TAN-319 2001-12-19 1 audio ic application circuit tan ? 3 1 9 5 v fm, sw, mw, lw single-chip tuner ic ta2111n 1 . outline this application circuit example is for a four-band (fm, sw, mw, lw) 5 v tuner circuit. the ic is a single-chip ta2111n which incorporates all circuits from rf to mpx. four bands are supported by switching an antenna and an oscillator circuit using a six-circuit four-contact lever switch. signal frequencies are tuned using polyvaricons. 2. ratings rating characteristics fm sw mw lw supply voltage 5 v current dissipation (quiescent) 14 ma 8 ma signal frequency range 87.5~108 mhz 5.7~15.6 mhz 520~1650 khz 146~287 khz intermediate frequency 10.7 mhz 455 khz sensitivity 13dbv emf (s/n = 30db) 10dbv emf (v o = 10 mvrms) 34dbv/m (v o = 10 mvrms) 43dbv/m (v o = 10 mvrms)
TAN-319 2001-12-19 2 3. cautions on use (1) when signal source impedance is high referring to the ic (pin 24), radiation or feedback, resulting from signal loop for mixer output (pin 4) if trans, make a mixer circuit unstable. to prevent generating beat due to the above, insert a series resistor for am input (pin 24) or lower the second antenna coil impedance. (2) insert a resistor (33 ? ) next to the am osc pin (pin 20). in the lower part of the frequency range, if the load impedance of the oscillator circuit drops lower than that of the parasitic circuit (indicated by the dots in figure 1), oscillation frequency of the parasitic circuit may stop. to avoid signals not being received due to the above, insert a resistor to lower the q of the parasitic circuit. figure 1 (3) the characteristics of the sw bands are measured using the pseudo antenna circuit shown in figure 2 below : figure 2
TAN-319 2001-12-19 3 ta2 111 n-4band (fm, sw, mw, lw) application circuit
TAN-319 2001-12-19 4 ta2 111 n-4band (fm, sw, mw, 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 100 m 0.06 D 100 D D 2 1/4 D D 0.5 uew 0258-000-021@s l9 mw ant 796 k 285 D 200 69 D D 13 (3-4) D 7/0.07 ustc mse-0118-1@m l3 sw ant 7.96 m 2.1 D 105 3 7 D D 8 0.08 muew 4148-3167-063@s l4 lw ant 252 k 2910 D 100 D 218 (2-6) 16 (7-3) D D 4/0.07 ustc mse-0118-1@m l5 fm osc 100 m 0.045 D 100 D D 1 3/4 D D 0.5 uew 0258-000-020@s l6 mw osc 796 k 120 D 120 13 56 D D D 0.07 uew a7brs-12552y@t l7 sw osc 7.96 m 1.85 D 85 6 5 D D D 0.1 uew 2158-4095-508@s l8 lw osc 796 k 219 D 120 29 63 D D D 0.07 uew 4155-2239-074a@s t1 mw ift 455 k D 470 60 D D 109 D 7 0.05 uew 5plg-5147x@t s: sumida electric co., ltd m: mitsumi (segamat) sdn. bhd t: toko, inc (bottom view)
TAN-319 2001-12-19 5 example of printed circuit board pattern (top view)
TAN-319 2001-12-19 6
TAN-319 2001-12-19 7
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