MC3362.PDF

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. . . includes dual FM conversion with oscillators, mixers, quadrature
discriminator, and meter drive/carrier detect circuitry. The MC3362 also has
buffered first and second local oscillator outputs and a comparator circuit for
FSK detection.
•
Complete Dual Conversion Circuitry
LOW–POWER
DUAL CONVERSION
FM RECEIVER
•
Low Voltage: V CC = 2.0 to 6.0 Vdc
SEMICONDUCTOR
TECHNICAL DATA
•
Low Drain Current (3.6 mA (Typical) @ V CC = 3.0 Vdc)
•
Excellent Sensitivity: Input Voltage 0.6 m Vrms (Typical)
for 12 dB SINAD
•
Externally Adjustable Carrier Detect Function
•
Low Number of External Parts Required
P SUFFIX
PLASTIC PACKAGE
CASE 724
•
Manufactured Using Motorola s MOSAIC Process Technology
•
MC13135 is Preferred for New Designs
DW SUFFIX
PLASTIC PACKAGE
CASE 751E
(SO-24L)
Figure 1. Simplified Application in a PLL Frequency
Synthesized Receiver
Figure 2. Pin Connections and
Representative Block Diagram
RF Input
to 200 MHz
1st Mixer Input
1
24
1st Mixer Input
Figure 2.
2nd LO Output
2
X
23
Varicap Control
Input
Match
2nd LO Emitter
3
22
1st LO Tank
0.01
2nd LO Base
4
21
1st LO Tank
V CC
1
24
From PLL Phase
Detector
120 pF
2nd Mixer Output
5
X
20
1st LO Output
2
23
0.01
50 pF
3
22
V CC
6
19
1st Mixer Output
10.245 MHz
0.41
m
H
4
21
Limiter Input
7
18
2nd Mixer Input
Ceramic Filter
455 kHz
5
20
To PLL or Prescaler
Limiter
Decoupling
8
17
2nd Mixer Input
MC3362
6
19
Ceramic Filter
10.7 MHz
Limiter
Decoupling
9
16
V EE
7
18
Meter Drive
10
15
Comparator Output
1.0 +
0.1
0.1
8
17
Carrier Detect
11
14
Comparator Input
9
16
10 k
0.1
Quadrature Coil
12
X
13
Detector Output
10
15
0.1
200 k
Data
V CC
11
14
To Carrier
10 k
0.001
Detect
Indicator
ORDERING INFORMATION
12
13
Recovered
Audio
39 K
8.2 k
0.01
Operating
Temperature Range
Lp = 680 m H
Cp = 180 pF
Device
Package
MC3362DW
MC3362P
T A = – 40 to +85
C
SO–24L
Plastic DIP
W
Motorola, Inc. 1995
MOTOROLA ANALOG IC DEVICE DATA
1
°
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MC3362
MAXIMUM RATING (T A = 25 ° C, unless otherwise noted)
Rating
Pin
Symbol
Value
Unit
Power Supply Voltage (See Figure 2)
6
V CC(max)
7.0
Vdc
Operating Supply Voltage Range (Recommended)
6
V CC
2.0 to 6.0
Vdc
Input Voltage (V CC 5.0 Vdc)
1, 24
V 1–24
1.0
Vrms
Junction Temperature
–
T J
150
° C
Operating Ambient Temperature Range
–
T A
– 40 to + 85
° C
Storage Temperature Range
–
T stg
– 65 to + 150
C
ELECTRICAL CHARACTERISTICS (V CC = 5.0 Vdc, f o = 49.7 MHz, Deviation = 3.0 kHz, T A = 25 ° C, Test Circuit of Figure 3,
unless otherwise noted)
Characteristic
Pin
Min
Typ
Max
Units
Drain Current (Carrier Detect Low – See Figure 5)
6
–
4.5
7.0
mA
Input for – 3.0 dB Limiting
–
0.7
2.0
m Vrms
Input for 12 dB SINAD (See Figure 9)
–
0.6
–
m Vrms
Series Equivalent Input Impedence
–
450–j350
–
W
Recovered Audio (RF signal level = 10 mV)
13
–
350
–
mVrms
Noise Output (RF signal level = 0 mV)
13
–
250
–
mVrms
Carrier Detect Threshold (below V CC )
10
–
0.64
–
Vdc
Meter Drive Slope
10
–
100
–
nA/dB
Input for 20 dB (S + N)/N (See Figure 7)
–
0.7
–
m
Vrms
First Mixer 3rd Order Intercept (Input)
–
–22
–
dBm
First Mixer Input Resistance (Rp)
–
690
–
W
First Mixer Input Capacitance (Cp)
–
7.2
–
pF
Conversion Voltage Gain, First Mixer
–
18
–
dB
Conversion Voltage Gain, Second Mixer
–
21
–
Dector Output Resistance
13
–
1.4
–
k
W
RF
Input
Ferronics
12 –345–K
Figure 3. Test Circuit
50 W
1
24
0.01
2:6
120 pF
2
23
22
10.245
MHz
50 pF
3
10.5 Turns
Coilcraft
UNI–10/142
33 pF
4
5
21
20
FL1:
muRata CFU455D
or
Toko LFC–4551
FL1
6
MC3362
19
7
8
18
FL2
0.1
0.1
17
FL2:
muRata SFE10.7MA
or
Toko SK107M3–A0–10
6 8 k W
9
16
10
15
0.1
180 pF
11
14
12
13
Toko RMC–2A6597HM
1.0 m F
V CC
+
V EE
NOTE: See AN980 for Additional Design Information.
2
MOTOROLA ANALOG IC DEVICE DATA
°
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MC3362
Figure 4. I Meter versus Input
Figure 5. Drain Current, Recovered Audio
versus Supply
12
8.0
800
11
V CC
7.0
700
10
A
1 0
MC3362
6.0
I CC , Carr. Det. Low (RF in = 10 mV)
600
9.0
8.0
5.0
I CC , Carr. Det. High (RF in = 0 mV)
500
7.0
4.0
400
6.0
3.0
300
5.0
Recovered Audio
2.0
200
4.0
3.0
1.0
100
2.0
0
0
– 130
– 120
– 110
– 100
– 90 – 80 – 70 – 60
– 50
– 40
– 30
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
RF INPUT (dBm)
V CC (V)
Figure 6. Signal Levels
Figure 7. S + N, N, AMR versus Input
30
20
20
10
S + N
10
0
0
– 10
– 10
Second Mixer Output
– 20
– 30
First Mixer Output
Second Mixer Input
– 20
– 30
S + N 30% AM
– 40
– 40
First Mixer Input
– 50
MC3362 1 3 1 0 k 1 0 k
N
– 50
– 60
0.01
0.01
– 60
– 70
RF Input to Transform e r
– 70
– 80
– 130
– 120 – 110
– 100
– 90 – 80 – 70
– 60
– 50
– 40
– 30
– 130
– 120 – 110
– 100
– 90 – 80 – 70
– 60
– 50 – 40
– 30
RF INPUT (dBm)
RF INPUT (dBm)
Figure 8. 1st Mixer 3rd Order Intermodulation
Figure 9. Detector Output versus Frequency
20
4.0
10
0
3.0
– 10
– 20
– 30
2.0
– 40
Desired Products
– 50
3rd Order Intermod.
Products
1.0
– 60
– 70
– 80
0
– 100
– 90
– 80
– 70
– 60
– 50
– 40
– 30
– 20
– 10
0
– 40
– 30
– 20
– 10
0
10
20
30
40
RF INPUT (dBm)
RELATIVE INPUT FREQUENCY (kHz)
MOTOROLA ANALOG IC DEVICE DATA
3
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MC3362
Figure 10. PC Board Test Circuit
(LC Oscillator Configuration Used in PLL Synthesized Receiver)
RF Input
49.67 MHz
50
18 p
1000 p
1
24
W
0.01
0.47 m
2
23
Varactor Control
(keep 0.7 V V23 V CC )
0.01
V CC = 2.0 to 7.0 Vdc
(This network must be tuned to exactly
10.7 MHz above or below the incoming
RF signal.
NOTE: The IF is rolled off above 10.7
MHz to reduce L.O. feedthrough.)
3
22
1 20 p
50 p
33 p
0.41 m
4
21
10.245, Fund. Mode
32 pF Load
5
20
First Local Oscillator
Buffered Output
3.0 k
455 kHz
Cer. Filt.
CRF1
V CC
CRF1 = muRata CFU 455X – the X
suffix denotes 6.0 dB bandwidth.
R in = R out = 1.5 to 2.0 k
6
19
to V CC
C RF2
W
.
7
18
0. 1
8
17
10.7 MHz
Cer. Filt.
CRF2 = muRata SFA10.7 MF5 or
SFE10.7 or equivalent. R in = R out
= 330
0 . 1
0.1
0.1
1
. Crystal filters can be
used but impedance matching will
need to be added to ensure proper
filter characteristics are realized.
W
9
16
100 k
5 1 k
10
15
CD Adjust
10 k
FSK Data Output
(optional)
+
1 0 k
–
11
14
Carrier
Detect
3 9 k
0.001
Recovered
Audio
12
13
8.2 k
0.01
455 kHz
LC Resonator
(MC3362)
Figure 10A. Crystal Oscillator Configuration for Single Channel Application
23
2 0 k
Crystal used is series mode resonant
(no load capacity specified), 3rd overtone.
This method has not proven adequate for
fundamental mode, 5th or 7th overtone crystals.
The inductor and capacitor will need to be
changed for other frequency crystals. See
AN980 for further information.
22
0.68 m
300
V CC
21
0.68
m
20 k
38.97 MHz
4
MOTOROLA ANALOG IC DEVICE DATA
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MC3362
Figure 11. Component Placement View
Showing Crystal Oscillator Circuit
Figure 11A. LC Oscillator Component View
8
.41
m
H
.68
7
.47
m
H
m H
120p
10.245MHz
XT
.68
m
H
39 MHz
XT
.1
1 .
CF
455KHz
.1
100K
.1
2
.1
3
51K
2
10K
2
1
10K
68K
3
1
TOKO
55VLC06379GT
4
5
3
1
METER
DRIVE
DATA
REC. AUDIO
NOTES: 1. Recovered Audio components may be deleted when using
data output.
2. Carrier Detect components must be deleted in order to obtain
linear Meter Drive output. With these components in place the
Meter Drive outputs serve only to trip the Carrier Detect indicator.
3. Data Output components should be deleted in applications
where only audio modulation is used. For combined audio/data
applications, the 0.047 m F coupling capacitor will add distortion
to the audio, so a pull–down resistor at pin 13 may be required.
4. Use Toko 7MC81282 Quadrature coil.
5. Meter Drive cannot be used simultaneously with Carrier Detect output.
For analog meter drive, remove components labelled
,
2
,
and measure
A) through ammeter to V CC .
6. Either type of oscillator circuit may be used with any output circuit
configuration.
7. LC Oscillator Coil: Coilcraft UNI 10/42 10.5 turns, 0.41 m H Crystal
Oscillator circuit: trim coil, 0.68 m H. Coilcraft M1287–A.
8. 0.47 H, Coilcraft M1286–A. Input LC network used to match first mixer
input impedance to 50 W .
m
CIRCUIT DESCRIPTION
The MC3362 is a complete FM narrowband receiver from
antenna input to audio preamp output. The low voltage dual
conversion design yields low power drain, excellent
sensitivity and good image rejection in narrowband voice and
data link applications.
In the typical application (Figure 1), the first mixer
amplifies the signal and converts the RF input to 10.7 MHz.
This IF signal is filtered externally and fed into the second
mixer, which further amplifies the signal and converts it to a
455 kHz IF signal. After external bandpass filtering, the low IF
is fed into the limiting amplifier and detection circuitry. The
audio is recovered using a conventional quadrature detector.
Twice–IF filtering is provided internally.
The input signal level is monitored by meter drive circuitry
which detects the amount of limiting in the limiting amplifier.
The voltage at the meter drive pin determines the state of the
carrier detect output, which is active low.
APPLICATIONS INFORMATION
The first local oscillator can be run using a free–running
LC tank, as a VCO using PLL synthesis, or driven from an
external crystal oscillator. It has been run to 190 MHz.* A
buffered output is available at Pin 20. The second local
oscillator is a common base Colpitts type which is typically
run at 10.245 MHz under crystal control. A buffered output is
available at Pin 2. Pins 2 and 3 are interchangeable.
The mixers are doubly balanced to reduce spurious
responses. The first and second mixers have conversion
gains of 18 dB and 22 dB (typical), respectively, as seen in
Figure 6. Mixer gain is stable with respect to supply voltage.
For both conversions, the mixer impedances and pin layout
are designed to allow the user to employ low cost, readily
available ceramic filters. Overall sensitivity and AM rejection
are shown in Figure 7. The input level for 20 dB (S + N)/N is
0.7
m
V using the two–pole post–detection filter pictured.
* If the first local oscillator (Pins 21 and/or 22) is driven from a
strong external source (100 mVrms), the mixer can be used to
over 450 MHz.
MOTOROLA ANALOG IC DEVICE DATA
5
meter current (4–12
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