QwikRadio

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13

October1999

MICRF003

MICRF003

Micrel

Typical Application

Figure 7 below illustrates a typical application for the MICRF003 UHF Receiver IC. Operation in this example is at 915MHz,

and may be customized by selection of the appropriate reference frequency (CR1), and adjustment of the antenna length.

The value of C4 would also change, if the optional input filter is used. Changes from the 1kbps data rate may require a

change in the value of R1. The Bill of Materials is shown in the accompanying chart.

Bill of Materials

Item

Part Number

Manufacturer

Description

U1

MICRF003

Micrel

UHF Receiver

U2

HT-12D

Holtek

Logic decoder

CR1

CSA7.12MG

Murata

7.12MHz Cer. Res.

D1

SSF-LX100LID

Lumex

RED LED

R1

Bourns

68k, 1/4W ,5%

R2

Bourns

1k,1/4W, 5%

C1

Panasonic

4.7µF, Dip Tant. Cap

C3

Panasonic

0.47µF, Dip Tant. Cap

C2

Panasonic

2.2µF, Dip Tant. Cap

C4

Panasonic

3.0 pF, COG Cer. Cap

Vendor

Telephone

Fax

Bourns

(909) 781-5500

(909) 781-5273

Holtek

(408) 894-9046

(408) 894-0838

Lumex

(800) 278-5666

(847) 359-8904

Murata

(800) 241-6574

(770) 436-3030

Panasonic

(201) 348-7000

(201) 348-8164

Figure 7

915MHz, 1kbps OOK Receiver/Decoder

SWP Mode, Continuous Operation

6-Bit Address Decode/2 OP Codes