Datasheet MC3357 Specification

    

. . . 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

• Excellent Sensitivity: Input Limiting Voltage –

(– 3.0 dB) = 5.0 µV (Typical)

• Low Number of External Parts Required

• Recommend MC3372 for Replacement/Upgrade

= 6.0 Vdc)

CC

Order this document by MC3357/D



LOW POWER

FM IF

SEMICONDUCTOR

TECHNICAL DATA

P SUFFIX

PLASTIC PACKAGE

CASE 648

V

CC

10.245 MHz

Quad

Coil

455 kHz

Filter

Figure 1. Representative Block Diagram

1

Demodulator

Mixer

With Hysteresis

Squelch Trigger

Active
Filter
Amp

+

2.0 V

_

2

3

4

5

6

7

8

Oscillator

Limiter
Amp

16

15

14

13

12

11

10

9

10.7 MHz Input

Ground

Audio Mute

Scan Control

Noise

Detector

Z1

Z2

Audio

D SUFFIX

PLASTIC PACKAGE

CASE 751B

(SO–16)

Crystal

Osc.

Mixer

Output

V

CC

Limiter

Input

Decoupling

Limiter
Output

Quad

Input

ORDERING INFORMATION

Device

MC3357D
MC3357P

PIN CONNECTIONS

2

3

4

5

6

7

8

Operating

Temperature Range

TA = – 30 to +70°C

RF

161

Input
Gnd

15

Audio

14

Mute
Scan

13

Control
Squelch

12

Input
Filter

11

Output
Filter

10

Input
Demodulator

9

Output

Package

SO–16

Plastic DIP

MOTOROLA ANALOG IC DEVICE DATA

 Motorola, Inc. 1996 Rev 5

1

MC3357

MAXIMUM RATINGS

Power Supply Voltage 4 VCC(max) 12 Vdc
Operating Supply Voltage Range 4 V
Detector Input Voltage 8 – 1.0 Vp–p
Input Voltage (VCC q 6.0 Volts) 16 V
Mute Function 14 V
Junction Temperature – T
Operating Ambient Temperature Range – T
Storage Temperature Range – T

ELECTRICAL CHARACTERISTICS (V

Drain Current Squelch Off

Drain Current Squelch On

Input Limiting Voltage (– 3 dB Limiting) 16 – 5.0 10 µV
Detector Output Voltage 9 – 3.0 – Vdc
Detector Output Impedance – – 400 – Ω
Recovered Audio Output Voltage (Vin = 10 mV) 9 200 350 – mVrms
Filter Gain (10 kHz) (Vin = 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 Ω
Mute Function High 14 1.0 10 – MΩ
Scan Function Low (Mute Off)

(V12 = 2 Vdc)

Scan Function High (Mute On)

(V12 = Gnd)
Mixer Conversion Gain 3 – 20 – dB
Mixer Input Resistance 16 – 3.3 – kΩ
Mixer Input Capacitance 16 – 2.2 – pF

(TA = 25°C, unless otherwise noted)

Rating

Characteristic

Pin Symbol Value Unit

CC

16
14

J

A

stg

= 6.0 Vdc, fo = 10.7 MHz, ∆f = ± 3.0 kHz, f

CC

4 to 8 Vdc

1.0 V

–0.5 to 5.0 V

150 °C

– 30 to + 70 °C

– 65 to + 150 °C

Pin Min Typ Max Unit

4 –

13 – 0 0.5 Vdc

13 5.0 – – Vdc

RMS

pk

= 1.0 kHz, TA = 25°C, unless otherwise noted.)

mod

–

2.0

3.0

–

5.0

mA

2

MOTOROLA ANALOG IC DEVICE DATA

MC3357

muRata

CFU

455 D

VCC = 6.0 Vdc

0.1 µF

10.245 MHz

120 pF

2.0 k

455 kHz

Filter

2.0 k

100 nF

47 k

51 k

20 pF

100 nF

10 pF

LP = 1.0 mH
CP = 100 pF
RP = 100 k

50 pF

Figure 2. T est Circuit

1

2

3

4

5

6

7

8

Ω

100 nF

16

51

15

14

390 k

8.2 k

10 k

10 k

1.0 k

+

1.0

13

12

11

10

9

µ

F

0.01

Input

10.7 MHz

2.0 Vdc

Op Amp Output

Filter In

Audio Out

µ

F

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 kΩ
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,

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 Ω 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
1 1 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 kΩ, 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 µA 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.

MOTOROLA ANALOG IC DEVICE DATA

3

MC3357

4

50 k

2221

13

25

220 k 15 k 10 k

11

20

16

50 k

14

24

23

22 k

12

19

18

17

15

26

54

50 k470

53

8

45 52

50 k

50 k

9

100 k

55

50 51

4948

46

44

43

5857

2

C

56

120 k

k

10

10 k

3

Figure 3. Circuit Schematic

14 15

10 k 10 k 30 k 20 k

10

5

3.0 k

34

20 k

1

C

30 k

5.0 k 30 k

30 k

15 k

6.2 k 33 k 33 k 33 k 33 k

32

10 k 10 k 10 k 10 k 10 k 10 k 10 k 10 k 10 k 10 k

33 34 35 36 37 38 39 40 41 42

15 k

11

10

9

8

28

29

100 k

30

5

27

100 k

15 k

4

2

16

MOTOROLA ANALOG IC DEVICE DATA

31

MC3357

OUTLINE DIMENSIONS

P SUFFIX

PLASTIC PACKAGE

CASE 648–08

ISSUE R

–A–

916

B

18

F

C

S

SEATING

–T–

PLANE

H

G

D

16 PL

0.25 (0.010) T

K

M

A

J

M

D SUFFIX

PLASTIC PACKAGE

CASE 751B–05

(SO–16)

–A–

ISSUE J

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.

DIM MIN MAX MIN MAX

L

M

A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC 2.54 BSC
H 0.050 BSC 1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0 10 0 10
S 0.020 0.040 0.51 1.01

MILLIMETERSINCHES

____

–T–

16 9

–B–

18

8 PLP

0.25 (0.010) B

G

K

SEATING

PLANE

D

16 PL

0.25 (0.010) A

M

S

B

T

C

S

M

NOTES:

M

S

R

X 45

_

F

J

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.

DIM MIN MAX MIN MAX

A 9.80 10.00 0.386 0.393
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.054 0.068
D 0.35 0.49 0.014 0.019
F 0.40 1.25 0.016 0.049

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

M 0 7 0 7

____

P 5.80 6.20 0.229 0.244
R 0.25 0.50 0.010 0.019

INCHESMILLIMETERS

MOTOROLA ANALOG IC DEVICE DATA

5

MC3357

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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. “T ypical” parameters which may be provided in Motorola
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6

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MOTOROLA ANALOG IC DEVICE DATA

MC3357/D

*MC3357/D*

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