Rapid Electronics Ltd
MK484 RADIO IC
Description
DATA SHEET
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.
Features
§
§
§
§
Stable operation with 1.1V
Low Drain Current
Small and light weight (TO92 Package)
Wide AGC Ranging
MK
484
1 2 3
Maximum Ratings
Item
Operating Temperature
Storage Temperature
Supply Voltage
Symbol
T
opr
T
stg
V
cc
Rating
-30 to +80
-40 to +125
1.5
Unit
ºC
ºC
V
Pin No.
Symbol
Description
1
2
3
Vss
I/P
O/P
Gnd
Input
Output
Electrical Characteristics
Item
Supply Voltage
Output Voltage
Drain Current
Cover Range
Input Resistance
Total Harmonic Distortion
AGC Range
Power Gain
Symbol
V
CC
V
OUT
I
CC
ƒ
R
Z
IN
-
A
GC
G
P
Min
1.1
0.8
-
150
-
-
30
-
Typ
1.4
-
0.3
-
4
4
-
70
Max
1.8
1.5
-
3,000
-
-
-
-
Unit
V
mV
mA
KHz
MΩ
%
dB
dB
V
CC
= 1.4V, R
AGC
= 1.5KΩ, = 1,000K
Hz
Modulation 1,000Hz 40%, Vin = 1mV
(RMS)
(1) R
AGC
= 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
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.
Revision B
15/02/2001
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..
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
嵌入式系统
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