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NJM2549
WIDE BAND FM IF DEMODULATOR
GENERAL DESCRIPTION
The NJM2549 is a wide band IF IC with a maximum IF input frequency of 15 MHz. It includes an IF Amplifier, Quadrature Detector, RSSI and IF Balanced Output.
PACKAGE OUTLINE
MAIN APPLICATIONS
RF ID Radar detector Wireless Infrared Communication System Voice Transmission System A few MHz band Signal Detector
NJM2549RB2
FEATURES
Wide Range Operating Voltage Low Operating Current Wide Range IF Input Frequency Wide Band FM Detector Range RSSI Quick Response High FM Detection Sensitivity IF Amplifier with Balanced Output Bipolar Technology Package Outline 2.7V to 9V (recommended supply voltage) 3mA (standard) 10.7MHz (standard) 100kHz to 15MHz (reference value) DC to 1MHz (reference value) 22dBuV (- 3dB Limiting Sensitivity)
TVSP10
BLOCK DIAGRAM
AF OUT
QUAD IN
IF OUT1
IF OUT2
RSSI OUT
10
9
8
7
6
QUAD DET IF AMP
RSSI
1
V
Ver.2010-06-24
2
IF IN
3
IF DEC1
4
IF DEC2
5
GND
-1-
+
NJM2549
ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage Power Dissipation Operating Temperature Storage Temperature SYMBOL V
+
(Ta=25C) RATINGS 10 300 - 40 to + 85 - 50 to + 125 UNIT V mW C C
PD Topr Tstg
RECOMMENDED OPERATIONAL CONDITION
PARAMETER Supply Voltage SYMBOL V+ TEST CONDITIONS MIN. 2.7 TYP. 3 9
(Ta=25C) MAX. UNIT V
(Ta = 25C, V+ = 3V, IF IN = 10.7MHz / 80dBuV, fdev = 10kHz, fmod = 1kHz, unless otherwise noted) PARAMETER Current Consumption IF IF Input / Output Gain G IF f IF1 f IF2 IF Amplifier Input Resistance IF Output Level Duty Ratio of Wave IF Output IF Output Current RI IF VO IF DR IF I OIF IF IN = 20dBuV , Test Circuit 4 The ratio from the gain at 10.7MHz to the gain at 1MHz, Test Circuit 4 The ratio from the gain at 10.7MHz to the gain at 15MHz, Test Circuit 4 2 - 4 pin Resistance, Test Circuit 3 RL = 15k, No Modulation, Test Circuit 4 RL = 15k, No Modulation, Test Circuit 4 No Signal, Test Circuit 4 70 -3 -4 8.5 350 44 230 75 0 -1 10 425 50 290 80 3 dB 2 11.5 500 58 350 k mVpp % uA dB SYMBOL Iccq TEST CONDITIONS No Signal, Test Circuit 1 MIN. TYP. 3 MAX. 3.7 UNIT mA
ELECTRICAL CHARACTERISTICS
IF Output Gain Frequency Characteristics
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NJM2549
PARAMETER DETECTION VO DC1 Demodulated DC Level VO DC2 VO DC3 Demodulated Signal Level Demodulated Signal Level of IF/3 12dB SINAD Sensitivity - 3dB Limiting Sensitivity Signal to Noise Ratio AM Rejection Ratio Total Harmonic Distortion AF Output pin Bias Current Demodulated Signal Frequency Characteristics RSSI V RSSI1 RSSI Output Voltage V RSSI2 V RSSI3 V RSSI4 RSSI Output Resistance RSSI Dynamic Range RO RSSI DRSSI No Signal, Test Circuit 1 IF IN = 45dBuV, Test Circuit 1 IF IN = 80dBuV, Test Circuit 1 IF IN = 100dBuV, Test Circuit 1 5 - 6 pin Resistance, Test Circuit 3
X = ( VRSSI3 - VRSSI2 ) / 35, D1 = 45 - ( VRSSI2 - VRSSI1 ) / X, D2 = 80 + ( VRSSI4 - VRSSI 3 ) / X, DRSSI = D2 - D1
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
IF IN = 10.62MHz, No Modulation, Test Circuit 1 IF IN = 10.7MHz, No Modulation, Test Circuit 1 IF IN = 10.83MHz, No Modulation, Test Circuit 1 Test Circuit 1 IF IN = 3.56667MHz, 100dBuV, Test Circuit 1
0.8 2.7 120 100 160 -
0.1 1.1 2.9 150 130 33 22 45 45 0.5 205 -2
0.3 1.4 180 mVrms 160 dBuV dB 250 % uA dB V
VO AC1 VO AC2
12dBS/N Test Circuit 1 PI LIM S/N AMR THD IO AF fDET Measured at -3dB, Test Circuit 1 Ratio of S+N and N, Test Circuit 1 AM = 30%, Test Circuit 1 fdev = 30kHz, Test Circuit 1 No Signal, Test Circuit 4 fdev = 100kHz, fmod = 1kHz to 1MHz, Gain deflection, Test Circuit 6
350 1.5 1.8 12 to IF to IF
10 550 1.7 2 15 60
50 mV 750 1.85 V 2.1 18 K dB
Time taken for RSSI Output change from 10% to 90% after TRI signal turns on. Test Circuit 7 RSSI Response Time taken for RSSI Output change from 90% to 10% after TFI signal turns off. Test Circuit 7 The values shown in parenthesis are reference values.
-
4
usec
-
4
-
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NJM2549
TEST CIRCUIT
This test circuit allows the measurement of all parameters described in "ELECTRICAL CHARACTERISTICS". Test Circuit 1 (Detected Output: S-Curve)
Audio Analyzer
Input impedance = 100k LPF = 30kHz
AF OUT
V
T1
+
RSSI OUT
V
C7 0.01u
C6 82p
R2 2.4k C5 3p
C4 100p
10
9
8
7
6
QUAD DET IF AMP
RSSI
1
C1 0.01u C9 10u C8 0.01u R1 51
2
C2 0.01u
3
C3 0.01u
4
5
Zo=50
IF IN
Test Circuit 2 (Detected Output: N-Curve, the Detected Output is reversed)
Audio Analyzer
Input impedance = 100k LPF = 30kHz
AF OUT
V
T1
+
RSSI OUT
V
C7 0.01u
C6 82p
R2 2.4k
10
9
8
C5 3p
C4 100p
7
6
QUAD DET IF AMP
RSSI
1
C1 0.01u C9 10u C8 0.01u R1 51
2
C2 0.01u
3
C3 0.01u
4
5
T1:4CJH(Sample No.:080293006)
Zo=50
SAGAMI ELEC CO., LTD. (Japan)
IF IN
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NJM2549
Test Circuit 3 for Terminal Resistance
10
9
8
7
6
QUAD DET IF AMP
RSSI
1
2
3
4
5
Test Circuit 4 for IF Amplifier
Oscilloscope
A
V
T1 C7 0.01u
A
+
0.01uF Selector R2 2.4k
15k
C6 82p
10
9
8
7
6
QUAD DET IF AMP
RSSI
1
C1 0.01u C9 10u C8 0.01u R1 51
2
C2 0.01u
3
C3 0.01u
4
5
Zo=50
IF IN
T1:4CJH(Sample No.:080293006) SAGAMI ELEC CO., LTD. (Japan)
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NJM2549
Test Circuit 5 for Demodulated Signal Frequency Characteristics (Detected Output: S-Curve)
Spectrum Analyzer C7 0.01u
AF OUT
FET Probe
V
T1
+
RSSI OUT
V
C6 82p
R2 2.4k C5 3p
C4 100p
10
9
8
7
6
QUAD DET IF AMP
RSSI
1
C1 0.01u C9 10u C8 0.01u R1 51
2
C2 0.01u
3
C3 0.01u
4
5
Zo=50
IF IN
Test Circuit 6 for Demodulated Signal Frequency Characteristics (Detected Output: N-Curve)
Spectrum Analyzer C7 0.01u
AF OUT
FET Probe
V
T1
+
RSSI OUT
V
C6 82p
R2 360
10
9
8
C5 3p
C4 100p
7
6
QUAD DET IF AMP
RSSI
1
C1 0.01u C9 10u C8 0.01u R1 51
2
C2 0.01u
3
C3 0.01u
4
5
Zo=50
IF IN
T1:4CJH(Sample No.:080293006) SAGAMI ELEC CO., LTD. (Japan)
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NJM2549
Test Circuit 7 for RSSI Response
AF OUT V
T1 C7 0.01u C6 82p
+
Oscilloscope R2 2.4k C5 3p
C4 100p
10
9
8
7
6
QUAD DET IF AMP
RSSI
1
C1 0.01u C9 10u C8 0.01u R1 51
2
C2 0.01u
3
C3 0.01u
4
5
Zo=50
IF IN
Signal ON to OFF OFF to ON
Test Circuit 8 for Demodulated signal (LPF is connected)
Ca 3300p Audio Analyzer
Input impedance = 100k LPF = 30kHz
fc= 2
3
1 Hz RaRbRcCaCbCc
+
Ra 68k Cb 330p
Rb 68k
Rc 68k Cc 1000p
AF OUT V
T1
+
RSSI OUT
V
C7 0.01u
C6 82p
R2 2.4k
10
9
C5 3p
C4 100p
8
7
6
QUAD DET IF AMP
RSSI
1
C1 0.01u C9 10u C8 0.01u R1 51
2
C2 0.01u
3
C3 0.01u
4
5
Zo=50
IF IN
T1:4CJH(Sample No.:080293006) SAGAMI ELEC CO., LTD. (Japan)
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NJM2549
(Ta = 25C , V+ = 3V , No signal ) Pin No. SYMBOL EQUIVARENT CIRCUIT
1
TERMINAL FUNCTION
VOLTAGE
FUNCTION
1
V+
--
Supply Voltage
5 1
2
2 3 4
IF IN IF DEC1 IF DEC2
3 10k 4 50k 5 400uA 50k 10k
1.95V
2pin: IF Amplifier Input 3,4pin: IF Decoupling An external decoupling capacitor is connected to enhance stability. The bandwidth of IF Amplifier can be adjusted. Large capacity: narrow IF Small capacity: wide IF
1
70
6
RSSI
15k 5
6
--
Received Signal Strength Indicator Output Pin6 outputs DC level proportional to the log of pin2 input signal level.
1
70
7 8
IF OUT2 IF OUT1
7 70 8
1.25V
300uA 5
300uA
FM IF Output This is a balanced output, and the capacitor for the phase-shifter is connected between QUAD IN and either of IF OUTs. The joining terminal changes the inclination. 7pin:N-Corve 8pin:S-Corve
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NJM2549
Pin No. SYMBOL EQUIVARENT CIRCUIT
1
VOLTAGE
FUNCTION Quadrature Detector Input An external phase-shifting coil or discriminator is connected between IF OUT and pin9. Note that supply voltage should be the same as the voltage supplied to pin1.
9
QUAD IN
70 9
--
25uA 5
1
160uA
10
AF OUT
70 10
1.05V
Demodulated Signal Output Can output the wide range between ground level and supply voltage level.
5
Ver.2010-06-24
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NJM2549
EVALUATION 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
AF OUT
V
T1
+
RSSI OUT
C7 0.01u
C6 82p
R2 2.4k
C4 100p
10
9
C5 3p
8
7
6
QUAD DET IF AMP
RSSI
1
C1 0.01u C9 10u C8 0.01u
2
C2 0.01u
3
C3 0.01u
4
5
R1 51
IF IN
List of Component Items Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Capacitor Designation Value Items Designation Value C1 0.01uF Resistor R1 51 C2 0.01uF Resistor R2 2.4k C3 0.01uF C4 100pF Transformer T1 4CJH C5 3pF C6 82pF IC IC1 NJM2549 C7 0.01uF C8 0.01uF C9 10uF Note: IF transformer for detection, 4CJH(Sample No.:080293006) SAGAMI ELEC CO., LTD. (Japan)
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NJM2549
PRINTED CIRCUIT BOARD Circuit Side View
C8
C6 C1
IC1 NJM 2549
C2
C3
C4
R1
Ground Side View
C5
R2
C7
+ C9
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NJM2549
TYPICAL CHARACTERISTICS
[DC CHARACTERISTICS] (Test Circuit 1, Ta = 25C, V+ = 3V, No Signal, unless otherwise noted)
Current Consumption versus Supply Voltage and Ambient Temperature 5 5 Current Consumption versus Temperature and Supply Voltage
4
Ta= 85C
4
V+= 9.0V, 3.0V
Iccq ( mA )
Iccq ( mA )
3
25C -40C
3
2.7V
2
2
1
1
0 0 2 4 6 8 10 Supply Voltage V + ( V )
0 -50 0 50 100 Ambient Temperature Ta ( C )
[IF AMP CHARACTERISTICS] (Test Circuit 4, Ta = 25C, V+ = 3V, IF IN = 10.7MHz / 20dBuV, No Modulation, unless otherwise noted)
IF AMP Gain versus IF Frequency ( Standard Circuit ) 100
Ta= -40C, 25C, 85C
IF AMP Gain versus IF Frequency and Terminal Capacitance 100
C1=C2=C3 =1uF
80
80
GIF ( dB )
GIF ( dB )
60
60
10nF 3.3nF 1nF
40
40
20
20
0 0.1 1 10 100 IF Input Frequency ( MHz )
0 0.1 1 10 100 IF Input Frequency ( MHz )
IF AMP Gain versus Supply Voltage and Ambient Temperature 85 85
IF AMP Gain versus Temperature and Supply Voltage
80 GIF ( dB )
Ta= 85C, 25C
80 GIF ( dB )
V+= 9.0V, 3.0V, 2.7V
75
-40C
75
70
70
65 2 4 6 8 10 Supply Voltage V + ( V )
65 -50 0 50 100 Ambient Temperature Ta ( C )
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NJM2549
IF Output Level versus Supply Voltage and Ambient Temperature 550 550
IF Output Level versus Temperature and Supply Voltage
500 VO IF ( mVpp ) VO IF ( mVpp )
500
450
Ta= 85C 25C -40C
450
V+= 2.7V, 3.0V, 9.0V
400
400
350
350
300 2 4 6 8 10 Supply Voltage V+ ( V )
300 -50 0 50 100 Ambient Temperature Ta ( C )
IF Output Duty Ratio versus Supply Voltage and Ambient Temperature 60 60
IF Output Duty Ratio versus Temperature and Supply Voltage
55 DR IF ( % )
Ta= -40C 85C 25C
55 DR IF ( % )
V+= 9.0V, 3.0V, 2.7V
50
50
45
45
40 2 4 6 8 10 Supply Voltage V + ( V )
40 -50 0 50 100 Ambient Temperature Ta ( C )
IF Output Current versus Supply Voltage and Ambient Temperature 400 400
IF Output Current versus Temperature and Supply Voltage
350
Ta= -40C
350
V+= 9.0V, 3.0V, 2.7V
IO IF ( uA )
IO IF ( uA )
300
25C
300
250
-40C
250
200 2 4 6 8 10 Supply Voltage V + ( V )
200 -50 0 50 100 Ambient Temperature Ta ( C )
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NJM2549
[DEMODULATED CHARACTERISTICS (S- Curve)] (Test Circuit 1, Ta = 25C, V+ = 3V, IF IN = 10.7MHz / 20dBuV, No Modulation, unless otherwise noted)
Demodulated DC Level versus Frequency ( S-curve, BW:99MHz, Ambient Temperature ) 5 10
Demodulated DC Level versus Frequency ( S-curve, BW:99MHz, Supply Voltage )
4
8
3 VO DC ( V ) VO DC ( V )
6
2
1
Ta= -40C 25C 85C Ta=
4
V+= 9.0V 3.0V 2.7V
2
0 1 10 IF Input Frequency ( MHz ) 100
0 1 10 IF Input Frequency ( MHz ) 100
Demodulated DC Level versus Frequency ( S-curve, BW:200kHz, Ambient Temperature ) 5 5
Demodulated DC Level versus Frequency ( S-curve, BW:200kHz, Supply Voltage )
4
3 VO DC ( V )
Ta= 85C 25C -40C
4
V+=9.0V
3 VO DC ( V )
3.0V 2.7V
2
2
1
1
0 10.6 10.65 10.7 10.75 10.8 IF Input Frequency ( MHz )
0 10.6 10.65 10.7 10.75 10.8 IF Input Frequency ( MHz )
Demodulated DC Level versus Supply Voltage ( S-curve, Ambient Temperature ) 2.0 2.0
Demodulated DC Level versus Temperature ( S-curve, Supply Voltage )
1.5
Ta= 85C
1.5
V+= 9.0V
VO DC ( V )
VO DC ( V )
1.0
25C -40C
3.0V, 2.7V
1.0
0.5
0.5
0.0 2 4 6
+
0.0 8 10 -50 0 50 100 Supply Voltage V ( V ) Ambient Temperature Ta ( C )
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NJM2549
[DEMODULATED CHARACTERISTICS (N- Curve)] (Test Circuit 2, Ta = 25C, V+ = 3V, IF IN = 10.7MHz / 20dBuV, No Modulation, unless otherwise noted)
Demodulated DC Level versus Frequency ( N-curve, BW:99MHz, Ambient Temperature ) 5 10 Demodulated DC Level versus Frequency ( N-curve, BW:99MHz, Supply Voltage )
4
3 VO DC ( V )
Ta= -40C 25C 85C
8
6 VO DC ( V )
2
4
V+= 9.0V 3.0V 2.7V
1
2
0 1 10 IF Input Frequency ( MHz ) 100
0 1 10 IF Input Frequency ( MHz ) 100
Demodulated DC Level versus Frequency ( N-curve, BW:200kHz, Ambient Temperature ) 5 5
Demodulated DC Level versus Frequency ( N-curve, BW:200kHz, Supply Voltage )
4
Ta= 85C, 25C
4
V+= 9.0V 3.0V 2.7V
3 VO DC ( V )
3 VO DC ( V )
2
-40C
2
1
1
0 10.6 10.65 10.7 10.75 10.8 IF Input Frequency ( MHz )
0 10.6 10.65 10.7 10.75 10.8 IF Input Frequency ( MHz )
Demodulated DC Level versus Supply Voltage ( N-curve, Ambient Temperature ) 2.0 2.0
Demodulated DC Level versus Temperature ( N-curve, Supply Voltage )
1.5
Ta= 85C 25C -40C
1.5
V+= 9.0V
VO DC ( V )
VO DC ( V )
1.0
1.0
3.0V, 2.7V
0.5
0.5
0.0 2 4 6 8 10 Supply Voltage V+ ( V )
0.0 -50 0 50 100 Ambient Temperature Ta ( C )
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NJM2549
[DEMODULATED CHARACTERISTICS (AC Level)] (Test Circuit 1, Ta = 25C, V+ = 3V, IF IN = 10.7MHz / 80dBuV, fdev = 10kHz, fmod = 1kHz, unless otherwise noted)
S+N, N, AMR, SINAD versus IF Input Level (Test Circuit 1) 0 -10 S+N, N, AMR ( dB ) -20 -30 -40 -50 -60 -70 0 20 40 60 80 100 IF Input Level ( dBuV )
N AMR SINAD S+N
S+N, N , AMR , SINAD versus IF Input Level (Test Circuit 8) 70 60 50 40 30 20 10 0 S+N, N, AMR ( dB ) 0 -10 -20 -30 -40 -50 -60 -70 0 20 40 60 80 100 IF Input Level ( dBuV )
AMR S+N
70 60 50 40 30 20 10 0
SINAD
SINAD ( dB )
N
Detuning Characteristic ( VOAC , THD, S-Curve )
Detuning Characteristic ( VOAC , THD, N-Curve )
Circuit 1
1000
VOAC
4
1000
VOAC
Circuit 2
4
100
3 S-Curve ( V )
VOAC ( mVrms ) , THD ( % )
VOAC ( mVrms ) , THD ( % )
100
3 N-Curve ( V )
10
S-Curve
2
10
N-Curve
2
1
THD
1
1
THD
1
0.1 0 10.55 10.6 10.65 10.7 10.75 10.8 10.85 IF Input Frequency ( MHz )
0.1 0 10.55 10.6 10.65 10.7 10.75 10.8 10.85 IF Input Frequency ( MHz )
Demodulated Signal Level versus FM Modulation Frequency 175 150 125 VO AC ( mVrms ) 100 75 50 25 0 1 10
Circuit 6 fdev= 100kHz
Circuit 5 fdev= 10kHz
100
1000
10000
FM Modulation Frequency fmod ( kHz )
Ver.2010-06-24
SINAD ( dB )
- 16 -
NJM2549
Demodulated Signal Level versus Supply Voltage and Ambient Temperature 200 200
Demodulated Signal Level versus Temperature and Supply Voltage
180
Ta= 85C 25C -40C
180
V+= 9.0V
VO AC ( mVrms )
VO AC ( mVrms )
160
160
3.0V, 2.7V
140
140
120
120
100 2 4 6 8 10 Supply Voltage V+ ( V )
100 -50 0 50 100 Ambient Temperature Ta ( C )
AF Output pin Bias Current versus Supply Voltage and Ambient Temperature 350 350
AF Output pin Bias Current versus Temperature and Supply Voltage
300
Ta= 85C
300
V+= 9.0V
IO AF ( uA )
25C
IO AF ( uA )
250
250
3.0V 2.7V
200
-40C
200
150
150
100 2 4 6 8 10 Supply Voltage V+ ( V )
100 -50 0 50 100 Ambient Temperature Ta ( C )
Demodulated DC Level versus Frequency and R2 3
R2= 4.7k 2.4k 1.2k
2 VO DC ( V )
680 360
1
180
0 10.6
10.65
10.7
10.75
10.8
IF Input Frequency ( MHz )
Ver.2010-06-24
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NJM2549
[RSSI CHARACTERISTICS] (Test Circuit 1, Ta = 25C, V+ = 3V, IF IN = 10.7MHz / 80dBuV, fdev = 10kHz, fmod = 1kHz, unless otherwise noted)
RSSI Output versus IF Input Level and Ambient Temperature 2.5
Ta= 85C 25C -40C
RSSI Output versus IF Input Level and Supply Voltage 2.5
V+= 9.0V
2.0
2.0
3.0V, 2.7V
1.5 VRSSI ( V ) VRSSI ( V ) 0 20 40 60 80 100
1.5
1.0
1.0
0.5
0.5
0.0 IF Input Level ( dBuV )
0.0 0 20 40 60 80 100 IF Input Level ( dBuV )
RSSI Output versus Supply Voltage and IF Input Level 2.5
IF IN= 100dBuV
RSSI Output versus Temperature and IF Input Level 2.5
IF IN= 100dBuV
2.0
80dBuV
2.0
80dBuV
1.5 VRSSI ( V ) VRSSI ( V )
1.5
1.0
45dBuV
1.0
45dBuV
0.5
No input signal
0.5
No input signal
0.0 2 4 6
0.0 -50 0 50 100 Ambient Temperature Ta ( C )
8
10
Supply Voltage V + ( V )
RSSI Output versus Supply Voltage Frequency and IF Input Level 2.5
IF IN= 100dBuV
2.0
80dBuV
VRSSI ( V )
1.5
1.0
45dBuV
[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.
0.5
No input signal
0.0 0.1 1 10 100 IF Input Frequency ( MHz )
Ver.2010-06-24
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