KA22427C am/fm 1 chip radio introduction 16-dlp-300a KA22427C is a monolithic integrated circuit designed for the portable am/fm radio or am/fm clock radios. functions am rf & mix am local osc am agc am/fm if amp am/fm det audio power amp regulator fm afc control feature portable am/fm 1-chip radio wide operating supply voltage range: v cc = 3v ~ 12v (approximately) (depending on the internal regulator tolerance) recommended operating suply voltage: v cc = 4.5v ~ 9v ordering information on using ac line as an internal shunt regulator mode, it is possible to use low cost application without a transformer (approximately 42ma). if amp gain is determined by dc voltage appeared at ic pin 16. power output: p o =0.28w (min.) at thd =10% (v cc = 5.5v/8 w ). block diagram fig. 1 device package operating temperature KA22427C 16-dlp-300a 20 c ~+70 c v cc r l 4.5v 6.0v 7.5v 9.ov line operated 8 w w o o o x x 16 w w o o o o x 45 w w o o o o o
KA22427C am/fm 1 chip radio absolute maximum ratings (ta = 25 c ) electrical characteristics (ta =25 c, v cc = 5.5v, fm = 1khz, am: f=1mhz, 30% mod, fm: f =10.7mhz d f = 22.5khz, unless otherwise specified) character istic symbol value unit s upply voltage power dissipation supply current thermal resistance junction to ambient operating temperature storage temperature v cc p d i cc r eja t opr t stg 13 600 44 100 -20 ~ +70 -55 ~ +150 v mw ma c /w c c characteristic symbol test conditions min typ max unit qulescent circuit current i ccq sw: fm, v cc = 3v sw: fm, v cc = 9v 7 10 12 17 17 23 ma fm pin 16 terminal voltage v 16 (fm) sw: fm, v cc = 9v, v i = 0 2.0 2.4 3.1 v -3db limiting sensitivity v i(lim) sw: fm, -3db v 16 = 2.4v, v r min 57 db internal regulated vtg. v cc sw: am, i cc = 42ma 12 13.2 14.0 v pin 16 voltage v 16 (am) sw: am, v cc = 9v, v i = 0 1.4 1.9 v am maximum sensitivity s max sw: am, v cc = 12v v i = 37db m , r l = 8 w 1.5 3.0 v signal to noise ratio s/n v i = 37.5db m , r l = 8 w p o = 50mw 15 20 db output power p o f = 1khz, thd = 10% v r min, r l = 8 w 0.28 w pwr amp total harmonic distortion thd i cc = 42ma, r l = 45 w f = 1khz, v o = 2v v r min 0.5 4.0 % voltage gain g v f = 1khz, r l = 8 w p o = 50mw 41 db
KA22427C am/fm 1 chip radio test circuit
KA22427C am/fm 1 chip radio application information - external components influence smaller than typ greater than typ r5 am gain control 47k w (33k ~ ) low am gain agc distortion increase, high gain r7 fm detector damper 4.7k w low detector output, stable if gain, low fm gain sharp if amp curve r8 fm gain adjust 470 low fm gain high gain, but noise increase c2 if bypass 0.022 m f should not be less than 0.005 m f high if gain, s/n ratio degrade c4 if filter 0.022 m f removal may cause if oscillation no influence c7 am bypass 0.047 m f low gain using over 1 m f will cause fm distortion at small signal c9 detector filter 0.01 m f unstable if amp oscillation poor fm frequency response c10 audio coupling 0.022 m f lower sensitivity, poor low frequency response bass boost affects de-emphasis curve c11 audio input high-cut 0.001 m f audio oscillation poor response c12 ripple filter 220 m f poor frequency response & low gain improve ac hum c13 audio output coupling 470 m f poor low frequency response can achieve optimum output power c14 power line filter 470 m f poor ac hum improve ac hum c15 fm detector phase-shift 10pf narrow if bandwidth wide if bandwidth c16 high freq. (if) bypass 0.047 m f removal will cause fm oscillation no influence c17 an agc time constant and high frequency (if) bypass 0.047 m f not recommend to charge parts number purpose typical
KA22427C am/fm 1 chip radio function description (pin 16 dc voltage) 1. if gain grouping table (1) test condition: v cc = 9v (pin 13). pin 8 resistance (am) =47k w pin 16 resistance (fm) = 1.2k w (2) grouping table 2. if gain is determined by dc voltage appeared at ic pin 16. the dc voltage at pin 16 to the following values: am = 1.4 ~ 1.65v (dc) fm = 1.9 ~ 2.10v (dc) am gain can be adjusted by the loading resistor vatue of pin 8 (am) from 33k w to infinity. fm gain can be adjusted by the loading resistor value of pin 16 (fm) from 3k w to 680 w . recommended resistance (pin 8, pin 16). pin 8 (am) = 47k w pin 16 (fm) = 470 w v16(am) v16(fm) 1.4 - 1.7v 2.4 - 2.85v 2b
KA22427C am/fm 1 chip radio note: 1. sw1: am position. 2 . ? m a r k i n g : v a l u e o f c a n d r h a v fig . 3. 1k 1000 p application circuit
KA22427C am/fm 1 chip radio coil specification 1 coil no. f q o turns c o connections t1 10.7mhz 120 1-3 8t 150pf t2 10.7mhz 70min 1-3 4-6 11t 2t 75 5pf t3 (t6) 455khz 80min 1-2 2-3 4-6 91t 55t 6t 180 5pf t4 10.7mhz 45min 1-3 11t 82 3pf t5 10.7mhz 25min 1-3 4-6 7t 7t 180pf l1 am local oscillator 90min 1-3 4-6 86t 7t l2 am ant 200 1-2 (l = 560 m ) 3-4 138t 9t l3 fm ant 0.8 mm f uew tap 5t 0.5t l4 trap 0.32 mm f uew 10t l5 fm oscillator 0.8 mm f uew 4t |? h
KA22427C am/fm 1 chip radio application circuit 2 fig. 4.
KA22427C am/fm 1 chip radio coil specification 2 coil no. f q 0 turns c.l. connections t1 10.7mhz 90 1-3 4-6 113 82pf t2 10.7mhz 60 1-3 4-6 52 390 pf t3 455 khz 100 1-2 2-3 4-6 127 28 10 180 pf t4 10.7 mhz 45(min) 1-3 11 82 pf t5 10.7 mhz 25(min) 1-3 4-6 77 180 pf t6 455 khz 100 1-2 2-3 50 50 390 pf l6 796khz 100 1-3 4-6 100 10 360 m h
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