NJM2593 50MHz INPUT MIXER AND 450kHz FM IF DEMODULATOR IC PACKAGE OUTLINE GENERAL DESCRIPTION The NJM2593 is an FM IF demodulator IC with 450kHz(standard) IF frequency, which operates from 1.8V to 9V supply, low-current. 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 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 4.5kΩ (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 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.2014-12-22 1 2 3 4 5 6 OSC (B) OSC (E) MIX OUT V+ IF IN DEC 7 8 FSK FSK VREF1 VREF2 9 10 IF OUT QUAD IN -1- NJM2593 ABSOLUTE MAXIMUM RATINGS PARAMETER (Ta=25°C) SYMBOL RATINGS UNIT Supply Voltage V+ 10.0 V Power Dissipation Pd 300 mW 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 2.0 9.0 V ELECTRICAL CHARACTERISTICS (Ta=25°C, V+=2.0V, fmix=21.7MHz, flo=21.25MHz, fif=450kHz, fmod=600Hz, fdev=±2kHz, unless otherwise noted) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT - 1.2 1.5 mA 17 20 23 dB IP3 - 95 - dBuV Mixer Input Resistance R in M - 4.5 - kΩ Mixer Input Capacitance C in M - 2.0 - pF Mixer Output Resistance R oM - 1.8 - kΩ Signal to Noise Ratio 1 S/N1 - 60 - dB Signal to Noise Ratio 2 S/N2 40 60 70 dB Signal to Noise Ratio 3 S/N3 20 30 40 dB -3dB Limiting Sensitivity Vin(lim) IF input - 22 - dBuVEMF IF input, AM=30% VinIF=60dBuVEMF - 50 - dB - 1.8 - kΩ 0.35 0.5 0.65 V Current Consumption Iccq No signal Mixer Conversion Gain Gmix VinMIX=60dBuVEMF, Measured at Pin3, without IF filter, with 1.8kΩ+0.1uF Mixer 3 rd Order Intercept AM Rejection Ratio AMR IF Amplifier Input Resistance RinIF RSSI Output Voltage Vrssi -2- Mixer input VinMIX=60dBuVEMF IF input VinIF=60dBuVEMF IF input VinIF=25dBuVEMF IF input VinIF=40dBuVEMF Ver.2014-12-22 NJM2593 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 Ver.2014-12-22 TEST CONDITIONS IF input VinIF =60dBuVEMF IF Input VinIF=60dBuVEMF FSK REF=GND LPFOUT=0.4V MIN. TYP. MAX. UNIT 70 80 90 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 l e ve l VCARRIER SENSE=0.8V - 0.0 - uA IfskH VFSK OUT=V+ - 0.0 - uA VfskL IFSK OUT=100uA - 0.1 0.4 V -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 21.7MHz 100k 1000p RF IN 0.01u Lo Hi 100k 68k 68k 560p 68k 3300p 51 20 19 18 17 16 15 14 12 + + - MIXER 13 + - RSSI COMP FSK COMP BUFFER 11 FILTER AMP RSSI CHARGE QUAD DET + - OSC IF AMP 1 1000p 2 3 4 OPEN 6 7 8 9 10 + V 1000p C1 0.1u 0.1u 10u LO IN 21.25MHz 5 + 10u V 51 B IF IN A 10u 450kHz IF SW IF FILTER CD R1 51 Test Circuit 2 (for Gmix) SENSE RSSI CARRIER FSK LEVEL OUT SENSE OUT AF OUT CHARGE SWITCH V+ 1000p 21.7MHz 100k 1000p RF IN 0.01u Lo Hi 100k 68k 68k 560p 68k 3300p 51 20 19 18 17 16 15 14 + + - MIXER 13 11 + - RSSI COMP FSK COMP BUFFER 12 RSSI FILTER AMP CHARGE QUAD DET + - OSC IF AMP 1 1000p 2 3 0.1u 4 MIX OUT 7 0.1u 10 B A IF SW + 10u 1.8k IF FILTER 9 C1 0.1u 51 -4- 8 + 10u 51 6 V 1000p LO IN 21.25MHz 5 V CD R1 IF IN 450kHz 10u Ver.2014-12-22 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.2014-12-22 -5- NJM2593 TERMINAL FUNCTION (Ta=25°C, V+=2.0V) Pin No. 1 SYMBOL EQUIVARENT CIRCUIT V+ OSC (B) VOLTAGE FUNCTION 1.98V 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. 20k 1 2 2 80u OSC (E) 1.28V Mixer Output An external 455kHz ceramic filter is connected. The typical output impedance is 2kΩ. V+ 100k 3 MIX OUT 1.18V 20p 1.1k 3 100u 4 V+ - - V+ 5 IF IN 1.96V 50k 900 900 5 6 6 DEC 1.96V V+ 7 -6- FSK VREF1 7 0.46V 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 1.8kΩ. 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. Ver.2014-12-22 NJM2593 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE V+ 8 FSK VREF2 0.44V 8 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 1.14V 9 40u Quadrature Detector Input An external phase - shifting coil or ceramic discriminator is connected. V+ 10 10 400 400 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 0.44V 11 18u Ver.2014-12-22 -7- NJM2593 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE V+ 12 6u LPF IN 0.45V 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 0.45V V+ 14 CHARGE SW -- 300k 14 V+ 6u 15 15 FSK OUT -- 3u -8- 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. 16 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. -- Ver.2014-12-22 NJM2593 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 0.02V 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 = 4.5kΩ and CinM = 2pF(at 21.7MHz). 20 MIX IN 5k 5k 1.03V 20 20p 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.2014-12-22 -9- NJM2593 APPLICATION CIRCUIT Local Oscillator with External Crystal and LC Resonant Elements RSSI CARRIER FSK OUT SENSE OUT 1st IF V 20 19 18 + V 17 CHARGE SWITCH + 16 15 14 + - MIXER Lo Hi 13 + 11 + - RSSI COMP FSK COMP FILTER AMP NJM2593 RSSI BUFFER 12 CHARGE QUAD DET + - OSC IF AMP 1 2 3 4 5 V 6 + 7 8 9 10 + CDEC CREF DET Tank V + IF Filter External Local Oscillator Signal Input RSSI CARRIER FSK OUT SENSE OUT V 1st IF 20 19 18 CHARGE SWITCH V+ + 17 16 15 14 + - MIXER Lo Hi 13 + 11 + - RSSI COMP FSK COMP FILTER AMP NJM2593 RSSI BUFFER 12 CHARGE QUAD DET + - OSC IF AMP 1 2 3 4 5 V+ 6 7 CDEC 8 9 CREF DET Tank External Oscillator - 10 - 10 + V+ IF Filter Ver.2014-12-22 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 V R6 100k RF IN R11 51 20 19 18 15 14 13 12 C8 3300p 11 FILTER AMP RSSI CHARGE QUAD DET + IF AMP OSC 2 C1 NC 1000p LO IN R3 68k + - RSSI COMP FSK COMP 1 R2 68k 0.01 + BUFFER R4 68k C6 R5 100k + - MIXER + C7 560p C9 1000 p 16 17 C10 1000p Lo 3 C3 4 1000p 5 C13 10u R8 51 7 C4 0.1u 8 + C12 NC 10u C2 0.1u B IF FILTER 6 + V A C2 Position 9 10 C5 22p V CD IF IN + R1 3.3k R9 51 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.2014-12-22 - 11 - NJM2593 Circuit Side View LO IN RF IN R8 R11 C1 B Position SENSE LEVEL C9 C2 C2 IC1 NJM2593 C6 C4 C7 C5 C12 RSSI OUT R2 R4 IF IN R9 C1 0 C8 CD R3 R6 R1 A Position CARRIER SENSE R5 SW NJM2593 V+ AF OUT FSK OUT Hi : Charge ON Lo: Charge OFF Ground Side View C3 CF C13 C12 Note: 1. External Components C1, C3, C9,C10=1000pF C2,C4=0.1uF C5=18pF C6=0.01uF C12,C13=10uF R1=3.3kΩ R2,R3,R4=68kΩ R5,R6=100kΩ R8,R9,R11=51Ω CF=CFWCA450KGFA-R0 (Murata manufacturing Co., Ltd.) CD=CDBKB450KCAY75-R0 (Murata manufacturing Co., Ltd.) - 12 - C7=560p C8=3300pF Ver.2014-12-22 NJM2593 TYPICAL CHARACTERISTICS ( Ta=25°C, V+=2.0V, unless otherwise noted ) Current Consumption versus Supply Voltage 1.5 Measured at Pin3,terminated with 1.8kΩ and 0.1uF 30 Mixer Conversion Gain Gmix(dB) Current Consumption Iccq(mA) Mixer Conversion Gain versus Supply Voltage No Input signal 1.0 0.5 25 20 Fmix=21.7MHz 15 10 5 0 0.0 0 2 4 6 Supply Voltage V+(V) 8 0 10 2 Demodulated Output versus Supply Voltage 10 Condition 1(IF input) 150 60 Duty Ratio of Wave Shaped Output(%) Demodulated Output Level Vod(mVrms) 8 FSK Duty Ratio vesus Supply Voltage Condition 1(IF input) 125 100 75 50 25 0 55 CHARGE SW=OFF 50 CHARGE SW=ON 45 40 0 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) Condition 1(IF input) 80 30 Limiting Sensitivity Vin(lim)(dBuVEMF) 70 Signal to Noise Ratio S/N1(dB) 4 6 Supply Voltage V+(V) 60 50 40 30 20 25 20 15 10 5 10 0 0 0 Ver.2014-12-22 2 4 6 Supply Voltage V+(V) 8 10 0 2 4 6 Supply Voltage V+(V) 8 10 - 13 - NJM2593 Mixer Conversion Gain versus Frequency Measured at Pin3,terminated with 1.8kΩ and 0.1uF Mixer Conversion Gain Gmix(dB) 30 25 20 15 10 5 0 10 100 1000 Mixer Input Frequency fmix(MHz) AF Output versus Frequency:S-Curve Mixer Conversion Gain versus OSC Input 1200 25 1000 AF Output Voltage(mV) Mixer Conversion Gain Gmix(dB) Condition 1(IF input) Measured at Pin3,terminated with 1.8kΩ and 0.1uF 30 Fmix=21MHz 20 15 10 Fmix=50MHz 800 600 400 5 200 0 60 70 80 90 100 110 0 120 430 Local OSC Input Level (dBuV) IF Detuning Characterisitics 2.4 IF Detuning(dB) -5 -10 -15 -20 -25 -30 - 14 - 470 Condition 1(IF input),SENSE LEVEL=0.8V 0 435 450 460 IF Frequency fif(kHz) Carrier Sense Characteristics Condition 1(IF input) RSSI Comparator Output Voltage(V) 5 440 2.0 1.6 1.2 0.8 0.4 0.0 440 445 450 455 IF Frequency fif(kHz) 460 465 0 0.4 0.8 1.2 1.6 RSSI Output Voltage Vrssi(V) 2 Ver.2014-12-22 NJM2593 S+N,N,AMR versus IF Input S+N,N,AMR versus Mixer Input Condition 2(Mixer input),AM=30% 10 10 Condition 1(IF input),AM=30% 0 0 S+N S+N -10 S+N,N,AMR(dB) S+N,N,AMR(dB) -10 -20 -30 AMR -40 -50 -20 -30 -40 AMR -50 -60 -60 N N -70 -70 -80 -80 -20 0 20 40 60 80 100 Mixer Input Level VinMIX(dBuVEMF) -20 120 20 40 60 80 100 IF Input Level VinIF(dBuVEMF) 120 RSSI Output versus IF Input RSSI Output versus Mixer Input Condition 1(IF input) Condition 2(Mixer input) 2.0 2.0 1.8 V+=2.0V 1.8 V+=2.0V RSSI Output Voltage Vrssi(V) RSSI Output Voltage Vrssi(V) 0 1.6 1.4 1.2 1.0 0.8 0.6 0.4 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.2 0.0 0.0 -20 0 20 40 60 80 100 120 Mixer Input Level VinMIX(dBuVEMF) -20 0 20 40 60 80 100 IF Input Level VinIF(dBuVEMF) 120 Mixer Conversion Gain versus Temperature Measured at Pin3,terminated with 1.8kΩ and 0.1uF Mixer Conversion Gain Gmix(dB) 30 25 20 Fmix=21.7MHz 15 10 5 0 -40 Ver.2014-12-22 -20 0 20 40 60 80 Ambient Temperature Ta(°C) 100 - 15 - NJM2593 RSSI Output versus Temperature-MixerRSSI Output versus Temperature-MixerCondition 2(Mixer 2(Mixer input) input) Condition 2.0 2.0 2.5 2.4 RSSI RSSI Output Output Voltage Voltage Vrssi(V) Vrssi(V) RSSI RSSI Output Output Voltage Voltage Vrssi(V) Vrssi(V) 2.5 2.4 RSSI Output versus Temperature-IFRSSI Output versus Temperature-IF- 70dBuVEMF 70dBuVEMF 60dBuVEMF 1.6 1.5 60dBuVEMF 50dBuVEMF 1.2 50dBuVEMF 40dBuVEMF 40dBuVEMF 30dBuVEMF 1.0 0.8 30dBuVEMF 20dBuVEMF 20dBuVEMF 0.5 0.4 Condition 1(IF 1(IF input) input) Condition 2.0 2.0 1.6 1.5 70dBuVEMF 70dBuVEMF 1.2 60dBuVEMF 60dBuVEMF 1.0 0.8 50dBuVEMF 50dBuVEMF 40dBuVEMF 40dBuVEMF 0.5 0.4 30dBuVEMF 20dBuVEMF 0.0 0.0 0.0 -40 -20 00 20 40 60 80 20 40 60 80 Ambient Ambient Temperature Temperature Ta(°C) Ta(°C) 100 100 -40 -40 -20 -20 20 40 60 80 00 20 40 60 80 Ambient Temperature Temperature Ta(°C) Ta(°C) Ambient 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.2014-12-22