NJM2592 Under Development 470MHz INPUT 455kHz FM IF DEMODULATOR GENERAL DESCRIPTION PACKAGE OUTLINE 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. NJM2592V 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 BLOCK DIAGRAM MIX IN SENSE RSSI CARRIER FSK CHARGE LPF SW OUT GND LEVEL OUT SENSE OUT 20 19 18 17 16 15 14 13 LPF IN AF OUT 12 11 MIXER RSSI COMP FSK COMP BUFFER RSSI OSC Ver.2003-05-15 FILTER AMP CHARGE QUAD DET IFAMP IF AMP 1 2 3 4 5 6 7 8 9 10 OSC (B) OSC (E) MIX OUT V+ IF IN DEC FSK REF NC IF OUT QUAD IN -1- NJM2592 ABSOLUTE MAXIMUM RATINGS PARAMETER (Ta=25°C) SYMBOL RATINGS UNIT Supply Voltage V+ 7.0 V Power Dissipation PD 300 mW Operating Temperature Topr - 40 to +85 °C Storage Temperature Tstg - 40 to +125 °C RECOMMENDED OPERATIONAL CONDITION PARAMETER Supply Voltage SYMBOL TEST CONDITIONS V+ (Ta=25°C) MIN. TYP. MAX. UNIT 1.8 2.0 5.5 V ELECTRICAL CHARACTERISTICS (Ta=25°C, V+=2V, fmix=470MHz, fif=455KHz, fmod=600Hz, fdev=±4KHz, unless otherwise noted) PARAMETER Current Consumption SYMBOL Iccq Mixer Conversion Gain1 Gmix1 Mixer Conversion Gain2 Gmix2 Mixer 3rd Order Intercept IP TEST CONDITIONS No Signal Pin3 is terminated with 2kΩ. Pin3 is terminated with 2kΩ. MIN. TYP. MAX. UNIT - 3.5 - mA - 20 - dB - TBD - dB - 95 - dBuV Mixer Input Resistance RinM fmix=470MHz - 50 - Ω Mixer Input Capacitance CinM fmix=470MHz - TBD - pF Mixer Output Resistance R oM - 2 - kΩ Signal to Noise Ratio 1 S/N1 - 60 - dB Signal to Noise Ratio 2 S/N2 - 60 - dB Signal to Noise Ratio 3 S/N3 - 30 - dB -3dB limiting Sensitivity VIn(lim) IF input - 22 - dBuVEMF IF input, AM=30% Vi=60dBuVEMF - 50 - dB - 2 - 0.9 - V - 60 - mVrms AM Rejection Raito AMR IF Amplifier Input Resistance RinIF RSSI Output Voltage Vrssi Demodulated Output Level Vod -2- Mixer input Vin=60dBuVEMF Mixer input Vin=60dBuVEMF Mixer input Vin=25dBuVEMF IF input Vi=40dBuVEMF IF input Vi=60dBuVEMF kΩ Ver.2003-05-15 NJM2592 Oscillator Circuit Crystal and LC resonant Element CARRIER FSK RSSI SENCE OUT V+ BPF V CHARGE Switch + LNA RF 20 IN 19 18 17 16 15 14 13 12 11 MIXER RSSI COMP FSK COMP BUFFER RSSI OSC 1 FILTER AMP CHARGE QUAD DET IFAMP IF AMP 2 3 4 5 V + OverTone X'tal 6 7 CDEC 8 9 10 + CREF DET TANK V+ IF Filter PLL Frequency Synthesizer IC MIXER BUFFER OSC 1 2 3 4 5 V PLL Synthesizer Ver.2003-05-15 + [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. -3-