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| NJM2592 Under Development 470MHz INPUT 455kHz FM IF DEMODULATOR GENERAL DESCRIPTION The NJM2592 is a low-voltage, low-current FM IFdemodulator IC with 455kHz(standard) IF frequency. It includes an oscillator, mixer, limiting amplifier, quadrature detector,active filter, and FSK comparator. The NJM2592 also has a RSSI circuit and RSSI comparator for carrier sense. PACKAGE OUTLINE FEATURES Low Operating Voltage 1.8V to 5.5V Low Operating Current 3.5mA at V+ =2.0V Operating Frequency up to 470MHz (reference value) IF Input Frequency 455kHz (standard) Ceramic Discriminator or LC resonant Circuit FSK Comparator with Open-collector Output Quick Charge /Discharge Circuit for FSK Reference Voltage Bipolar Technology Package Outline SSOP20 NJM2592V BLOCK DIAGRAM MIX IN 20 SENSE RSSI CARRIER FSK CHARGE LPF SW OUT GND LEVEL OUT SENSE OUT 19 18 17 16 15 14 13 LPF IN 12 AF OUT 11 MIXER RSSI COMP FSK COMP BUFFER FILTER AMP RSSI CHARGE QUAD DET OSC IFAMP IF AMP 1 OSC (B) 2 OSC (E) 3 MIX OUT 4 V+ 5 IF IN 6 DEC 7 FSK REF 8 NC 9 IF OUT 10 QUAD IN Ver.2003-05-15 -1- NJM2592 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power Dissipation Operating Temperature Storage Temperature SYMBOL V+ PD Topr Tstg RATINGS 7.0 300 - 40 to +85 - 40 to +125 (Ta=25C) UNIT V mW C C RECOMMENDED OPERATIONAL CONDITION PARAMETER Supply Voltage SYMBOL V+ TEST CONDITIONS MIN. 1.8 TYP. 2.0 MAX. 5.5 (Ta=25C) UNIT V ELECTRICAL CHARACTERISTICS PARAMETER Current Consumption Mixer Conversion Gain1 Mixer Conversion Gain2 Mixer 3rd Order Intercept Mixer Input Resistance Mixer Input Capacitance Mixer Output Resistance Signal to Noise Ratio 1 Signal to Noise Ratio 2 Signal to Noise Ratio 3 -3dB limiting Sensitivity AM Rejection Raito IF Amplifier Input Resistance RSSI Output Voltage Demodulated Output Level (Ta=25C, V+=2V, fmix=470MHz, fif=455KHz, fmod=600Hz, fdev=4KHz, unless otherwise noted) SYMBOL Iccq Gmix1 Gmix2 IP RinM CinM R oM S/N1 S/N2 S/N3 VIn(lim) AMR RinIF Vrssi Vod IF input Vi=40dBuVEMF IF input Vi=60dBuVEMF Mixer input Vin=60dBuVEMF Mixer input Vin=60dBuVEMF Mixer input Vin=25dBuVEMF IF input IF input, AM=30% Vi=60dBuVEMF fmix=470MHz fmix=470MHz TEST CONDITIONS No Signal Pin3 is terminated with 2k. Pin3 is terminated with 2k. MIN. TYP. 3.5 20 TBD 95 50 TBD 2 60 60 30 22 50 2 0.9 60 MAX. UNIT mA dB dB dBuV pF k dB dB dB dBuVEMF dB k V mVrms -2- Ver.2003-05-15 NJM2592 Oscillator Circuit Crystal and LC resonant Element CARRIER FSK RSSI SENCE OUT CHARGE Switch V+ V + BPF LNA RF 20 IN 19 18 17 16 15 14 13 12 11 MIXER RSSI COMP FSK COMP BUFFER FILTER AMP RSSI CHARGE QUAD DET OSC IFAMP IF AMP 1 OverTone X'tal 2 3 4 V 5 + 6 CDEC 7 + 8 CREF 9 10 DET TANK IF Filter V+ PLL Frequency Synthesizer IC MIXER BUFFER OSC 1 2 3 4 V 5 + PLL Synthesizer [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. Ver.2003-05-15 -3- |
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