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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
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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.
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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
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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
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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)
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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.
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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
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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
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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
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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+
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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
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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
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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
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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
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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
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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.
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Ver.2004-08-25

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