MOTOROLA MC3356P

Order this document by MC3356/D
The MC3356 includes Oscillator, Mixer, Limiting IF Amplifier, Quadrature
Detector, Audio Buffer, Squelch, Meter Drive, Squelch Status output, and
Data Shaper comparator. The MC3356 is designed for use in digital data
communciations equipment.
• Data Rates up to 500 kilobaud
•
•
•
WIDEBAND
FSK
RECEIVER
Excellent Sensitivity: – 3 dB Limiting Sensitivity
Excellent Sensitivity: 30 µVrms @ 100 MHz
Highly Versatile, Full Function Device, yet Few External Parts are
Required
Down Converter Can be Used Independently — Similar to NE602
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 738
DW SUFFIX
PLASTIC PACKAGE
CASE 751D
(SO–20L)
Figure 1. Representative Block Diagram
RF
VCC
PIN CONNECTIONS
RF
Ground
1
20
2
19
3
18
OSC
4
Mixer
Data Shaping
Comparator
+
5
Ceramic
Filter
6
7
–
17
Ground
Data
Output
VCC
16
15
Comparator –
+
Meter Current
RF
Input
14
Squelch
Status
Hysteresis
Buffer
Limiter
8
13
9
12
10
11
Squelch
Adjust
(Meter)
RF Ground 1
20 RF Input
OSC Emitter 2
19 Ground
OSC Collector 3
RF VCC 4
17 + Comparator
Mixer Output 5
16 – Comparator
IF VCC 6
14 Squelch Control
Limiter Bias 8
13 Buffered Output
Limiter Bias 9
12 Demodulator
Filter
Quad Bias 10
11 Quad Input
ORDERING INFORMATION
Device
MC3356DW
MC3356P
Operating
Temperature Range
TA = – 40 to +85°C
 Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
15 Squelch Status
Limiter Input 7
Quadrature Detector
Tank
VCC
18 Data Output
Package
SO–20L
Plastic DIP
Rev 0
1
MC3356
MAXIMUM RATINGS
Rating
Power Supply Voltage
Symbol
Value
Unit
VCC(max)
15
Vdc
Operating Power Supply Voltage Range (Pins 6, 10)
VCC
3.0 to 9.0
Vdc
RF VCC
3.0 to 12.0
Vdc
Junction Temperature
TJ
150
°C
Operating Ambient Temperature Range
TA
– 40 to + 85
°C
Storage Temperature Range
Tstg
– 65 to + 150
°C
Power Dissipation, Package Rating
PD
1.25
W
Operating RF Supply Voltage Range (Pin 4)
ELECTRICAL CHARACTERISTICS (VCC = 5.0 Vdc, fo = 100 MHz, fosc = 110.7 MHz, ∆f = ±75 kHz, fmod = 1.0 kHz, 50 Ω source,
TA = 25°C, test circuit of Figure 2, unless otherwise noted.)
Characteristics
Min
Typ
Max
Unit
Drain Current Total, RF VCC and VCC
–
20
25
mAdc
Input for – 3 dB limiting
–
30
–
µVrms
–
60
–
µVrms
2.5
–
–
Mixer Input Resistance, 100 MHz
–
260
–
Ω
Mixer Input Capacitance, 100 MHz
–
5.0
–
pF
Mixer/Oscillator Frequency Range (Note 1)
–
0.2 to 150
–
MHz
IF/Quadrature Detector Frequency Range (Note 1)
–
0.2 to 50
–
MHz
AM Rejection (30% AM, RF Vin = 1.0 mVrms)
–
50
–
dB
Demodulator Output, Pin 13
–
0.5
–
Vrms
Meter Drive
–
7.0
–
µA/dB
Squelch Threshold
–
0.8
–
Vdc
Input for 50 dB quieting
(
S+N
N
)
Mixer Voltage Gain, Pin 20 to Pin 5
NOTE: 1. Not taken in Test Circuit of Figure 2; new component values required.
Figure 2. Test Circuit
Squelch
Status
Demod
Out
Data Output
100 MHz
RF Input
3.0 k
0.1
0.01
0.01
390 k
20
RF Input
L1 – 110.7 MHz, 0.4 µH
L1 – 7T #22, 3/16 Form
L1 – w/slug & can
L2 – 10.7 MHz, 1.5 µH
L2 – 20T #30, 3/16 Form
L2 – w/slug & can
T1 – muRata
T1 – SFE10.7 MA5–Z
or
KYOCERA
T1 – KBF10.7MN–MA
3.3 k
18 k
10 k
51
19
18
Ground
Data
Output
3.3 k
17
Comp(+)
16
15
Comp(–)
14
Squelch
Status
Squelch
Control
470
pF
18 k
13
12
11
Demod
Out
Demod
Filter
Quad
Input
150 pF
L2
RF
Gnd
OSC
EM.
OSC
COL.
1
2
3
RF
VCC
4
Mixer
Out
Limiter
Input
VCC
6
5
Limiter
Bias
7
8
0.01
5.6 pF
Limiter
Bias
9
Quad
Bias
10
0.01
330
15 pF
VCC
L1
330
2
130 k
47 k
47 k
T1
0.01
5 Vdc
MOTOROLA ANALOG IC DEVICE DATA
MC3356
Figure 3. Output Components of Signal,
Noise, and Distortion
Figure 4. Meter Current versus Signal Input
10
700
S+N+D
METER CURRENT, PIN 14 (µA)
RELATIVE OUTPUT (dB)
0
fO = 100 MHz
fm = 1.0 kHz
∆f = ± 75 kHz
–10
–20
–30
N+D
–40
N
–50
–60
0.01
0.1
1.0
10
600
500
400
300
200
100
0
0.010
0.1
INPUT (mVrms)
1.0
10
PIN 20 INPUT (mVrms)
100
1000
GENERAL DESCRIPTION
This device is intended for single and double conversion
VHF receiver systems, primarily for FSK data transmission
up to 500 K baud (250 kHz). It contains an oscillator, mixer,
limiting IF, quadrature detector, signal strength meter drive,
and data shaping amplifier.
The oscillator is a common base Colpitts type which can
be crystal controlled, as shown in Figure 1, or L–C controlled
as shown in the other figures. At higher VCC, it has been
operated as high as 200 MHz. A mixer/oscillator voltage gain
of 2 up to approximately 150 MHz, is readily achievable.
The mixer functions well from an input signal of
10 µVrms, below which the squelch is unpredictable, up to
about 10 mVrms, before any evidence of overload.
Operation up to 1.0 Vrms input is permitted, but non–linearity
of the meter output is incurred, and some oscillator pulling is
suspected. The AM rejection above 10 mVrms is degraded.
The limiting IF is a high frequency type, capable of being
operated up to 50 MHz. It is expected to be used at 10.7 MHz
in most cases, due to the availability of standard ceramic
resonators. The quadrature detector is internally coupled to
the IF, and a 5.0 pF quadrature capacitor is internally
provided. The –3dB limiting sensitivity of the IF itself is
approximately 50 µV (at Pin 7), and the IF can accept signals
up to 1.0 Vrms without distortion or change of detector
quiescent dc level.
The IF is unusual in that each of the last 5 stages of the
6 state limiter contains a signal strength sensitive, current
sinking device. These are parallel connected and buffered to
produce a signal strength meter drive which is fairly linear for
IF input signals of 10 µV to 100 mVrms (see Figure 4).
A simple squelch arrangement is provided whereby the
meter current flowing through the meter load resistance flips
a comparator at about 0.8 Vdc above ground. The signal
strength at which this occurs can be adjusted by changing
the meter load resistor. The comparator (+) input and output
are available to permit control of hysteresis. Good positive
MOTOROLA ANALOG IC DEVICE DATA
action can be obtained for IF input signals of above 30
µVrms. The 130 kΩ resistor shown in the test circuit provides
a small amount of hysteresis. Its connection between the
3.3 k resistor to ground and the 3.0 k pot, permits adjustment
of squelch level without changing the amount of hysteresis.
The squelch is internally connected to both the
quadrature detector and the data shaper. The quadrature
detector output, when squelched, goes to a dc level
approximately equal to the zero signal level unsquelched.
The squelch causes the data shaper to produce a high (VCC)
output.
The data shaper is a complete ‘‘floating’’ comparator,
with back to back diodes across its inputs. The output of the
quadrature detector can be fed directly to either input of this
amplifier to produce an output that is either at VCC or VEE,
depending upon the received frequency. The impedance of
the biasing can be varied to produce an amplifier which
“follows” frequency detuning to some degree, to prevent data
pulse width changes.
When the data shaper is driven directly from the
demodulator output, Pin 13, there may be distortion at Pin 13
due to the diodes, but this is not important in the data
application. A useful note in relating high/low input frequency
to logic state: low IF frequency corresponds to low
demodulator output. If the oscillator is above the incoming
RF frequency, then high RF frequency will produce a logic
low (input to (+) input of Data Shaper as shown in Figures 1
and 2).
APPLICATION NOTES
The MC3356 is a high frequency/high gain receiver that
requires following certain layout techniques in designing a
stable circuit configuration. The objective is to minimize or
eliminate, if possible, any unwanted feedback.
3
MC3356
Figure 5. Application with Fixed Bias on Data Shaper
Car. Det. Out
Data Out
5.0 V
0 V or 4.0 V
18 k
3.3 k
15 k
130 k
RF In
1:2
10 k
0.01
3.0 k
3.3 k
390 k
20
19
18
RF Input
Ground
Data
Output
470
pF
0.1
10 k
17
16
Comp(+)
Comp(–)
15
Squelch
Status
18 k
14
13
12
11
Squelch
Control
Demod
Out
Demod
Filter
Quad
Input
150 pF
MC3356
5.0 V
RF
Gnd
OSC
EM.
1
2
15 pF
OSC
COL.
RF
VCC
4
3
5.6 pF
fO
Mixer
Out
5
0.01
4.0 V
Limiter
Bias
7
0.1
0.01
330
Limiter
Bias
8
330
0.01
Bead
+ 5.0 to + 12 V
Limiter
Input
VCC
6
9
Quad
Bias
10
0.01
0.01
Bead
0.1
Cer. Fil.
10.7 MHz
180
82
APPLICATION NOTES (continued)
Shielding, which includes the placement of input and
output components, is important in minimizing electrostatic or
electromagnetic coupling. The MC3356 has its pin
connections such that the circuit designer can place the
critical input and output circuits on opposite ends of the chip.
Shielding is normally required for inductors in tuned circuits.
The MC3356 has a separate VCC and ground for the RF
and IF sections which allows good external circuit isolation by
minimizing common ground paths.
Note that the circuits of Figures 1 and 2 have RF,
Oscillator, and IF circuits predominantly referenced to the
plus supply rails. Figure 5, on the other hand, shows a
suitable means of ground referencing. The two methods
produce identical results when carefully executed. It is
important to treat Pin 19 as a ground node for either
approach. The RF input should be ‘‘grounded’’ to Pin 1 and
then the input and the mixer/oscillator grounds (or RF VCC
bypasses) should be connected by a low inductance path to
Pin 19. IF and detector sections should also have their
4
bypasses returned by a separate path to Pin 19. VCC and
RF VCC can be decoupled to minimize feedback, although
the configuration of Figure 2 shows a successful
implementation on a common 5.0 V supply. Once again, the
message is: define a supply node and a ground node and
return each section to those nodes by separate, low
impedance paths.
The test circuit of Figure 2 has a 3 dB limiting level of
30 µV which can be lowered 6 db by a 1:2 untuned
transformer at the input as shown in Figures 5 and 6. For
applications that require additional sensitivity, an RF amplifier
can be added, but with no greater than 20 db gain. This will
give a 2.0 to 2.5 µV sensitivity and any additional gain will
reduce receiver dynamic range without improving its
sensitivity. Although the test circuit operates at 5.0 V, the
mixer/oscillator optimum performance is at 8.0 V to 12 V. A
minimum of 8.0 V is recommended in high frequency
applications (above 150 MHz), or in PLL applications where
the oscillator drives a prescaler.
MOTOROLA ANALOG IC DEVICE DATA
MC3356
Figure 6. Application with Self–Adjusting Bias on Data Shaper
Data
Out
5.0 V
Car. Det. Out
0 V or 4.0 V
130 k
3.3 k
1
15 k
47 k
RF In
47 k
10 k
0.01
3.3 k
1:2
470 k
20
19
18
RF Input
Ground
Data
Output
470
pF
0.1
470 pF
17
Comp(+)
16
15
Comp(–) Squelch
Status
18 k
0.1
14
Squelch
Control
13
12
11
Demod
Out
Demod
Filter
Quad
Input
f = 10.7
150 pF
1.5 µH
APPLICATION NOTES (continued)
Depending on the external circuit, inverted or
noninverted data is available at Pin 18. Inverted data makes
the higher frequency in the FSK signal a “one” when the local
oscillator is above the incoming RF. Figure 5 schematic
shows the comparator with hysteresis. In this circuit the dc
reference voltage at Pin 17 is about the same as the
demodulated output voltage (Pin 13) when no signal is
present. This type circuit is preferred for systems where the
data rates can drop to zero. Some systems have a low
frequency limit on the data rate, such as systems using the
MC3850 ACIA that has a start or stop bit. This defines the
low frequency limit that can appear in the data stream.
MOTOROLA ANALOG IC DEVICE DATA
Figure 5 circuit can then be changed to a circuit configuration
as shown in Figure 6. In Figure 6 the reference voltage for
the comparator is derived from the demodulator output
through a low pass circuit where τ is much lower than the
lowest frequency data rate. This and similar circuits will
compensate for small tuning changes (or drift) in the
quadrature detector.
Squelch status (Pin 15) goes high (squelch off) when the
input signal becomes greater than some preset level set by
the resistance between Pin 14 and ground. Hysteresis is
added to the circuit externally by the resistance from Pin 14 to
Pin 15.
5
6
19
8
9
7
6
1
20
2
3
4
13
1.0 k
2
14
135
59
5.0 k
1.0 k
1.0 k
58
15
1.0 k
5.0 k
1.0 k
3
1.0 k
135
5
9
60
1.0 k
330
6
57
17
1.0 k
5.0 k
1.0 k
16
4
135
18
1.0 k
330
7
61
19
1.0 k
10
8
5
56
135
20
1.0 k
20 pF
1.0 k
1.0 k
62
14
55
21
1.0 k
12
11
5.0 k
135
22
50 k
66
71
63
1.0 k
69
64
72
1.0 k
1.0 k
68
20 k
20 k
24
67
135
10 k
54
23
1.0 k
50 k
1.0 k
65
5.0 k
25
20 k
73
10 k
27
70
26
15
10 k
28
10 k
10 k
35
75
5.0 pF
11
Figure 7. Internal Schematic
10 k
31
1.0 k
76
29
500
32
53
1.0 k
33
135
81
77
2.0 k
30
10
83
17
10 k
34
84
85
87
86
36
37
41
42
40
89
38
78
2.0 k
43
44
91
52
34
45
46
13
12
82
51
39
92
135
1.0 k
79
2.0 k
50
225
48
90
16
93
80
2.0 k
49
47
2.5 k
94
18
MC3356
MOTOROLA ANALOG IC DEVICE DATA
MC3356
OUTLINE DIMENSIONS
P SUFFIX
PLASTIC PACKAGE
CASE 738–03
–A
–
20
11
1
10
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION “L” TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSION “B” DOES NOT INCLUDE MOLD
FLASH.
5. 738–02 OBSOLETE, NEW STANDARD 738–03.
B
C
–T
L
K
–
SEATING
PLANE
M
E
G
N
F
J 20 PL
0.25 (0.010)
D 20 PL
0.25 (0.010)
M
T
A
M
M
T B
M
DIM
A
B
C
D
E
F
G
J
K
L
M
N
MILLIMETERS
MIN
MAX
25.66 27.17
6.10
6.60
3.81
4.57
0.39
0.55
1.27 BSC
1.27
1.77
2.54 BSC
0.21
0.38
2.80
3.55
7.62 BSC
0°
15°
1.01
0.51
INCHES
MIN
MAX
1.010 1.070
0.240 0.260
0.150 0.180
0.015 0.022
0.050 BSC
0.050 0.070
0.100 BSC
0.008 0.015
0.110 0.140
0.300 BSC
0°
15°
0.020 0.040
DW SUFFIX
PLASTIC PACKAGE
CASE 751D–03
(SO–20L)
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER
SIDE.
5. 751D–01, AND –02 OBSOLETE, NEW STANDARD
751D–03.
–A
–
20
11
1
10
–B
–
0.25 (0.010)
P
M
B
M
10 PL
G
R X 45°
C
–T
SEATING
–
PLANE
M
K
D 20 PL
0.25 (0.010)
M
T
B
S
A
S
MOTOROLA ANALOG IC DEVICE DATA
F
J
DIM
A
B
C
D
F
G
J
K
M
P
R
MILLIMETERS
MIN
MAX
12.65 12.95
7.40
7.60
2.35
2.65
0.35
0.49
0.50
0.90
1.27 BSC
0.25
0.32
0.10
0.25
0°
7°
10.05 10.55
0.25
0.75
INCHES
MIN
MAX
0.499 0.510
0.292 0.299
0.093 0.104
0.014 0.019
0.020 0.035
0.050 BSC
0.010 0.012
0.004 0.009
7°
0°
0.395 0.415
0.010 0.029
7
MC3356
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
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applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
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arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.
Mfax is a trademark of Motorola, Inc.
How to reach us:
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8
◊
MC3356/D
MOTOROLA ANALOG IC DEVICE
DATA