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MICRF405

290MHz – 980MHz ISM Band

ASK / FSK Transmitter

General Description

The MICRF405 is a 290MHz-980MHz RF transmitter

IC designed for unlicensed ISM band operations. It's

designed to work in the North American 315MHz

and 915MHz bands as well as the European

433MHz and 868MHz bands. The device is fully

FCC Part 15.247 and EN300-220-compliant.

The transmitter consists of a FSK/ASK modulator,

PLL frequency synthesizer and a power amplifier.

The frequency synthesizer consists of a voltage-

controlled oscillator (VCO), a crystal oscillator, dual

modulus prescaler, programmable frequency

dividers and a phase-detector. The loop-filter can be

internal or external. The output power of the power

amplifier can be programmed to eight levels. A lock

detect circuit detects when the PLL is in lock.

In FSK mode, the user can select between three

different modulation types allowing a data rate up to

200kbps. When selecting FSK modulation applied

with dividers, the MICRF405 is switching between to

sets of register values (M0,N0,A0:"0" and M1,N1

and A1:"1"). The second modulation type is closed

loop VCO modulation using the internal modulator

that applies the modulated data to the VCO. The

third FSK modulation type is Open loop VCO

modulation.

In ASK modulation, the user can select between two

modulation types, with or without spreading. In both

modes the modulation depth is programmable.

RadioWire

Features

•

FSK/ASK transmitter

Frequency programmable

ASK modulation depth programmable

High efficiency power amplifier

Programmable output power

Power down function

MCU reference clock

Base band package engine

TX buffer

No external tuning circuitry

Applications

•

Meter reading

Automotive

Smart Home

Remote control systems

Residential Automation

Wireless security system

MicroLead Frame and MLF are registered trademarks of Amkor Technologies

RadioWire is a registered trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

April 2006

M9999-041906

(408) 955-1690

Micrel

MICRF405

Table of Contents

General Description ................................................................................................................................................................... 1

Features ..................................................................................................................................................................................... 1

Applications................................................................................................................................................................................ 1

Table of Contents....................................................................................................................................................................... 2

Ordering Information .................................................................................................................................................................. 3

Block Diagram............................................................................................................................................................................ 3

Pin Configuration........................................................................................................................................................................ 4

(1)

Absolute Maximum Ratings ..................................................................................................................................................... 5

(2)

Operating Ratings ................................................................................................................................................................... 5

Electrical Characteristics ............................................................................................................................................................ 5

Electrical Characteristics (cont.)................................................................................................................................................. 6

Data and Configuration Interface ............................................................................................................................................... 7

Programming Interface Timing .............................................................................................................................................. 8

Writing to the Control Registers in MICRF405....................................................................................................................... 9

What to write: ........................................................................................................................................................................ 9

How to write:.......................................................................................................................................................................... 9

The two different ways to “program the chip” are: ................................................................................................................. 9

Writing to a Single Register ................................................................................................................................................... 9

How to write:.......................................................................................................................................................................... 9

Writing to All Registers ........................................................................................................................................................ 10

What to write ....................................................................................................................................................................... 10

How to write:........................................................................................................................................................................ 10

Writing to n Registers Having Incremental Addresses......................................................................................................... 10

What to write ....................................................................................................................................................................... 11

Writing to n Registers Having Non-Incremental Addresses................................................................................................. 12

Reading from the Control Registers in MICRF405 .............................................................................................................. 12

Reading from the Interrupt Register .................................................................................................................................... 12

Data Interface and Data Transfer............................................................................................................................................. 13

Packet Engine Overview: .................................................................................................................................................... 14

How to transmit a Packet with the Packet Engine: .............................................................................................................. 15

Programming Summary....................................................................................................................................................... 17

Main Modes of Operation ......................................................................................................................................................... 18

Power Amplifier ........................................................................................................................................................................ 18

Frequency Synthesizer............................................................................................................................................................. 19

Crystal Oscillator (XCO) ........................................................................................................................................................... 21

VCO ......................................................................................................................................................................................... 22

Charge Pump and PLL Filter.................................................................................................................................................... 24

Modulation................................................................................................................................................................................ 27

Bit rate settings.................................................................................................................................................................... 30

Modulator ............................................................................................................................................................................ 30

Deviation setting.................................................................................................................................................................. 31

Shaping ............................................................................................................................................................................... 31

Modulator saturation............................................................................................................................................................ 31

Lock Detect ......................................................................................................................................................................... 32

Low Dropout Regulator (LDO) and Low Battery Detector.................................................................................................... 33

Bit Description .......................................................................................................................................................................... 34

Typical Application Circuit ........................................................................................................................................................ 42

Package Information ................................................................................................................................................................ 45

April 2006

M9999-041906

(408) 955-1690

Micrel

MICRF405

Ordering Information

Part Number

MICRF405YML

Junction Temp. Range

–40° to +125°C

(1)

Package

PB-Free 24-Pin MLF

____________________________________________________________________________________________________

Block Diagram

April 2006

M9999-041906

(408) 955-1690

Micrel

MICRF405

Pin Configuration

24-Pin MLF

(Top View)

Pin Number

Pin Name

VDD

RFGND

RFVDD

RFOUT

RFGND

XTB

XTA

DVDD

DGND

VDD

CLKOUT

RDY/DATACLK

DATAIN

SCK

SIO

SEN

SRV

CPOUT

VARIN

AGND

AVDD

CIBIAS

HEATSINK

I/O

Type

Pin Function

VDD

RF Ground

RF VDD

RF output

RF Ground

Not connected

Crystal oscillator output

Crystal oscillator input

Digital VDD

Digital ground

VDD

Lock Detect output

Programmable Clock output

Transmit buffer Ready / Alternative Data clock

Alternative Data input

SPI clock

Serial input/output

Serial programming interface enable

Service interrupt pin

Charge pump output

VCO varactor input

Analog ground

Analog VDD

Bias

Ground

April 2006

M9999-041906

(408) 955-1690

Micrel

MICRF405

Absolute Maximum Ratings

(1)

Supply Voltage (V

)......................................... +3.7V

(3)

Voltage on any pin (GND = 0V). .. -0.3V to 3.7V

Lead Temperature (soldering, 20sec.)............. 260°C

Storage Temperature (T

) ................ -55°C to +150°C

(4)

ESD Rating

All pins except pin 4...................................... 2 kV

Pin 4 (RFOUT)............................................ 200 V

Operating Ratings

(2)

Supply voltage (V

)............................ +2.2V to +3.6V

RF Frequencies.......................... 290MHz to 980MHz

Data Rate (NRZ) ...........................................200kbps

Ambient Temperature (T

) .............. –40°C to +125°C

Package Thermal Resistance

MLF (Θ

) ............................................41.7°C/W

Electrical Characteristics

= 915MHz. V

= 3.0V; T

= 25°C, bold values indicate –40°C< T

< +125°C, unless noted.

Parameter

RF Frequency Operating Range

Power Supply

Power Down Current

Standby Current

PLL mode current

VCO and PLL Section

Reference Frequency

1kHz loop filter bandwidth, Fphd=200kHz

PLL startup

3kHz loop filter bandwidth, Fphd=500kHz

30kHz loop filter bandwidth,

Fphd=1000kHz

Standby-TX (PA on)

30kHz bandwidth

Crystal Oscillator Start-Up Time

Charge Pump Current

Transmit Section

Output Power

Output Power Tolerance

LOAD

= 250Ω, Pa2-0=111

LOAD

= 250Ω, Pa2-0=001

Over temperature range

Over power supply range

LOAD

= 150Ω, PA2-0=111

Tx Current Consumption

LOAD

= 150Ω, PA2-0=001

LOAD

= 150Ω, PA2-0=000

Modulation depth ASK/OOK

Binary FSK Frequency Deviation

Data Rate

(5)

Condition

Freq_band=0

Freq_band=1

Freq_band=2-3

Min

290

430

860

2.2

Typ

Max

325

490

980

3.6

Units

MHz

µA

0.3

ClkOut_en=0

PA2-0=000, PA off

7.0

1.8

140

200

16MHz, 9pF load, XCO_Fast=1

CPOUT

= 1.2V, CP_CUR = 3

300

100

-7

1.5

3.0

9.6

5.6

300

200

5.6

MHz

µs

µA

dBm

kHz

kbps

ASK=7 (OOK)

ASK=6

Bitrate = 200kbps

VCO modulation

Divider modulation

ASK

April 2006

M9999-041906

(408) 955-1690

型号	MICRF405DEV1-433	MICRF405DEV1-915	MICRF405DEV1-868
描述	RF Development Tools MICRF405 Eval Board for Experimental Use only	RF Development Tools MICRF405 Eval Board for Experimental Use only	RF Development Tools MICRF405 Eval Board for Experimental Use only
产品种类 Product Category	RF Development Tools	RF Development Tools	RF Development Tools
制造商 Manufacturer	Microchip(微芯科技)	Microchip(微芯科技)	Microchip(微芯科技)
RoHS	No	No	No
产品 Product	Development Kits	Development Kits	Development Kits
系列 Packaging	Bulk	Bulk	Bulk
工厂包装数量 Factory Pack Quantity	1	1	1

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