NJM2590/97 455kHz INPUT FM IF DEMODULATOR GENERAL DESCRIPTION PACKAGE OUTLINE The NJM2590 and NJM2597 are low current FM IF demodulator ICs with 455kHz IF input, which operate from 1.6V supply. The NJM2590/97 contain the minimum functions required to FM IF demodulator, that is, IF amplifier, quadrature detector, LPF amplifier, FSK comparator, RSSI, and RSSI comparator. It offers unmatched design flexibility. NJM2590V/97V FEATURES Low Operating Voltage 1.6V to 5.5V + Low Operating Current 550uA at V =1.8V IF Input Frequency 455kHz (standard) RSSI Comparator The Range of Linear Area on RSSI Output versus IF Input Characteristics NJN2590 IF Input level=25 to 60 dBuVEMF (reference value) NJM2597 IF Input level=35 to 85 dBuVEMF (reference value) Bipolar Technology Package Outline SSOP14 BLOCK DIAGRAM + CARRIER CHARGE LPF V SENSE RSSI FSK OUT SENSE LEVEL OUT OUT 14 13 12 11 10 9 8 RSSI FSK COMP COMP CHARGE RSSI IF AMP QUAD DET LPF 1 2 3 4 5 6 7 GND DEC IF IN FSK QUAD AF LPF REF IN OUT IN Ver.2018-03-09 - 1 - NJM2590/97 ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL RATINGS UNIT + Supply Voltage V 8.0 V Power Dissipation P 300 mW D Operating Temperature T o p r - 40 to +85 C Storage Temperature T s t g - 40 to +125 C RECOMMENDED OPERATIONAL CONDITION (Ta=25C) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT + Supply Voltage V 1.6 1.8 5.5 V + ELECTRICAL CHARACTERISTICS (Ta=25C, V =1.8V, fin=455kHz, fmod=600Hz, fdev=4kHz) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT Current Consumption I c c q No Signal 440 550 660 uA IF Amplifier Input Resistance R i n (1.6) 2 (2.4) k Signal to Noise Ratio 1 S / N 1 Vi=60dBu EMF - 60 - dB Signal to Noise Ratio 2 S / N 2 Vi=25dBu EMF - 30 - dB - 3dB Limiting Sensitivity V i n ( l i m ) - 22 27 dBu EMF Demodulated Output Level V o d Vi=60dBu EMF 35 40 65 mVrms Vi=60dBu EMF AM Rejection Raito A M R - 50 - dB AM=30% Duty Ratio of Wave Shaped Output D R Vi=60dBu EMF 40 50 60 % V =GND FSK OUT Quick Charge/Discharge Current I c h 35 65 110 uA V = 0.18V LPF OUT NJM2590 Vi=40dBu EMF 0.7 0.9 1.1 RSSI Output Voltage V r s s i V NJM2597 Vi=80dBu EMF 0.8 1.1 1.4 High Level Leak Current of + I f s k H V =V (-0.1) (0) (0.1) uA FSK OUT FSK OUT Terminal Low Level Voltage of V f s k L I =100uA - 0.1 0.4 V FSK OUT FSK OUT Terminal High Level Leak Current of + I c r y H V =V (-0.1) (0) (0.1) uA CARRIAR SENSE CARRIER SENSE Terminal Low Level Voltage of V c r y L I =100uA 0.0 0.1 0.4 V CARRIER SENSE CARRIER SENSE Terminal Bias Current of I l e v e l V =0.8V (-1.0) (0) (1.0) uA CARRIER SENSE SENSE LEVEL Terminal The value shown in parenthesis are reference values. Ver.2018-03-09 - 2 -