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NJM2593 50MHz INPUT MIXER AND 450kHz FM IF DEMODULATOR IC GENERAL DESCRIPTION The NJM2593 is a wide-operating voltage, low-current FM IF demodulator IC with 450kHz(standard) IF frequency. It includes an oscillator, mixer, limiting amplifier, quadrature detector, active filter, and FSK comparator. The NJM2593 also has a RSSI circuit and RSSI comparator for carrier sense. NJM2593V PACKAGE OUTLINE FEATURES Wide Operating Voltage 1.8V to 9.0V Low Operating Current 1.2mA type. at V+ =2.0V, external local oscillator input Maximum Mixer Input Signal Frequency 50MHz (reference value) Mixer Input Resistance 4.5k (reference value) IF Frequency 450kHz (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 VREF1 VREF2 OUT Ver.2004-08-25 -1- NJM2593 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power Dissipation Operating Temperature Storage Temperature SYMBOL V+ Pd Topr Tstg RATINGS 10.0 300 - 40 to +85 - 40 to +125 (Ta=25C) UNIT V mW C C (Ta=25C) MIN. 1.8 TYP. 2.5 MAX. 9.0 UNIT V RECOMMENDED OPERATING CONDITION PARAMETER Supply Voltage SYMBOL V+ TEST CONDITIONS ELECTRICAL CHARACTERISTICS (Ta=25C, V+=2.0V, fmix=21.7MHz, flo=21.25MHz, fif=450kHz, fmod=600Hz, fdev=2kHz, 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, with 1.8k+0.1uF MIN. TYP. 1.2 20 95 (4.5) (2.0) 1.8 60 60 30 22 50 1.8 0.5 MAX. 1.5 27 UNIT mA dB dBuV k pF k dB dB dB dBuVEMF dB k V The values shown in parenthesis are reference values. -2- Ver.2004-08-25 NJM2593 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. 70 40 35 TYP. 80 50 65 (0.0) 0.1 (0.0) (0.0) 0.1 MAX. 90 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- NJM2593 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. Test Circuit 1 (except for Gmix) SENSE RSSI CARRIER FSK LEVEL OUT SENSE OUT AF OUT CHARGE SWITCH V+ 1000p 1000p 100k Hi Lo 0.01u 560p 68k 68k 68k 3300p 100k RF IN 21.7MHz 51 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 1000p 2 OPEN 3 1000p 4 V 10u 5 + 6 0.1u 0.1u 51 7 10u 8 9 C1 10 V R1 CD 10u + LO IN 21.25MHz 51 B A IF FILTER IF SW 450kHz IF IN Test Circuit 2 (for Gmix) SENSE RSSI CARRIER FSK LEVEL OUT SENSE OUT AF OUT CHARGE SWITCH V+ 1000p 1000p 100k Hi Lo 0.01u 560p 68k 68k 68k 3300p 100k RF IN 21.7MHz 51 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 1000p 2 0.1u 1.8k 3 1000p 4 V 10u 5 + 6 0.1u 0.1u 51 7 10u 8 9 C1 10 V R1 CD 10u + LO IN 21.25MHz 51 MIX OUT B A IF FILTER IF SW 450kHz IF IN -4- Ver.2004-08-25 NJM2593 External components CD : Ceramic discriminator, CDBCB450KCAY70-R0 (Murata Manufacturing Co., Ltd, Japan) IF FILTER : Ceramic filter, CFWCA450KGFA-R0 (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) = 450kHz, input level(VinIF)= 60dBuVEMF, modulation frequency(fmod)=600Hz, deviation fdev=2kHz "Condition 2" is the condition for the case of Mixer Input : IF SW : in the B position MIX IN input signal: input frequency(fmix)=21.7MHz, input level(VinMIX)=60dBuVEMF, modulation frequency(fmod)=600Hz, deviation fdev=2kHz OSC(E)input signal: input frequency(fosc)=21.25MHz, 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. CDBKB450KCAY75-R0 (Murata Manufacturing Co., Ltd., Japan) Ver.2004-08-25 -5- NJM2593 TERMINAL FUNCTION (Ta=25C, 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. V+ 1 OSC (B) 1 2 1.98V 2 OSC (E) 1.28V V+ Mixer Output An external 455kHz ceramic filter is connected. The typical output impedance is 2k. 1.18V 3 MIX OUT 3 4 V+ - - Supply Voltage IF Limiter Amplifier Input This is an input to the IF amplifier after passing through 450kHz ceramic filter. The typical input impedance is 1.8k. IF Decoupling An external decoupling capacitor is connected to enhance stability. V+ 5 IF IN 5 6 1.96V 6 DEC 1.96V V+ 7 FSK VREF1 7 0.46V 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. -6- Ver.2004-08-25 NJM2593 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 0.44V V+ IF Output An external phase - shifting capacitor is connected between pin9 and pin10. 1.14V 9 IF OUT 9 V+ 10 Quadrature Detector Input An external phase - shifting coil or ceramic discriminator is connected. 10 QUAD IN 1.99V V+ FM Demodulated Signal Output An external 3rd order multiple feed - back filter (RC filter) is connected between pin11 and pin13. 0.44V 11 AF OUT 11 Ver.2004-08-25 -7- NJM2593 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 -- 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 -8- Ver.2004-08-25 NJM2593 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. 0.02V 17 V+ 17 RSSI OUT 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 = 4.5k and CinM = 2pF(at 21.7MHz). 20 MIX IN 20 1.03V 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 Ver.2004-08-25 -9- NJM2593 APPLICATION CIRCUIT Local Oscillator with External Crystal and LC Resonant Elements RSSI CARRIER FSK OUT SENSE OUT CHARGE SWITCH Hi Lo 1st IF V + V + 20 19 18 17 + - 16 15 + 14 13 12 11 MIXER + FILTER AMP RSSI COMP FSK COMP BUFFER NJM2593 RSSI + - CHARGE QUAD DET OSC IF AMP 1 2 3 4 V 5 + 6 CDEC 7 + 8 CREF 9 10 DET Tank IF Filter V+ External Local Oscillator Signal Input RSSI CARRIER FSK OUT SENSE OUT CHARGE SWITCH Hi Lo 1st IF V + V+ 20 19 18 17 + - 16 15 + 14 13 12 11 MIXER + FILTER AMP RSSI COMP FSK COMP BUFFER NJM2593 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+ - 10 - Ver.2004-08-25 NJM2593 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 R11 51 C10 1000p C9 1000 + C6 0.01 C7 560p R4 68k R2 68k R3 68k C8 3300p RF IN R5 100k 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 22p 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=CFWCA450KGFA-R0 (Murata manufacturing Co., Ltd.) CD=CDBKB450KCAY75-R0 (Murata manufacturing Co., Ltd.) Ver.2004-08-25 - 11 - NJM2593 Circuit Side View LO IN RF IN R8 R11 B Position C1 C1 0 C2 C2 C9 SENSE LEVEL R9 C6 IF IN C4 IC1 NJM2593 C7 C12 A Position C8 R1 CD R3 R6 R4 C5 R2 RSSI OUT CARRIER SENSE R5 SW NJM2593 V+ AF OUT FSK OUT Hi : Charge ON Lo: Charge OFF Ground Side View CF C13 C3 C12 Note: 1. External Components C1, C3, C9,C10=1000pF C2,C4=0.1uF C5=18pF C6=0.01uF C12,C13=10uF R1=3.3k R2,R3,R4=68k R5,R6=100k R8,R9,R11=51 CF=CFWCA450KGFA-R0 CD=CDBKB450KCAY75-R0 C7=560p C8=3300pF - 12 - Ver.2004-08-25 NJM2593 TYPICAL CHARACTERISTICS ( Ta=25C, V+=2.0V, unless otherwise noted ) Current Consumption versus Supply Voltage 1.5 No Input signal Mixer Conversion Gain versus Supply Voltage 30 Measured at Pin3,terminated with 1.8k and 0.1uF Current Consumption Iccq(mA) Mixer Conversion Gain Gmix(dB) 25 20 Fmix=21.7MHz 1.0 15 10 5 0 0.5 0.0 0 2 4 6 Supply Voltage V+(V) 8 10 0 2 4 6 Supply Voltage V+(V) 8 10 Demodulated Output versus Supply Voltage 150 Condition 1(IF input) FSK Duty Ratio vesus Supply Voltage 60 Condition 1(IF input) Demodulated Output Level Vod(mVrms) 125 100 75 50 25 0 0 2 4 6 Supply Voltage V+(V) 8 10 Duty Ratio of Wave Shaped Output(%) 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 Input80 70 Signal to Noise Ratio S/N1(dB) Condition 2(Mixer input) -3dB Limiting Sensitivity versus Supply Voltage 30 25 20 15 10 5 0 Condition 1(IF input) 60 50 40 30 20 10 0 0 2 4 6 Supply Voltage V+(V) 8 10 Limiting Sensitivity Vin(lim)(dBuVEMF) 0 2 4 6 Supply Voltage V+(V) 8 10 Ver.2004-08-25 - 13 - NJM2593 Mixer Conversion Gain versus Frequency 30 Mixer Conversion Gain Gmix(dB) Measured at Pin3,terminated with 1.8k and 0.1uF 25 20 15 10 5 0 10 100 Mixer Input Frequency fmix(MHz) 1000 Mixer Conversion Gain versus OSC Input 30 Measured at Pin3,terminated with 1.8k and 0.1uF AF Output versus Frequency:S-Curve 1200 1000 Condition 1(IF input) Mixer Conversion Gain Gmix(dB) 25 20 15 10 Fmix=50MHz Fmix=21MHz AF Output Voltage(mV) 800 600 400 200 5 0 60 70 80 90 100 110 120 0 430 440 450 460 IF Frequency fif(kHz) 470 Local OSC Input Level (dBuV) IF Detuning Characterisitics 5 0 -5 IF Detuning(dB) Condition 1(IF input) Carrier Sense Characteristics 2.4 RSSI Comparator Output Voltage(V) Condition 1(IF input),SENSE LEVEL=0.8V 2.0 1.6 1.2 0.8 0.4 0.0 -10 -15 -20 -25 -30 435 440 445 450 455 IF Frequency fif(kHz) 460 465 0 0.4 0.8 1.2 1.6 RSSI Output Voltage Vrssi(V) 2 - 14 - Ver.2004-08-25 NJM2593 S+N,N,AMR versus Mixer Input 10 0 S+N Condition 2(Mixer input),AM=30% S+N,N,AMR versus IF Input 10 0 -10 S+N Condition 1(IF input),AM=30% -10 S+N,N,AMR(dB) S+N,N,AMR(dB) -20 -30 AMR -20 -30 -40 -50 -60 AMR -40 -50 -60 -70 -80 -20 0 20 40 60 80 100 Mixer Input Level VinMIX(dBuVEMF) 120 N N -70 -80 -20 0 20 40 60 80 100 IF Input Level VinIF(dBuVEMF) 120 RSSI Output versus Mixer Input 2.0 1.8 RSSI Output Voltage Vrssi(V) 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -20 0 20 40 60 80 100 120 Mixer Input Level VinMIX(dBuVEMF) Condition 2(Mixer input) V+=2.0V RSSI Output versus IF Input Condition 1(IF input) 2.0 1.8 RSSI Output Voltage Vrssi(V) V+=2.0V 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -20 0 20 40 60 80 100 IF Input Level VinIF(dBuVEMF) 120 Mixer Conversion Gain versus Temperature 30 Measured at Pin3,terminated with 1.8k and 0.1uF Mixer Conversion Gain Gmix(dB) 25 20 Fmix=21.7MHz 15 10 5 0 -40 -20 0 20 40 60 80 Ambient Temperature Ta(C) 100 Ver.2004-08-25 - 15 - NJM2593 RSSI Output versus Temperature-MixerRSSI Output versus Temperature-Mixer2.5 2.4 RSSI Output Voltage Vrssi(V) RSSI Output Voltage Vrssi(V) 2.0 2.0 1.6 1.5 1.2 Condition 2(Mixer input) Condition 2(Mixer input) RSSI Output versus Temperature-IFRSSI Output versus Temperature-IF2.5 2.4 Condition 1(IF input) Condition 1(IF input) 70dBuVEMF 70dBuVEMF 60dBuVEMF RSSI Output Voltage Vrssi(V) RSSI Output Voltage Vrssi(V) 2.0 2.0 1.6 1.5 1.2 1.0 0.8 0.5 0.4 0.0 0.0 60dBuVEMF 50dBuVEMF 50dBuVEMF 40dBuVEMF 40dBuVEMF 30dBuVEMF 30dBuVEMF 20dBuVEMF 20dBuVEMF 70dBuVEMF 70dBuVEMF 60dBuVEMF 60dBuVEMF 50dBuVEMF 50dBuVEMF 40dBuVEMF 40dBuVEMF 30dBuVEMF 20dBuVEMF 1.0 0.8 0.5 0.4 0.0 -40 -20 0 20 40 60 80 0 20 40 60 80 Ambient Temperature Ta(C) Ambient Temperature Ta(C) 100 100 -40 -40 -20 -20 0 20 40 60 80 0 20 40 60 80 Ambient Temperature Ta(C) Ambient Temperature Ta(C) 100 100 [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 |
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