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Device

Operating

Temperature Range

Package

MC13030

SEMICONDUCTOR

TECHNICAL DATA

DUAL CONVERSION

AM RECEIVER

ORDERING INFORMATION

MC13030DW

TA = –40

to +85

SOIC–28

DW SUFFIX

PLASTIC PACKAGE

CASE 751F

(Top View)

PIN CONNECTIONS

Order this document by MC13030/D

Mix1 In

RF Gnd

FET RF AGC

RF AGC2

RF AGC Adj

Mix1 RF AGC Adj

SD Level

IF Gnd

SD IF Out

S Level Out

IF AGC In

AF Out

VCC

VCO Out

VCO

VCO Ref

Mix1 Out

Vref

Mix2 In

Mix2 Out

Xtal Osc E

Xtal Osc B

IF In

Det Vref

Det In

MOTOROLA ANALOG IC DEVICE DATA

Advance Information

Dual Conversion

AM Receiver

The MC13030 is a dual conversion AM receiver designed for car radio

applications. It includes a high dynamic range first mixer, local oscillator,

second mixer and second oscillator, and a high gain AGC’d IF and

detector. Also included is a signal strength output, two delayed RF AGC

outputs for a cascode FET/bipolar RF amplifier and diode attenuator, a

buffered IF output stage and a first local oscillator output buffer for driving

a synthesizer. Frequency range of the first mixer and oscillator is 100 kHz

to 50 MHz.

Applications include single band and multi–band car radio receivers, and

shortwave receivers.

•

Operation from 7.5 to 9.0 Vdc

•

First Mixer, 3rd Order Intercept = 20 dBm

•

Buffered First Oscillator Output

•

Second Mixer, 3rd Order Intercept = +5.0 dBm

•

No Internal Beats Between 1st and 2nd Oscillator Harmonics

•

Signal Strength Output

•

Limited 2nd IF Output for Frequency Counter Station Detector

•

Adjustable IF Output Station Detector Level

•

Adjustable RF AGC Threshold for Both Mixer Inputs

•

Two Delayed AGC Outputs for Cascode RF Stage and Diode Attenuator

Representative Block Diagram

This device contains 335 active transistors.

VCC

VCO

5.1 V

6.5 V

Mix1

Mix2

XTal

Osc

4.1 V

3.0 mA

IF Amp

AGC

6.6 mA

Motorola, Inc. 1996

Rev 1

MC13030

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS

(TA = 25

C, unless otherwise noted.)

Rating

Symbol

Value

Unit

Power Supply

VCC

Operating Temperature

–40 to +85

Storage Temperature

Tstg

–65 to +150

Junction Temperature

150

NOTE: ESD data available upon request.

ELECTRICAL CHARACTERISTICS

(TA = 25

C, VCC = 8.0 V, unless otherwise noted.)

Characteristic

Condition/Pin

Symbol

Min

Typ

Max

Unit

Power Supply Voltage

–

VCC

7.5

8.0

9.0

Power Supply Current

VCC = 8.0 V

ICC

Detector Output Level

Vin = 1.0 mV, 30% Mod.

V13

160

200

240

mVrms

Audio S/N Ratio

Vin = 1.0 mV, 30% Mod.

S/N

–

Audio THD

Vin = 1.0 mV, 30% Mod.

1 0

V 80% M d

THD

–

0.3

0 3

1.0

1 0

Vin = 1.0 mV, 80% Mod.

2 0

V 80% M d

–

0.3

0 4

1.0

1 5

Vin = 2.0 mV, 80% Mod.

–

0.4

1.5

Signal Strength Output

Vin = 0 to 2.0 V

V11

–

5.2

VCO Buffer Output

–

V28

178

224

282

SD Output Level

Vin = 1.0 mV, V11 > V8

V10

2.3

2.7

3.3

Vpp

MIXER1

Input Resistance

1 or 2 to Gnd

–

Ω

Third Order Intercept Point

1 or 2

IP3

–

127

–

Conversion Transconductance

1 or 2 to 24 + 25

–

2.2

–

Total Collector Current

24 + 25

–

4.6

–

Input IF Rejection

1 or 2

–

MIXER2

Input Resistance

–

2.4

–

Ω

Third Order Intercept Point

IP3

–

112

–

Conversion Transconductance

22 to 20 + 21

–

4.6

–

Total Collector Current

20 + 21

–

3.0

–

VCO

Minimum Oscillator Coil Parallel Impedance

27 to 26

–

3.0

–

Ω

Buffer Output Level

–

224

–

mVrms

Stray Capacitance

–

7.0

–

IF AMPLIFIER

Input Resistance

Rin

–

2.0

–

Ω

Transconductance

17 to 15

–

Maximum Input Level

Vin

–

125

–

mVrms

Minimum Detector Coil Parallel Impedance

17 to 15

–

Ω

RF Output Level

15, Vin = 1.0 mV

–

2.0

–

Vpp

Audio Output Impedance

Rout

–

120

–

Ω

Audio Output Level

13 @ 30% Mod.

Vout

–

200

–

mVrms

MC13030

MOTOROLA ANALOG IC DEVICE DATA

NOTES: 1. The transformers used for at the output of the mixers are wideband 1:4 impedance ratio. The secondary load is the 50

Ω

input of the spectrum

analyzer, so the impedance across the collectors of the mixer output is 200

Ω

2. Since the VCO frequency is not critical for this measurement, a fixed tuned oscillator tuned to 11.7 MHz is used. This gives an input frequency

of 1.0 MHz.

3. The detector coil is loaded with a 10 k resistor to reduce the tuned circuit Q and to present a 10 k

Ω

load to the IF output for determination of IF

transconductance.

4. The RF AGC current, S output current and Pin 6 current are measured by connecting a current measuring meter to these pins, so they are effectively

shorted to ground.

5. SD adjust is adjusted by connecting a power supply or potentiometer and voltmeter to Pin 8.

Figure 1. Test Circuit

VCO

Out

VCO

Ref

Mix1

Out

Mix1

Out

Vref

Mix2

Out

Mix2

Out

Xtal

Osc E

Xtal

Osc B

IF In

Det

Vref

Det

Mix1

Gnd

FET

AGC

AGC2

AGC

Adj

Mix1

RF AGC

Adj

Level

Gnd

SD IF

Out

S Level

Out

AGC In

Out

VCC

Mixer1 Out

Mixer2 Out

8.0 V

Mixer2 In

Osc Out

Mixer1 Input

FO = 1.0 MHz

FET RF AGC Voltage

RF AGC Current

Pin 6 Current

SD Adjust

IF Signal Out

S Output Current

Audio Out

IF Output/

Det Input

Input

Adj to 11.7 MHz

2.2

82 pF

680

8.0 V

10 k

0.1

10.245

0.1

1.0

0.1

0.01

1:4

10 k

180 pF

0.1

4.7

FUNCTIONAL DESCRIPTION

The MC13030 contains all the necessary active circuits for

an AM car radio or shortwave receiver.

The first mixer is a multiplier with emitter resistors in the

lower, signal input transistors to give a high dynamic range. It

is internally connected to the first oscillator (VCO). The input

pins are 1 and 2. The input can be to either Pins 1 or 2, or

balanced. These pins are internally biased, so a dc path

between them is allowable but not necessary. The mixer

outputs are open collectors on Pins 25 and 26. They are

normally connected to a tuned transformer.

The first oscillator on Pin 27 is a negative resistance type

with automatic level control. The level is low so the signal

does not modulate the tuning diode capacitance and cause

distortion. Pin 26 is the reference voltage for the oscillator

coil. This reference is also the supply for the mixer circuits.

The upper bases of the mixer are 0.7 V below this reference.

The second mixer is similar to the first, but it is single–

ended input on Pin 22. Its outputs are open collectors on

Pins 20 and 21 which are connected to a tuned transformer.

The dynamic range of this mixer is less than the first. It is also

connected internally to an oscillator which is normally crystal

controlled. The oscillator is a standard Colpitts type with the

emitter on Pin 19 and the base on Pin 18.

The IF amplifier input is Pin 17. The AGC operates on the

input stage to obtain maximum dynamic range and minimum

distortion. The IF output, Pin 15, is a current source.

MC13030

MOTOROLA ANALOG IC DEVICE DATA

Therefore, its gain is determined by the load impedance

connected between Pins 15 and 16. Pin 16 is a voltage

reference for the output. The output is internally connected to

the AM detector, and Pin 13 is the detector output. This

detector also provides the AGC signal for the IF amplifier. An

RC filter from Pin 13 to 12 removes the audio, leaving a dc

level proportional to the carrier level for AGC.

Pin 11 provides a current proportional to signal strength.

It is a current source so a resistor must be connected from

Pin 11 to ground to select the desired dc voltage range. The

current is proportional to the signal level at Pin 17, the IF

amplifier input.

A high–gain limiting amplifier is used to derive the station

detect (SD) signal output on Pin 10; this output is present only if

it is turned on by the voltage on Pin 8. If the voltage on

Pin 8 is less than the voltage on Pin 11, the output on Pin 10 is

“on”. The station detector IF output on Pin 10 is used with

synthesizers which have a frequency counting signal detector.

The RF AGC outputs on Pins 4 and 5 are controlled by the

signal levels at Mixer1 or Mixer2. Bypass capacitors are

required on Pins 6 and 4 to remove audio signals from the

AGC outputs. Pin 4 is designed to control the NPN transistor

in series with the RF amplifier FET. The voltage on Pin 4 is

5.1 V with no input signal and decreases with increasing input

signal. Pin 5 is designed to control an additional AGC circuit

at the antenna input. The voltage on Pin 5 is at 0 V with no

input signal and increases with increasing input signals. The

voltage on Pin 5 does not increase until the voltage on Pin 4

has decreased to about 1.3 V. In most cases, Pin 5 is used to

drive a diode shunt. Maximum output current is about 850

The RF AGC sensitivity is about 40 mVrms input to Mixer1

or about 2.0 mVrms input to Mixer2 at 1.0 MHz. The AGC

sensitivity for both mixers can be decreased by adding a

resistor from Pin 6 to ground. There is also an additional

amplifier between Mixer1 and its AGC rectifier. The gain of

this amplifier and AGC sensitivity for Mixer1 can be increased

by adding a resistor from Pin 7 to ground. Therefore, the

desired AGC sensitivity for both mixers can be achieved by

changing the resistors on Pins 6 and 7.

Mix1 In

RF Gnd

FET RF AGC

RF AGC2

RF AGC Adj

Mix1 RF AGC Adj

SD Level

IF Gnd

SD IF Out

S Level Out

IF AGC In

AF Out

VCC

VCO Out

VCO

VCO Ref

Mix1 Out

Vref

Mix2 In

Mix2 Out

Xtal Osc E

Xtal Osc B

IF In

Det Vref

Det In

Figure 2. Pin Connections and DC Voltages

5.1 V

7.8 V

6.5 V

3.7 V

7.9 V

4.4 V

5.0 V

4.8 V

4.1 V

3.3 V

0 V

5.1 to 0 V

0 to 850

0 to 2.8 V

200 mV

43 mV

0 to 4.8 V

0 V

6.5 V

0 to 4.8 V

3.6 to 4.5 V

8.0 V

S Out versus IF Input:

The S output current at Pin 11 is provided by two

collectors, one a PNP source and the other a sink to ground.

The desired S output voltage can be selected using the curve

of Figure 3 and calculating the value of the required resistor.

Figure 3. S Output Current versus IF Input Level

IF INPUT LEVEL (dB

100

CURRENT

(

RF FET AGC versus Mixer1 and Mixer2 Input Level:

Figures 4 and 5 are generated with no external resistance

on Pins 4 or 6, so they represent the minimum RF AGC

sensitivity of Mixer1 and Mixer2.

Figure 4. RF AGC Voltage versus Mixer1 Input

100

105

1.0

2.0

3.0

4.0

5.0

MIXER1 INPUT LEVEL (dB

PIN 4 VOL

TAGE

(V)

Figure 5. RF AGC Voltage versus Mixer2 Input

MIXER2 INPUT LEVEL (dB

1.0

2.0

3.0

4.0

5.0

PIN 4 VOL

TAGE

(V)

MC13030

MOTOROLA ANALOG IC DEVICE DATA

Pin 6 Current versus Mixer1 and Mixer2 Input Level:

The internal resistance from Pin 6 to ground is 39 k.

The RF AGC voltage on Pin 4 is 2.0 V when the voltage on

Pin 6 is 1.2 V. Therefore, the desired AGC thresholds for

either mixer can be set with these curves. The design steps

are described in the design notes.

Figure 6. Pin 6 Current versus Mixer1 Input Level

MIXER1 INPUT LEVEL (dB

100

110

120

100

150

200

250

CURRENT

(

CURRENT

(

Figure 7. Pin 6 Current versus Mixer2 Input Level

MIXER2 INPUT LEVEL (dB

120

100

150

200

100

110

250

Mixer1 AGC Gain Increase versus R7:

Adding a resistor from Pin 7 to ground increases the AGC

sensitivity of Mixer1. The range of increase in dB can be

found from this curve. This is useful after setting up the AGC

threshold of Mixer2.

Figure 8. Mixer1 AGC Gain Increase versus R7

100

10 k

5.0

6.0

7.0

8.0

INCREASE IN MIXER1

AGC SENSITIVITY

(dB)

1.0 k

1.0

2.0

3.0

4.0

Pin 5 Current versus Pin 4 Voltage:

All the curves give Pin 4 AGC voltage versus some other

input level. This curve can be used to determine the auxiliary

AGC current from Pin 5 at a given Pin 4 voltage.

Figure 9. Pin 5 Current versus Pin 4 Voltage

PIN 5 CURRENT (mA)

0.4

0.8

1.2

1.0

2.0

3.0

4.0

5.0

PIN 4 VOL

TAGE

MC13030

MOTOROLA ANALOG IC DEVICE DATA

PIN FUNCTION DESCRIPTION

Pin No.

Internal Equivalent Circuit

Description

1, 2

10 k

3.3 V

6.6 mA

150

Mixer1 Input

Pins 1 and 2 are equivalent. In the application circuit, 2 is grounded

with a capacitor and 1 is the input. If a load resistor is needed for the

input filter, it can be placed across Pins 1 and 2. Input impedance for

each pin is 10 k. IP3 (third order intercept) at the input is 20 dBm

(127 dB

). To guarantee –50 dB IM3, the input level should not be

greater than 3.5 dBm (103 dB

) (150 mVrms).

RF Ground

This should be connected to the ground used for the RF circuits.

10 k

5.1 V

4.0 V

3.4 k

FET RF AGC Output

This is the AGC for the cascode transistor connected to the RF amplifier

FET. The no–signal voltage is 5.1 V. The voltage decreases with

increasing input signals. A bypass capacitor and electrolytic capacitor

must be added to filter out RF signals on the transistor and audio signals

in the AGC signal. See Figures 4 and 5.

100

22 k

VCC

330

RF AGC2 Output

The voltage on this pin starts at 0 and increases with increasing input

signals. It is normally used to turn on diodes or a transistor connected

across the antenna input and is AGC delayed until Pin 6 reaches 2.7 V.

If the voltage on Pin 5 decreases below 2.0 V, the voltage on this pin will

decrease from 3.1 down to about 1.5 V. The maximum output current is

about 850

330

AGC

1.0 k

39 k

3.3 k

RF AGC Adjust

An electrolytic capacitor of 1.0

F must be connected to prevent audio

modulation of the AGC circuits. If there is no resistor on this pin, the RF

AGC starts at an input level to Mixer1

≈

40 mVrms or Mixer2

≈

2.0 mVrms.

Connecting a resistor from Pin 6 to ground increases RF levels required

for AGC to start. It should be used to set the desired AGC level of Mixer2.

If a resistor is not connected to Pin 6, unwanted RF signals will cause the

AGC to start at a very low level, and desired signals may be suppressed.

500

1.5 k

Mixer1 RF Level Adjust

A resistor from Pin 7 to ground will increase the gain of an amplifier from

the input of Mixer1 to the AGC circuit. It can be used to set the RF AGC

level of Mixer1. The minimum value of R7 is about 680

Ω

510

3.3 k

Station Detector Signal Level Adjust

A voltage on Pin 8 will set the desired signal strength at which the SD IF

Out on Pin 10 appears. The other input to this comparator is the S (signal

strength) signal. If Pin 8 is grounded, a square wave of the 2nd IF (usually

450 of 455 kHz) is present with very small input levels. This output could

also be used to drive an FM detector if desired.

IF Ground

Pin 9 is the ground for the IF section.

MC13030

MOTOROLA ANALOG IC DEVICE DATA

PIN FUNCTION DESCRIPTION (continued)

Pin No.

Description

Internal Equivalent Circuit

10 k

510

Station Detector IF Output

This output is “on” when V11 > V8. The output is an amplified and limited

2nd IF signal. The signal level is

≈

250 mVpp when it is 100% “on”.

510

1.0 k

VCC

S Level Output

This is a dc current proportional to IF input level. With a load resistor of

75 k, the dc voltage is 0 to 5.1 V.

1.0 k

VCC

IF AGC In

The IF gain is controlled by the dc voltage on this pin. It is normally

connected to Pin 13 through an RC network to filter out the audio signal

on Pin 13. The IF gain is maximum when V13

≈

3.6 V. When V13

increases, the IF gain decreases.

100

VCC

Audio Output

The dc voltage on Pin 13 is

≈

3.6 V with no input signal and increases to

≈

4.5 V at minimum IF gain. A nonpolarized electrolytic capacitor may be

required to couple to the audio circuits if the audio amplifier dc bias

voltage is between these voltages.

VCC

Supply Voltage

The nominal operating voltage is 8.0 V.

510

IF Amplifier Output and Detector Input

The detector coil must be connected between Pin 15 and 16. The IF

amplifier output is a current source, the IF amplifier is a transconductance

amplifier; the gain is determined by the impedance between Pins 15 and

16. The IF amplifier gm

≈

0.028 mho. If a wide bandwidth IF is desired, the

detector coil can be connected between Pins 15 and 16 without a tap and

then loaded with a resistor across the coil.

1.0 k

510

Detector Reference Voltage

One side of the detector coil is connected to this pin. It should be

bypassed with a 0.1

F capacitor.

MC13030

MOTOROLA ANALOG IC DEVICE DATA

PIN FUNCTION DESCRIPTION (continued)

Pin No.

Description

Internal Equivalent Circuit

2.0 k

4.8 V

To SD

Circuit

IF Input

The IF input impedance is 2.0 k to match most ceramic 455 or 450 kHz

filters. For a ceramic filter requiring a 1.5 k load, a 5.6 k resistor in

series with a 0.01

F capacitor should be connected from Pin 17 to

ground.

5.1 k

500

Crystal Oscillator Base

The crystal oscillator is a simple Colpitts type, operating at a low

current. The crystal should operate at 10.250 MHz for 450 kHz IF or

10.245 MHz for 455 kHz IF with a 20 pF load capacitance. The

oscillator signal to the second mixer is coupled from Pin 18 through an

emitter follower. If a synthesizer such as the Motorola MC145170 with

a 15 bit programmable R counter is used, the 10.245 MHz crystal can

be connected to the synthesizer, and a 200 mVpp oscillator signal

from the synthesizer can be capacitively coupled to Pin 18, so only

one crystal is needed.

Crystal Oscillator Emitter

The capacitive divider from Pin 18 is connected as shown in the

application circuits of Figures 10, 11, 12.

20, 21

5 1 V

Mixer2 Output

The maximum AC collector voltage is about 5.8 Vpp or 2.0 Vrms. The

mixer conversion transconductance gc = 0.0046 mho. The load

impedance should be selected so the mixer output does not overload

before the input.

5.1 V

To AGC

Circuit

2.4 k

3.0 mA

3.7 V

Mixer2 Input

The input impedance is 2.4 k. A series R–C network from Pin 22 to

ground or a resistor from the filter to Pin 22 can be used to properly

match the filter. In most cases, a 10.7 MHz crystal filter can be connected

to Pin 22 directly without any additional components. IP3 (third order

intercept) at the input is 5.0 dBm (112 dB

). To guarantee –50 dB IM3, the

input level should not be greater than –20 dBm (87 dB

) (22.7 mVrms).

6.5 V

Vref

Vref

This is the main reference voltage for most of the circuits in the IC and

should be bypassed with a 1.0

F capacitor.

24, 25

VCO

5.1 V

Mixer1 Output

The maximum collector voltage is about 5.8 Vpp or 2.0 Vrms. The mixer

conversion transconductance gc = 0.0022. The load impedance should

be selected so the mixer output does not overload before the inpu