MICRF004BM データシートの表示（PDF） - Micrel

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MICRF004BM

QwikRadio™ Low-Power VHF Receiver

Micrel 

MICRF004/RF044

150MHz Receiver/Decoder Application

Figure 7a illustrates a typical application for the MICRF004

VHF Receiver IC. This receiver operates continuously (not

duty cycled) in sweep mode, and features 6-bit address

decoding and two output code bits.

Micrel

Operation in this example is at 150MHz, and may be custom-

ized by selection of the appropriate frequency reference

(CR1), and adjustment of the antenna length. The value of C4

would also change if the optional input filter is used. Changes

from the 1kb/s data rate may require a change in the value of

R1. A bill of materials accompanies the schematic.

+5V

Supply

Input

Optional Filter

33pf, 33nH

C4

L1

C1

4.7µF

C2

2.2µF

RF Baseband

(Analog) (Digital)

Ground Ground

U1 MICRF004

4.85MHz

SSEELL00

SWEN (ceramic resonator)

VSSRF REFOSC

VSSRF

SEL1

ANT

CAGC

VDDRF WAKEB

0.47µF

VDDBB

SHUT

CTH

DO

NC

VSSBB

U2 HT-12D

A0

VDD R2

A1

VT

1k

A2 OSC1 R1

A3 OSC2

68k

A4

DIN

A5

D11

A6

D10

A7

D9

VSS D8

Figure 7a. 150MHz, 1kb/s On-Off Keyed Receiver/Decoder

Code Bit 0

Code Bit 1

Item

U1

U2

CR1

D1

R1

R2

C1

C3

C2

C4

Part Number

MICRF004

HT-12D

CSA4.65MG

SSF-LX100LID

Manufacturer

Micrel

Holtek

Murata

Lumex

Bourns

Panasonic

Panasonic

Panasonic

Panasonic

Description

UHF receiver

logic decoder

4.65MHz ceramic resonator

red LED

68k 1/4W 5%

1k 1/4W 5%

4.7µF dipped tantalum capacitor

0.47µF dipped tantalum capacitor

2.2µF dipped tantalum capacitor

8.2pF COG ceramic capacitor

Figure 7b. Bill of Material

Vendor

Bourns

Holtek

Lumex

Murata

Panasonic

Telephone

(909) 781-5500

(408) 894-9046

(800) 278-5666

(800) 241-6574

(201) 348-7000

FAX

(909) 781-5273

(408) 894-0838

(847) 359-8904

(770) 436-3030

(201) 348-8164

Figure 7c. Component Vendors

February 9, 2000

13

MICRF004/RF044

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