Datasheet MC3359 Specification

    

T

70°C

...includes oscillator, mixer, limiting amplifier, AFC, quadrature
discriminator, op/amp, squelch, scan control, and mute switch. The MC3359
is designed to detect narrowband FM signals using a 455 kHz ceramic filter
for use in FM dual conversion communications equipment. The MC3359 is
similar to the MC3357 except that the MC3359 has an additional limiting IF
stage, an AFC output, and an opposite polarity Broadcast Detector. The
MC3359 also requires fewer external parts. For low cost applications
requiring VCC below 6.0 V, the MC3361BP,BD are recommended. For
applications requiring a fixed, tuned, ceramic quadrature resonator, use the
MC3357. For applications requiring dual conversion and RSSI, refer to these
devices; MC3335, MC3362 and MC3363.

• Low Drain Current: 3.6 mA (Typical) @ V

• Excellent Sensitivity: Input Limiting Voltage –

– 3.0 dB = 2.0 µV (Typical)

• Low Number of External Parts Required

• For Low Voltage and RSSI, use the MC3371

= 6.0 Vdc

CC

Order this document by MC3359/D



HIGH GAIN

LOW POWER

FM IF

SEMICONDUCTOR

TECHNICAL DATA

P SUFFIX

PLASTIC PACKAGE

CASE 707

DW SUFFIX

PLASTIC PACKAGE

CASE 751D

(SO–20L)

ORDERING INFORMATION

Operating

Device

MC3359DW
MC3359P

Temperature Range

–

= –30 to +

A

°

Figure 1. Simplified Application in a Scanner Receiver

V

= 6.0 Vdc

CC

10.245 MHz

68 pF

220 pF

Ceramic

Filter

Type
CFU
455 D

0.1 µF

0.1 µF

68 k

Quad

Coil

Toko
Type

7MC–8128Z

1

316

415

MC3359

514

613

712

8

910

100 pF

0.1

18

172

Mute

Scan Control

Squelch Input

Output

Inverting
Op Amp

(Filter)

11

Recovered Audio

µ

F

Input

51

390 k

Automatic
Frequency

Control

10.7 MHz
Input

0.001

µ

120 k

µ

F

0.1

0.001

µ

F

750

F

18 k

7.5 k

0.002

µ

F

1N4148

Figure 2.

68 k

+

.47

µ

F

0.01

µ

F

10 k

Package

SO–20L

Plastic DIP

VCC = 6.0 Vdc

51 k

50 k

Squelch

Sensitivity

Audio

Volume

0.01 µF

Audio

Out

Figure 2. Pin Connections and

Functional Block Diagram

1

Crystal

Osc.

Mixer

Output

V

CC

Limiter

Input

Decoupling

Decoupling

Quadrature

Input

Demodulator

Filter

Demodulator

2

3

1.8 k

4

514

6

7

8

9

NC

Crystal

Osc.

Mixer

Output

V

CC

Limiter

Input

Decoupling
Quadrature

Input

Filter

Oscillator

Limiter

1.8 k
52 k

50 k
10 pF

Demodulator

CASE 707

1

2

3

4

5

6

7Decoupling

8

9

CASE 751D

Mixer

Broadcast Detector

20

19

18

17

16

15

MC3359DW

14

13

12

1110

18

17

16

15

13

+

12

–

11

10

NC
RF

Input
Gnd
Audio

Mute
Scan

Control
Squelch

Input
Filter

Output
Filter

Input
Demod

Output
Recovered

Audio

RF
Input

Gnd

Audio
Mute

Scan
Control

Squelch
Input

Filter
Output

Filter
Input

Demod
Output

Recovered
Audio

 Motorola, Inc. 1996 Rev 3

MOTOROLA ANALOG IC DEVICE DATA

1

MC3359

g

µ

p

g

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
Input Voltage (VCCq

6.0 Volts) 18 V
Mute Function 16 V
Junction Temperature – T
Operating Ambient Temperature Range – T
Storage Temperature Range – T

ELECTRICAL CHARACTERISTICS (V

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

CC

CC

18
16

J

A

stg

6 to 9 Vdc

1.0 V

rms

– 0.7 to 12 V

150 °C

– 30 to + 70 °C

– 65 to + 150 °C

pk

= 1.0 kHz, 50 Ω source, TA = 25°C test circuit

mod

of Figure 3, unless otherwise noted)

Characteristics

Drain Current (Pins 4 and 8) Squelch Off

Squelch On

Min Typ Max Units

–
–

3.6

5.4

6.0

7.0
Input for 20 dB Quieting – 8.0 – µVrms
Input for – 3.0 dB Limiting – 2.0 – µVrms

Mixer Voltage Gain (Pin 18 to Pin 3, Open) – 46 –
Mixer Third Order Intercept, 50 Ω Input – – 1.0 – dBm

Mixer Input Resistance – 3.6 – kΩ
Mixer Input Capacitance – 2.2 – pF
Recovered Audio, Pin 10

450 700 – mVrms

(Input Signal 1.0 mVrms)
Detector Center Frequency Slope, Pin 10 – 0.3 – V/kHz
AFC Center Slope, Pin 11, Unloaded – 12 – V/kHz
Filter Gain (test circuit of Figure 3) 40 51 – dB
Squelch Threshold, Through 10K to Pin 14 – 0.62 – Vdc

Scan Control Current, Pin 15 Pin 14 – High

–

0.01

1.0 µA

Pin 14 – Low 2.0 2.4 –

mA

mA

Mute Switch Impedance

Pin 16 to Ground

Ceramic

Filter

muRata
CFU455D
or
Kyocera
KBF455P–20A

Lp = 1.0 mH
Cp = 120 pF

Ω

Rp = 100 k

Pin 14 – High

– 5.0

10 Ω

Pin 14 – Low 1.5 – MΩ

Figure 3. T est Circuit

V

CC

10.245 MHz

220 pF

0.1

µ

F

0.1

68 k

68
pF

µ

F

1

2

3

4

5

6

7

8

9

100 pF

0.1 µF

18

17

16

15

14

13

12

11

10

1.0 M

1.0

7.5 k

+

10 k

µ

51

2.4 k

I

1.0 k

F

0.002

Input

10.7 MHz

Audio Gen.

0.7 Vp–p

Squelch Input

Op Amp Output

Op Amp Input

AFC Output

Audio Output

µ

F

2

MOTOROLA ANALOG IC DEVICE DATA

MC3359

400

Input po = 10.7 MHz

p

Output

200

Output taken at

Pin 3 with filter

100

removed (open)

60

Ω

40

20

10

OUTPUT, 1.8 K [mVrms]

6.0

4.0

20
10

0

–10

Ω

–20
–30
–40

OUTPUT, 1.8 K [dBm]

–50
–60

–90 –80

Figure 4. Mixer V oltage Gain

0 = 455 kHz

INPUT, 50 Ω (mVrms)

VCC = 9.0 V

VCC = 6.0 V

Figure 6. Mixer Third Order

Intermodulation Performance

Output taken at

Pin 3 with filter
removed
VCC = 6.0 Vdc

Desired Products

3rd Order IM Products

–70 –60 –50 –40

INPUT, 50

Ω

[dBm]

–30

10

–20 –10

400.1 1.00.04

010

Figure 5. Limiting IF Frequency Response

0

– 10
– 20

Ω

– 30
– 40
– 50

RELATIVE OUTPUT [dB]

INPUT LEVEL, 50 [dBm]

– 60
– 70

Response Taken on

a special prototype.
Terminals not

available on
standard device.

100 µV

Figure 7. Detector and AFC Responses

8.0

7.0

6.0

5.0

4.0

3.0

2.0

1.0
0

– 10

IF Output

IF Input for –3 dB LImiting

FREQUENCY [MHz]

VCC = 6.0 Vdc

– 2.0– 4.0– 6.0– 8.0 4.0 6.0 8.0

RELATIVE FREQUENCY [kHz]

AFC Output Pin 11

Detector Output Pin 10

2.00

100101.00.1

10

Figure 8. Relative Mixer Gain Figure 9. Overall Gain, Noise, and AM Rejection

10

0

– 10

Derived using optimum L/C

– 20

oscillator values and holding
IF frequency at 455 kHz

– 30
– 40

RELATIVE GAIN [dB]

– 50
– 60

0.1 1.0
FREQUENCY [MHz]

10

MOTOROLA ANALOG IC DEVICE DATA

100

10

– 10
– 20
– 30
– 40

RELATIVE OUTPUT [dB] OUTPUT [Vdc]

– 50
– 60

0.001

0

0.1
INPUT [mVrms]

S+N±3 KHz FM

25

75

VCC = 6.0 Vdc

S + N (30% AM)

N

1.00.01

°

C

°

C

10010

3

MC3359

–10
–20

–30
–40

RELATIVE OUTPUT [dB]

–50
–60

10.706

10.704

10.702

10.700

10.698

10.696

FREQUENCY [MHz]

10.694

10.692

10.690

Figure 10. Output Components of Signal,

Noise, and Distortion

10

0

S + N + D

f
f

∆

Test circuit of
Figure 3.

N + D

N

INPUT [mVrms]

Figure 12. L/C Oscillator, Temperature and

Power Supply Sensitivity

VCC, SUPPLY VOLTAGE [Vdc]

5.8

20 30

5.9

6.0

5040

AMBIENT TEMPERATURE [

6.1 6.2

Temp

°

C]

o = 10.7 MHz
m = 1 kHz

f = "3.0 kHz

101.00.10.010.001

V

CC

60

100

70

Figure 11. Audio Output and Total Current

Drain versus Supply V oltage

8.0

7.0

6.0

Audio Output

5.0

4.0

3.0

2.0

SUPPLY CURRENT (mAdc)

1.0
0

ICC, Mute On

ICC, Mute Off

6.04.0

VCC, SUPPLY VOLTAGE (Vdc)

Figure 13. Op Amp Gain and Phase Response

70
60

50
40

30

GAIN [dB]

DOTTED CURVES TAKEN

20

WITH CIRCUIT VALUES

OF FIGURE 3.

10

VCC = 6.0 Vdc

0

1.0 K

Phase

10 K

FREQUENCY [Hz]

100 K 1.0 M 10 M

Gain

1.0 K

1.0

V

ref

USE CIRCUIT ABOVE
FOR OPEN LOOP GAIN
AND PHASE (SOLID LINES)

0.8

0.7

0.6

0.5

0.4

0.3

0.2

AUDIO OUTPUT (Vrms)

0.1
0

9.08.07.05.0

1.0 M

1.0 M

µ

F

0.1

13

12

180

150
120
90

PHASE [degrees]

60
30

0

1000

700

500
300
200

100

70
50

CAPACITANCE [pF]

30
20

10

5.0

4

Figure 14. L/C Oscillator Recommended

Component Values

V

CC

L

C

5

C

4

L

C

4

C

5

7.0 100
OSCILLA TOR FREQUENCY [MHz]

10

7.0

5.0

4.0

1

3.0

2

2.0

1.0

0.7

0.5

0.3

0.2

0.1

7050302010

1.0

0.8

µ

0.6

0.4

OUTPUT [Vrms]

INDUCT ANCE [ H]

0.2

0

Figure 15. The Op Amp as a Bandpass Filter

0.001

µ

GIVEN

f

= CENTER FREQUENCY

o

A(

f

) = GAIN AT CENTER FREQUENCY

o

Q

R3

+

p

foC1

R3

R1

+

2A(f

)

o
R1 R3

R2

+

2

R1*R3

4Q

V

0.17
Vrms

F

C1

C1

in

0.001

R1

R2

18 K

750

V

CC

R3

6.0 V

390 K

13

–

12

µ

F

+

V

ref

FREQUENCY [kHz]

MOTOROLA ANALOG IC DEVICE DATA

V

out

10050205.0 102.01.0

MC3359

Figure 16.

Q50

Q49

9

10

Q58

100 k

Q56

1.6 k

Q55

1.6 k

Q54

1.6 k

Q53

Q51

Q42Q41

Q52

33 k

1.6 k

Q57

Q44Q43

16

15

4

Q75

50 k

5k20 k

Q73

50 k 20 k

1413123

Q71

3.5 k

Q65

Q66

Q70

Q71

5k

Q67

Q76

Q68

Q69

50 k7 k 50 k 2.5 k

Broadcast Detector

Ω

750

Op Amp

100 k

1.6 k

1.6 k

1.6 k

1.6 k

1.6 k

Detector and AFC

1.6 k

11

Q59

Q47

Q46

Q45 Q48

Q40

Q60

1.8 k

10 k

Q64

100 k

Q15 Q16

20 k

Q7

Q63

Q11

Q12

Q13

Q61

Q14

Q62

15 k

33 k33 k3.5 k

Q37

Q39

10 pF

Q36

33 k 5 k

10

k

Q35

50 k

Q34

Q33

Q32

Q31

Q10

6pF 6pF

Figure 16. Representative Schematic Diagram

7k7k

3.6 k

Q9

Q3 Q4 Q5 Q6

Q8

Q2

5k

15 k

Q1

Q77

2

1

18

33 k33 k33 k

Oscillator – Mixer

Limiting IF Amplifier

Q17

Q22

Q18

Q30

Q29

Q28

Q27

Q26

Q25

6

Q24Q23

10 k 33k 33k 33 k 33 k 33 k 10k

1.8 k

Q20

Q19

100 k 10k 10 k 10 k 10 k 10 k 10 k 10 k 10 k 10 k 10k 10k 10 k

5

Q21

7

17

MOTOROLA ANALOG IC DEVICE DATA

5

MC3359

CIRCUIT DESCRIPTION

The MC3359 is a low–power FM IF circuit designed
primarily for use in voice–communication scanning receivers.
It is also finding a place in narrowband data links.

In the typical application (Figure 1), the mixer–oscillator
combination converts the input frequency (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 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.

APPLICATIONS INFORMATION

The oscillator is an internally biased Colpitts type with the
collector, base, and emitter connections at Pin 4, 1 and 2,
respectively. The crystal is used in fundamental mode,
calibrated for parallel resonance at 32 pF load capacitance.
In theory this means that the two capacitors in series should
be 32 pF, but in fact much larger values do not significantly
affect the oscillator frequency, and provide higher oscillator
output.

The oscillator can also be used in the conventional L/C
Colpitts configuration without loss of mixer conversion gain.
This oscillator is, of course, much more sensitive to voltage
and temperature as shown in Figure 12. Guidelines for
choosing L and C values are given in Figure 14.

The mixer is doubly balanced to reduce spurious
responses. The mixer measurements of Figure 4 and 6 were
made using an external 50 Ω source and the internal 1.8 k at
Pin 3. Voltage gain curves at several VCC voltages are shown
in Figure 4. The Third Order Intercept curves of Figure 6 are
shown using the conventional dBm scales. Measured power
gain (with the 50 Ω input) is approximately 18 dB but the
useful gain is much higher because the mixer input
impedance is over 3 kΩ. Most applications will use a 330 Ω

10.7 MHz crystal filter ahead of the mixer. For higher
frequencies, the relative mixer gain is given in Figure 8.

Following the mixer, a ceramic bandpass filter is
recommended. The 455 kHz types come in bandwidths from
±2 kHz to ± 15 kHz and have input and output impedances of

1.5 k to 2.0 k. For this reason, the Pin 5 input to the 6 stage
limiting IF has an internal 1.8 k resistor. The IF has a 3 dB

limiting sensitivity of approximately 100 µV at Pin 5 and a
useful frequency range of about 5 MHz as shown in Figure 5.
The frequency limitation is due to the high resistance values
in the IF, which were necessary to meet the low power
requirement. The output of the limiter is internally connected
to the quadrature detector, including the 10 pF quadrature
capacitor. Only a parallel L/C is needed externally from Pin 8
to VCC. A shunt resistance can be added to widen the peak
separation of the quadrature detector.

The detector output is amplified and buffered to the audio
output, Pin 10, which has an output impedance of
approximately 300 Ω. Pin 9 provides a high impedance (50 k)
point in the output amplifier for application of a filter or
de–emphasis capacitor. Pin 11 is the AFC output, with high
gain and high output impedance (1 M). If not needed, it
should be grounded, or it can be connected to Pin 9 to double
the recovered audio. The detector and AFC responses are
shown in Figure 7.

Overall performance of the MC3359 from mixer input to
audio output is shown in Figure 9 and 10. The MC3359 can
also be operated in “single conversion” equipment; i.e., the
mixer can be used as a 455 kHz amplifier. The oscillator is
disabled by connecting Pin 1 to Pin 2. In this mode, the
overall performance is identical to the 10.7 MHz results of
Figure 9.

A simple inverting op amp is provided with an output at
Pin 13 providing dc bias (externally) to the input at Pin 12,
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 either noise above
the normal audio, or a tone signal.

The open loop response of this op amp is given in
Figure13. Bandpass filter design information is provided in
Figure 15.

A low bias to Pin 14 sets up the squelch–trigger circuit so
that Pin 15 is high, a source of at least 2.0 mA, and the audio
mute (Pin 16) is open–circuit. If Pin 14 is raised to 0.7 V by
the noise or tone detector, Pin 15 becomes open circuit and
Pin 16 is internally short circuited to ground. There is no
hysteresis. Audio muting is accomplished by connecting Pin
16 to a high–impedance ground–reference point in the audio
path between Pin 10 and the audio amplifier. No dc voltage is
needed, in fact it is not desirable because audio “thump”
would result during the muting function. Signal swing greater
than 0.7 V below ground on Pin 16 should be avoided.

6

MOTOROLA ANALOG IC DEVICE DATA

MC3359

OUTLINE DIMENSIONS

P SUFFIX

PLASTIC PACKAGE

CASE 707–02

ISSUE C

18

10

B

1

9

A

C

K

N

F

D

H

G

SEATING
PLANE

L

M

J

NOTES:

1. POSITIONAL TOLERANCE OF LEADS (D),
SHALL BE WITHIN 0.25 (0.010) AT MAXIMUM
MATERIAL CONDITION, IN RELATION TO
SEATING PLANE AND EACH OTHER.

2. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.

3. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.

DIM MIN MAX MIN MAX

A 22.22 23.24 0.875 0.915
B 6.10 6.60 0.240 0.260
C 3.56 4.57 0.140 0.180
D 0.36 0.56 0.014 0.022
F 1.27 1.78 0.050 0.070

G 2.54 BSC 0.100 BSC

H 1.02 1.52 0.040 0.060
J 0.20 0.30 0.008 0.012
K 2.92 3.43 0.115 0.135
L 7.62 BSC 0.300 BSC

M 0 15 0 15

__ __

N 0.51 1.02 0.020 0.040

INCHESMILLIMETERS

DW SUFFIX

PLASTIC PACKAGE

CASE 751D–04

(SO–20L)

J

M

F

ISSUE E

M

B

M

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 0.150
(0.006) PER SIDE.

5. DIMENSION D DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.13
(0.005) TOTAL IN EXCESS OF D DIMENSION
AT MAXIMUM MATERIAL CONDITION.

DIM MIN MAX MIN MAX

A 12.65 12.95 0.499 0.510
B 7.40 7.60 0.292 0.299
C 2.35 2.65 0.093 0.104
D 0.35 0.49 0.014 0.019
F 0.50 0.90 0.020 0.035

R

X 45

_

G 1.27 BSC 0.050 BSC
J 0.25 0.32 0.010 0.012
K 0.10 0.25 0.004 0.009
M 0 7 0 7

__

P 10.05 10.55 0.395 0.415
R 0.25 0.75 0.010 0.029

INCHESMILLIMETERS

__

–A–

20

11

–B–

P10X

0.010 (0.25)

1

10

D20X

S

M

0.010 (0.25) B

A

T

S

C

SEATING

–T–

18X

G

K

PLANE

MOTOROLA ANALOG IC DEVICE DATA

7

MC3359

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. “T ypical” 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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and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
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
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Opportunity/Affirmative Action Employer.

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8

◊

MOTOROLA ANALOG IC DEVICE DATA

MC3359/D

*MC3359/D*