HT9011 FM IF Detector Preliminary Features · · · · · · Operating voltage: 1.1V~3.5V Constant power supply voltage can be generated by externally adding a transistor: VREG=1.0V typ. Alarm function sensitivity: VALM=1.1V typ. Low current consumption: ICCQ=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 signals Built-in battery-saving function for longer battery life time High transmission rate: 1200 bps 20-pin SSOP package (0.65mm Pitch) · · · · General Description The HT9011 is designed for FM communication system devices. It combines a paging system, mixer, IF limiter, Quadrature detector, operation amplifier, comparator and more. The HT9011 could provide the customer¢s PAGER system with total solution along with Holtek¢s POCSAG Pager Controller series products. Block Diagram M IX I G N D R E G O R E G C R E G . A L M F S K O C H G F S K C O M P . A L A R M B S Q u ic k C h a rg e L P F O L P F I A M P M ix e r IF A m p O S C O S C I O S C O Q u a d D e t M IX O V C C IF IN D E C F S K R 1 IF O Q U A D A F O March 1, 2000 Preliminary HT9011 Pin Assignment O S C I 1 2 0 M IX I O S C O 2 1 9 G N D M IX O 3 1 8 R E G O V C C 4 1 7 R E G C IF IN 5 1 6 A L M D E C 6 1 5 F S K O F S K R 7 1 4 C H G IF O 8 1 3 B S Q U A D 9 1 2 L P F O 1 0 1 1 L P F I A F O H T 9 0 1 1 2 0 S S O P Pin Description Pin No. Pin Name I/O Description These pins are connected to the external parts of an oscillating circuit. 1 OSCI I 2 OSCO O 3 MIXO O Mixer output pin. Connect a 455kHz ceramic filter between this pin and the IFIN pin. 4 VCC ¾ 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 ²H² Normal Operation ²L² Battery-saving 2 March 1, 2000 Preliminary Pin No. Pin Name I/O HT9011 Description Control pin for quick charge-discharge circuit. 14 CHG I ²H² turn on quick charge-discharge ²L² turn off quick charge-discharge 15 FSKO O FSK NRZ data output 16 ALM O Output pin for Low Voltage Alarm At [email protected], this pin becomes ²H² (@VCC) 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 ¾ Negative power supply, ground 20 MIXI I MIXER Input terminal Absolute Maximum Ratings Power Supply Voltage............VCC-0.3V to 4.0V Power Dissipation ..................................730mW Operating Temperature range ........0°C to 45°C Storage Temperature.................-55°C to 150°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² 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 reliability. 3 March 1, 2000 Preliminary HT9011 Electrical Characteristics Ta=25°C, Unless oterwise specified, Fin (MIX)=21.7MHz, Fin(IF)=455kHz, Fdev=±4kHz, Fin=600Hz Symbol Parameter Test Conditions Conditions VDD Min. Typ. Max. Unit Iccq Quiescent Current 1.4V ¾ 1.1 1.6 mA Icco Supply Current at Battery Saving 1.4V ¾ 0 5 mA GMV MIXER Conversion Gain 1.4V 9 12.5 16 dB IP MIXER 3rd Interception 1.4V point ¾ -10 ¾ dBm 1.4V ¾ 5 ¾ kW R(IF)in IF Amp Input Resistance 1.4V ¾ 2 ¾ kW S/N1 Signal to Noise Ration 1 1.4V MIX IN, VIN (MIX)=60dBmEMF ¾ 63 ¾ dB S/N2 Signal to Noise Ration 2 1.4V IF IN, VIN (IF)=60dBmEMF ¾ 63 ¾ dB S/N3 Signal to Noise Ration 3 1.4V IF IN, VIN (IF)=22dBmEMF ¾ 25 ¾ dB Vi(LIM)1 -3dB Limiting Sensitivity 1 1.4V MIX input ¾ 14 ¾ dBmEMF Vi(LIM)2 -3dB Limiting Sensitivity 2 1.4V IF input ¾ 23 27 dBmEMF VOD Detected Output Level 1.4V VIN (IF)=60dBmEMF 30 45 60 mVrms AMR AM Rejection Ratio 1.4V VIN (IF)=60dBmEMF AM=30% ¾ 50 ¾ dB DR FSK OUT Duty Ratio 1.4V VIN (IF)=60dBmEMF 40 50 60 % VALM Alarm Detected Voltage 1.4V 1.05 1.1 1.15 V VALML ²L² Level Output Voltage 1.4V I=100mA (ALM) ¾ ¾ 0.4 V IALM ²H² Level Output Current 1.4V (ALM) ¾ ¾ 2 mA VFSKL ²L² Level Output Voltage 1.4V I=100mA (FSK) ¾ ¾ 0.4 V IFSK ²H² Level Output Current 1.4V (FSK) ¾ ¾ 2 mA VREC Constant Voltage Output 1.4V 0.95 1.0 1.05 V R(MIX)in MIX Input Resistance 4 March 1, 2000 Preliminary HT9011 Functional Description Battery-saving function Battery low alarm function The battery-saving function is controlled by the pin ²BS² and the battery consumption is minimized by reducing the current consumption. If the pin is logic LOW, the HT9011 enters the battery-saving mode, otherwise HT9011 is in normal operation state. In case the HT9011 is battery powered, when the power supply voltage goes low to about 1.1V, the output of the pin ²ALM² 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. FSK NRZ output Constant voltage regulator for external part power supply The HT9011 has two built-in operation amplifiers. One of these operation amplifiers is connected inside the IC to the NRZ comparator. The NRZ comparator can output the input signal waveform as a square wave. The NRZ comparator output is an open collector. If the IC interfaces with CMOS devices, the possible connection is shown below. V C C 4 1 4 Externally connecting the transistor as shown in the figure below, the output ²REGO² could be used constantly as 1.0V regulator output. At the battery-saving mode, the regulator is turned OFF . V re g 1 .5 V V + fo r C M O S IC F S K O C C C M O S IC V C C 2 N 3 9 0 6 1 .0 m F R E G O R E G C Local oscillator circuit The HT9011 local oscillator circuit is of Colpitts type oscillator composed of internal emitter follower circuit and an external X¢tal. The transistor is connected externally as shown in the figure below. Resistor ²R² may be needed to increase the current of the local oscillator circuit in order to compose the overtone oscillator and improve its stability. It is recommended that the resistor be connected between OSCI and REGO to provide battery-saving mode. 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 ²FSKR² arrives at the reference voltage is delayed by a time constant determined by the capacitor connected to the pin ²FSKR² 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 discharging the capacitor connected to the pin ²FSKR². By using the quick charge-discharge circuit, the delay time for the ²FSKR² pin to be of the same level with the ²LPFO² pin could be minimized, hence, erroneous FSK NRZ output signal is prevented. O S C I 1 R E G O 2 2 k W 2 1 .8 5 5 M H z 5 O S C O 2 5 6 p F 4 7 p F R March 1, 2000 Preliminary HT9011 Application Circuits Pager RF board (149.7MHz) 2 p F 3 9 p F 2 ~ 1 0 p F 0 .0 0 1 m F 2 2 p F 5 p F 0 .0 1 m F 5 6 k W 1 0 0 W 2 0 p F 3 1 0 3 3 3 1 0 3 3 8 2 m H 0 .0 0 1 m F 0 .1 m F 1 2 k W 6 8 0 n H 0 .0 1 m F N O 2 0 p F 3 .9 k W T P 2 ~ 1 0 p F T P 1 2 .2 k W 3 p F N O 1 2 p F 5 6 0 W 1 2 W 9 p F 3 1 0 3 3 3 9 n H 1 2 0 n H 0 .0 0 1 m F 2 p F 0 .0 1 m F 6 p F 4 7 k W 2 .7 m H 1 .5 V B + T P 4 .7 k W 2 7 3 4 2 0 p F 2 1 .8 5 5 M H z + 5 6 p F 1 4 7 p F 2 3 1 4 3 4 T P 3 T P 5 C F W M 4 5 5 F 5 2 0 .1 m F 0 .1 m F 6 1 0 m F 7 + 2 2 p F 3 .3 k W 0 .0 0 1 m F O S C I M IX I O S C O G N D M IX O R E G O V C C R E G C IF IN A L M D E C F S K O F S K R 8 4 5 5 C 2 8 A F O 1 5 1 4 1 3 L P F I T P T P 3 B A L 1 0 k W B + D A T A 1 0 k W B S 2 4 7 k W B S 1 1 0 k W 1 1 5 6 p F 6 8 k W 6 8 k W 0 .0 0 3 3 m F 1 2 0 .1 m F 2 N 3 9 0 6 1 6 L P F O H T 9 0 1 1 1 9 1 7 B S Q U A D 0 .1 m F 2 0 1 8 C H G IF O 9 1 0 6 0 .0 1 m F 1 8 k W 2 2 k W 1 0 m F 1 2 0 W 0 .0 1 m F 6 8 k W March 1, 2000 Preliminary HT9011 Holtek Semiconductor Inc. (Headquarters) No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C. Tel: 886-3-563-1999 Fax: 886-3-563-1189 Holtek Semiconductor Inc. (Taipei Office) 5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C. 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 Copyright ã 2000 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes 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. 7 March 1, 2000