NJM2592

NJM2592 470MHz INPUT MIXER AND 455kHz FM IF DEMODULATOR IC GENERAL DESCRIPTION The NJM2592 is a wide-operating voltage, low-current FM IF demodulator IC with 455kHz(standard) IF frequency. It includes an oscillator, mixer, limiting amplifier, quadrature detector, active filter, and FSK comparator. The NJM2592 also has a RSSI circuit and RSSI comparator for carrier sense. NJM2592V PACKAGE OUTLINE FEATURES Wide Operating Voltage 1.8V to 9.0V Low Operating Current 2.2mA type. at V+ =2.0V, external local oscillator input Maximum Mixer Input Signal Frequency 470MHz (reference value) Level 0dBm Mixer Input Resistance 50Ω IF Frequency 455kHz (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 OUT VREF1 VREF2 Ver.2004-08-25 -1- NJM2592 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power Dissipation Mixer Input Signal Level Operating Temperature Storage Temperature SYMBOL V+ Pd VmixMAX Topr Tstg RATINGS 10.0 300 0 - 40 to +85 - 40 to +125 (Ta=25°C) UNIT V mW dBm °C °C (Ta=25°C) MIN. 1.8 TYP. 2.5 MAX. 9.0 UNIT V RECOMMENDED OPERATING CONDITION PARAMETER Supply Voltage SYMBOL V+ TEST CONDITIONS ELECTRICAL CHARACTERISTICS (Ta=25°C, V+=2.0V, fmix=430MHz, flo=429.545MHz, fif=455kHz, fmod=600Hz, fdev=±4kHz, unless otherwise noted) PARAMETER Current Consumption Mixer Conversion Gain Mixer 3 rd Order Intercept Mixer Input Resistance Mixer Input Capacitance Mixer Output Resistance Signal to Noise Ratio 1 Signal to Noise Ratio 2 Signal to Noise Ratio 3 -3dB Limiting Sensitivity AM Rejection Ratio IF Amplifier Input Resistance RSSI Output Voltage SYMBOL Iccq Gmix IP3 R in M Cin M R oM S/N1 S/N2 S/N3 Vin(lim) AMR RinIF Vrssi IF input VinIF=40dBuVEMF Mixer input VinMIX=60dBuVEMF IF input VinIF=60dBuVEMF IF input VinIF=25dBuVEMF IF input IF input, AM=30% VinIF=60dBuVEMF TEST CONDITIONS No signal VinMIX=60dBuVEMF, Measured at Pin3, without IF filter, terminated with 2kΩ MIN. 1.8 16 (0.3) TYP. 2.2 20 95 (50) (2.0) 2.0 60 60 30 22 50 2.0 0.45 MAX. 2.8 24 (0.65) UNIT mA dB dBuV Ω pF kΩ dB dB dB dBuVEMF dB kΩ V The values shown in parenthesis are reference values. -2- Ver.2004-08-25 NJM2592 PARAMETER Demodulated Output Level Duty Ratio of Wave Shaped Output Quick Charge/Discharge Current High Level Leak Current of CARRIER SENSE Terminal Low Level Voltage of CARRIER SENSE Terminal Bias Current of SENSE LEVEL Terminal High Level Leak Current of FSK OUT Terminal Low Level Voltage of FSK OUT Terminal SYMBOL V od DR Ich IcryH VcryL I level IfskH VfskL TEST CONDITIONS IF input VinIF =60dBuVEMF IF Input VinIF=60dBuVEMF FSK REF=GND LPFOUT=0.4V VCARRIER SENSE=V+ ICARRIER SENSE=100uA VCARRIER SENSE=0.8V VFSK OUT=V+ IFSK OUT=100uA MIN. 75 40 35 TYP. 85 50 65 (0.0) 0.1 (0.0) (0.0) 0.1 MAX. 95 60 110 0.4 0.4 UNIT mVrms % uA uA V uA uA dB The values shown in parenthesis are reference values. Ver.2004-08-25 -3- NJM2592 TEST CIRCUIT This test circuit allows the measurement of all parameters described in “ELECTRICAL CHARACTERISTICS”. This test circuit includes some electrical switches that should be in the suitable position for the measurement of each parameter. Circuit diagram RSSI CARRIER FSK OUT SENSE OUT CHARGE SWITCH V+ Hi Lo 10u 1000p 430MHz V+ V+ 100k 1000p 68k 0.01u 68k 560p 68k 3300p 100k 20 19 18 17 + - 16 15 + 14 13 + - 12 11 MIXER RSSI COMP FSK COMP BUFFER FILTER AMP RSSI + IF AMP CHARGE QUAD DET OSC 1 2 1000p 51 429.545MHz 3 1000p 4 10u 5 V+ 0.1u 6 0.1u 7 8 9 22p (2) 10 V + + 10u 3.3k CD 10u B A IF FILTER IF SW 51 455kHz CD : Ceramic discriminator, CDBCB455KCAY66 (Murata Manufacturing Co., Ltd, Japan) IF FILTER : Ceramic filter, CFWB455KEFA004 (Murata Manufacturing Co., Ltd., Japan) Measurement condition “Condition1” is the condition for the case of IF input : IF SW : in the A position. IF IN input signal : input frequency(fif) = 455kHz, input level(VinIF)= 60dBuVEMF, modulation frequency(fmod)=600Hz, deviation fdev=±4kHz “Condition 2” is the condition for the case of Mixer Input : IF SW : in the B position MIX IN input signal: input frequency(fmix)=430MHz, input level(VinMIX)=60dBuVEMF, modulation frequency(fmod)=600Hz, deviation fdev=±4kHz OSC(E)input signal: input frequency(fosc)=429.545MHz, input level(VinOSC)=105dBuVEMF CERAMIC DISCRIMINATOR (especially designed for NJM2592) To optimize some important performance, the following ceramic discriminator CD is available. For more information on this CD and 450kHz CD, please contact the CD supplier. CDBCB455KCAY71 (Murata Manufacturing Co., Ltd., Japan) with the external capacitance of 33pF located between pin 9 and pin10. -4- Ver.2004-08-25 NJM2592 TERMINAL FUNCTION (Ta=25°C, V+=2.0V) Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION Base / Emitter Terminal Colpitts - type oscillator is formed with an external oscillator element of crystal unit or SAW resonator. Output of an external oscillator circuit can also input to pin1 or pin2. 1 OSC (B) 1 2 V+ - 20p - 2 OSC (E) V+ Mixer Output An external 455kHz ceramic filter is connected. The typical output impedance is 2kΩ. 1.1V 3 MIX OUT 3 1.4k 4 V+ - Supply Voltage IF Limiter Amplifier Input This is an input to the IF amplifier after passing through 455kHz ceramic filter. The typical input impedance is 2kΩ. IF Decoupling An external decoupling capacitor is connected to enhance stability. V+ 5 IF IN 50k 1k 5 6 1.94V 1k 6 DEC 1.94V V+ 7 FSK VREF1 7 0.55V FSK Reference Input This pin is an input of reference voltage for FSK comparator. An external capacitor is connected to create an average DC level of FM demodulated signal. The choice of this capacitor is dependent on the speed of data signal. A quick charge/discharge circuit offers the voltage of pin 7 comes the same voltage of pin 11 quickly. Ver.2004-08-25 -5- NJM2592 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION FSK Reference Voltage Output This pin usually keeps open. This fixed output voltage may be available for the FSK reference voltage of wave shaping comparator by connecting to pin7. This usage is effective in shaping the data signal with continuous bits of the same polarity, and discussed in another document related to applications information. V+ 8 FSK VREF2 8 0.55V 40k V+ IF Output An external phase - shifting capacitor is connected between pin9 and pin10. 1.19V 9 IF OUT 9 40uA 10 400 V+ 400 1.99V Quadrature Detector Input An external phase - shifting coil or ceramic discriminator is connected. 10 QUAD IN V+ FM Demodulated Signal Output An external 3rd order multiple feed - back filter (RC filter) is connected between pin11 and pin13. 0.55V 11 AF OUT 11 1k 40uA -6- Ver.2004-08-25 NJM2592 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION Low Pass Filter Input An external RC components forms a band pass filter between pin12 and pin13. This terminal is biased from pin 11 though an external RC filter. Low Pass Filter Output 0.55V V+ 12 LPF IN 12 13 0.55V 13 LPF OUT V+ 14 CHARGE SW 14 300k -- Quick Charge / Discharge Control The power supply output voltage to pin 14 sets up the quick charge / discharge circuit. Hi : ON Low : OFF Instead of V+, another power source can also be used within the limit of the rated supply voltage. V+ 15 15 FSK OUT -- FSK Output The FSK comparator is a wave shaping circuit. A Filter Amplifier output signal is inverted and wave shaped. Instead of V+, another power source can also be used within the limit of the rated supply voltage. V+ 16 Carrier Sense Output This pin outputs the result of RSSI comparator by comparing RSSI output level with an external input level to pin 18. -- 16 CARRIER SENSE Ver.2004-08-25 -7- NJM2592 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION Received Signal Strength Indicator Output Pin 11 outputs DC level proportional to the log of input signal level to pin 20. 0.05V 17 V+ 17 RSSI OUT 50k V+ Sense Level Input External reference voltage of RSSI comparator 18 SENSE LEVEL 18 -- Ground 19 GND -Mixer Input The mixer is designed to work up to 470MHz with the typical input impedance of RinM = 50Ω and CinM = 2pF(at 430MHz). 0.27V 20 V+ 20 MIX IN 500 Note : 1. ESD protection diodes exist between each of the following pins and V+. Pin 1,2,3,5,6,7,8,9,10,11,12,13,17,18,20 2. ESD protection diodes also exist between each of the following pins and ground. Pin 1,2,3,5,6,7,8,9,10,11,12,13,14,15,16,17,18 -8- Ver.2004-08-25 NJM2592 APPLICATION CIRCUIT External Local Oscillator Signal Input RSSI CARRIER FSK OUT SENSE OUT CHARGE SWITCH Hi Lo V + V + BPF LNA 20 19 18 17 + 16 15 + 14 13 12 11 Input Imp.50ohm MIXER + FILTER AMP RSSI COMP FSK COMP BUFFER RSSI + IF AMP CHARGE QUAD DET OSC 1 2 3 4 5 V+ 6 CDEC 7 + 8 CREF 9 10 DET TANK External Oscillator IF FILTER V+ Local Oscillator with External Crystal and LC Resonant Elements RSSI CARRIER FSK OUT SENSE OUT CHARGE SWITCH Hi Lo V+ V + 20 19 18 17 + - 16 15 + 14 13 12 11 Input Imp.50ohm MIXER + FILTER AMP RSSI COMP FSK COMP BUFFER RSSI + IF AMP CHARGE QUAD DET OSC V+ 1 2 3 4 5 V+ 6 CDEC 7 + 8 CREF 9 10 Overtone Crystal Unit IF Filter DET Tank V+ Ver.2004-08-25 -9- NJM2592 EVALUATION PC BOARD The evaluation board is useful for your design and to have more understanding of the usage and performance of this device. This circuit is the same as TEST CIRCUIT. Note that this board is not prepared to show the recommendation of pattern and parts layout. Circuit Diagram SENSE RSSI CARRIER FSK CHARGE AF LEVEL OUT SENSE OUT SW OUT Hi Lo V+ R6 100k C10 1000p C9 1000 R5 100k C6 0.01 C7 560p R4 68k R2 68k R3 68k C8 3300p RF IN 20 19 18 17 + - 16 15 + 14 13 12 11 MIXER + FILTER AMP RSSI COMP FSK COMP BUFFER RSSI + IF AMP CHARGE QUAD DET OSC 1 LO IN 2 3 C3 4 1000p C13 10u 5 V + 6 C4 0.1u C2 0.1u 7 + 8 C12 NC 10u 9 C5 33p 10 V + C1 NC 1000p R8 51 CD R9 51 B A IF IN R1 3.3k IF FILTER C2 Position Note: 1. This board is designed for mixer-input type and C2 is factory-configured as follows: C2 : in the B position For the case of IF-input type, the position of C2 is necessary to change as follows: C2 : in the A position The actual position of C2 is shown in the next page. 2. External components CF=CFWLB455KEFA004-B0 (Murata manufacturing Co., Ltd.) CD=CDBCB455KCAY71-B0 (Murata manufacturing Co., Ltd.) - 10 - Ver.2004-08-25 NJM2592 Circuit Side View Position of C2 for the case of IF-input Local IN RF IN R8 C1 C10 SENSE LEVEL C2 R10 CF C4 IC1 NJM2592 R7 C6 CF C9 C5 IF IN C8 R3 R6 C12 CD R1 R4 R9 C7 R2 RSSI SW CARRIER SENSE R5 V+ C11 SW FSK OUT Vcc : Charge ON GND: Charge OFF AF OUT Ground Side View Note: 1. External Components C1, C3, C9,C10=1000pF C2,C4=0.1uF C5=33pF C6=0.01uF C7=560p C11=0.47uF C12,C13=10uF R1=3.3kΩ R2,R3,R4=68kΩ R5,R6=100kΩ R7,R10=0Ω R8,R9=51Ω CF=CFWLB455KEFA004-B0 CD=CDBCB455KCAY71-B0 C8=3300pF Ver.2004-08-25 - 11 - NJM2592 TYPICAL CHARACTERISTICS ( Ta=25°C, V+=2.0V, unless otherwise noted ) Current Consumption versus Supply Voltage 3.0 2.5 Current Consumption Iccq(mA) No input signal Mixer Conversion Gain versus Supply Voltage 30 Mixer Conversion Gain Gmix(dB) Measured at Pin3, terminated with 2kΩ 25 Fmix=400MHz 2.0 1.5 1.0 0.5 0.0 0 2 4 6 Supply Voltage V+(V) 8 10 20 Fmix=100MHz 15 10 5 0 0 2 4 6 Supply Voltage V+(V) 8 10 Demodulated Output versus Supply Voltage 120 Demodulated Output Level Vod(mVrms) Condition 1(IF input) FSK Duty Ratio versus Supply Voltage 60 Duty Ratio of Wave Shaped Output (%) Condition 1(IF input) 100 80 60 40 20 0 0 2 4 6 Supply Voltage V+(V) 8 10 55 CHARGE SW=OFF 50 CHARGE SW=ON 45 40 0 2 4 6 Supply Voltage V+(V) 8 10 S/N versus Supply Voltage-Mixer Input100 Signal to Noise Ratio S/N1(dB) Condition 2(Mixer input) -3dB Limiting Sensitivity versus Supply Voltage 30 Limiting Sensitivity Vin(lim) (dBuVEMF) Condition 1(IF input) 80 25 20 15 10 5 0 60 40 20 0 0 2 4 6 Supply Voltage V+(V) 8 10 0 2 4 6 Supply Voltage V+(V) 8 10 - 12 - Ver.2004-08-25 NJM2592 Mixer Conversion Gain versus Frequency 30 Measured at Pin3, terminated with 2kΩ M ixer Input Level Characteristics 120 Mixer Output Level 6.0 5.0 4.0 3.0 2.0 Current Consumption Mixer Conversion Gain Gmix(dB) Mixer Output Level (dBuV) 25 20 15 10 5 0 10 100 Mixer Input Frequncy fmix(MHz) 1000 100 80 60 40 20 0 -100 -80 -60 -40 -20 0 20 Mixer Input Level VinMIX(dBm) 1.0 0.0 Mixer Conversion Gain versus OSC Input 30 Measured at Pin3, terminated with 2kΩ AF Output versus Frequency:S-Curve 800 Condition 1(IF input) Mixer Conversion Gain Gmix(dB) 25 fmix=400MHz AF Output Voltage (mV) 20 fmix=100MHz 600 15 10 5 0 70 80 90 100 110 Local OSC Input Level (dBuVEMF) 120 400 200 440 445 450 455 460 IF Frequency fif(kHz) 465 470 IF Detuning Characteristics 5 0 -5 Condition 1(IF input) Carrier Sense Characteristics 2.2 2 RSSI Comparator Output Voltage (V) Conditon 1(IF input), SENSE LEVEL=0.8V 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 IF Detuning (dB) -10 -15 -20 -25 -30 -15 -10 -5 0 5 10 Relative Frequency to fif (kHz) 15 0 0.4 0.8 1.2 1.6 RSSI Output Voltage Vrssi(V) Ver.2004-08-25 Current Consumption Iccq(mA) 2 - 13 - NJM2592 S+N,N,AMR versus Mixer Input 10 0 -10 S+N,N,AMR(dB) S+N,N,AMR(dB) Condition 2(Mixer input), AM=30% S+N S+N,N,AMR versus IF Input 10 0 -10 -20 -30 -40 -50 -60 N AMR Condition 1(IF input), AM=30% S+N -20 -30 -40 -50 -60 -70 -80 -20 0 20 40 60 80 100 Mixer Input Level VinMIX(dBuVEMF) 120 AMR -70 -80 -20 0 N 20 40 60 80 100 IF Input Level VinIF(dBuVEMF) 120 RSSI Output versus Mixer Input 2.4 2.0 1.6 1.2 0.8 0.4 0.0 -20 0 20 40 60 80 100 Mixer Input Level VinMIX(dBuVEMF) 120 Condition 2(Mixer input) RSSI Output versus IF Input 2.4 Condition 1(IF input) RSSI Output Voltage Vrssi(V) V+=9.0V RSSI Output Level Vrssi(V) 2.0 1.6 1.2 0.8 0.4 0.0 -20 0 V+=9.0V V+=4.0V V+=2.0V V+=4.0V V+=2.0V 20 40 60 80 100 IF Input Level VinIF(dBuVEMF) 120 Quick Charge/Discharge Current versus FSK Reference Input Voltage Quick Charge/Discharge Current Ich(uA) 80 60 40 20 0 -20 -40 -60 -80 0 200 400 600 800 1000 FSK Reference Input Voltage(mV) Condition1 (IF input),LPF OUT=0.45V - 14 - Ver.2004-08-25 NJM2592 Current Consumption versus Temperature 2.5 2.4 Current Consumption Iccq(mA) No input signal Mixer Conversion Gain versus Temperature 30 Measured at Pin3, terminated with 2kΩ Mixer Conversion Gain Gmix(dB) 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 -40 -20 0 20 40 60 80 100 Ambient Temperature Ta(°C) 25 20 fmix=400MHz fmix=100MHz 15 10 5 0 -40 -20 0 20 40 60 Ambient Temperature Ta(°C) 80 100 Demodulated Output versus Temperature 120 Demodulated Output Level Vod(mVrms) 110 100 90 80 70 60 50 40 -40 -20 0 20 40 60 80 100 Ambient Temperature Ta(°C) Condition 1(IF input) FSK Duty Ratio versus Temperature 60 Condition 1(IF input) 55 Duty Ratio DR(%) 50 45 40 -40 -20 0 20 40 60 80 100 Ambient Temperature Ta(°C) S/N versus Temperature 70 Limiting Sensitivity Vin(lim) (dBuVEMF) -3dB Limiting Sensitivity versus Temperature 30 Condition 1(IF input) Signal to Noise Ratio S/N1,S/N2(dB) 25 Condition 1(IF input) 65 Condition 2(MIX input) 20 15 Condition 2(MIX input) 60 10 5 0 55 50 -40 -20 0 20 40 60 80 100 Ambient Temperature Ta(°C) -40 -20 0 20 40 60 80 100 Ambient Temperature Ta(°C) Ver.2004-08-25 - 15 - NJM2592 RSSI Output versus Temperature-Mixer2.4 2.0 70dBuVEMF Condition 2(Mixer input) RSSI Output versus Temperature-IF2.4 2.0 1.6 1.2 0.8 0.4 30dBuVEMF 20dBuVEMF Condition 1(IF input) RSSI Output Voltage Vrssi(V) 1.6 1.2 0.8 0.4 0.0 -40 -20 60dBuVEMF RSSI Output Voltage Vrssi(V) 50dBuVEMF 40dBuVEMF 30dBuVEMF 20dBuVEMF 70dBuVEMF 60dBuVEMF 50dBuVEMF 40dBuVEMF 0.0 0 20 40 60 80 Ambient Temperature Ta(°C) 100 -40 -20 0 20 40 60 80 Ambient Temperature Ta(°C) 100 Quick Charge/Discharge Current versus Temperature Condition 1(IF input),LPF OUT=0.45V -20 -30 Quick Charge/Discharge Current Ich(uA) -40 -50 -60 -70 -80 -90 -100 -40 -20 0 20 40 60 80 100 Ambient Temperature Ta(°C) [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. - 16 - Ver.2004-08-25