Motorola MC3356DW, MC3356P Datasheet

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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

• 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

Order this document by MC3356/D



WIDEBAND

FSK

RECEIVER

SEMICONDUCTOR

TECHNICAL DATA

P SUFFIX

PLASTIC PACKAGE

CASE 738

Ceramic

Filter

Figure 1. Representative Block Diagram

Ground

OSC

Mixer

Comparator

Meter Current

Limiter

Data Shaping

Comparator

+ –

– +

Buffer

Input

Ground

Data

Output

Squelch

Status

Hysteresis

Squelch

Adjust

(Meter)

DW SUFFIX

PLASTIC PACKAGE

CASE 751D

(SO–20L)

PIN CONNECTIONS

RF Ground

IF V

OSC Emitter

OSC Collector

RF V

Mixer Output

Limiter Input

Limiter Bias

Quad Bias

201

RF Input

Ground

Data Output

+ Comparator

– Comparator

Squelch Status

Squelch Control

Buffered Output

Demodulator

Filter

Quad Input

Quadrature Detector

MOTOROLA ANALOG IC DEVICE DATA

Tank

ORDERING INFORMATION

Operating

Device

MC3356DW MC3356P

 Motorola, Inc. 1996 Rev 0

Temperature Range

TA = – 40 to +85°C

Package

SO–20L

Plastic DIP

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Voltage V Operating Power Supply Voltage Range (Pins 6, 10) V Operating RF Supply Voltage Range (Pin 4) RF V Junction Temperature T Operating Ambient Temperature Range T Storage Temperature Range T Power Dissipation, Package Rating P

MC3356

CC(max)

stg

15 Vdc

3.0 to 9.0 Vdc

3.0 to 12.0 Vdc 150 °C

– 40 to + 85 °C

– 65 to + 150 °C

1.25 W

ELECTRICAL CHARACTERISTICS (V

= 5.0 Vdc, fo = 100 MHz, f

= 110.7 MHz, ∆f = ±75 kHz, f

osc

= 1.0 kHz, 50 Ω source,

mod

TA = 25°C, test circuit of Figure 2, unless otherwise noted.)

Characteristics

Drain Current Total, RF VCC and V

Min Typ Max Unit

– 20 25 mAdc

Input for – 3 dB limiting – 30 – µVrms

Input for 50 dB quieting

S + N

()

– 60 – µVrms

Mixer Voltage Gain, Pin 20 to Pin 5 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

NOTE: 1. Not taken in Test Circuit of Figure 2; new component values required.

Figure 2. T est Circuit

Data Output

Squelch

Status

Demod

Out

100 MHz 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

5 Vdc

130 k 3.3 k

3.0 k

3.3 k

Status

T1V

Squelch

Control

Limiter

Input

0.1

330

470

Demod

Out

Limiter

Bias

0.01

18 k

Demod

Filter

Limiter

Bias

0.01

18 k

Quad Input

Quad

Bias

47 k

10 k

0.01

51 20 19 18 17 16 15 14 13 12 11

RF Input Ground Data

OSC

Gnd

EM.

5.6 pF

15 pF

390 k

Output

OSC COL.RFV

0.01

Comp(+) Comp(–) Squelch

Mixer

Out

0.01

330

MOTOROLA ANALOG IC DEVICE DATA

150 pF

10987654321

Figure 3. Output Components of Signal,

Noise, and Distortion

0 –10 –20

S + N + D

fO = 100 MHz

fm = 1.0 kHz

∆

f = ± 75 kHz

MC3356

Figure 4. Meter Current versus Signal Input

700 600

500

400 –30 –40

RELATIVE OUTPUT (dB)

–50 –60

0.01 0.1 1.0 10

N + D

INPUT (mVrms)

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

300 200 100

METER CURRENT, PIN 14 ( A)

0.010 0.1 1.0 10 100 1000 PIN 20 INPUT (mVrms)

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.

MOTOROLA ANALOG IC DEVICE DATA

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