NJM2591 100MHz INPUT 450kHz FM IF DEMODULATOR IC FOR VOICE GENERAL DESCRIPTION PACKAGE OUTLINE The NJM2591 is a wide - operating voltage, low – current FM IF demodulator IC for voice application. It includes an oscillator, mixer, limiting amplifier, quadrature detector, and active filter. The NJM2591 also has a noise detector and noise comparator with hysteresis range. NJM2591V FEATURES Wide Operating Voltage Low Operating Current Maximum Input Frequency IF Frequency Bipolar Technology Package Outline 1.8V to 9.0V 2.5mA type. at V+ =2.0V 100MHz ( reference value ) 450kHz ( standard ) SSOP16 BLOCK DIAGRAM MIX IN GND 16 15 NOISE NOISE REC DET 14 13 RSSI IF OUT QUAD AF OUT 12 11 10 9 LPF MIXER NOISE COMP RSSI QUAD DET NOISE DET BUFFER NOISE AMP FILTER AMP IF AMP OSC Ver.2004-08-25 1 2 3 4 5 6 7 8 OSC IN OSC OUT MIX OUT V+ IF IN DEC FIL OUT FIL IN -1- NJM2591 ABSOLUTE MAXIMUM RATINGS PARAMETER (Ta=25°C) SYMBOL RATINGS UNIT Supply Voltage V+ 10.0 V Power Dissipation PD 300 mW Operating Temperature Topr - 30 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=21.7MHz, flo=21.25MHz, fif=450kHz, fmod=1kHz, fdev=±1.5kHz, unless otherwise noted.) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT - 2.5 - mA 21 24 27 dB IP3 - 96 - dBuVEMF Mixer Input Resistance R in M - (10) - kΩ Mixer Input Capacitance Cin M - (3.2) - pF Mixer Output Resistance R oM 1.2 1.8 2.4 kΩ 12dBS/N - 11 - dBuV 70 100 130 mVrms 43 65 - dB - 40 - dB 1.2 1.8 2.4 kΩ 0.2 0.36 0.52 V 1.4 2.0 2.6 V Current Consumption Iccq No Signal Mixer Conversion Gain Gmix Without filter, VinMIX=46dBuVEMF, Pin3 is terminated with 1.8kΩ Mixer 3 rd Order Intercept 12 dB S/N Audio Output Voltage V od Signal to Noise Ratio S/N AM Rejection Ratio AMR IF Amplifier Input Resistance IF input VinIF=80dBuVEMF IF input VinIF=80dBuVEMF IF input, AM=30% VinIF=80dBuVEMF Rin I F + V =3.0V, IF input VinIF=30dBuVEMF V+=3.0V, IF input VinIF=100dBuVEMF RSSI Output Voltage 1 Vrssi1 RSSI Output Voltage 2 Vrssi2 Noise Detector Output Voltage V nedt Isink=0.2mA - 0.1 0.5 V Noise Detector Output Leak Current Ileak Vnrec=0.6V,Vnedt=2V - 0 5 uA Noise Detector Level “High” Vth-h - 0.5 0.7 V Noise Detector Level “Low” Vth-l 0.3 0.4 - V The values shown in parenthesis are reference values. -2- Ver.2004-08-25 NJM2591 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. NOISE NOISE REC DET 1000p V 0.3 to 3kHz AUDIO OUT + 1000p 10u 91p 0.1u 51 21.7MHz QUAD RSSI CD 3.3k 0.2mA MIX IN 16 15 14 13 AF OUT 12 11 10 9 LPF MIXER RSSI NOISE COMP QUAD DET NOISE DET BUFFER IF AMP NOISE AMP FILTER AMP OSC 1 2 3 4 5 39p 21.25 MHz 56p 10u V 0.1u + 6 IF IN 0.1u 8 150k 220p IF FILTER 1.8k 7 10k 0.1u B MIX SW 220p A IF SW 5.6k 51 31kHz 450kHz MIXOUT IF FILTER: CFWCA450KGFA (Murata Manufacturing Co., Ltd., JAPAN) Ceramic discriminator CD: CDBLA450KCAY24 (Murata Manufacturing Co., Ltd., JAPAN) CERAMIC DISCRIMINATOR (especially designed for NJM2591) To optimize some important performance, the following ceramic discriminator is available. For more information on this CD and 455KHz CD, please contact the CD supplier. CDBCB450KCAY70 (Murata Manufacturing Co., Ltd., JAPAN with the external capacitance Cd of 33pF (instead of 91pF) Ver.2004-08-25 -3- NJM2591 TERMINAL FUNCTION (Ta=25°C, V+=2.0V) Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE V+ 1 OSC IN 1.97V 22k 1 2 2 130uA OSC OUT FUNCTION Local Oscillator Input and Output. Adding an external oscillator element of crystal unit or SAW resonator forms Colpitts - type oscillator. Output of an external oscillator circuit can also input to pin1 or pin2. 1.27V GND Mixer Output. Typical input impedance is 1.8kΩ. V+ 3 MIX OUT 558mV 1.6k 3 220uA GND 4 V+ -V+ 5 51k IF IN 900 1.98V DEC IF Limiter Amplifier Input. Typical input impedance is 1.8kΩ. 900 5 6 Supply Voltage. 1.98V 6 IF Decoupling. An external decoupling Capacitor is connected. GND V+ 7 20uA FIL OUT 691mV 7 8 FIL IN Amplifier Output and Input. External RC components form a band pass filter. 8 18k 662mV GND -4- Ver.2004-08-25 NJM2591 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION Demodulated Signal Output. V+ 100uA 9 9 AF OUT 780mV GND V+ 15k 10 10 15k 400 400 QUAD 2.0V Quadrature Detector Input. Adding a 90 degree-phase shifter forms a quadrature detector circuit. A 90 degree-phase shifter mainly consists of a discriminator and a resistor. 10uA GND IF Output. Output of IF Amplifier V+ 11 IF OUT 11 1.18V 60uA GND Received Signal Strength Indicator (RSSI) Output. The output signal level is in logarithmic proportion to the IF limiter amplifier input signal of pin5. V+ 12 RSSI 12 71.8mV 45k GND Ver.2004-08-25 -5- NJM2591 Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE Noise Comparator Output. The result of noise comparator is output by comparing the output voltage of pin14 with internal reference. 13 13 FUNCTION NOISE DET -GND Noise Detector Output. The output of filter amplifier is rectified to direct current by external capacitor. V+ 14 NOISE REC 67.3mV 14 70k GND 15 GND -- -- Ground. Mixer Input. Doubly balanced to reduce spurious radiation. 16 MIX IN 1.0V 16 GND Note 1. ESD protection diodes exist between each of all terminals and V+. 2. ESD protection diodes also exist between each terminal and ground. -6- Ver.2004-08-25 NJM2591 EVALUATION BOARD The evaluation PC board is useful for your design and is intended to have more understanding of the usage and performance of this device. The circuit of this board is the same as TEST CIRCUIT. For other electrical conditions, it should be necessary to reconsider each value of external components. Note that this board is not prepared to show the recommendation of pattern and parts layout. Circuit Diagram R6 NOISE DET NOISE REC MIX IN R7 C8 51 1000p V 100 RSSI C7 0.1u C6 1000p C11 10u CD 0.3 to 3kHz R4 2.7k AUDIO OUT AF OUT C9 21.7MHz + 33p 16 15 14 13 12 11 10 9 LPF MIXER RSSI NOISE COMP QUAD DET NOISE DET BUFFER IF AMP NOISE AMP FILTER AMP OSC 1 2 C1 1000p LOCAL IN 21.25MHz 3 4 V 5 6 C2 0.1u + C10 10u CF R9 Short or Open 7 R8 C5 Open 0.1u or Short R1 150 C3 220 8 C4 220 R2 5.6k IF IN R5 51 R3 10k NOISE IN 31kHz 450kHz Note 1. This board is designed for mixer-input type and R9 / R8 are factory-configured as follows : R8 : open R9 : chip resistor of 0Ω For the case of IF-input type, please change the position of the chip resistor of 0Ω as follows ; R8 : chip resistor of 0Ω R9 : open 2. External components CF=CFWCA450KGFA-R0 (Murata) CD=CDBCB450KCAY70-R0 (Murata) Ver.2004-08-25 -7- NJM2591 Circuit Side View V+ V+ MIX IN C8 R7 LOCAL IN NOISE REC R6 C7 C1 CF Ground Side View C9 R1 R NOISE DET RSSI R4 CD R3 C3 C4 IF IN C2 C5 R8 R9 R8 C6 R9 NJM 2591 R5 AF OUT NOISE IN C10 C11 Note 1. External Components C1, C1, C6, C8=1000pF C2, C7, C5=0.1uF C3, C4=220pF C9=33pF R1=150kΩ R2=5.6kΩ R3=10kΩ R4=2.7kΩ R5, R7=51Ω R6=100kΩ R9 =OΩ R8=open C10, C11=10uF CF=CFWCA450KGFA-R0(Murata) CD=CDBCB450KCAY70-R0(Murata) 2. There are two terminals for V+. For proper operation, both of these terminals are necessary for power supply. -8- Ver.2004-08-25 NJM2591 TYPICAL CHARACTERISTICS ( Ta=25°C, V+=2.0V, unless otherwise noted ) Audio Output versus Supply Voltage Current Consumption versus Supply Voltage fif=450kHz,VinIF=80dBuVEMF,fmod=1kHz,fdev=±1.5kHz,IF SW:A No signal 110 Audio Output Voltage Vod (mVrms) 3.5 Current Consumption Iccq (mA) 3.0 2.5 2.0 1.5 1.0 0.5 100 90 80 70 60 50 40 0.0 0 2 4 6 8 Supply Voltage V+ (V) 0 10 fmix=21.7MHz,VinMIX=40dBuVEMF,flo=21.7MHz 2.5 2.5 10 fif=450kHz,VinIF=60dBuVEMF 2 RSSI Output Vrssi (V) 2 RSSI Output Vrssi (V) 4 6 8 Supply Voltage V+ (V) RSSI Output versus Supply Voltage -IF Input- RSSI Output versus Supply Voltage -Mix.Input- 1.5 1 1.5 1 0.5 0.5 0 0 0 2 4 6 Supply Voltage V+ (V) 8 0 10 4 6 8 10 S/N versus Supply Voltage - IF Input - fmix=21.7MHz,fmod=1kHz,fdev=±1.5kHz,AM=30%,flo=21.25MHz,IF SW:B 70 65 65 Signal to Noise Ratio S/N (dB) 70 60 55 50 45 fif=450kHz,fdev=±1.5kHz,fmod=1kHz,IF SW:A 60 55 50 45 40 40 0 Ver.2004-08-25 2 Supply Voltage V+ (V) S/N versus Supply Voltage -Mix.Input- Signal to Noise Ratio S/N (dB) 2 2 4 6 8 Supply Voltage V+ (V) 10 0 2 4 6 Supply Voltage V+ (V) 8 10 -9- NJM2591 IF Detuning characteristics Audio Out 12dB S/N Sensitivity versus Supply Voltage fmix=21.7MHz,fmod=1kHz,fdev=±1.5kHz,flo=21.25MHz,100dBuV,IF SW:B fif=450kHz,VinIF=80dBuVEMF,fdev=±1.5kHz,fmod=1kHz,IF SW:A 5 20 -5 16 -10 IF Detuning (dB) Mixer Input Level (dBuVEMF) 0 12 8 -15 -20 -25 -30 -35 4 -40 -45 -50 0 0 2 4 6 Supply Voltage V+ (V) 8 -20 10 Mixer Conversion Gain versus Frequency fif=450kHz,MIX OUT:1.8kΩ term. 30 24 22 20 18 16 14 12 fif=450kHz,MIX OUT:1.8kΩ term.,V+=2.0V 21.7MHz 25 100MHz 20 15 10 5 0 10 1 10 100 60 1000 Mixer Input Frequency fmix (MHz) Mixer 3rd Order Intercept 80 100 Local OSC Input Level (dBuV) 120 AF Output versus Frequency : S-Curve fmix=21.7MHz,flo=21.25MHz,MIX OUT:1.8kΩ term. 2 140 1.8 120 1.6 AF Output Voltage (Vdc) Mixer Output Level (dBuVEMF) 160 20 Mixer Conversion Gain versus OSC Input Mixer Conversion Gain Gmix (dB) Mixer Conversion Gain Gmix (dB) 26 -10 0 10 Relative Frequency to fif(kHz) 100 80 60 40 VinIF=80dBuVEMF,Without 0.3-to-3kHz filter,IF SW:A 1.4 1.2 1 0.8 0.6 0.4 20 0.2 0 20 - 10 - 40 60 80 100 Mixer Input Level VinMIX (dBuVEMF) 120 0 430 440 450 460 IF Frequency fif (kHz) 470 Ver.2004-08-25 NJM2591 S+N,N,AMR versus IF Input S+N,N,AMR versus Mixer Input fmix=21.7MHz,fmod=1kHz,fdev=±1.5k,AM=30%,flo=21.25MHz,IF SW:B 10 10 S+N 0 S+N 0 -10 S+N,N,AMR (dB) -10 S+N,N,AMR (dB) fif=450kHz,fdev=±1.5kHz,fmod=1kHz,AM=30%,IF SW:A -20 -30 AMR -40 -20 -30 -40 AMR -50 -50 N -60 -60 -70 -70 -20 0 20 40 60 80 100 Mixer Input VinMIX (dBuVEMF) N -20 120 RSSI Output Voltage Vrssi (Vdc) RSSI Output Voltage Vrssi (Vdc) 3V 2V 1 0.5 0 80 100 120 V+ = 9V 2 3V 2V 1.5 1 0.5 0 -20 0 20 40 60 80 100 Mixer Input Level VinMIX (dBuVEMF) 120 -20 Noise Comparator Characteristics 0 20 40 60 80 100 IF Input Level VinIF (dBuVEMF) 120 Noise Detector Characteristics 2 1.2 fnoise=31kHz 1.0 1.5 NOISE REC Output (V) NOISE DET Output Vndet (V) 60 fif=450kHz,IF SW:A 2.5 V+ = 9V 1.5 40 RSSI Output Voltage versus IF Input fmix=21.7MHz,flo=21.7MHz,IF SW:B 2 20 IF Input VinIF (dBuVEMF) RSSI Output Voltage versus Mixer Input 2.5 0 1 0.1V 0.5 0.8 0.6 0.4 0.2 0 0.0 0 Ver.2004-08-25 0.4 0.8 1.2 1.6 NOISE REC Output (V) 2 0 0.1 0.2 0.3 0.4 Filter Amplifier Input (mVrms) 0.5 - 11 - NJM2591 NOISE REC Output versus Temperature 0.8 3.0 Current Consumption Iccq (mA) 0.7 0.6 NOISE REC Output (V) Current Consumption versus Temperature fnoise=31kHz,FIL IN:0.2mVrms input 0.5 0.4 0.3 0.2 0.1 2.5 2.0 1.5 1.0 0.5 0.0 0.0 -40 0 40 Ambient Temperature (°C) -40 80 110 fif=450kHz,VinIF=80dBuVEMF,fmod=1kHz,fdev=±1.5kHz 100 Audio Output Vod(mVrms) Mixer Conversion Gain Gmix(dB) fmix=21.7MHz,flo=21.25MHz,MIX OUT:1.8kΩ term. 25 24 23 22 21 20 90 80 70 60 50 19 18 40 -40 0 40 Ambient Temperature (°C) 80 -40 RSSI Output versus Temperature -Mix.InputV+=3.0V,fmix=21.7MHz,flo=21.7Mz 2 80dBuVEMF 1.5 50dBuVEMF 1 30dBuVEMF 10dBuVEMF 0.5 2.5 V+=3.0V,fif=450kHz 2 100dBuVEMF 1.5 70dBuVEMF 1 50dBuVEMF 0.5 30dBuVEMF 0 0 -40 - 12 - 0 40 80 Ambient Temperature (°C ) RSSI Output versus Temperature -IF Input- RSSI Output Voltage Vrssi (Vdc) RSSI Output Voltage Vrssi (Vdc) 2.5 80 Audio Output versus Temperature Mixer Convesion Gain versus Temperature 26 0 40 Ambient Temperature (°C) 0 40 80 Ambient Temmerature (°C) -40 0 40 Ambient Temperature (°C) 80 Ver.2004-08-25 NJM2591 [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. Ver.2004-08-25 - 13 -