TAN-320 2001-12-19 1 audio ic application circuit tan ? 320 5 v fm, sw2, sw1, mw single-chip tuner ic ta2111n 1 . outline this application circuit example is for a three-band (fm, sw2, sw1, mw) 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 sw2 sw1 mw supply voltage 5 v current dissipation (quiescent) 14 ma 8 ma signal frequency range 87.5~108 mhz 6.7~22.5 mhz 2.2~7.3 mhz 520~1650 khz intermediate frequency 10.7 mhz 455 khz sensitivity 14.5dbv emf (s/n = 30db) 4dbv emf (v o = 10 mvrms) 4dbv emf (v o = 10 mvrms) 32dbv/m (v o = 10 mvrms)
TAN-320 2001-12-19 2 3. cautions on use (1) to reduce spurious signals in the fm frequency range in the sw1 or sw2 band, an inductor (1 h) is inserted next to the amrf input pin (pin 24). (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) to reduce the stray capacitance of the circuit board (pattern), the primary side of the sw1/sw2 antenna coil is input from the tap. (4) the characteristics of the sw1 and sw2 bands are measured using the pseudo antenna circuit shown in figure 2 below : figure 2
TAN-320 2001-12-19 3 ta2 111 n-3band (fm, sw 1 , sw2, mw) application circuit
TAN-320 2001-12-19 4 ta2 111 n-3band (fm, sw 1 , sw2, mw) coil specification turns no. stage f (hz) l (h) c (pf) q (min) 1-2 2-3 1-3 1-4 4-6 wire (mm) note l1 fm rf 100m 0.06 D 100 D D 2 1/4 D D 0.5 uew 0258-000-021@s l2 sw1 ant 2.52m 17 D 75 16 11 27 D 11 0.08 muew 4148-t024@s l3 sw2 ant 7.96m 1.7 D 70 6 3 9 D 5 0.12 muew 4148-t026@s l4 mw ant 796k 279 D 200 D 68 (1-2) D 13 (3-4) D 7/0.07 ustc mse-0119@m l5 fm osc 100m 0.045 D 100 D D 1 3/4 D D 0.5 uew 0258-000-020@s l6 sw1 osc 2.52m 12.4 D 125 7 16 D D D 0.08 uew 4148-3099-176@s l7 sw2 osc 7.96m 1.4 D 85 4 4 D D D 0.12 uew 4148-3167-079@s l8 mw osc 796k 120 D 120 13 56 D D D 0.07 uew a7brs-12552y@t t1 mw ift 455k 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-320 2001-12-19 5 example of printed circuit board pattern
TAN-320 2001-12-19 6
TAN-320 2001-12-19 7
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