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| FM IF RECEIVER WITH RSSI S1T8514B INTRODUCTION The S1T8514B 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. Also S1T8514B provides the RSSI function for RF level monitoring. 20-SSOP-225 FEATURES * * * * * * * * * Built-in RSSI function Operating voltage range: VCC = 1.1 to 4.0V Low current consumption: ICC = 1.5mA Low battery detection circuit (alarm function): 1.05V Voltage regulator: Vreg = 1.0V (Typ.) Mixer operating frequency: 10 to 50MHz High transmitting rate: 1200 / 2400bps FSK Data reception Package type: 20-SSOP (0.65mm) ORDERING INFORMATION Device S1T8514B01-V0B0 Package 20-SSOP-225 Operating Temperature -20C to +70C 1 S1T8514B FM IF RECEIVER WITH RSSI BLOCK DIAGRAM MI 20 GND 19 REGO 18 REGC 17 AO 16 FSKO 15 QC 14 BSC 13 LPFO 12 LPFI 11 1.0V Regulator 2nd MIX FSK COMP. Quick Charge Filter AMP Alarm X-tal Osc 1 2 3 4 limitting IF Amplifier 5 6 7 Quad Detector RSSI 8 9 10 OSCI OSCO MO Vcc LI LD FSKI QD RAO RSSI PIN CONFIGURATION OSCI OSCO MO Vcc LI LD FSKI QD RAO RSSI 1 2 3 4 5 6 7 8 9 10 20 19 18 17 MI GND REGO REGC AO FSKO QC BSC LPFO LPFI KA8514A S1T8514B 16 15 14 13 12 11 2 FM IF RECEIVER WITH RSSI S1T8514B 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 FSKI QD RAO RSSI LPFI LPFO BSC QC FSKO AO REGC REGO GND MI Description Oscillator input (Base). The oscillator is an internally biased colpitts type. Oscillator output. Mixer output (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. Quadrature detection, phase shifter input. Recovered audio signal output. Output pin for RSSI. This pin detects RF level by monitoring the limiter amplifier. Low pass filter a amplifier input. Bias is supplied from pin 9. 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 belows 1.05V. S1T8514B 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 to +70 -55 to +125 Unit V mW C C 3 S1T8514B FM IF RECEIVER WITH RSSI 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 amp input resistance AM rejection ratio Data shaping output duty RSSI output voltage RSSI output resistance VAD VO (AL) ILKG (AL) VL (FSK) ILKG (FSK) I = 100A VOREG IC VLIM VI (SEN) VO (RAO) GV (M) S/N THD 3RD RI (MIX) RI (LA) AMR DR VRSSI RRSSI Mixer Input FM Input VIN (2MIX) = 500Vrms Ceramic Filter loss = -1dB - - - - - VIN (2MIX) = 5Vrms (AM = 300%) VIN (2MIX) = 500Vrms VIN (2MIX) = 1m Vrms (AM = 300%) - - - I = 100A - - Test Conditions No Input Signal Battery Saving - Min. - - 1.0 - - - - 0.95 56 - - 33 8 38 - - 3.5 1.4 25 40 0.49 80 Typ. 1.2 0 1.05 - - - - 1.0 70 2.5 6.0 55 12 55 2.0 -10 5 2 40 50 0.7 100 Max. 1.7 10 1.1 0.4 2 0.4 2 1.05 - 7.5 18.0 77 16 - 3.5 - 6.5 2.6 - 60 0.91 120 Unit mA A V V A V A V A Vrms Vrms mVrms dB dB % dBm k k dB % V k 4 FM IF RECEIVER WITH RSSI S1T8514B APPLICATION CIRCUIT Alarm out FSK out Reg.out RF Input + 2.2 Vcc 100K 100K H L H L 68K 0.01 68K 3.3n 51 1000P MI GND 20 19 REGO 18 REGC 17 AO 16 FSKO 15 QC 14 BSC 13 LPFO 12 LPFI 11 560P 1.0V Regulator 2'nd MIX FSK COMP. Quick Charge Filter AMP Alarm 68K X-tal Osc limitting IF Amplifier Quad Detector RSSI 1 2 3 4 5 6 LD 7 8 9 10 OSCI OSCO MO Vcc LI FSKI QD RAO RSSI + 20.945MHz 56P 0.1 33P CFMW455E CDBM 455 10 3.3K RSSI Vcc + 10 1F 5 S1T8514B FM IF RECEIVER WITH RSSI NOTES 6 |
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