NJM2295AV

NJM2295A FM IF IC FOR REMOTE KEYLESS ENTRY SYSTEM ■ GENERAL DESCRIPTION The NJM2295A is FM IF IC for the remote keyless entry system (RKE). It includes almost all functions of IF blocks, from the 1st. Mixer to the wave shaving circuit. Exclusively designed NJM2295A is suited not only for the RKE, but for other FM signal receivers. ■ PACKAGE OUTLINE NJM2295AV ■ FEATURES ● Low Operating Current ● Low Operating Voltage ● Local Oscillation Frequency ● Mixer Active Frequency ● IF Frequency ● 1st. Mixer Included ● RSSI Circuit Included ● FSK Wave Shaping Circuit ● Bipolar Technology ● Package Outline 5mA typ. at V+=5V +2.7V to 7.0V 50 to 350MHz to 450MHz IF=10.7MHz SSOP20 ■ BLOCK DIAGRAM Ver.2003-12-09 -1- NJM2295A ■ ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL V + (Ta=25°C) RATINGS 9.0 300 -40 to +85 -40 to +125 UNIT V mW °C °C PD Topr Tstg ■ ELECTRICAL CHARACTERS PARAMETER Supply Voltage No signal Operating Current Battery saving Operating Current Mixer Gain 1 Mixer Gain 2 Mixer Sept Point Mixer Input Resistance Mixer Input Capacity Mixer Output Resistance If amplifier Input Resistance Signal to Noise Ratio 1 Signal to Noise Ratio 2 Signal to Noise Ratio 3 -3dB limiting sensitivity Demodulated Output Level AM Rejection Ratio Duty ratio of Wave Shaped Output RSSI Output Voltage 1 RSSI Output Voltage 2 RSSI Output Voltage 3 RSSI Output Resistance Quick Charge / discharge current Low Level Output Voltage of FSK-OUT High Level Leak Current of FSK-OUT Terminal SYMBOL V + (V+=5.0V, Ta=25°C, fmod=1kHz, fmix=320MHz, fIF=10.7MHz, fdev=±10kHz) TEST CONDITION MIN. 2.7 RL=No Connect. 320MHz Gain - 450MHz Gain 13.5 f=320MHz f=320kHz Mixer Input, VIN=80dBµVEMF IF input, VIN=80dBµVEMF IF input, VIN=35dBµVEMF Mixer Input IF input, VIN=60dBµVEMF IF input, VIN=80dBµVEMF, AM=30% IF input, VIN=60dBµVEMF IF input, VIN=20dBµVEMF IF input, VIN=60dBµVEMF IF input, VIN=100dBµVEMF 80 40 0.35 0.7 1.30 35 IL=100µA TYP. 5.0 18.5 1 103 1 2 330 330 60 60 25 22 150 50 50 0.55 1.00 1.75 48 70 0.1 MAX. 7.0 7.5 10 22.5 3 27 60 0.70 1.3 2.15 120 0.4 2 UNIT V mA µA dB dB dBµVEMF kΩ pF Ω Ω dB dB dB dBµVEMF mVrms dB % V V V kΩ µA V µA ICCq ICCS Gmix1 Gmix2 IP RinM CinM ROM RinIF S / N1 S / N2 S / N3 Slim Vod AMR DR RSSI1 RSSI2 RSSI3 RSSIR Ich VfskL IfskH -2- Ver.2003-12-09 NJM2295A ■ APPLICATION CIRCUIT Ver.2003-12-09 -3- NJM2295A ■ TERMINAL FUNCTION PIN No. SYMBOL FUNCTION EQUIVALENT CIRCUIT 1 OSC IN SAW is oscillation input terminal. 2 OSC OUT Oscillation Output Terminal. 19 MIX IN Mixer input terminal. Input impedance : Parallel resistance : 1kΩ Parallel capacity : 2pF 4 MIX OUT Output terminal for mixer. Output resistance is 330Ω at typical. 6 IF IN Limiter input terminal. Input resistance is 330Ω at typical. 7 DEC Decoupling terminal for bias. -4- Ver.2003-12-09 NJM2295A ■ TERMINAL FUNCTION PIN No. SYMBOL FUNCTION EQUIVALENT CIRCUIT 9 LIM OUT Output terminal for limiter amplifier. Typical input impedance is 300 ohms. 10 QUAD IN Input terminal of a quadrature detection circuit. Connect with a ceramic discriminator. 14 RSSI OUT RSSI output terminal. 11 AF OUT Demodulated siganl output. 12 LPF IN Input terminal of a low pass filter. This terminal is biased from the AF-OUT terminal (11pin) through an external RC filter. Ver.2003-12-09 -5- NJM2295A ■ TERMINAL FUNCTION PIN No. SYMBOL FUNCTION EQUIVALENT CIRCUIT 13 LPF OUT Output terminal of a low pass filter. 8 FSK REF Reference input terminal of a wave shaping comparator. Connected with an external capacitor. 17 FSK OUT Output terminal of a wave shaping circuit. The Wave shaped signal inverted for the LPF output comes out. 15 BS Control terminal of a battery saving circuit. H : This circuit is ON. L : This circuit is OFF. 16 CHARGE Control terminal of a quick charge / discharge circuit. H : This circuit is ON. L : This circuit is OFF. 5 3 20 18 V1 GND1 V2 GND2 + + On and ;after IF supply voltage. On and after IF ground. Supply voltage for mixer and OSC. Ground for mixer and OSC - [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. -6- Ver.2003-12-09