NJM2593

NJM2593 www.DataSheet4U.com 50MHz INPUT MIXER AND 450kHz FM IF DEMODULATOR IC GENERAL DESCRIPTION The NJM2593 is a wide-operating voltage, low-current FM IF demodulator IC with 450kHz(standard) IF frequency. 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 PACKAGE OUTLINE 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 4.5kΩ (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 MIX IN 20 SENSE RSSI CARRIER FSK CHARGE LPF SW OUT GND LEVEL OUT SENSE OUT 19 18 17 + 16 15 + 14 13 + FILTER AMP LPF IN 12 AF OUT 11 MIXER RSSI COMP FSK COMP BUFFER RSSI + IF AMP CHARGE QUAD DET OSC 1 OSC (B) 2 OSC (E) 3 MIX OUT 4 V+ 5 IF IN 6 DEC 7 8 9 10 QUAD IN IF FSK FSK VREF1 VREF2 OUT Ver.2004-08-25 -1- NJM2593 www.DataSheet4U.com ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power Dissipation Operating Temperature Storage Temperature SYMBOL V+ Pd Topr Tstg RATINGS 10.0 300 - 40 to +85 - 40 to +125 (Ta=25°C...