Rapid Electronics MK484 Datasheet

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

§ Stable operation with 1.1V

§ Low Drain Current

§ Small and light weight (TO92 Package)

§ Wide AGC Ranging

Maximum Ratings

Item Symbol Rating Unit

Operating Temperature T

Storage Temperature T

Supply Voltage V

opr
stg

cc

-30 to +80 ºC

-40 to +125 ºC

1.5 V

Pin No. Symbol Description

1 Vss Gnd
2 I/P Input
3 O/P Output

484

1 2 3

Electrical Characteristics

Item Symbol Min Typ Max Unit

Supply Voltage V
Output Voltage V

Drain Current I
Cover Range

Input Resistance Z

Total Harmonic Distortion - - 4 - %

AGC Range A

Power Gain G

CC

OUT

CC

ƒ

R

IN

GC

P

VCC = 1.4V, R

Modulation 1,000Hz 40%, Vin = 1mV

(1) R

AGC

1.1 1.4 1.8 V

0.8 - 1.5 mV

- 0.3 - mA

150 - 3,000 KHz

- 4 -

30 - - dB

- 70 - dB

= 1.5KΩ, = 1,000K

AGC

Hz

(RMS)

= 100 – 1.5KΩ

MΩ

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

The enclosed information is believed to be correct, Information may change ‘without notice’ due to

product improvement. Users should ensure that the product is suitable for their use. E. & O. E.

Rapid Electronics Ltd, Severalls Lane, Colchester, Essex, England, CO4 5JS

Telephone [phone] Fax [phone] e-mail [e-mail]

Revision B

15/02/2001

Page 1 of 2

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