NJM2592 470MHz INPUT MIXER AND 455kHz FM IF DEMODULATOR IC GENERAL DESCRIPTION PACKAGE OUTLINE 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 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 SENSE RSSI CARRIER FSK CHARGE LPF SW OUT GND LEVEL OUT SENSE OUT 20 19 18 17 16 15 14 12 11 + - RSSI COMP FSK COMP BUFFER AF OUT 13 + + - MIXER LPF IN RSSI FILTER AMP CHARGE QUAD DET + - OSC IF AMP Ver.2004-08-25 1 2 3 4 5 6 OSC (B) OSC (E) MIX OUT V+ IF IN DEC 7 8 9 IF FSK FSK OUT VREF1 VREF2 10 QUAD IN -1- NJM2592 ABSOLUTE MAXIMUM RATINGS PARAMETER (Ta=25°C) SYMBOL RATINGS UNIT Supply Voltage V+ 10.0 V Power Dissipation Pd 300 mW Mixer Input Signal Level VmixMAX 0 dBm Operating Temperature Topr - 40 to +85 °C Storage Temperature Tstg - 40 to +125 °C RECOMMENDED OPERATING CONDITION PARAMETER Supply Voltage SYMBOL TEST CONDITIONS V+ (Ta=25°C) MIN. TYP. MAX. UNIT 1.8 2.5 9.0 V ELECTRICAL CHARACTERISTICS (Ta=25°C, V+=2.0V, fmix=430MHz, flo=429.545MHz, fif=455kHz, fmod=600Hz, fdev=±4kHz, unless otherwise noted) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT Current Consumption Iccq No signal 1.8 2.2 2.8 mA Mixer Conversion Gain Gmix VinMIX=60dBuVEMF, Measured at Pin3, without IF filter, terminated with 2kΩ 16 20 24 dB IP3 - 95 - dBuV Mixer Input Resistance R in M - (50) - Ω Mixer Input Capacitance Cin M - (2.0) - pF Mixer Output Resistance R oM - 2.0 - kΩ Signal to Noise Ratio 1 S/N1 - 60 - dB Signal to Noise Ratio 2 S/N2 - 60 - dB Signal to Noise Ratio 3 S/N3 - 30 - dB -3dB Limiting Sensitivity Vin(lim) IF input - 22 - dBuVEMF IF input, AM=30% VinIF=60dBuVEMF - 50 - dB - 2.0 - kΩ (0.3) 0.45 (0.65) V Mixer 3 rd Order Intercept AM Rejection Ratio AMR IF Amplifier Input Resistance RinIF RSSI Output Voltage Vrssi Mixer input VinMIX=60dBuVEMF IF input VinIF=60dBuVEMF IF input VinIF=25dBuVEMF IF input VinIF=40dBuVEMF The values shown in parenthesis are reference values. -2- Ver.2004-08-25 NJM2592 PARAMETER SYMBOL Demodulated Output Level V od Duty Ratio of Wave Shaped Output DR Quick Charge/Discharge Current Ich 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 TEST CONDITIONS IF input VinIF =60dBuVEMF IF Input VinIF=60dBuVEMF FSK REF=GND LPFOUT=0.4V MIN. TYP. MAX. UNIT 75 85 95 mVrms 40 50 60 % 35 65 110 uA IcryH VCARRIER SENSE=V+ - (0.0) - uA VcryL ICARRIER SENSE=100uA - 0.1 0.4 V I level VCARRIER SENSE=0.8V - (0.0) - uA IfskH VFSK OUT=V+ - (0.0) - uA VfskL IFSK OUT=100uA - 0.1 0.4 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 V+ 10u 1000p V+ CHARGE SWITCH V+ 100k 100k 68k Lo Hi 430MHz 20 19 18 17 16 15 14 13 + 11 + - RSSI COMP FSK COMP BUFFER 12 3300p 68k 560p + - MIXER 68k 0.01u 1000p FILTER AMP RSSI CHARGE QUAD DET + - OSC IF AMP 1 2 3 1000p 4 5 6 V+ 1000p 10u 0.1u 7 8 9 10 (2) 22p 0.1u + V + 51 10u CD 3.3k 429.545MHz IF FILTER B A IF SW 51 455kHz 10u 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. 1 SYMBOL EQUIVARENT CIRCUIT V+ OSC (B) 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 20p 2 2 OSC (E) - Mixer Output An external 455kHz ceramic filter is connected. The typical output impedance is 2kΩ. V+ 3 MIX OUT 4 V+ 3 1.4k 1.1V - V+ 5 50k IF IN 1k 1.94V 1k 5 6 6 DEC 1.94V V+ 7 Ver.2004-08-25 FSK VREF1 7 0.55V 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. 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. -5- NJM2592 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE V+ 8 FSK VREF2 0.55V 8 40k IF OUT 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. IF Output An external phase - shifting capacitor is connected between pin9 and pin10. V+ 9 FUNCTION 1.19V 9 40uA 10 10 Quadrature Detector Input An external phase - shifting coil or ceramic discriminator is connected. V+ 400 400 QUAD IN 1.99V FM Demodulated Signal Output An external 3rd order multiple feed - back filter (RC filter) is connected between pin11 and pin13. V+ 11 AF OUT 11 1k 0.55V 40uA -6- Ver.2004-08-25 NJM2592 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE V+ 12 LPF IN 0.55V 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. 12 Low Pass Filter Output 13 13 LPF OUT 0.55V V+ 14 CHARGE SW 14 -- 300k V+ 15 15 FSK OUT -- 16 Ver.2004-08-25 CARRIER SENSE 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. Carrier Sense Output This pin outputs the result of RSSI comparator by comparing RSSI output level with an external input level to pin 18. V+ 16 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. -- -7- NJM2592 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE Received Signal Strength Indicator Output Pin 11 outputs DC level proportional to the log of input signal level to pin 20. V+ 17 RSSI OUT FUNCTION 0.05V 17 50k Sense Level Input External reference voltage of RSSI comparator V+ 18 SENSE LEVEL 19 GND 18 -- Ground -Mixer Input The mixer is designed to work up to 470MHz with the typical input impedance of RinM = 50Ω and CinM = 2pF(at 430MHz). V+ 20 MIX IN 0.27V 20 500 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 V BPF + V CHARGE SWITCH + Lo Hi LNA 20 19 18 17 16 15 14 13 12 11 Input Imp.50ohm + - MIXER + + - RSSI COMP FSK COMP BUFFER FILTER AMP RSSI CHARGE QUAD DET + - OSC IF AMP 1 2 3 4 5 6 V+ 7 8 9 10 + CDEC CREF DET TANK External Oscillator V+ IF FILTER Local Oscillator with External Crystal and LC Resonant Elements RSSI CARRIER FSK OUT SENSE OUT V+ 20 19 18 V 17 CHARGE SWITCH + 16 Lo Hi 15 14 13 12 11 Input Imp.50ohm + - MIXER + + - RSSI COMP FSK COMP BUFFER FILTER AMP RSSI CHARGE QUAD DET + - OSC IF AMP V+ 1 2 3 4 5 V+ 6 7 CDEC 8 9 CREF DET Tank Overtone Crystal Unit 10 + V+ IF Filter 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 R6 100k RF IN V+ C6 R5 100k 0.01 19 18 17 16 15 14 R3 68k 12 C8 3300p 11 FILTER AMP RSSI CHARGE QUAD DET + IF AMP OSC LO IN R2 68k + - RSSI COMP FSK COMP BUFFER 1 13 + + - MIXER R4 68k C7 560p C9 1000 C10 1000p 20 Lo 2 C1 NC 1000p 3 C3 4 5 8 + C12 NC 10u C2 0.1u B IF FILTER 7 C4 0.1u V C13 10u R8 51 6 + 1000p A C2 Position 9 10 C5 33p + V CD R9 51 IF IN R1 3.3k 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 RF IN Local IN R8 C10 Position of C2 for the case of IF-input C1 C9 C6 R9 C5 IF IN R7 C4 C7 CF IC1 NJM2592 CF RSSI R2 R4 R10 C2 SENSE LEVEL C8 R6 R3 CD R1 C12 SW R5 SW C11 V+ CARRIER SENSE AF OUT FSK OUT Vcc : Charge ON GND: Charge OFF 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 Ver.2004-08-25 C8=3300pF - 11 - NJM2592 TYPICAL CHARACTERISTICS ( Ta=25°C, V+=2.0V, unless otherwise noted ) Mixer Conversion Gain versus Supply Voltage Current Consumption versus Supply Voltage No input signal 2.5 Current Consumption Iccq(mA) Measured at Pin3, terminated with 2kΩ 30 Mixer Conversion Gain Gmix(dB) 3.0 2.0 1.5 1.0 0.5 25 Fmix=400MHz 20 Fmix=100MHz 15 10 5 0 0.0 0 2 4 6 Supply Voltage V+(V) 8 0 10 Demodulated Output versus Supply Voltage Duty Ratio of Wave Shaped Output (%) Demodulated Output Level Vod(mVrms) 80 60 40 20 0 55 CHARGE SW=OFF 50 CHARGE SW=ON 45 2 4 6 Supply Voltage V+(V) 8 10 0 2 4 6 Supply Voltage V+(V) 8 10 -3dB Limiting Sensitivity versus Supply Voltage S/N versus Supply Voltage-Mixer InputCondition 2(Mixer input) 30 Limiting Sensitivity Vin(lim) (dBuVEMF) Signal to Noise Ratio S/N1(dB) 10 40 0 80 60 40 20 Condition 1(IF input) 25 20 15 10 5 0 0 0 - 12 - 8 Condition 1(IF input) 60 100 100 4 6 Supply Voltage V+(V) FSK Duty Ratio versus Supply Voltage Condition 1(IF input) 120 2 2 4 6 Supply Voltage V+(V) 8 10 0 2 4 6 Supply Voltage V+(V) 8 10 Ver.2004-08-25 NJM2592 Mixer Input Level Characteristics Mixer Conversion Gain versus Frequency Measured at Pin3, terminated with 2kΩ 30 120 6.0 20 15 10 5 100 5.0 80 4.0 60 3.0 40 2.0 Current Consumption 20 1.0 0 0 10 100 Mixer Input Frequncy fmix(MHz) 0.0 -100 1000 Measured at Pin3, terminated with 2kΩ 800 -40 -20 0 20 Condition 1(IF input) 25 fmix=400MHz 20 fmix=100MHz 15 10 600 400 5 0 200 70 80 90 100 110 Local OSC Input Level (dBuVEMF) 120 440 IF Detuning Characteristics 445 450 455 460 IF Frequency fif(kHz) 465 470 Carrier Sense Characteristics Condition 1(IF input) 5 2.2 Conditon 1(IF input), SENSE LEVEL=0.8V 2 RSSI Comparator Output Voltage (V) 0 -5 IF Detuning (dB) -60 AF Output versus Frequency:S-Curve AF Output Voltage (mV) Mixer Conversion Gain Gmix(dB) -80 Mixer Input Level VinMIX(dBm) Mixer Conversion Gain versus OSC Input 30 Current Consumption Iccq(mA) 25 Mixer Output Level (dBuV) Mixer Conversion Gain Gmix(dB) Mixer Output Level -10 -15 -20 -25 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 -30 0 -15 Ver.2004-08-25 -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) 2 - 13 - NJM2592 S+N,N,AMR versus Mixer Input S+N,N,AMR versus IF Input Condition 2(Mixer input), AM=30% 10 10 Condition 1(IF input), AM=30% S+N 0 0 -10 -10 -20 -20 S+N,N,AMR(dB) S+N,N,AMR(dB) S+N -30 AMR -40 -50 -60 -30 -40 AMR -50 -60 N N -70 -70 -80 -80 -20 0 20 40 60 80 100 Mixer Input Level VinMIX(dBuVEMF) -20 120 RSSI Output versus Mixer Input 20 40 60 80 100 IF Input Level VinIF(dBuVEMF) 120 RSSI Output versus IF Input Condition 2(Mixer input) 2.4 2.0 V+=9.0V 1.6 V+=2.0V V+=4.0V 1.2 0.8 RSSI Output Level Vrssi(V) RSSI Output Voltage Vrssi(V) 2.4 0 Condition 1(IF input) V+=9.0V 2.0 V+=4.0V 1.6 V+=2.0V 1.2 0.8 0.4 0.4 0.0 0.0 -20 0 20 40 60 80 100 Mixer Input Level VinMIX(dBuVEMF) 120 -20 0 20 40 60 80 100 IF Input Level VinIF(dBuVEMF) 120 Quick Charge/Discharge Current Ich(uA) Quick Charge/Discharge Current versus FSK Reference Input Voltage Condition1 (IF input),LPF OUT=0.45V 80 60 40 20 0 -20 -40 -60 -80 0 200 400 600 800 1000 FSK Reference Input Voltage(mV) - 14 - Ver.2004-08-25 NJM2592 Mixer Conversion Gain versus Temperature Current Consumption versus Temperature No input signal 2.5 Mixer Conversion Gain Gmix(dB) Current Consumption Iccq(mA) 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 25 -20 0 20 40 60 80 fmix=400MHz 20 fmix=100MHz 15 10 1.5 -40 Measured at Pin3, terminated with 2kΩ 30 5 0 100 -40 Ambient Temperature Ta(°C) Condition 1(IF input) 100 80 100 110 100 55 Duty Ratio DR(%) Demodulated Output Level Vod(mVrms) 80 Condition 1(IF input) 60 90 80 70 50 45 60 50 40 40 -40 -20 0 20 40 60 80 -40 100 -20 0 20 40 60 Ambient Temperature Ta(°C) Ambient Temperature Ta(°C) S/N versus Temperature -3dB Limiting Sensitivity versus Temperature 70 30 Limiting Sensitivity Vin(lim) (dBuVEMF) Signal to Noise Ratio S/N1,S/N2(dB) 0 20 40 60 Ambient Temperature Ta(°C) FSK Duty Ratio versus Temperature Demodulated Output versus Temperature 120 -20 Condition 1(IF input) 65 Condition 2(MIX input) 60 55 50 25 Condition 1(IF input) 20 15 Condition 2(MIX input) 10 5 0 -40 -20 0 20 40 60 Ambient Temperature Ta(°C) Ver.2004-08-25 80 100 -40 -20 0 20 40 60 80 100 Ambient Temperature Ta(°C) - 15 - NJM2592 RSSI Output versus Temperature-MixerCondition 2(Mixer input) 2.4 2.0 RSSI Output Voltage Vrssi(V) RSSI Output Voltage Vrssi(V) 2.4 RSSI Output versus Temperature-IF- 70dBuVEMF 60dBuVEMF 1.6 50dBuVEMF 1.2 40dBuVEMF 30dBuVEMF 0.8 20dBuVEMF 0.4 Condition 1(IF input) 2.0 1.6 70dBuVEMF 1.2 60dBuVEMF 50dBuVEMF 0.8 40dBuVEMF 0.4 30dBuVEMF 20dBuVEMF 0.0 0.0 -40 -20 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 -20 Condition 1(IF input),LPF OUT=0.45V Quick Charge/Discharge Current Ich(uA) -30 -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