TAN-324 2002-02-14 1 audio ic application circuit TAN-324 application circuit example of 4-band (fm, sw1, sw2, mw) 3 v tuner ta2132bp 1. outline the above is an application circuit example of a 4-band (fm, sw1, sw2, mw) 3 v tuner. the ta2132bp is a single-chip fm/am mono tuner ic. the four-band antenna and local oscillator are switched by a lever switch (6-circuit, 4-contact). tracking is adjusted using a multi-band variable capacitor. 2. ratings rating characteristic fm sw1 sw2 mw supply voltage 3 v signal frequency range 87~109 mhz 2.1~7.15 mhz 6.8~22.4 mhz 520~1640 khz intermediate frequency 10.7 mhz 455 khz sensitivity 14db v emf (s/n 30db) 6.5db v emf (v o 10 mvrms) 9db v emf (v o 10 mvrms) 34db v/m (v o 10 mvrms) sw ta2132bp f/e fm am if det v out fm sw1 sw2 mw
TAN-324 2002-02-14 2 3. precautions for use fm: (1) be sure to insert a bypass capacitor between v cc and the ic?s gnd pins (pins 5 and 8). if a bypass capacitor is not inserted, oscillation may occur at low input. also be sure to minimize common impedance from the printed circuit board pattern. (2) insert an inductor (10 h) as decoupling in the power line connecting the v cc (pin 5) to the rf tank circuit, osc circuit, and pin 14. this improves the stability of the s curve. (3) insert a bypass capacitor (0.033 f or higher) between rf v cc and the rf gnd pins (pins 14 and 2). if 0.022 f or lower is used, beat or oscillation may occur. 0.033 f ? pin 1 (4) for adjustment-free operation, a discriminator cda 10.7mg92c (murata) is used for the detector. mw: (1) the decoupling capacitor (0.033 f) connected to the v cc line between pin 5 and the rf tank and osc circuits reduces interference such as high-frequency noise. (2) as the am ceramic filter, sfu455b (murata) is used. figure 1 figure 2 pin 5 0.033 f 1
TAN-324 2002-02-14 3 sw2: the antenna circuit (primary tuning transformer side) has a full tap to improve sensitivity. stray capacitance, which depends on the printed circuit board pattern, cannot be ignored. the trimmer capacitance (c1) may exceed the range when adjusting the sensitivity. in such a case, reduce the stray capacitance using a transformer with a tap. sw1: the antenna circuit (primary tuning transistor side) uses a transformer with a tap that reduces stray capacitance caused as a result of the pattern and adjusts the sensitivity. stray capacitance, which depends on the printed circuit board pattern, cannot be ignored. the trimmer capacitance (c1) may exceed the range when adjusting the sensitivity. in such a case, reduce the stray capacitance by lowering the tap position. figure 3 sw antenna coil ant c1 figure 4 sw antenna coil ant c1
TAN-324 2002-02-14 4 other precautions am gain increase when sensitivity is insufficient for mw, increase the number of turns of antenna coil on the secondary transformer. padding capacitor the am antenna and the local oscillator circuits are switched using the multi-band variable capacitor. thus, capacitance must be determined according each band frequency. use a padding capacitor with small capacitance error and high q. sw1, sw2 test circuit (ant) the sw characteristics are measured using the pseudo antenna circuit shown in figure 5 below. am local oscillator the distance from the oscillator for multi bands to pin 12 is long due to restrictions on component allocation. as a result, some faults such as parasitic oscillation, oscillation halt, and undesirable local oscillation may be caused. especially when the pattern line is long, the ac impedance component cannot be ignored. oscillation may occur in the parasitic circuit shown in figure 6. the oscillation can be avoided by inserting a resistor (75 ) in series. test board pseudo antenna circuit 10 pf 80 figure 5 figure 6 v cc parasitic circuit 75 12
TAN-324 2002-02-14 5 ta2132bp-3band (fm, sw1, sw2, mw) application circuit fmrfin amrfin rf gnd fmrfout mixout am/fm sw agc fmosc vcc amosc fmif afc amif deto gnd quod 13 14 15 16 12 11 10 9 8 7 6 5 4 3 2 1 ta2132bp fm sw2 sw1 mw fm sw2 sw1 mw fm sw2 sw1 mw fm sw2 sw1 mw fm sw2 sw1 mw fm sw2 sw1 mw bpf 10 pf l3 l2 10 pf l4 10 pf 390 pf 1500 pf 5600 pf 10 pf l7 l6 l8 27 pf 18 pf 15 pf 10 pf 18 pf l1 22 pf l5 4 pf 100 k 1 k 22 k 0.033 f cda10.7mg92c 0.47 f 100 k 330 pf 0.033 f 30 pf gfwb7 330 sfe10.7ma5 sfu455b 0.033 f 4.7 f t1 5plg-5147x 33 f fm, sw 1/2 ant am varicons: pvc-22kt-l fm varicons: pvc-22kt-l 75 det out v cc mw ant coil 4.7 f 1000 pf 10 h
TAN-324 2002-02-14 6 coil specification turns no. stage f (hz) l ( h) c (pf) q 1-2 2-3 1-3 4-6 wire (mm) note l1 fm rf 100 m 0.06 100 4 1 2 0.5 uew (s) 0258-000-021 l2 sw1 ant 2.52 m 14.2 80 18 7 25 11 0.08 uew (s) 4148-3099-298a l3 sw2 ant 7.96 m 1.5 95 3 5 8 5 0.12 muew (s) 4148-3167-064 l4 mw ant 796 m 279 200 68 13 (3-4) 7/0.07 uatc (m) mse-0119 l5 fw osc 100 m 0.045 100 4 3 1 0.5 uew (s) 0258-000-020 l6 sw1 osc 2.52 m 12.4 125 7 16 23 0.08 uew (s) 4148-3099-176 l7 sw2 osc 7.96 m 1.4 85 4 4 8 0.12 uew (s) 4148-3167-079 l8 mw osc 796 k 120 120 13 56 0.07 uew (t) a7brs-12552y t1 mw ift 455 k 470 60 109 7 0.05 uew (t) 5plg-5147x s: sumida electric co., ltd m: mitsumi (segamat) sdn. bhd t: toko, inc pin connections (bottom view) fmcf 2 3 1 4 6 pin 4 amcf v cc t1 l1, l5 l2, l3 l6, l7, l8 3 2 1 4 6 1 2 3 4 6 v.c 1 2 3 4 v cc v cc pin 16 l4
TAN-324 2002-02-14 7 example of printed circuit board pattern 1 rp-2045 4band ta2132bp fm sw1 sw2 mw fm sw mw lw v cc gnd v out osc lw mw mw osc sw2 sw2 ant ant sw1 sw osc a nt gnd sw1 sw mw lw fm rf fm osc 4 1 2 3
TAN-324 2002-02-14 8 output level (db) thd (%) input signal level v in (db v, e mf) fm output ? v in output level (db) signal frequency (mhz) fm sens, im rej ? f s sensitivity (db v emf) image ratio (db) thd (%) input signal level v in (db v, e mf) sw1 output ? v in signal frequency (mhz) sw1 sensitivity ? image ratio sensitivity (db v emf) image ratio (db) 10 20 30 40 108 106 102 98 94 90 88 lim. sens ( 3db) image (v o 50mvrms) sens (s/n 30db) v cc 3 v mod 22.5 khz f m 400 hz bw 400 hz~30 khz output level (db) thd (%) equivalent electric field intensity efi (db v/m) mw output ? efi signal frequency (khz) mw maximum sensitivity s/n maximum sens (db v/m) s/n (db) 0 10 20 30 40 2 3 4 5 6 7 v cc 3 v f m 400 hz mod 30% bw 400 hz~30 khz image (v o 20 mvrms) maximum sens (v o 10 mvrms) 1 8 9 sens (s/n 20db) 20 80 60 40 0 20 0 20 40 120 80 60 100 10 50 30 20 70 10 v cc 3 v, 0db 74 mvrms bw 400 hz~30 khz 98.089 mhz 22.5 khz f m 400 hz signal amr mod 30% f m 400 hz noise 75 khz thd 22.5 khz 140 4 3 2 1 80 20 70 60 50 40 30 20 10 0 20 0 20 100 120 140 40 60 80 10 v cc 3 v, 998.3 khz f m 400 hz mod 30% bw 400 hz~30 khz 0 db 69 mvrms signal mod 80% thd mod 30% noise 3 4 2 1 80 20 70 60 50 40 30 20 1 0 20 0 20 100 120 140 40 60 80 thd 10 noise mod 30% 4.746 mhz f m 400 hz mod 30% v cc 3 v, 0db 72 mvrms bw 400 hz~30 khz signal mod 80% 4 3 2 1 10 20 30 40 60 600 800 1000 1200 1400 1600 400 1800 2000 70 50 s/n (60db/m) sens (s/n 30db) maximum sens (v o 10 mvrms) v cc 3 v f m 400 hz mod 30% bw 400 hz~30 khz
TAN-324 2002-02-14 9 thd (%) input signal level v in (db v, e mf) sw2 output ? v in output level (db) signal frequency (mhz) sw2 sensitivity ? image ratio sensitivity (db v emf) image ratio (db) 0 10 20 30 40 8 10 12 14 16 18 v cc 3 v f m 400 hz mod 30% bw 400 hz~30 khz image (v o 20 mvrms) maximum sens (v o 10 mvrms) 7 20 22 sens (s/n 20db) 80 20 70 60 50 40 30 20 10 0 20 0 20 100 120 140 40 60 80 10 signal 13.992 mhz f m 400 hz mod 30% thd noise mod 80% mod 30% v cc 3 v, 0db 71 mvrms bw 400 hz~30 khz 1 4 3 2
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