi gure 23.
SWRA004A 74 TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide Fi gure 24. Test Bench S etup: P ower Leakage RF In to LO I n Me asurements 50 Ω SPECT RU M ANALYZER RF SIGNAL SOURCE DC POWER SUPPLY DC POWER METER RF I N LO IN IF OU T DUT Fi gure 25.
SWRA004A TRF 1500 Integrated Dual- B and RF Receiver Us er ’s G uide 75 Fi gure 26. Test Bench S etup: LN A Thi rd Order Input I nterce pt Poi nt (IIP3) Measurement RF SIGN AL SOURCE RF SIGN AL SOURCE DC P OWER SUPPLY DC P OWER METE R RF IN RF OUT SP ECTRUM ANALYZER DUT Fi gure 27.
デバイスTexas Instruments TRF1500の購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
Texas Instruments TRF1500をまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはTexas Instruments TRF1500の技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。Texas Instruments TRF1500の取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。Texas Instruments TRF1500で得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
Texas Instruments TRF1500を既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はTexas Instruments TRF1500の不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、Texas Instruments TRF1500に関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちTexas Instruments TRF1500デバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
