NJM2597

NJM2590/97 www.DataSheet4U.com 455kHz INPUT FM IF DEMODULATOR GENERAL DESCRIPTION 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 PACKAGE OUTLINE 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 V + CARRIER SENSE RSSI SENSE LEVEL OUT 13 12 11 FSK CHARGE OUT 10 9 LPF OUT 8 14 RSSI COMP RSSI IF AMP FSK COMP CHARGE QUAD DET LPF 1 IF IN 2 GND 3 DEC 4 FSK REF 5 QUAD IN 6 AF OUT 7 LPF IN Ver.2004-08-25 -1- NJM2590/97 www.DataSheet4U.com ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power Dissipation Operating Temperature Storage Temperature SYMBOL V+ PD Topr Tstg RATINGS 8.0 300 - 40 to +85 - 40 to +125 (Ta=25°C) UNIT V mW °C °C RECOMMENDED OPERATIONAL CONDITION PARAMETER Supply Voltage SYMBOL V+ TEST CONDITIONS MIN. 1.6 TYP. 1.8 MAX. 5.5 (Ta=25°C) UNIT V ELECTRICAL CHARACTERISTICS (Ta=25°C, V+=1.8V, fin=455kHz, fmod=600Hz, fdev=±4k...