TAN-321 2002-02-14 1 audio ic application circuit TAN-321 application circuit example of 3-band (fm, mw and lw) 5-v tuner ta2149bn + tc9257f 1. outline the above is an application circuit example of a 3-band (fm, mw and lw) 5-v tuner. a separate 9-v power supply is required for v tune operation. the circuit incorporates the single-chip ta2149bn, and flat-type tc9257f for pll block. 2. ratings rating characteristic fm mw lw supply voltage 5 v signal frequency range 87.5~108 mhz 522~1620 khz 153~281 khz intermediate frequency 10.7 mhz 450 khz sensitivity 17.5 db v emf (s/n 30 db) 32 db v/m (v o 10 mv rms ) 42 db v/m (v o 10 mv rms ) f/e mpx l r pll fm am if det lw v t mw v co ta2149bn tc9257f
TAN-321 2002-02-14 2 3. mw-lw block 1) mw-lw circuit the coil used in the oscillation circuit is designed for mw. for lw the oscillation frequency is lowered by attaching a capacitor in parallel. a transistor is used to allow switching between mw and lw. in the same way, use of a transistor allows the antenna coil to be switched between mw and lw too. 2) mw-lw adjustment mw: the coil should be adjusted so that v t be 8 v at 1620 khz (approximately 1.9 v at 522 khz). lw: the 30 pf trimmer should be adjusted so that v t be 6 v at 281 khz. 1) adjust tracking for mw at 600 khz and 1400 khz. 2) adjust tracking for lw using a sweep generator so that sensitivity becomes highest around f cover area. 3) adjust tracking for mw again so as to offset the effects of lw antenna coil. 3) tc9257f software specifications 4.5 mhz if in2 (16 pin) 1) ot-4 (9 pin) : fm ?open? , mw. lw ?l? 2) i/o-5 (10 pin) : fm ?l? , mw. lw ?h? 3) i/o-6 (11 pin) : if request ?h? , normal tuning ?l? 4) i/o-7 (18 pin) : mw ?h? , lw ?l? 5) i/o-8 (17 pin) : lw ?h? , mw ?l? fm : 50 khz mw : 9 khz lw : 1 khz
TAN-321 2002-02-14 3 ta2149bn tc9257f 3 band (fm, mw, lw) application circuit 13 14 15 16 17 18 19 20 21 22 12 11 10 9 8 7 6 5 4 3 23 24 2 1 lpf2 l-out lpf1 r-out detin quod deto agc ifreq gnd stled fmif osco amif amosc vcc fmosc mixout amrf amlcut rfvcc frfin fmrf rfgnd bpf 2.2 k 50 pf 36 pf hc-49/us 4.5 mhz 2.2 k 2.2 k 0.01 f 22 f 1 k 3.3 k 47 f 150 h 1s1588 gnd l-ch r-ch 5 v gnd ant. 100 f 150 h 4.7 f 0.015 f 0.015 f 4.7 f 4.7 f 330 cda10.7mg 100a 0.047 f sfe10.7ma5 sfu450b 5plg-5147x 0.47 f 1000 p 1sv101 51 k 51 k 0.022 f 10 p 1500 p 1500 p 10 p rfgnd 1 k 100 k 2sc2458(1923) 1sv149 82 p 30 p mse-0118-5 10 p 0.01 f 4700 p 1sv149 270 p 30 p 330 30p 560 330 p 10 f 0.1 f 0.1 f 1 f 3.3 k 150 k 0.01 f fmvco amvco 0.01 f 0.01 f 1 k 0.01 f 1 k 300 k 1000 pf 2sc2458(1815) 2.4 k 1 k 3.3 f 0.01 f if 22 f 0.033 f 22 k 3.3 k 2sc2668(1923) 2sc2668(1923) 2sc2668(1923) 9 v 100 k 1 k 2sc2668(1923) vt rfvcc 1000 p 1sv101 ta2149bn 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 xt do2 xtn do1 period i/o-7 clock i/o-8 data if in2 ot-1 gnd ot-2 fmin ot-3 amin ot-4 vdd i/o-5 i/o-6 tc9257f 305nk 306nk
TAN-321 2002-02-14 4 ta2149bn-3 band (fm, mw and lw) coil specification turns no. stage f (hz) l ( h) c (pf) q 1-2 2-3 1-3 1-4 4-6 wire (mm) note l1 fm rf 100m 79 2? 0.16 uew 666snf-305nk@t l2 mw ant 796k 285 200 69 13 (3-4) 7/0.07 ustc mse-0118-5@m l3 lw ant 252k 1660 100 160 (2-6) 16 (7-3) 4/0.07 ustc mse-0118-5@m l4 fm osc 100m 76 2 0.16 uew 666snf-306nk@t l5 mw osc 796k 120 120 13 56 0.07 uew a7brs-12552y@t t1 mw ift 455k 470 60 109 7 0.05 uew 5plg-5147x@t m: mitsumi (segamat) sdn. bhd t: toko, inc (bottom view) description of operation in the printed circuit board pattern example, the oscillation at the lower frequency and the lower impedance may become parasitic oscillation frequency because the distance from this ic to the fm and rf tank circuits is long. this tendency is particularly evident in 1/16 vco mode. to prevent the parasitic oscillation, insert a resistor of around 7.5 between pin 21 and l4. this measure reduces parasitic oscillating impedance, narrowing the parasitic oscillation range. the fm and rf tank circuits should be located as near the ic as possible. 3 1 2 4 l1, l4 3 1 4 6 2 l5 3 1 4 6 2 t1 l3 (lw) 6 2 s 3 f 3 3 7 s 4 f 4 4 3 f 2 s 2 2 1 f 1 s 1 l2 (mw)
TAN-321 2002-02-14 5 example of printed circuit board pattern
TAN-321 2002-02-14 6 output level (db) thd (%) input signal level vin (db v, e mf) fm output ? vin output level (db) signal frequency (mhz) fm sens, im rej ? f s sensitivity (dbv emf) image ratio (db) detuning frequency f (khz) fm output ? f thd (%) equivalent electric field intensity efi (db v/m) mw output ? vin signal frequency (khz) mw maximum sensitivity s/n maximum sens (dbv emf) s/n (db) 120 70 20 60 50 40 30 20 10 0 10 0 20 40 100 98 mhz 22.5 khz f m 400 hz bw 400 hz~30 khz thd 22.5 khz 0 db 80 mv 80 60 80 thd 7.5 khz amr 30% mdo f m 400 hz 80 20 70 60 50 40 30 20 10 0 10 0 20 100 120 140 40 60 80 thd mod 80% thd mod 30% 0 db 84 mv 999 khz f m 400hz mod 30% bw 400 hz~30 khz 10 20 30 40 50 600 800 1000 1200 1400 1600 v cc 5 v f m 400 hz mod 30% s/n (efi 60 db/m) maximum sens (v o 10 mv rms ) 400 1800 2000 400 300 200 300 400 200 100 0 100 20 vo (db) thd 2% 4% 0 db mod 7.5 khz mod 22.5 khz v cc 5 v f r 98 mhz vin 60 db v emf f m 400 hz mod 22.5 khz 0 db 81 mv rms 10 1% 3% 30 10 20 30 40 108 106 102 98 94 91 87.5 lim. sens (0 db at 60 db v emf) image (v o 50mv rms ) sens (s/n 30 db) v cc 5 v f m 400 hz mod 22.5 hz
TAN-321 2002-02-14 7 thd (%) equivalent electric field intensity efi (db v/m) lw output ? vin output level (db) signal frequency (khz) lw maximum sensitivity s/n maximum sens (db m) s/n (db) 80 20 70 60 50 40 30 20 10 0 10 0 20 100 120 140 40 60 80 thd mod 80% 0 db 75 mv 220khz f m 400hz mod 30% bu 400hz~30khz thd mod 30% 300 10 20 30 40 50 160 180 200 220 240 260 v cc 5 v f m 400 hz mod 30% s/n (efi 60 db/m) maximum sens (v o 10 mv rms ) 280 153
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