MAX1472_09,MAX1472_09 pdf中文资料,MAX1472_09引脚图,MAX1472

19-2872; Rev 4; 6/12

KIT

ATION

EVALU

BLE

AVAILA

300MHz-to-450MHz Low-Power,

Crystal-Based ASK Transmitter

General Description

Features

o

2.1V to 3.6V Single-Supply Operation

o

Low 5.3mA Operating Supply Current*

o

Supports ASK with 90dB Modulation Depth

o

Output Power Adjustable to More than +10dBm

o

Uses Small Low-Cost Crystal

o

Small 3mm

3mm 8-Pin SOT23 Package

o

Fast-On Oscillator 220µs Startup Time

MAX1472

The MAX1472 is a crystal-referenced phase-locked

loop (PLL) VHF/UHF transmitter designed to transmit

OOK/ASK data in the 300MHz to 450MHz frequency

range. The MAX1472 supports data rates up to

100kbps, and adjustable output power to more than

+10dBm into a 50Ω load. The crystal-based architec-

ture of the MAX1472 eliminates many of the common

problems with SAW transmitters by providing greater

modulation depth, faster frequency settling, higher

tolerance of the transmit frequency, and reduced

temperature dependence. Combined, these improve-

ments enable better overall receiver performance when

using a superheterodyne receiver such as the MAX1470

or MAX1473.

The MAX1472 is available in a 3mm x 3mm 8-pin

SOT23 package and is specified for the automotive

(-40°C to +125°C) temperature range. An evaluation kit

is available. Contact Maxim Integrated Products for

more information.

*At

50% duty cycle (315MHz, 2.7V supply, +10dBm output

power)

Applications

Remote Keyless Entry

RF Remote Controls

Tire Pressure Monitoring

Security Systems

Radio-Controlled Toys

Wireless Game Consoles

Wireless Computer Peripherals

Wireless Sensors

PART

MAX1472AKA+T

Ordering Information

TEMP

RANGE

-40°C to +125°C

PIN-

PACKAGE

8 SOT23

TOP

MARK

AEKS

+Denotes

a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Typical Application Circuit

TOP VIEW

XTAL2 8

3.0V

2 GND

50Ω

ANTENNA

V

DD

7

Pin Configuration

*

1

+

XTAL1

+

XTAL1

1

GND

2

8

7

XTAL2

V

DD

DATA

ENABLE

MAX1472

220pF 680pF

3 PAGND

DATA 6

DATA INPUT

4 PAOUT

ENABLE 5

STANDBY OR

POWER-UP

MAX1472

PAGND

3

6

5

PAOUT

4

SOT23

*Optional

power adjust resistor.

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

1

300MHz-to-450MHz Low-Power,

Crystal-Based ASK Transmitter

MAX1472

ABSOLUTE MAXIMUM RATINGS

V

DD

to GND ..........................................................-0.3V to +4.0V

All Other Pins to GND ................................-0.3V to (V

DD

+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW

Operating Temperature Range .........................-40°C to +125°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow) .......................................+260°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(

Typical Application Circuit

, output power is referenced to 50Ω, V

DD

= 2.1V to 3.6V, V

ENABLE

= V

DD

, T

A

= -40°C to +125°C, unless

otherwise noted. Typical values are at V

DD

= 2.7V, T

A

= +25°C, unless otherwise noted.) (Note 1)

PARAMETER

SYSTEM PERFORMANCE

Supply Voltage

V

DD

V

ENABLE

= V

DD

(Note 2)

f

RF

= 315MHz

V

ENABLE

= V

DD

,

V

DATA

= V

DD

V

ENABLE

= V

DD

,

V

DATA

= 0V

V

ENABLE

= V

DD

(Note 2)

f

RF

= 433MHz

V

ENABLE

= V

DD

,

V

DATA

= V

DD

V

ENABLE

= V

DD

,

V

DATA

= 0V

Standby Current

Frequency Range

Data Rate

Modulation Depth

Output Power

P

OUT

I

STDBY

f

RF

V

ENABLE

< V

IL

, T

A

< +85°C (Note 3)

V

ENABLE

< V

IL

T

A

< +125°C (Note 3)

(Note 1)

(Note 3)

ON to OFF P

OUT

ratio (Note 4)

T

A

= +25°C, V

DD

= 2.7V (Notes 5, 6)

T

A

= +125°C, V

DD

= 2.1V (Notes 5, 6)

T

A

= -40°C, V

DD

= 3.6V (Notes 5, 6)

Turn-On Time

Transmit Efficiency with CW

Transmit Efficiency at 50%

Duty Cycle

t

ON

To f

OFFSET

< 50kHz (Note 7)

To f

OFFSET

< 5kHz (Note 7)

f

RF

= 315MHz (Note 8)

f

RF

= 433MHz (Note 8)

f

RF

= 315MHz (Note 9)

f

RF

= 433MHz (Note 9)

7.3

3.3

300

0

90

10.3

6.0

13.7

220

450

43.6

41.3

37.6

35.1

16.2

µs

%

12.8

dBm

2.1

5.3

9.1

1.5

5.7

9.6

1.7

5

2.7

350

1.7

450

100

nA

µA

MHz

kbps

dB

3.6

9.4

16.6

2.3

mA

V

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Current

I

DD

2

300MHz-to-450MHz Low-Power,

Crystal-Based ASK Transmitter

ELECTRICAL CHARACTERISTICS (continued)

(

Typical Application Circuit

, output power is referenced to 50Ω, V

DD

= 2.1V to 3.6V, V

ENABLE

= V

DD

, T

A

= -40°C to +125°C, unless

otherwise noted. Typical values are at V

DD

= 2.7V, T

A

= +25°C, unless otherwise noted.) (Note 1)

PARAMETER

VCO Gain

f

RF

= 315MHz

Phase Noise

f

RF

= 433MHz

Maximum Carrier Harmonics

Reference Spur

Loop Bandwidth

Crystal Frequency

Oscillator Input Capacitance

Frequency Pushing by V

DD

DIGITAL INPUTS

Data Input High

Data Input Low

Maximum Input Current

Pulldown Current

V

IH

V

IL

2

25

V

DD

- 0.25

0.25

V

nA

µA

f

XTAL

From each XTAL pin to GND

f

RF

= 315MHz

f

RF

= 433MHz

f

RF

= 315MHz

f

RF

= 433MHz

f

OFFSET

=100kHz

f

OFFSET

= 1MHz

f

OFFSET

=100kHz

f

OFFSET

= 1MHz

SYMBOL

CONDITIONS

MIN

TYP

330

-84

-91

-82

-89

-50

-75

-81

1.6

f

RF

/ 32

6.2

3

dBc

MHz

pF

ppm/V

dBc/Hz

MAX

UNITS

MHz/V

MAX1472

PHASE-LOCKED LOOP PERFORMANCE

Note 1:

Note 2:

Note 3:

Note 4:

Note 5:

Note 6:

Note 7:

Note 8:

Note 9:

100% tested at T

A

= +25°C. Guaranteed by design and characterization over temperature.

50% duty cycle at 10kHz data.

Guaranteed by design and characterization, not production tested.

Generally limited by PC board layout.

Output power can be adjusted with external resistor.

Guaranteed by design and characterization at f

RF

= 315MHz.

V

ENABLE

< V

IL

to V

ENABLE

> V

IH

. f

OFFSET

is defined as the frequency deviation from the desired carrier frequency.

V

ENABLE

> V

IH

, V

DATA

> V

IH

, Efficiency = P

OUT

/(V

DD

x I

DD

).

V

ENABLE

> V

IH

, DATA toggled from V

IL

to V

IH

, 10kHz, 50% duty cycle, Efficiency = P

OUT

/(V

DD

x I

DD

).

3

300MHz-to-450MHz Low-Power,

Crystal-Based ASK Transmitter

MAX1472

Typical Operating Characteristics

(Typical

Application Circuit,

V

DD

= 2.7V, T

A

= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX1472 toc01

SUPPLY CURRENT vs. SUPPLY VOLTAGE

1.8

SUPPLY CURRENT (mA)

1.7

1.6

1.5

1.4

1.3

1.2

1.1

+25°C

-40°C

V

ENABLE

= V

IH

,

V

DATA

= V

IL

,

f

RF

= 315MHz

+85°C

+125°C

MAX1472 toc02

SUPPLY CURRENT vs. SUPPLY VOLTAGE

12

SUPPLY CURRENT (mA)

11

10

9

8

7

6

5

+125°C

V

ENABLE

= V

IH

,

V

DATA

= V

IH

,

f

RF

= 433MHz

-40°C

+25°C

+85°C

MAX1472 toc03

13

12

SUPPLY CURRENT (mA)

11

10

9

8

7

6

5

V

ENABLE

= V

IH

,

V

DATA

= V

IH

,

f

RF

= 315MHz

-40°C

1.9

13

+25°C

+125°C

+85°C

2.0

2.4

2.8

3.2

3.6

2.0

2.4

2.8

3.2

3.6

2.0

2.4

2.8

3.2

3.6

SUPPLY VOLTAGE (V)

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX1472 toc04

OUTPUT POWER vs. SUPPLY VOLTAGE

MAX1472 toc05

OUTPUT POWER vs. SUPPLY VOLTAGE

13

OUTPUT POWER (dBm)

12

11

10

9

8

7

6

+85°C

-40°C

+125°C

V

ENABLE

= V

IH

,

V

DATA

= V

IH

,

f

RF

= 433MHz

MAX1472 toc06

2.2

V

ENABLE

= V

IH

,

V

DATA

= V

IL

,

f

RF

= 433MHz

+85°C

+125°C

14

13

OUTPUT POWER (dBm)

12

11

10

9

14

2.0

SUPPLY CURRENT (mA)

V

ENABLE

= V

IH

,

V

DATA

= V

IH

,

f

RF

= 315MHz

-40°C

-25°C

+25°C

1.8

+125°C

+85°C

1.6

+25°C

1.4

-40°C

8

7

6

1.2

2.0

2.4

2.8

3.2

3.6

SUPPLY VOLTAGE (V)

5

2.0

2.4

2.8

3.2

3.6

SUPPLY VOLTAGE (V)

2.0

2.4

2.8

3.2

3.6

SUPPLY VOLTAGE (V)

REFERENCE SPUR MAGNITUDE

vs. SUPPLY VOLTAGE

MAX1472 toc07

FREQUENCY STABILITY

vs. SUPPLY VOLTAGE

MAX1472 toc08

TRANSMIT POWER EFFICIENCY

vs. SUPPLY VOLTAGE

MAX1472 toc09

-65

-67

-69

REFERENCE SPUR (dBc)

-71

-73

-75

-77

-79

-81

-83

-85

2.0

2.4

2.8

3.2

433MHz

315MHz

2

1

OFFSET FREQUENCY (ppm)

0

-1

-2

-3

-4

315MHz

433MHz

55

50

EFFICIENCY (%)

45

40

35

+85°C

30

25

+125°C

CW OUTPUT

f

RF

= 315MHz

2.0

2.4

2.8

3.2

-40°C

+25°C

3.6

2.0

2.4

2.8

3.2

3.6

SUPPLY VOLTAGE (V)

4

300MHz-to-450MHz Low-Power,

Crystal-Based ASK Transmitter

Typical Operating Characteristics (continued)

(Typical

Application Circuit,

V

DD

= 2.7V, T

A

= +25°C, unless otherwise noted.)

TRANSMIT POWER EFFICIENCY

vs. SUPPLY VOLTAGE

MAX1472 toc10

MAX1472

TRANSMIT POWER EFFICIENCY

vs. SUPPLY VOLTAGE

MAX1472 toc11

TRANSMIT POWER EFFICIENCY

vs. SUPPLY VOLTAGE

MAX1472 toc12

50

-40°C

+25°C

50

45

EFFICIENCY (%)

40

35

30

25

20

+85°C

-40°C

+25°C

45

EFFICIENCY (%)

40

-40°C

EFFICIENCY (%)

35

+25°C

40

+125°C

35

+85°C

30

+85°C

25

+125°C

OOK OUTPUT AT

50% DUTY CYCLE

f

RF

= 315MHz

2.8

3.2

3.6

30

CW OUTPUT

f

RF

= 433MHz

2.0

2.4

2.8

3.2

3.6

25

SUPPLY VOLTAGE (V)

20

2.0

2.4

2.8

OOK OUTPUT AT

50% DUTY CYCLE

f

RF

= 433MHz

3.2

3.6

2.0

2.4

SUPPLY VOLTAGE (V)

PHASE NOISE vs. OFFSET FREQUENCY

MAX1472 toc13

SUPPLY CURRENT AND OUTPUT POWER

vs. EXTERNAL RESISTOR

12

10

OUTPUT POWER (dBm)

8

6

4

2

0

POWER

MAX1472 toc14

SUPPLY CURRENT vs. OUTPUT POWER

f

RF

= 315MHz

9

SUPPLY CURRENT (mA)

8

7

CW

6

5

4

3

2

0

2

4

6

8

10

OUTPUT POWER (dBm)

50% DUTY CYCLE

SUPPLY CURRENT (mA)

MAX1472 toc15

-40

-50

-60

PHASE NOISE (dBc/Hz)

-70

-80

-90

-100

-110

-120

-130

-140

10

100

1k

10k

f

OFFSET

(Hz)

100k

1M

f

RF

= 315MHz

12

10

8

6

4

2

10

CURRENT

10M

0.1

1

10

100

0

1000

EXTERNAL RESISTOR (Ω)

FREQUENCY SETTLING TIME

MAX1472 toc16

AM DEMODULATION OF PA OUTPUT

MAX1472 toc17

25kHz/div

ENABLE

TRANSITION

FROM LOW

TO HIGH

START: 0s

1ms

ENABLE

TRANSITION

FROM LOW

TO HIGH

START: 0s

1ms

START: 0s

15%/div

DATA RATE

= 100kHz

2.5kHz/div

STOP: 20µs

5

MAX1472_09

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