NJM2593 50MHz INPUT MIXER AND 450kHz FM IF DEMODULATOR IC GENERAL DESCRIPTION PACKAGE OUTLINE The NJM2593 is an FM IF demodulator IC with 450kHz (standard) IF frequency, which operates from 1.8V to 9V supply, low-current. It includes an oscillator, mixer, limiting amplifier, quadrature detector, active filter, and FSK comparator. The NJM2593 also has a RSSI circuit and RSSI comparator for carrier sense. NJM2593V FEATURES Wide Operating Voltage 1.8V to 9.0V + Low Operating Current 1.2mA type. at V =2.0V, external local oscillator input Maximum Mixer Input Signal Frequency 50MHz (reference value) Mixer Input Resistance 4.5k (reference value) IF Frequency 450kHz (standard) Conventional Quadrature Detector External Phase-shifting Capacitor External Discriminator or LC Resonant Circuit RSSI Comparator with Open-Collector Output Quick Charge/Discharge Circuit for FSK Reference Voltage Bipolar Technology Package Outline SSOP20 BLOCK DIAGRAM SENSE RSSI FSK LPF AF MIX CARRIER CHARGE LPF LEVEL OUT SENSE OUT SW OUT OUT IN IN GND 20 19 18 17 16 15 14 13 12 11 - + + MIXER - + - RSSI COMP FSK COMP FILTER AMP BUFFER RSSI CHARGE QUAD DET + OSC - IF AMP 1 2 3 4 5 6 7 8 9 10 MIX V+ OSC OSC IF DEC FSK IF QUAD FSK OUT (B) (E) IN VREF2 OUT IN VREF1 Ver.2018-03-09 - 1 - NJM2593 ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL RATINGS UNIT + Supply Voltage V 10.0 V Power Dissipation P d 300 mW Operating Temperature T o p r - 40 to +85 C Storage Temperature T s t g - 40 to +125 C RECOMMENDED OPERATING CONDITION (Ta=25C) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT + Supply Voltage V 1.8 2.0 9.0 V ELECTRICAL CHARACTERISTICS + (Ta=25C, V =2.0V, fmix=21.7MHz, flo=21.25MHz, fif=450kHz, fmod=600Hz, fdev=2kHz, unless otherwise noted) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT Current Consumption I c c q No signal - 1.2 1.5 mA VinMIX=60dBuVEMF, Mixer Conversion Gain G m i x Measured at Pin3, without IF 17 20 23 dB filter, with 1.8k+0.1uF Mixer 3rd Order Intercept IP3 - 95 - dBuV Mixer Input Resistance R i n M - 4.5 - k Mixer Input Capacitance C i n M - 2.0 - pF Mixer Output Resistance R o M - 1.8 - k Mixer input Signal to Noise Ratio 1 S / N 1 - 60 - dB VinMIX=60dBuVEMF IF input Signal to Noise Ratio 2 S / N 2 40 60 70 dB VinIF=60dBuVEMF IF input Signal to Noise Ratio 3 S / N 3 20 30 40 dB VinIF=25dBuVEMF -3dB Limiting Sensitivity V i n ( l i m ) IF input - 22 - dBuVEMF IF input, AM=30% AM Rejection Ratio A M R - 50 - dB VinIF=60dBuVEMF IF Amplifier Input Resistance R i n I F - 1.8 - k IF input RSSI Output Voltage V r s s i 0.35 0.5 0.65 V VinIF=40dBuVEMF Ver.2018-03-09 - 2 -