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AM Radio IC for DIY Enthusiasts

The document describes an MK484 radio IC that provides a complete RF amplifier, detection, and AGC circuit with only a few external components needed. It has a low supply voltage, drain current, and power consumption making it suitable for small, battery-powered devices like handheld radios. The IC operates from 150kHz to 3MHz with an input impedance of 4MΩ and output of 40-60mV.

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118 views2 pages

AM Radio IC for DIY Enthusiasts

The document describes an MK484 radio IC that provides a complete RF amplifier, detection, and AGC circuit with only a few external components needed. It has a low supply voltage, drain current, and power consumption making it suitable for small, battery-powered devices like handheld radios. The IC operates from 150kHz to 3MHz with an input impedance of 4MΩ and output of 40-60mV.

Uploaded by

Andres Gv
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Rapid Electronics Ltd DATA SHEET

MK484 RADIO IC
Description
The MK484 is a monolithic integrated circuit designed in a TO92 package for use as a one chip radio solution, high
sensitivity and high quality AM radio is possible with very few external components.

Special features of the circuit include low supply voltage operation, the
device is particularly suited to small hand-held radios.
MK
Features 484

§ Stable operation with 1.1V


§ Low Drain Current
§ Small and light weight (TO92 Package)
§ Wide AGC Ranging
1 2 3
Maximum Ratings
Pin No. Symbol Description
Item Symbol Rating Unit 1 Vss Gnd
Operating Temperature Topr -30 to +80 ºC 2 I/P Input
Storage Temperature Tstg -40 to +125 ºC 3 O/P Output
Supply Voltage Vcc 1.5 V

Electrical Characteristics

Item Symbol Min Typ Max Unit


Supply Voltage VCC 1.1 1.4 1.8 V
Output Voltage VOUT 0.8 - 1.5 mV
Drain Current ICC - 0.3 - mA
Cover Range ƒR 150 - 3,000 KHz
Input Resistance ZIN - 4 - MΩ
Total Harmonic Distortion - - 4 - %
AGC Range AGC 30 - - dB
Power Gain GP - 70 - dB
VCC = 1.4V, RAGC = 1.5KΩ, = 1,000KHz
Modulation 1,000Hz 40%, Vin = 1mV (RMS)
(1) RAGC = 100 – 1.5KΩ

Example Circuit

This circuit provides a complete RF amplifier, Detection and AGC circuit, which requires only a
few external components to give a high quality AM Tuner. Good audio quality can be achieved,
and current consumption is extremely low. No setting up or alignment is required and the circuit
is completely stable in use.

The MK484 has an input impedance of 4MΩ and operates over a frequency range of 150KHz to
3MHz. The IC will run off a DC supply of between 1.1V and 1.8V. A current drain of 0.3mA
makes it suitable for battery operation. The IC provides an output of 40 to 60 mV.

MK484 RADIO IC 82-1026 Revision B


The enclosed information is believed to be correct, Information may change ‘without notice’ due to 15/02/2001
product improvement. Users should ensure that the product is suitable for their use. E. & O. E. Page 1 of 2
Rapid Electronics Ltd, Severalls Lane, Colchester, Essex, England, CO4 5JS
Telephone 01206 751166 Fax 01206 751188 e-mail sales@rapidelec.co.uk
Cont’d..

126pF

The coil needs approximately 55 turns of 0.315mm diameter enamelled copper wire on a 100mm
long ferrite rod. A process of trial and error will help you achieve the optimum number of windings
on the ferrite rod.

In general the thicker the wire or larger the ferrite rod diameter the fewer the number of turns
required.

PCB Layout for the above circuit

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