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ht9142 fm if detector block diagram pin assignment rev. 1.00 1 january 30, 2002 features operating voltage: 1.1v~3.5v constant power supply voltage can be generated by externally adding a transistor: v reg =1.0v typ. alarm function sensitivity: v alm =1.1v typ. low current consumption: i ccq =1.1ma typ. built-in 2nd stage mixer for double conversion method mixer operating frequency: 10mhz~50mhz built-in low-pass filter and waveform shaping circuit enable the extraction of fsk signals from voice sig - nals built-in battery-saving function for longer battery life time high transmission rate: 1200 bps 20-pin tssop package (0.65mm pitch) general description the ht9142 is designed for fm communication system devices. it combines a paging system, mixer, if limiter, quadrature detector, operation amplifier, comparator and more. the ht9142 could provide the customer s pager system with total solution along with holtek s pocsag pager controller series products. the ht9142 can also use on holtek s rf key - board/mouse applications.

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pin description pin no. pin name i/o description 1 osci i these pins are connected to the external parts of an oscillating circuit. 2 osco o 3 mixo o mixer output pin. connect a 455khz ceramic filter between this pin and the ifin pin. 4 vcc positive power supply 5 ifin i input terminal for if amp. 6 dec i bias decoupling 7 fskr i reference input of differential amplifier for waveform shaping. connect the capacitor externally. 8 ifo o if amplifier output pin. connect the discriminator through the coupling capacitor. 9 quad i fm demodulator phase shift input pin connected to a quadrature detector phase shifter. 10 afo o fm demodulator output pin 11 lpfi i low pass filter input pin 12 lpfo o low pass filter output pin 13 bs i battery-saving control pin h normal operation l battery-saving 14 chg i control pin for quick charge-discharge circuit. h turn on quick charge-discharge l turn off quick charge-discharge 15 fsko o fsk nrz data output 16 alm o output pin for low voltage alarm at v cc 1.1v, this pin becomes h ( v cc ) and can indicate deterioration of battery. 17 regc o control pin of external transistor for regulator of external power supply. externally connect the pnp transistor 18 rego o output voltage monitoring pin of regulator for external power supply. 19 gnd negative power supply, ground 20 mixi i mixer input terminal absolute maximum ratings power supply voltage........................v cc 0.3v to 4.0v power dissipation..............................................730mw operating temperature range.....................0 cto45 c storage temperature ............................ 55 cto150 c note: these are stress ratings only. stresses exceeding the range specified under absolute maximum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil - ity. ht9142 rev. 1.00 2 january 30, 2002
electrical characteristics ta=25 c, unless oterwise specified, f in (mix)=21.7mhz, f in (if)=455khz, f dev = 4khz, f in =600hz symbol parameter test conditions min. typ. max. unit v dd conditions iccq quiescent current 1.4v 1.1 1.6 ma icco supply current at battery saving 1.4v 05 a gmv mixer conversion gain 1.4v 9 12.5 16 db ip mixer 3rd interception point 1.4v 10 dbm r(mix)in mix input resistance 1.4v 5 k
r(if)in if amp input resistance 1.4v 2 k
s/n1 signal to noise ration 1 1.4v mix in, v in (mix)=60db emf 63 db s/n2 signal to noise ration 2 1.4v if in, v in (if)=60db emf 63 db s/n3 signal to noise ration 3 1.4v if in, v in (if)=22db emf 25 db vi(lim)1 3db limiting sensitivity 1 1.4v mix input 14 db emf vi(lim)2 3db limiting sensitivity 2 1.4v if input 23 27 db emf v od detected output level 1.4v v in (if)=60db emf 30 45 60 mvrms amr am rejection ratio 1.4v v in (if)=60db emf am=30% 50 db dr fsk out duty ratio 1.4v v in (if)=60db emf 40 50 60 % v alm alarm detected voltage 1.4v 1.05 1.1 1.15 v v alml l level output voltage (alm) 1.4v i=100 a 0.4 v i alm h level output current (alm) 1.4v 2 a v fskl l level output voltage (fsk) 1.4v i=100 a 0.4 v i fsk h level output current (fsk) 1.4v 2 a v rec constant voltage output 1.4v 0.95 1.0 1.05 v ht9142 rev. 1.00 3 january 30, 2002
ht9142 rev. 1.00 4 january 30, 2002 functional description battery-saving function the battery-saving function is controlled by the pin bs and the battery consumption is minimized by reducing the current consumption. if the pin is logic low, the ht9142 enters the battery-saving mode, otherwise ht9142 is in normal operation state. fsk nrz output the ht9142 has two built-in operation amplifiers. one of these operation amplifiers is connected inside the ic to the nrz comparator. the nrz comparator can out - put the input signal waveform as a square wave. the nrz comparator output is an open collector. if the ic in - terfaces with cmos devices, the possible connection is shown below. quick charge-discharge circuit if an fsk signal inputs during the brief transition from battery-saving state to normal operation state, the time that the pin fskr arrives at the reference voltage is delayed by a time constant determined by the capacitor connected to the pin fskr and the internal resistor. sometimes, the output signal becomes erroneous due to some error in the comparator input voltage. such a case could be avoided by quickly charging or discharg - ing the capacitor connected to the pin fskr . by using the quick charge-discharge circuit, the delay time for the fskr pin to be of the same level with the lpfo pin could be minimized, hence, erroneous fsk nrz output signal is prevented. battery low alarm function in case the ht9142 is battery powered, when the power supply voltage goes low to about 1.1v, the output of the pin alm rises up to about 1.1v and the battery voltage can be monitored by other devices. the output is an open collector similar to fsk nrz output. constant voltage regulator for external part power supply externally connecting the transistor as shown in the fig - ure below, the output rego could be used constantly as 1.0v regulator output. at the battery-saving mode, the regulator is turned off. local oscillator circuit the ht9142 local oscillator circuit is of colpitts type os- cillator composed of internal emitter follower circuit and an external x tal. the transistor is connected externally as shown in the figure below. resistor r may be needed to increase the current of the local oscillator cir- cuit in order to compose the overtone oscillator and im- prove its stability. it is recommended that the resistor be connected between osci and rego to provide bat- tery-saving mode. 0 1 ! !
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application circuits pager rf board (151.35mhz) ht9142 rev. 1.00 5 january 30, 2002 & ' ( ) ( * ( + ( , ( - ( . ( / ( & ( ( ( & / . - , + * ) ( ' 3 3 / , * , * ( - ' ' # ( , * . + ! $ !
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rf mouse receiver ht9142 rev. 1.00 6 january 30, 2002 & ' ( ) ( * ( + ( , ( - ( . ( / ( & ( ( ( & / . - , + * ) ( ' , * , * ! $ !
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ht9142 rev. 1.00 7 january 30, 2002 copyright 2002 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek as - sumes no responsibility arising from the use of the specifications described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek reserves the right to alter its products without prior notification. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw. holtek semiconductor inc. (headquarters) no.3, creation rd. ii, science-based industrial park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (sales office) 11f, no.576, sec.7 chung hsiao e. rd., taipei, taiwan tel: 886-2-2782-9635 fax: 886-2-2782-9636 fax: 886-2-2782-7128 (international sales hotline) holtek semiconductor (hong kong) ltd. rm.711, tower 2, cheung sha wan plaza, 833 cheung sha wan rd., kowloon, hong kong tel: 852-2-745-8288 fax: 852-2-742-8657 holtek semiconductor (shanghai) inc. 7th floor, building 2, no.889, yi shan rd., shanghai, china tel: 021-6485-5560 fax: 021-6485-0313 http://www.holtek.com.cn holmate technology corp. 48531 warm springs boulevard, suite 413, fremont, ca 94539 tel: 510-252-9880 fax: 510-252-9885 http://www.holmate.com

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