MK484 RECTRON | Alldatasheet
Document overview
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Technical content
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 opr -30 to +80 ºC Storage Temperature T stg -40 to +125 ºC Supply Voltage V cc 1.5 V
Electrical Characteristics
Item Symbol Min Typ Max Unit Supply Voltage V CC 1.1 1.4 1.8 V Output Voltage V OUT 0.8 - 1.5 mV Drain Current ICC - 0.3 - mA Cover Range ƒR 150 - 3,000 KHz Input Resistance Z IN - 4 - M Ω Total Harmonic Distortion - - 4 - % AGC Range A GC 30 - - dB Power Gain G P - 70 - dB V CC = 1.4V, R AGC = 1.5K Ω , = 1,000K Hz Modulation 1,000Hz 40%, Vin = 1mV (RMS) (1) R AGC = 100 – 1.5K Ω 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 4M Ω and operates over a frequency range of 150KHz to makes it suitable for battery operation. The IC provides an output of 40 to 60 mV. 15/02/2001 The enclosed information is believed to be correct, Information may change ‘without notice’ due to Rapid Electronics Ltd , Severalls Lane , Colchester, Essex, England, CO4 5JS Telephone 01206 751166 Fax 01206 751188 e-mail sales@rapidelec.co.uk MK 484 1 2 3 Pin No. Symbol Description
1 Vss Gnd
2 I/P Input
3 O/P Output
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