Rainbow Electronics MAX7058 User Manual

General Description

The MAX7058 UHF transmitter alternately transmits
ASK/OOK data at 315MHz or 390MHz using a single
crystal. The MAX7058 has internal tuning capacitors at
the output of the power amplifier that can be pro­grammed for matching to the antenna or load. The
MAX7058 can transmit at a data rate up to 100kbps
NRZ (50kbps Manchester coded). Typical transmitted
power into a 50Ω load is +10dBm. The MAX7058 oper­ates from +2.1V to +3.6V and draws under 8.0mA of
current. The standby current is less than 1µA at room
temperature. A 15MHz crystal is used as the reference
for 315MHz and 390MHz operation by selecting synthe­sizer-divide ratios of 21 and 26, respectively.

The MAX7058 is available in a 4mm x 4mm, 24-pin thin
QFN package and is specified to operate in the -40°C
to +125°C automotive temperature range.

Applications

Garage Door Openers

RF Remote Controls

Home Automation

Wireless Sensors

Security Systems

Automotive

Features

♦ Switched 315MHz/390MHz Carrier Frequency

Using One Crystal

♦ +2.1V to +3.6V Single-Supply Operation

♦ ASK/OOK Modulation

♦ Internal Switched Capacitors for Optimum Dual-

Frequency Operation

♦ 8.0mA DC Current Drain (50% Duty Cycle OOK)

♦ 0.8µA Standby Current

♦ Small 4mm x 4mm, 24-Pin Thin QFN Package

MAX7058

315MHz/390MHz Dual-Frequency

ASK Transmitter

________________________________________________________________

Maxim Integrated Products

1

Pin Configuration

Ordering Information

5

6

4

3

14

13

15

CAP3

PAOUT

ROUT

N.C.

16

N.C.

N.C.

ENABLE

TOGGLE

N.C.

N.C.

78

CAP1

10 11 12

2324 22 20 19

CAP2

N.C.

XTAL2

AVDD

PAVDD

N.C.

MAX7058

CAP4

DIN

9

21

FSEL

2

17

XTAL1

DVDD

1

18

N.C.

N.C.

DIGITAL

CONTROL

FREQUENCY
÷21 OR ÷26

CRYSTAL

OSCILLATOR

CHARGE

PUMP

PFD

LOOP
FILTER

ENVELOPE

SHAPING

EXPOSED

PADDLE

(GND)

VCO

PA

MAX7058

1

2

3

4

78 910

TQFN

11 12

24 23 22 21 20 19

5

6

18

17

16

15

14

13

N.C.

FSEL

DVDD

CAP1

N.C.

N.C.

CAP3

CAP4

PAOUT

ROUT

N.C.

N.C.

N.C.

ENABLE

TOGGLE

N.C.

CAP2

N.C.

XTAL2

XTAL1

AVDD

N.C.

PAVDD

DIN

TOP VIEW

+

*EP = EXPOSED PADDLE.

EP*

Functional Block Diagram

19-3206; Rev 0; 1/08

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.

+

Denotes a lead-free package.

*

EP = Exposed paddle.

PART TEMP RANGE PIN-PACKAGE

MAX7058ATG+ - 40°C to + 125°C

24 Thi n QFN - E P *
( 4m m x 4m m )

PKG

CODE

T2444+3

MAX7058

315MHz/390MHz Dual-Frequency
ASK Transmitter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(

Typical Operating Circuit

, 50Ω system impedance, AVDD = DVDD = PAVDD = +2.1V to +3.6V, fRF= 315MHz or 390MHz, TA=

-40°C to +125°C, unless otherwise noted. Typical values are at AVDD = DVDD = PAVDD = +2.7V, T

A

= +25°C, unless otherwise

noted. All min and max values are 100% tested at T

A

= +125°C, and guaranteed by design and characterization over temperature,

unless otherwise noted.)

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.

Supply Voltage, AVDD, DVDD, PAVDD to GND (Exposed

Paddle) ...................................………..……………-0.3V to +4V

All Other Pins ………..…Exposed Paddle - 0.3V to (VDD + 0.3V)
Continuous Power Dissipation (T

A

= +70°C)

24-Pin TQFN (derate 20.8mW/°C above +70°C) .....1666.7mW

Operating Temperature……………….………….-40°C to +125°C
Storage Temperature………………….……….…-65°C to +150°C

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage V

DD

PAVDD, AVDD, and DVDD connected to
power supply, V

PA off, V
cycle

DIN

DD

at 0% duty

fRF = 315MHz 3.4 5.4

f

= 390MHz 3.8 6.3

RF

2.1 2.7 3.6 V

V

at 50%, duty cycle

DIN

IH

IL

(Notes 1, 2, 3)

V

at 100%, duty cycle

DIN

(Note 1)

V

(Note 3) TA < +85°C 1.0 4.0Standby Current I

ENABLE

< V

IL

Supply Current I

DIGITAL I/O

Input High Threshold V

Input Low Threshold V

Pulldown Sink Current 13 µA

DD

STDBY

fRF = 315MHz 8.0 13.7

f

= 390MHz 8.3 14.2

RF

fRF = 315MHz 12.6 21.9

f

= 390MHz 12.9 22.1

RF

TA = +25°C 0.8

TA < +125°C 6.2 16.1

0.9 x

DV

DD

0.1 x

DV

mA

µA

DD

V

V

MAX7058

315MHz/390MHz Dual-Frequency

ASK Transmitter

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(

Typical Operating Circuit

, 50Ω system impedance, AVDD = DVDD = PAVDD = +2.1V to +3.6V, fRF= 315MHz or 390MHz, TA=

-40°C to +125°C, unless otherwise noted. Typical values are at AVDD = DVDD = PAVDD = +2.7V, T

A

= +25°C, unless otherwise

noted. All min and max values are 100% tested at T

A

= +125°C, and guaranteed by design and characterization over temperature,

unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GENERAL CHARACTERISTICS

Frequency Range 300 315/390 450 MHz

Power-On Time t

Maximum Data Rate

Frequency Switching Time

PHASE-LOCKED LOOP (PLL)

VCO Gain K

PLL Phase Noise

Loop Bandwidth 600 kHz

Reference Frequency Input Level 500 mV

Fr eq uency- D i vi d er Rang e 21 26

CRYSTAL OSCILLATOR

Crystal Frequency f

Frequency Pulling by V

C r ystal Load C ap aci tance (Note 4) 10 pF

ENABLE transition low-to-high, frequency

ON

VCO

XTAL

DD

settled to within 50kHz of the desired carrier

ENABLE transition low-to-high, frequency
settled to within 5kHz of the desired carrier

Manchester encoded 50

Nonreturn to zero (NRZ) 100

Time from low-to-high or high-to-low
transition of FSEL to frequency settled to
within 5kHz of the desired carrier

fRF = 315MHz

f

= 390MHz

RF

10kHz offset -87

1MHz offset -98

10kHz offset -84

1MHz offset -98

110

250

30 µs

320 MHz/V

dBc/Hz

15 MHz

4 ppm/V

µs

kbps

P-P

MAX7058

315MHz/390MHz Dual-Frequency
ASK Transmitter

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(

Typical Operating Circuit

, 50Ω system impedance, AVDD = DVDD = PAVDD = +2.1V to +3.6V, fRF= 315MHz or 390MHz, TA=

-40°C to +125°C, unless otherwise noted. Typical values are at AVDD = DVDD = PAVDD = +2.7V, T

A

= +25°C, unless otherwise

noted. All min and max values are 100% tested at T

A

= +125°C, and guaranteed by design and characterization over temperature,

unless otherwise noted.)

Note 1: Supply current and output power are greatly dependent on board layout and PAOUT match.
Note 2: 50% duty cycle at 10kHz ASK data (Manchester coded).
Note 3: Guaranteed by design and characterization, not production tested.
Note 4: Dependent on PCB trace capacitance.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER AMPLIFIER

Output Power (Note 1) P

Modulation Depth 80 dB

Maximum Carrier Harmonics

Reference Spur -48 dBc

TA = +25°C (Note 3) 4.2 10 15.5

OUT

TA = +125°C , P AV DD = AVD D = D VD D = +2.1V 3.0 5.9

TA = - 40°C , P AV D D = AV D D = D V D D = + 3.6V
( N ote 3)

With output matching
network

fRF = 315MHz -28

f

= 390MHz -32

RF

13.3 16.4

dBm

dBc

MAX7058

315MHz/390MHz Dual-Frequency

ASK Transmitter

_______________________________________________________________________________________

5

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

18

fRF = 315MHz

17

PA ON

16

15

14

13

12

SUPPLY CURRENT (mA)

11

10

9

2.1

TA = +85°C and +125°C

TA = +25°C

TA = -40°C

SUPPLY VOLTAGE (V)

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

5.0

fRF = 390MHz
PA OFF

4.5

4.0

3.5

3.0

SUPPLY CURRENT (mA)

2.5

2.0

2.1

TA = +85°C and +125°C

TA = +25°C

TA = -40°C

SUPPLY VOLTAGE (V)

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

5.0

fRF = 315MHz
PA OFF

4.5

MAX7058 toc01

3.53.32.9 3.12.5 2.72.3

TA = +125°C

4.0

3.5

3.0

SUPPLY CURRENT (mA)

2.5

2.0

2.1

TA = +85°C

TA = +25°C

TA = -40°C

3.63.12.6

SUPPLY VOLTAGE (V)

19

18

MAX7058 toc02

17

16

15

14

13

12

SUPPLY CURRENT (mA)

11

10

9

2.1

OUTPUT POWER

vs. SUPPLY VOLTAGE

14

12

MAX7058 toc05

10

8

6

SUPPLY CURRENT (mA)

4

2

0

-40

MAX7058 toc04

3.63.12.6

14

12

10

8

6

OUTPUT POWER (dBm)

4

2

0

2.1

315MHz AND 390MHz

3.63.12.6

SUPPLY VOLTAGE (V)

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

fRF = 390MHz
PA ON

TA = +125°C

TA = +85°C

SUPPLY VOLTAGE (V)

SUPPLY CURRENT

vs. OUTPUT POWER

315MHz

OUTPUT POWER (dBm)

MAX7058 toc03

TA = +25°C

TA = -40°C

3.63.12.6

MAX7058 toc06

ON

50% PA

20010-10-20-30

14

vs. OUTPUT POWER

390MHz

12

10

8

6

SUPPLY CURRENT (mA)

4

2

0

-30

SUPPLY CURRENT

ON

50% PA

OUTPUT POWER (dBm)

MAX7058 toc07

20100-10-20

-50

vs. OFFSET FREQUENCY

315MHz

-60

-70

-80

-90

-100

PHASE NOISE (dBc/Hz)

-110

-120

-130
100

PHASE NOISE

OFFSET FREQUENCY (Hz)

MAX7058 toc08

10M1M100k10k1k

-50

390MHz

-60

-70

-80

-90

-100

PHASE NOISE (dBc/Hz)

-110

-120

-130
100

PHASE NOISE

vs. OFFSET FREQUENCY

OFFSET FREQUENCY (Hz)

MAX7058 toc09

10M1M100k10k1k