Datasheet MC3357D, MC3357P Datasheet (Motorola)

Device

Operating

Temperature Range

Package



SEMICONDUCTOR

TECHNICAL DATA

LOW POWER

FM IF

ORDERING INFORMATION

MC3357D
MC3357P

TA = – 30 to +70°C

SO–16

Plastic DIP

PIN CONNECTIONS

Order this document by MC3357/D

P SUFFIX

PLASTIC PACKAGE

CASE 648

D SUFFIX

PLASTIC PACKAGE

CASE 751B

(SO–16)

2

3

Crystal

Osc.

V

CC

Limiter

Input

Decoupling

Limiter
Output

Quad

Input

RF
Input

9

10

11

12

13

14

15

161

4

5

6

7

8

Gnd
Audio

Mute
Scan

Control
Squelch

Input
Filter

Output
Filter

Input
Demodulator

Output

Mixer

Output

1

MOTOROLA ANALOG IC DEVICE DATA

    

. . . 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)

• Excellent Sensitivity: Input Limiting Voltage –

(– 3.0 dB) = 5.0 µV (Typical)

• Low Number of External Parts Required

• Recommend MC3372 for Replacement/Upgrade

Figure 1. Representative Block Diagram

10.7 MHz Input

Ground

Z2

Audio

Noise

Detector

Z1

Audio Mute

Scan Control

Active
Filter
Amp

_

2.0 V

+

455 kHz

Filter

10.245 MHz

V

CC

Quad

Coil

Demodulator

Limiter
Amp

16

14

15

13

12

11

10

9

8

7

6

5

4

3

2

1

Oscillator

Mixer

Squelch Trigger

With Hysteresis

 Motorola, Inc. 1996 Rev 5

MC3357

2

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS

(TA = 25°C, unless otherwise noted)

Rating

Pin Symbol Value Unit

Power Supply Voltage 4 VCC(max) 12 Vdc
Operating Supply Voltage Range 4 V

CC

4 to 8 Vdc
Detector Input Voltage 8 – 1.0 Vp–p
Input Voltage (VCC q 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, ∆f = ± 3.0 kHz, f

mod

= 1.0 kHz, TA = 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 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)

13 – 0 0.5 Vdc

Scan Function High (Mute On)

(V12 = Gnd)

13 5.0 – – Vdc

Mixer Conversion Gain 3 – 20 – dB
Mixer Input Resistance 16 – 3.3 – kΩ
Mixer Input Capacitance 16 – 2.2 – pF

MC3357

3

MOTOROLA ANALOG IC DEVICE DATA

Figure 2. Test Circuit

20 pF

120 pF

0.1 µF

VCC = 6.0 Vdc

10.245 MHz

50 pF

2.0 k

455 kHz

Filter

100 nF

2.0 k

51 k

100 nF

47 k

10 pF

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

Ω

muRata

CFU

455 D

8.2 k

390 k

1.0 k

1.0

µ

F

Filter In

Audio Out

100 nF

10 k

10 k

51

Input

10.7 MHz

9

10

11

12

13

14

15

16

4

3

2

1

0.01

µ

F

2.0 Vdc

Op Amp Output

5

6

7

8

+

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.

MC3357

4

MOTOROLA ANALOG IC DEVICE DATA

4

13

14

15

9

3.0 k

2

16

5

15 k

100 k

100 k

30 k

30 k

8

9

34

5.0 k 30 k

15 k

15 k

11

10

5

10 k 10 k 30 k 20 k

3

14 15

20 k

10

50 k

2221

20

19

18

16

17

50 k

12

11

22 k

23

24

25

26

220 k 15 k 10 k

50 k470

50 k

C

1

27

32

28

29

30

31

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

6.2 k 33 k 33 k 33 k 33 k

10 k

120 k

10

k

44

43

45 52

4948

46

50 51

53

54

55

5857

56

50 k

100 k

C

2

8

Figure 3. Circuit Schematic

MC3357

5

MOTOROLA ANALOG IC DEVICE DATA

OUTLINE DIMENSIONS

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.

–A–

B

F

C

S

H

G

D

J

L

M

16 PL

SEATING

18

916

K

PLANE

–T–

M

A

M

0.25 (0.010) T

DIM MIN MAX MIN MAX

MILLIMETERSINCHES

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

____

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.

18

16 9

SEATING

PLANE

F

J

M

R

X 45

_

G

8 PLP

–B–

–A–

M

0.25 (0.010) B

S

–T–

D

K

C

16 PL

S

B

M

0.25 (0.010) A

S

T

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

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

____

P SUFFIX

PLASTIC PACKAGE

CASE 648–08

ISSUE R

D SUFFIX

PLASTIC PACKAGE

CASE 751B–05

(SO–16)
ISSUE J

MC3357

6

MOTOROLA ANALOG IC DEVICE DATA

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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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MC3357/D

*MC3357/D*

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