MC3357.PDF

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Order this document by MC3357/D
. . . includes Oscillator, Mixer, Limiting Amplifier, Quadrature Discriminator,
Active Filter, Squelch, Scan Control, and Mute Switch. The MC3357 is
designed for use in FM dual conversion communications equipment.
•
Low Drain Current (3.0 mA (Typical) @ V CC = 6.0 Vdc)
LOW POWER
FM IF
•
Excellent Sensitivity: Input Limiting Voltage –
(– 3.0 dB) = 5.0 m V (Typical)
•
Low Number of External Parts Required
SEMICONDUCTOR
TECHNICAL DATA
•
Recommend MC3372 for Replacement/Upgrade
P SUFFIX
PLASTIC PACKAGE
CASE 648
D SUFFIX
PLASTIC PACKAGE
CASE 751B
(SO–16)
Figure 1. Representative Block Diagram
PIN CONNECTIONS
V CC
RF
Input
1
16
Crystal
Osc.
10.245 MHz
1
16
10.7 MHz Inpu t
2
15
Gnd
2
15
Ground
Mixer
Output
3
14
Audio
Mute
Scan
Control
Squelch
Input
Filter
Output
Filter
Input
Demodulator
Output
V CC
4
13
455 kHz
Filter
3
14
Audio Mute
Limiter
Input
5
12
4
13
Scan Control
Decoupling
6
11
5
12
Noise
Detector
Limiter
Output
Quad
Input
7
10
Limiter
Amp
11
8
9
6
Active
Filter
Amp
Z1
7
+
_
10
2.0 V
Z2
Audio
8
9
Demodulator
ORDERING INFORMATION
Quad
Coil
Device
Operating
Temperature Range
Package
MC3357D
MC3357P
T A = – 30 to +70
C
SO–16
Plastic DIP
W
Motorola, Inc. 1995
MOTOROLA ANALOG IC DEVICE DATA
1
°
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MC3357
MAXIMUM RATINGS (T A = 25 ° C, unless otherwise noted)
Rating
Pin
Symbol
Value
Unit
Power Supply Voltage
4
V CC (max)
12
Vdc
Operating Supply Voltage Range
4
V CC
4 to 8
Vdc
Detector Input Voltage
8
–
1.0
Vp–p
Input Voltage (V CC 6.0 Volts)
16
V 16
1.0
V RMS
Mute Function
14
V 14
–0.5 to 5.0
V pk
Junction Temperature
–
T J
150
C
Operating Ambient Temperature Range
–
T A
– 30 to + 70
° C
Storage Temperature Range
–
T stg
– 65 to + 150
C
ELECTRICAL CHARACTERISTICS (V CC = 6.0 Vdc, fo = 10.7 MHz, D f = ± 3 . 0 kHz, f mod = 1.0 kHz, T A = 25 ° C, unless otherwise noted.)
Characteristic
Pin
Min
Typ
Max
Unit
Drain Current Squelch Off
Drain Current Squelch On
4
–
–
2.0
3.0
–
5.0
mA
Input Limiting Voltage (– 3 dB Limiting)
16
–
5.0
10
m V
Detector Output Voltage
9
–
3.0
–
Vdc
Detector Output Impedance
–
–
400
–
W
Recovered Audio Output Voltage (V in = 10 mV)
9
200
350
–
mVrms
Filter Gain (10 kHz) (V in = 5 mV)
–
40
46
–
dB
Filter Output Voltage
11
1.8
2.0
2.5
Vdc
Trigger Hysteresis
–
–
100
–
mV
Mute Function Low
14
–
15
50
W
Mute Function High
14
1.0
10
–
M
Scan Function Low (Mute Off)
(V 12 = 2 Vdc)
13
–
0
0.5
Vdc
Scan Function High (Mute On)
(V 12 = Gnd)
13
5.0
–
–
Vdc
Mixer Conversion Gain
3
–
20
–
dB
Mixer Input Resistance
16
–
3.3
–
k W
Mixer Input Capacitance
16
–
2.2
–
pF
V CC = 6.0 Vdc
Figure 2. Test Circuit
0.1 m F
1 0. 2 45 MHz
100 nF
Input
10.7 MHz
1
16
120 pF
50 pF
51
2
15
2 .0 k
3
14
muRata
CFU
455 D
1 0 k
455 kHz
Filter
4
13
1 0 k
2.0 Vdc
5
12
100 nF
2.0 k
100 nF
6
11
Op Amp Output
47 k
390 k
1.0 k
1.0
m
F
7
10
+
Filter In
10 pF
51 k
8 .2 k
8
9
Audio Out
20 pF
0.01
m
F
L P = 1.0 mH
C P = 100 pF
R P = 100 k
W
2
MOTOROLA ANALOG IC DEVICE DATA
°
°
W
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MC3357
CIRCUIT DESCRIPTION
The MC3357 is a low power FM IF circuit designed
primarily for use in voice communication scanning receivers.
The mixer–oscillator combination converts the input
frequency (e.g., 10.7 MHz) down to 455 kHz, where, after
external bandpass filtering, most of the amplification is done.
The audio is recovered using a conventional quadrature FM
detector. The absence of an input signal is indicated by the
presence of noise above the desired audio frequencies. This
“noise band” is monitored by an active filter and a detector. A
squelch trigger circuit indicates the presence of a noise (or a
tone) by an output which can be used to control scanning. At
the same time, an internal switch is operated which can be
used to mute the audio.
The oscillator is an internally–biased Colpitts type with the
collector, base, and emitter connections at Pins 4, 1, and 2
respectively. A crystal can be used in place of the usual coil.
The mixer is doubly–balanced to reduce spurious
responses. The input impedance at Pin 16 is set by a 3.0 k W
internal biasing resistor and has low capacitance, allowing
the circuit to be preceded by a crystal filter. The collector
output at Pin 3 must be dc connected to B +, below which it
can swing 0.5 V.
After suitable bandpass filtering (ceramic or LC), the signal
goes to the input of a five–stage limiter at Pin 5. The output of
the limiter at Pin 7 drives a multiplier, both internally directly,
at Pin 9. The signal still
requires de–emphasis, volume control and further
amplification before driving a loudspeaker.
A simple inverting op amp is provided with an output at Pin
11 providing dc bias (externally) to the input at Pin 10 which is
referred internally to 2.0 V. A filter can be made with external
impedance elements to discriminate between frequencies.
With an external AM detector, the filtered audio signal can be
checked for the presence of noise above the normal audio
band, or a tone signal. This information is applied to Pin 12.
An external positive bias to Pin 12 sets up the squelch
trigger circuit such that Pin 13 is low at an impedance level of
around 60 k W , and the audio mute (Pin 14) is open circuit. If
Pin 12 is pulled down to 0.7 V by the noise or tone detector,
Pin 13 will rise to approximately 0.5 Vdc below supply where
it can support a load current of around 500 m A and Pin 14 is
internally short–circuited to ground. There is 100 mV of
hysteresis at Pin 12 to prevent jitter. Audio muting is
accomplished by connecting Pin 14 to a high–impedance
ground–reference point in the audio path between Pin 9 and
the audio amplifier.
W
MOTOROLA ANALOG IC DEVICE DATA
3
and externally through a quadrature coil, to detect the FM. The
output at Pin 7 is also used to supply dc feedback to Pin 5. The
other side of the first limiter stage is decoupled at Pin 6.
The recovered audio is partially filtered, then buffered,
giving an impedance of around 400
11023829.019.png
Figure 3. Circuit Schematic
3
4
10 k
10 k
30 k
20 k
21
22
15 k
50 k
14 15
25
50 k
13
3
4
5
20
2
10
11
16
220 k
15 k
10 k
8
3.0 k
16
11
9
10
20 k
17
19
24
15 k
14
100 k
30 k
18
12
22 k
23
30 k
5.0 k
30 k
26
50 k
C 1
15 k
470
50 k
15
8
27
45
52
32
53
54
50 k
28
9
10 k
10 k
10 k
10 k
10 k
10 k
10 k
10 k
10 k
10 k
100 k
48
49
50
51
29
44
30
43
5
55
33
34
35
36
37
38
39
40
41
42
46
100 k
C 2
31
10
k
6.2 k
33 k
33 k
33 k
33 k
10 k
120 k
56
57
58
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MC3357
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
– A–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
16
9
B
1
8
INCHES
MILLIMETERS
F
DIM MIN
MAX
MIN
MAX
C
L
A
0.740 0.770 18.80 19.55
B
0.250 0.270
6.35
6.85
S
C
0.145 0.175
3.69
4.44
D
0.015 0.021
0.39
0.53
–T–
SEATING
F
0.040
0.70
1.02
1.77
PLANE
G
0.100 BSC
2.54 BSC
H
0.050 BSC
1.27 BSC
H
K
J
M
J
0.008 0.015
0.21
0.38
G
K
0.110 0.130
2.80
3.30
L
0.295 0.305
7.50
7.74
D
16 PL
M
0
10
0
1.01
0.25 (0.010)
M
T
A
M
S
0.020 0.040
0.51
–A–
D SUFFIX
PLASTIC PACKAGE
CASE 751B–05
(SO–16)
ISSUE J
16
9
–B–
P
8 PL
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
1
8
0.25 (0.010)
M
B S
G
R X 45
F
MILLIMETERS
INCHES
DIM MIN
MAX
MIN
MAX
A
9.80 10.00 0.386 0.393
K
B
3.80
4.00 0.150 0.157
C
1.35
1.75 0.054 0.068
C
J
D
0.35
0.49 0.014 0.019
M
F
0.40
1.25 0.016 0.049
–T–
SEATING
PLANE
G
1.27 BSC
0.050 BSC
J
0.19
0.25 0.008 0.009
K
0.10
0.25 0.004 0.009
D
16 PL
M
0
7
0
7
P
5.80
6.20 0.229 0.244
0.25 (0.010)
M
T
B
S
A S
R
0.25
0.50 0.010 0.019
MOTOROLA ANALOG IC DEVICE DATA
5
10
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