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| FM IF RECEIVER S1T8513A INTRODUCTION The S1T8513A is designed for FM IF Detection on the pager set. It includes a voltage regulator, low battery detection circuit, Mixer, Oscillator, FSK comparator and limiting IF Amplifier. 20-SSOP-225 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: 1200 / 2400bps FSK Data reception Package type: 20-SSOP (0.65mm) ORDERING INFORMATION Device S1T8513A02-V0B0 Package 20-SSOP-225 Operating Temperature -20C to +70C BLOCK DIAGRAM MI 20 GND 19 REGO REGC 18 17 AO 16 FSKO 15 QC 14 BSC 13 LPFO 12 LPFI 11 1.0V Reg 2'nd MIX FSK COMP. Quick Charge filter AMP Alarm audio AMP X-tal Osc 1 2 3 4 Limiting IF Amplifier 5 6 7 8 Quad Detector 9 10 OSCI OSCO MO Vcc LI LD FSKI IFO QD RAO 1 S1T8513A FM IF RECEIVER PIN CONFIGURATION OSCI OSCO MO Vcc LI LD FSKI IFO QD RAO 1 2 3 4 5 6 7 8 9 10 20 19 18 17 MI GND REGO REGC AO FSKO QC BSC LPFO LPFI KA8513B S1T8513A 16 15 14 13 12 11 2 FM IF RECEIVER S1T8513A PIN DESCRIPTION Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol OSCI OSCO MO VCC LI LD FSK1 IFO QD RAO LPFI LPFO BSC QC FSKO AO REGC REGO GND MI Description Oscillator input. The oscillator is an internally-biased colpitts type. Oscillator output. Mixer output pin. Output impedance 2k. Connect a 455kHz filter between this pin and the LI. VCC pin. IF limiter amplifier input. Input impedance 2k. Bypass capacitor connect pin for the IF limiter amplifier. Differential Amp. reference input on the FSK comparator. IF Amp output. Quadrature detection, phase shiftier pin. Recovered audio signal output. Low pass filter amplifier input. Bias is supplied from pin 10. Low pass filter amplifier output. Battery saving control pin. High: Battery saving off. Low: Battery saving on Quick charge control pin. High: Quick charge-discharge on. Low: Quick charge-discharge off. FSK signal output pin. Alarm output. This pin becomes High when VCC drops below 1.05V. S1T8513A has an internal PNP transistor. But, it also can support an external PNP transistor to control the power. Regulated voltage output. Ground. Mixer input impedance 5k. ABSOLUTE MAXIMUM RATINGS Characteristic Max. Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC (MAX) PD TOPR TSTG Value 4 800 -20 -- +70 -55 -- +125 Unit V mW C C 3 S1T8513A FM IF RECEIVER ELECTRICAL CHARACTERISTICS (VCC = 1.4V 5%, fIN (2MIX) = 21.4MHz, fDEV = 4.8kHz, fMOD = 600Hz, Ta = 25C, unless otherwise specified) Characteristic Operating current Symbol ICCN ICCS Alarm Detection Voltage Alarm Low Level Output Voltage Alarm High Level Leakage Current FSK Low Level Output Voltage FSK High Level Leakage Current Regulator Output Voltage Quick Charge Current Input for -3dB Sensitivity Input for -12dB SINAD Sensitivity Recovered Audio Output Voltage Mixer Conversion Voltage Gain Signal to Noise Ratio Total Harmonic Distortion Mixer 3rd Order Intercept Point Mixer Input Resistance Limiting Amplifier Input Resistance AM Rejection Ratio Data Shaping Output Duty Ratio VAD VO (AL) ILKG (AL) VL (FSK) ILKG (FSK) VO (REG) IC VLIM VI (SEN) VO (RAO) GV (M) S/N THD 3RD RI (MIX) RI (LA) AMR DR Mixer Input IF Input VIN (2MIX) = 500Vrms Ceramic Filter loss = -1dB VIN (2MIX) = 500Vrms VIN (2MIX) = 500Vrms - - - VIN (2MIX) = 5Vrms (AM = 300%) VIN (2MIX) = 500Vrms I = 100A - - - I = 100A - Test Conditions No Input Signal Battery Saving - Min. - - 1.0 - - - - 0.95 50 - - 37 8 38 - - 3.5 1.4 25 40 Typ. 1.1 0 1.05 - - - - 1.0 70 2.5 6.0 55 12 55 2.0 -10 5 2 40 50 Max. 1.6 10 1.1 0.4 2 0.4 2 1.05 - 7.5 18.0 73 16 - 3.5 - 6.5 2.6 - 60 Unit mA A V V A V A V A Vrms Vrms mVrms dB dB % dBm k k dB % 4 FM IF RECEIVER S1T8513A APPLICATION CIRCUIT Alarm out Reg.out VCC FSK out + 2.2 R9 100K 100K H LH L 68K 68K LPFI 11 51 100P MI 20 19 0.01 GND 18 REGO 17 REGC 16 AO 15 FSKO 14 QC 13 BSC 12 LPFO 3.3n 560P 1.0V Regulator 2' d n 2'dn MIX MAX Quick Charge FSK Alarm COMP AMP Filter AMP Audio X-tal Osc 1 2 3 4 68K Limiting IF Amplifier 5 6 7 8 Quad Detector 9 10 OSCI OSCO MO C3 Vcc C4 IFI IF DEC FSKI + 10 IFO C9 QD RAO 56P 20.945MHz 33P CFMW455E 0.1 22P CDBM455 Vcc R2 3.3K + 10 5 S1T8513A FM IF RECEIVER NOTES 6 |
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