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NJM2550
10.7MHz INPUT FM IF DEMODULATOR
GENERAL DESCRIPTION
The NJM2550 is a wide-operating voltage, low-current FM IF demodulator IC with 10.7MHz(standard) IF frequency. It includes a limiting amplifier, quadrature detector, filter amplifier, FSK/ASK(OOK) comparator, RSSI thermal characteristics correction, and quick charge circuit The NJM2550 is suitable for low power, narrow band receiver for short range data/voice transmission by using IF=10.7MHz or IF/carrier frequency of up to 50MHz.
PACKAGE OUTLINE
NJM2550V
FEATURES
Wide Range Operating Voltage Low Operating Current Wide Range IF Input Frequency 2V to 9V 4.4mA at V+ =3V 10.7MHz (standard) 5MHz to 50MHz (reference value) 1MHz (reference value) 2Mbps (reference value)
Wide Band FM Detector Circuit High-speed Transmission Rate FSK/ASK (OOS) Comparator Two External Resistors to Adjust RSSI `s Thermal Characteristics Bipolar Technology Package Outline SSOP16
BLOCK DIAGRAM
RSSI OUT 16
CHARGE COMP SWITCH OUT 15 14
COMP REF 13
COMP IN 12
FSK VREF 11
AMP OUT 10
AMP IN 9 BUFF AMP
+ + -
COMP CHARGE
RSSI IF AMP QUAD DET
1 RSSI REF
2 GND
3 IF IN
4 DEC
5 V+
6 IF OUT
7 QUAD IN
8 AF OUT
Ver.2006-02-24
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NJM2550
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
RECOMMENDED OPERATIONAL CONDITION
PARAMETER Supply Voltage SYMBOL V+ TEST CONDITIONS MIN. 2.0 TYP. 3.0 MAX. 9.0
(Ta=25C) UNIT V
ELECTRICAL CHARACTERISTICS (Ta=25C, V+=3 V, f i f=10.7MHz, fmod=1kHz, fdev=100kHz, unless otherwise noted)
PARAMETER Current Consumption IF Amplifier Input Resistance Signal to Noise Ratio 1 SYMBOL Iccq Rin S/N1 VinIF=80dBuV f i f = 10.7MHz - 3dB Limiting Sensitivity Vin(lim) f i f = 50MHz Demodulated Signal Level Demodulated Signal Frequency Characteristics Buffer Amplifier Gain AM Rejection Ratio Duty Ratio of Wave Shaped Output Quick Charge / Discharge Current V od fDET Gamp AMR DR I ch VinIF=80dBuV Based on fmod=1kHz Measured at -3dB 1MHz VinIF=80dBuV AM=30% VinIF=80dBuV V COMP REF=GND V COMP IN = 0.3V 80 -1 40 120 (40) 120 1 0 50 50 210 3 0.1 180 1 60 300 mVrms MHz dB dB % uA V V TEST CONDITIONS
No Signal V COMP REF=0.6V V COMP IN = 0.65V
MIN. -
TYP. 4.4 330 60 30
MAX. 5.8 -
UNIT mA dB
dBuV
High Level Voltage of VfskH 1k load COMP OUT Terminal Low Level Voltage of VfskL 1k load COMP OUT Terminal The values shown in parenthesis are reference values.
Ver.2006-02-24
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NJM2550
PARAMETER RSSI Dynamic Range Low Level Voltage of RSSI High Level Voltage of RSSI RSSI Output Voltage 1 RSSI Output Voltage 2 1pin Terminal Voltage SYMBOL RSSI VrssiL VrssiH Vrssi1 Vrssi2 V 1p No signal VinIF=110dBuV VinIF=80dBuV f i f =50MHz, VinIF=80dBuV 33k load TEST CONDITIONS MIN. TYP. 65 100 1.55 1.2 1.15 1.1 MAX. UNIT dB mV V V V V
REFERENCE (Ta=25C, V+=3 V, f i f=10.7MHz, fmod=1kHz, fdev=100kHz, unless otherwise noted)
PARAMETER SYMBOL RSSI Output Signal Rise-up Time FM Demodulated Signal Rise-up Time TEST CONDITIONS V+ =on IF Signal = off on IF Signal=on V+ = off on V+ =on IF Signal = off on IF Signal=on V+ = off on MIN. TYP. 50 600 20 600 MAX. UNIT usec usec usec usec
Ver.2006-02-24
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NJM2550
TEST CIRCUIT
This test circuit allows the measurement of all parameters described in "ELECTRICAL CHARACTERISTICS". This test circuit includes an electrical switch that should be in the suitable position for the measurement of each parameter. Circuit Diagram
RSSI OUT
CHARGE SWITCH
V+ 100k
COMP OUT 100k 10u
+
AMP OUT 3300p 100k 330p 11 10 9 BUFF AMP 68k 68k 68k 1000p
1000p 7.5k 16 15
14
13
12
+ + -+ -
COMP
CHARGE
RSSI IF AMP QUAD DET
1
2
3 0.01u
4 0.01u
5
6 2p V+
+
7 R50
8 R10 1k V+ AF OUT
33k
30p RSSI REF
51 IF IN
10u 0.1u Tquad
External Components * f i f =10.7 MHz Tquad : IF transformer for detection, 4165-T070 (Sumida corporation) R10 : 1k R50 : open * f i f =50MHz Tquad : IF transformer for detection, 2261-T080 (Sumida corporation) R10 : 1k R50 : 7.5 k * The external resistors connected to1pin and 16pin should have the same thermal coefficient.
Ver.2006-02-24
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NJM2550
TERMINAL FUNCTION (Ta=25C, V+=3 V)
Pin No. SYMBOL EQUIVARENT CIRCUIT
V+
VOLTAGE
FUNCTION RSSI Reference Current Control To control RSSI reference current, a resistor is connected to pin1 and pin6, respectively. The recommended value is 33k. By choosing the different thermal coefficient of these two resisters, RSSI thermal characteristics can be changed.
1
RSSI REF
1
50k
1.12V
GND
2
GND
-V+
--
Ground IF Limiter Amplifier Input The typical input impedance is 330.
3
IF IN
165
64k
2.46
165
3
4
DEC
4
GND
IF Decoupling An external decoupling capacitor is connected to enhance stability. 2.46V
Supply Voltage
5
V+
5
V+
GND
--
V+
IF Limiter Amplifier Output An external phase-shifting coil or discriminator is connected between pin6 and pin7. 2.06V
6
IF OUT
6
140uA
GND
Ver.2006-02-24
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NJM2550
Pin No. SYMBOL EQUIVARENT CIRCUIT
V+ 400 400
VOLTAGE
FUNCTION Quadrature Detector Input An external phase-shifting coil or discriminator is connected between pin6 and pin7.
7
QUAD IN
7
-95uA
Note that supply voltage should be the same as the voltage supplied to pin5.
GND
V+
Demodulated Signal Output An external 3rd order multiple feedback filter(RC filter) is connected between pin8 and pin9. 0.61V
8
AF OUT
8
44uA
GND
V+
9
AMP IN
20uA
--
Buffer Amplifier Input A set of external RC component forms a low pass filter between pin9 and pin10.
10 9
10
AMP OUT
210uA GND
--
Buffer Amplifier Output A set of external RC component forms a low pass filter between pin9 and pin10.
V+
11
FSK VREF
11
35k
0.61V
FSK Reference Voltage Output This pin usually keeps open. This fixed output voltage may be available for the FSK reference voltage by connecting to pin13. This usage is effective in shaping the data signal with continuous bits of the same polarity. Note that this usage is under consideration
GND
Ver.2006-02-24
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NJM2550
Pin No. SYMBOL EQUIVARENT CIRCUIT VOLTAGE FUNCTION Comparator Input This pin is an input of the wave shaping comparator.
20uA
12
COMP IN
12
--
20uA
20uA GND V+
13
COMP REF
13
--
GND
14
14
COMP OUT
GND
--
Comparator Reference Input This pin is an input of reference voltage for the wave shaping comparator. A capacitor is connected to create an average DC Level of FM demodulated signal. The value of this capacitor is dependant on the speed of data signal. A quick charge /discharge circuit offers the voltage of pin13 comes the average DC Level of FM demodulated signal very quickly. Comparator Output An open-collector output. The comparator is non-reverse type. When the frequency of IF input signal is fif +, the output is "Low". When the frequency of IF input signal is fif -, the output is "High". Instead of V+, another power source can be used within the limit of the rated supply voltage. Quick Charge / Discharge Circuit ON / OFF Control The quick charge/discharge circuit is in the active stage when pin15 is pulled up to V+. This circuit is in the stand-by stage when pin15 is pulled down to GND. Instead of V+, another power source can be used within the limit of the rated power supply voltage.
V+ 10uA
15
CHARGE SWITCH
15
300k
--
GND
Ver.2006-02-24
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NJM2550
Pin No. SYMBOL EQUIVARENT CIRCUIT
V+
VOLTAGE
FUNCTION RSSI Output Pin16 outputs DC level proportional to the log of IF input signal level to pin3.
16
RSSI OUT
16
--
GND
*
Note : 1. ESD protection diodes exist between each of the following pins and V+ Pin 1,3,4,6,8,9,10,11,16 2. ESD protection diodes also exist between each of the following pins and ground. Pin 1,3,4,6,7,8,9,10,11,12,13,14,15,16
Ver.2006-02-24
-8-
NJM2550
EVALUATION BOARD
This evaluation board may be useful for your design and to have more understanding of the usage and performance of this device. The circuit diagram and test condition of this board is the same as TEST CIRCUIT. Note that this board is not prepared to show you the recommendation of pattern and parts layout. Circuit Diagram
RSSI OUT SW1 CHARGE to V+ SWITCH R20 100k R21 C22 7.5k 1000p 16 COMP OUT R18 100k R17 100k AMP OUT
C15 R13 68k R11 68k C12 1000p
+
C19 10u 12
3300p C16 R14 330p 68k 11 10 9 BUFF AMP
15
14 + + + -
13
COMP CHARGE
IC1 NJM2550
QUAD DET
RSSI IF AMP
1 R2 33k V+ C1 30p RSSI REF
2
3 C3 0.01u R4 51 IF IN
4 C5 0.01u
5 to V C6 +
+
6 R50 C7 10u 0.1u C8 2p
7
8
R10 to V+ 1k T9 : 4165-T070
AF OUT
Note: 1. This board is designed for f i f =10.7MHz. For f i f =50MHz, please change T9 ,R10, and R50 as follows. * f i f =10.7 MHz (factory-configured) T9 : IF transformer for detection, 4165-T070 (Sumida corporation) R10 : 1k R50 : open f i f =50MHz T9 : IF transformer for detection, 2261-T080 (Sumida corporation) R10 : 1k R50 : 7.5 k
*
2. This board is designed for fdev=100kHz. For fdev=10kHz, please refer to the values shown below. * fdev=100kHz (factory-configured) Tquard related values : L=4400nH, Q=80
Rquad=1k
Ver.2006-02-24
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NJM2550
* fdev=10kHz Tquard related values :L=4400nH, Q=110 Rquad=30k
3. The external resistors connected to1pin and 16pin have the same thermal coefficient. By changing these thermal coefficients, RSSI thermal characteristics can be changed. 4. This board is designed to supply voltage to CHARGE SWITCH, the pull-up of COMP OUT, and the quadrature circuit from the common power source. NJM2550 permits each of CHARGE SWITCH and pull-up of COMP OUT to have another power source within the limit of the rated power supply voltage. Note that the voltage supplied to the quadrature circuit should be the same as the voltage supplied to pin5. 5. List of Components Item Resistor Number R2 R4 R10 R11 R13 R14 R17 R18 R20 R21 R50 value 33k 51 1k 68k 68k 68k 100k 100k 100k 7.5k open Item Capacitor Number C1 C3 C5 C6 C7 C8 C12 C15 C16 C19 C11 value 30p 0.01u 0.01u 10u 0.1u 2p 1000p 3300p 330p 10u 1000p
IC Switch Transformer
IC1 SW1 T9
NJM2550 --------4165-T070
Ver.2006-02-24
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NJM2550
Pattern Layout
10uF
COMP OUT OFF CHARGE SW ON RSSI OUT 21 22 15 NJM2550 20
100k
19
18 17
100k 100k 330pF
AMP OUT
68k
14
16 12 13
1000pF
7.5k1000pF
3300pF
RSSI REF
68k
1 2 5
11
68k 30pF 33k 0.01uF
8
AF OUT
2pF
9 10
4165-T070 (Sumida Corportion)
1k
3
0.01uF
GND
V+
7
51
4
0.1uF
IF IN
6
10uF
Ver.2006-02-24
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NJM2550
TYPICAL CHARACTERISTICS
Current Consumption versus Supply Voltage 6
Current Consumption Iccq(mA)
Demodulated Signal Level versus Supply Voltage 180
fdev=100kHz, fmod=1kHz, VinIF=80dBuV
5 4 3 2 1 0 0 2 4 6 8 10 Supply Voltage V+(V)
CHARGE SWITCH=OFF
FM Demodulated Signal Level Vod(mVrms)
CHARGE SWITCH=ON
160 140 120 100
fif=50MHz fif=10.7MHz
80 60 0 2 4 6 8 10 Supply Voltage V+(V)
S/N versus Supply Voltage 80
fdev=100kHz, fmod=1kHz, AM=30%
-3dB Limiting Sensitivisy versus Supply Voltage
fdev=100kHz, fmod=1kHz, AM=30%
-3dB Limiting Sensitivity Vin(lim) (dBuV)
50
Signal to Noise Ratio S/N(dB)
70
fif=10.7MHz
40 fif=10.7MHz 30 fif=50MHz 20
60
fif=50MHz
50
40 0 2 4 6 8 10 Supply Voltage V+(V)
10 0 2 4 6 8 10 Supply Voltage V+(V)
S+N,N,AMR versus IF Input Level-10.7MHzfif=10.7MHz, fdev=100kHz, fmod=1kHz, AM=30%
S+N,N,AMR versus IF Input Level-50MHz0
fif=50MHz, fdev=100kHz, fmod=1kHz, AM=30%
0
S+N
S+N
-10
S+N, N, AMR (dB)
S+N, N, AMR (dB)
-10 -20 -30 -40 -50 -60
N
N AMR
-20 -30 -40
AMR
-50 -60 -70 0 20 40 60 80 100 120 IF Input Level VinIF(dBuV)
-70 0 20 40 60 80 100 120 IF Input Level VinIF(dBuV)
Ver.2006-02-24
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NJM2550
RSSI Output versus IF Input 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 20 40 60 80 100 120 IF Input Level VinIF(dBuV)
fif=50MHz
RSSI Output versus IF Frequency 1.6
RSSI Output Voltage Vrssi(V)
RSSI Output Voltage Vrssi(V)
fif=10.7MHz
1.4 1.2 1 0.8 0.6
VinIF=80dBuV
VinIF=40dBuV
0.4 0.2 0 1 10 IF Frequency fif (MHz) 100
AF OUT versus IF Frequency(S Curve)-10.7MHz-
AF OUT versus IF Frequency(S Curve)-50MHzVinIF=80dBuV
2.5
VinIF=80dBuV
2.5 2 1.5 1 0.5 0
V+=9V
AF OUT Voltage (V)
AF OUT Voltage (V)
2 V+=3V 1.5 V+=2V 1 0.5 0 9.5 10 10.5 11 11.5 IF Frequency fif (MHz)
V+=9V V+=3V
V+=2V
49
49.5
50
50.5
51
IF Frequency fif (MHz)
Demodulated Signal Frequency Characteristics 140
Demodulated Signal Level Vod(mVrms)
fdev=100kHz, VinIF=80dBuV
IF AMP Gain versus IF Frequency 90 85 80
Simulation
120 100 80 60 40 20 0 10
fif=10.7MHz
IF AMP Gain (dB)
75 70 65 60 55 50 45 40
fif=50MHz
100
1000
10000
1
10 IF Frequency fif (MHz)
100
FM Modulation Frequency(kHz)
Ver.2006-02-24
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NJM2550
Current Consumption versus Temperature 6
Current Consumption Iccq(mA)
No input singal, COMP REF=0.6V, COMP IN=0.65V
Demodulated Signal Level versus Temperature
fdev=100kHz, fmod=1kHz, VinIF=80dBuV
180
FM Demodulated Signal Level Vod(mVrms)
CHARGE SWITCH=ON
5 4 3 2 1 0 -40 -20 0 20 40 60 80 100 120 Ambient Temperature Ta(C)
CHARGE SWITCH=OFF
160 140
fif=10.7MHz
120 100
fif=50MHz
80 60 -40 -20 0 20 40 60 80 100 120 Ambient Temperature Ta(C)
S/N versus Temperature 80
Signal to Noise Ratio S/N(dB)
fdev=100kHz, fmod=1kHz, AM=30%
- 3dB Limiting Sensitivity versus Temperature
fdev=100kHz, fmod=1kHz, AM=30%
-3dB Limiting Sensitivity Vin(lim) (dBuV)
50
70
fif=10.7MHz
40
fif=50MHz
60
fif=50MHz
30
fif=10.7MHz
50
20
40 -40 -20 0 20 40 60 80 100 120 Ambiet Temperature Ta(C)
10 -40 -20 0 20 40 60 80 100 120 Ambient Temperature Ta(C)
RSSI Output versus Temperature-10.7MHz1.8
RSSI Output Voltage Vrssi(V)
fif=10.7MHz
RSSI Output versus Temperature-50MHz1.8
fif=50MHz VinIF=100dBuV VinIF=80dBuV
RSSI Output Voltage Vrssi(V)
1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -40 -20 0 20 40
VinIF=100dBuV VinIF=80dBuV
1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -40 -20 0 20 40 60
VinIF=60dBuV
VinIF=60dBuV
VinIF=40dBuV
VinIF=40dBuV
60
80
100 120
80
100 120
Ambient Temperature Ta(C)
Ambient Temperature Ta(C)
Ver.2006-02-24
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NJM2550
Duty Ratio versus Temperature 60
VinIF=80dBuV
Duty Ratio of Wave Shaped Output DR(%)
50
40 -40 -20 0 20 40 60 80 100 120 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.
Ver.2006-02-24
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