fm if receiver ka8513b/c 1 introduction the ka8513b is designed for fm if detection on the pager set. it includes a voltage regulator, low battery detection circuitry, mixer, oscillator, fsk comparator and limiting if amplifier. features ? operating voltage range: 1.0 ~ 4.0v ? typical supply current: 1.1ma at 1.4v ? low battery detection circuit (alarm function): 1.05v ? voltage regulator: vreg = 1.0v (typ.) ? mixer operating frequency: 10 ~ 50mhz ? high transmitting rate: 1200bps / 2400bps ? fsk data reception ? package type: 20-ssop (0.65mm) ordering information block diagram device package operating temperature ka8513b/c 20-ssop-225 - 20 c ~ +70 c 20 - ssop - 225 #1 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 2?nd mix x-tal osc 1.0v reg alarm limiting if amplifier quick charge quad detector mi gnd rego regc ao fsko qc bsc lpfo lpfi osci osco mo vcc li ld fski ifo qd rao filter amp audio amp fsk comp.
ka8513b fm if receiver 2 pin configuration ka8513b osci osco mo vcc li ld fski ifo qd rao mi gnd rego regc ao fsko qc bsc lpfo lpfi 3 4 5 6 7 8 9 10 20 19 `18 17 16 15 14 13 12 11 1 2
fm if receiver ka8513b/c 3 pin description absolute maximum ratings pin no symbol description 1 osci oscillator input. the oscillator is an internally-biased colpitts type. 2 osco oscillator output. 3 mo mixer output pin. output impedance ? 2k w . connect a 455khz filter between this pin and the li. 4 v cc v cc pin. 5 li if limiter amplifier input. input impedance ? 2k w . 6 ld bypass capacitor connect pin for the if limiter amplifier. 7 fski differential amp reference input on the fsk comparator. 8 ifo if amp output. 9 qd quadrature detection, phase shifter pin. 10 rao recovered audio signal output. 11 lpfi low pass filter amplifier input. bias is supplied from pin 10. 12 lpfo low pass filter amplifier output. 13 bsc battery saving control pin. high: battery saving off. low: battery saving on 14 qc quick charge control pin. high: quick charge-discharge on. low: quick charge-discharge off. 15 fsko fsk signal output pin. 16 ao alarm output. this pin becomes high when v cc drops below 1.05v. 17 regc ka8513b has an internal pnp transistor. but, it also can support an external pnp transistor to control the power. 18 rego regulated voltage output. 19 gnd ground. 20 mi mixer input impedance ? 5k w . characteristic symbol value unit max. supply voltage v cc (max) 4 v power dissipation p d 800 mw operating temperature t opr - 20 ~ +70 c storage temperature t stg - 55 ~ +125 c
ka8513b fm if receiver 4 electrical characteristics (v cc = 1.4v 5%, f in (2mix) = 21.4mhz, f dev = 4khz, f mod = 600hz, ta = 25 c, unless otherwise specified) characteristic symbol test conditions min. typ. max. unit operating current i ccn no input signal - 1.1 1.6 ma i ccs battery saving - 0 10 m a alarm detection voltage v ad - 1.0 1.05 1.1 v alarm low level output voltage v o (al) i = 100 m a - - 0.4 v alarm high level leakage current i lkg (al) - - - 2 m a fsk low level output voltage v l (fsk) i = 100 m a - - 0.4 v fsk high level leakage current i lkg (fsk) - - - 2 m a regulator output voltage v o (reg) - 0.95 1.0 1.05 v quick charge current i c - 50 70 - m a input for - 3db sensitivity v lim mixer input - 2.5 7.5 m vrms input for - 12db sinad sensitivity v i (sen) if input - 6.0 18.0 m vrms recovered audio output voltage v o (rao) v in (2mix) = 500 m vrms 37 55 73 mvrms mixer conversion voltage gain d g v (m) ceramic filter loss = - 1db 8 12 16 db signal to noise ratio s/n v in (2mix) = 500 m vrms 38 55 - db total harmonic distortion thd v in (2mix) = 500 m vrms - 2.0 3.5 % mixer 3rd order intercept point 3rd - - - 10 - dbm mixer input resistance r i (mix) - 3.5 5 6.5 k w limiting amplifier input resistance r i (la) - 1.4 2 2.6 k w am rejection ratio amr v in (2mix) = 5 m vrms (am = 30%) 25 40 - db data shaping output duty ratio dr v in (2mix) = 500 m vrms 40 50 60 %
fm if receiver ka8513b/c 5 application circuit 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 2 ? nd mix x-tal osc 1.0v regulator alarm limiting if amplifier quick charge comp fsk amp quad detector amp mi gnd rego regc ao fsko qc bsc lpfo lpfi osci osco mo ifi if dec fski ifo qd rao filter audio + + 51 1000p 2.2 m reg.out 100k 100k alarm out fsk out 0.01 m 68k 68k 3.3n 560p 68k 3.3k 10 m 22p cdbm455 vcc 10 m 0.1 m cfmw455e 33p 56p 20.945mhz c9 r2 vcc h l l h +
ka8513b fm if receiver 6 notes
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