MAXIM MAX7049 Technical data

E V A L U A T I O N K IT A V A I L A B L E

19-5867; Rev 0; 6/11

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

General Description

The MAX7049 high-performance, single-chip, ultralow-power ASK/FSK UHF transmitter operates in the industrial, scientific, medical (ISM) band at 288MHz to 945MHz carrier frequencies. The IC also includes a low phase noise fractional-N synthesizer for precise tuning, fast frequency agility, and low out-of-band power. To support narrow-band applications, the IC has both amplitude-shaping and frequency-shaping functions that enable the user to optimize spectral efficiency. The IC offers Tx power up to +15dBm. These features make the transmitter ideally suited for long-range applications.

Additional system-level features of the IC include a digital temperature sensor and a number of flexible GPOs for monitoring radio status and for the control of external functions. A complete transmitter system can be built using a low-end microprocessor control unit (MCU), the IC, a crystal, and a small number of passive components.

The IC is available in a small, 5mm x 5mm, 28-pin TQFN package with an exposed pad. It is specified to operate in the -40°C to +125°C automotive temperature range.

Applications

Automatic Meter Reading (AMR)

RF Modules

Long-Range, One-Way Remote Keyless Entry (RKE)

Wireless Sensor Networks

TPMS

Home Security

Home Automation

RFID

Remote Controls

Benefits and Features

S Transmitter (Tx)

 Provides Long Transmit Range Up to +15dBm 21mA Tx Current for +10dBm Tx Power* 41mA Tx Current for +15dBm Tx Power* Modulation Shaping, ASK, FSK

S General

 Delivers Long Battery Life < 50nA Shutdown Current < 350nA Sleep Current Minimizes the Number of I/Os Required Between the IC and the MCU Serial Peripheral Interface (SPI™)  Regulatory Compliant FCC Part 15 Frequency Hopping ETSI EN300-220 Compatible

 On-Chip Temperature Sensor  Fast Fractional-N Synthesizer with a

User-Defined External Loop Filter

*VDD = 3.0V. Includes losses for the matching network and regulatory-compliant harmonic filter.

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX7049.related.

SPI is a trademark of Motorola, Inc.

�� Maxim Integrated Products 1

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.

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

LIST OF FIGURES

Figure 1. SPI Timing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 2. Typical Operating Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 3. Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 4. Digital Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 5. Digital Output Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 6. SPI Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 7. SPI Write Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 8. SPI Read Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 9. SPI Read-All Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 10. SPI Reset Command Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 11. Operating Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 12. Tx Warmup Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 13. Frequency-Hopping Spread-Spectrum (FHSS) Flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 14. Recommended Crystal Connection to the IC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Figure 15. Fractional-N Synthesizer Configuration Tx ASK Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Figure 16. Tx FSK Mode Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 17. Tx FSK Frequency Waveshaping Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 18. Synthesizer Loop Filter Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 19. Lock Detector Delay Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 20. Power Amplifier Topology and Optimum Signal Swings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Figure 21. Tx ASK Mode Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 22. ASK Waveshaping Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 23. Tx FSK Amplitude Ramp Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Figure 24. Tx FSK Amplitude Ramp Timing Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

LIST OF TABLES

Table 1. Optional Digital Input Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 2. Mode Control Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 3. Mode Option Logic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 4. Sleep Mode Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 5. Temperature Sensor Mode Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 6. Crystal Divider Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 7. LO Frequency-Divider Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Table 8. Tx FSK Pulse Mode Frequency Multiplier Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 9. PA Design Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

�� Maxim Integrated Products 3

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

LIST OF TABLES (continued)

Table 10. Configuration Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Table 11. Group 0: Identification Register (Ident). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 12. Ident Register (0x00) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 13. Group 1: General Configuration Registers (Conf0, Conf1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 14. Conf0 Register (0x01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Table 15. Conf1 Register (0x02). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Table 16. Group 2: GPO, Data Output, and Clock Output Registers (IOConf0, IOConf1, IOConf2). . . . . . . . . . . . . . 38

Table 17. IOConf0 Register (0x03) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Table 18. Register IOConf1 (0x04). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 19. Register IOConf2 (0x05). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 20. Group 3: Synthesizer Frequency Settings (FBase0, FBase1, FBase2, FLoad) . . . . . . . . . . . . . . . . . . . . . . 41

Table 21. Synthesizer Divider Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 22. Synthesizer Programming Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 23. Frequency Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 24. FBase0 Register (0x08) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 25. FBase1 Register (0x09) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 26. FBase2 Register (0x0A) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 27. FLoad (0x0B) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Table 28. Group 4: Transmiter Amplitude and Timing Parameters (TxConf0, TxConf1, TxTstep). . . . . . . . . . . . . . . . . 43

Table 29. TxConf0 Register (0x0C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 30. TxConf1 Register (0x0D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 31. TxTstep Register (0x0E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Table 32. Group 5: Transmitter Shaping Registers (Shape00–Shape18). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Table 33. Shape00 Register (0x0F) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Table 34. Shape01–Shape18 Registers (0x10–0x21) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Table 35. Group 6: Control Registers (TestMux, Datain, EnableReg) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Table 36. TestMux Register (0x3C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Table 37. Datain Register (0x3D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 38. EnableReg Register (0x3E) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 39. Group 7: Read-Only Status Registers (TestBus0, TestBus1, Status0, Status1) . . . . . . . . . . . . . . . . . . . . . . 46

Table 40. TestBus0 Register (0x40) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Table 41. Test Bus Signals (tbus[15:8]). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 42. TestBus1 Register (0x41) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Table 43. Test Bus Signals (tbus[7:0]) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Table 44. Status0 Register (0x42) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Table 45. Status1 Register (0x43) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

�� Maxim Integrated Products 4

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

ABSOLUTE MAXIMUM RATINGS

PAVDD, LOVDD, VCOVDD, CPVDD, PLLVDD,

XOVDD, DVDD, and AVDD to EP ....................-0.3V to +3.6V

ENABLE, DATAIN, SDI, SDO, CS, SCLK,

GPO1, GPO2, HOP, and SHDN to EP . -0.3V to (VDD + 0.3V)

All Other Pins to EP .................................. -0.3V to (VDD + 0.3V)

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.

CAUTION! ESD SENSITIVE DEVICE

DC ELECTRICAL CHARACTERISTICS

(Figure 2, 50I system impedance, VDD = +2.1V to +3.6V, fRF = 868MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C, unless otherwise noted. All min and max values are 100% tested at TA = +125°C and are guaranteed by design and characterization over temperature, unless otherwise noted.)

Continuous Power Dissipation (TA = +70NC)

TQFN (single-layer board)

(derate 21.3mW/NC above +70NC) ......................... 1702.1mW

Operating Temperature Range ........................ -40NC to +125NC

Storage Temperature Range ............................ -65NC to +150NC

Lead Temperature (soldering, 10s) ................................+300NC

Soldering Temperature (reflow) ......................................+260NC

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage V

Operating Current I

Shutdown Current

Input Low Voltage V

Input High Voltage V

DD

PAVDD, LOVDD, VCOVDD, CPVDD, PLLVDD, XOVDD, DVDD, and AVDD connected to power supply

fRF = 315MHz 11.2

PA off

PA off, PA predriver at high current setting

P

= +15dBm

OUT

P

= +10dBm

OUT

TA = +25NC, Sleep mode

TA = +85NC, Sleep mode

TA = +125NC, Sleep mode

TA = +25NC, Shutdown mode (registers reset)

TA = +85NC, Shutdown mode (registers reset)

TA = +125NC, Shutdown mode (registers reset)

IL

IH

fRF = 434MHz 10.4

fRF = 863MHz to 945MHz 10.2

fRF = 315MHz 13.2

fRF = 434MHz 12.4

fRF = 863MHz to 945MHz 12.2

868MHz +15dBm matching network with harmonic filter

868MHz +10dBm matching network with harmonic filter

2.1 3.0 3.6 V

41

21

350

600

1700 4000

50

200

1300 3500

0.2 x V

DD

0.8 x V

DD

mA

nA

V

�� Maxim Integrated Products 5

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

DC ELECTRICAL CHARACTERISTICS (continued)

(Figure 2, 50I system impedance, VDD = +2.1V to +3.6V, fRF = 868MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C, unless otherwise noted. All min and max values are 100% tested at TA = +125°C and are guaranteed by design and characterization over temperature, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Pulldown Sink Current 12.5

Pullup Source Current 12.5

In buffer mode, GPO1 250FA sink current,

Output Low Voltage V

Output High Voltage V

SDO 1mA sink current, and GPO2 4mA

OL

sink current

In buffer mode, GPO1 250FA source current, SDO 1mA source current, and GPO2 4mA

OH

source current

0.225

VDD - 0.225

AC ELECTRICAL CHARACTERISTICS

(Figure 2, 50I system impedance, VDD = +2.1V to +3.6V, fRF = 868MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C, unless otherwise noted. All min and max values are 100% tested at TA = +125°C and are guaranteed by design and characterization over temperature, unless otherwise noted.)

FA

V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GENERAL CHARACTERISTICS

Divide-by-1 LO divider setting 863 945

Operating Frequency

Divide-by-3 LO divider setting 287.7 315

Maximum Data Rate

Maximum Frequency Deviation 100kHz synthesizer loop bandwidth

Frequency Settling Time t

POWER AMPLIFIER

Maximum Output Power P

Programmable PA Bias Current Step

Programmable PA Power Dynamic Range

Modulation Depth With respect to +10dBm output power 57 dB

Maximum Carrier Harmonics With output matching network -50 dBc

MAX

Manchester encoded 100

NRZ encoded 200

From Enable low-to-high transition to LO within 5kHz of final value, 100kHz synthesizer loop bandwidth

ON

From Enable low-to-high transition to LO within 1kHz of final value, 100kHz synthesizer loop bandwidth

Match to 50I, including harmonic filter

With Q1% 56.2kI external PA reference current setting resistor

Power range from decimal 1 to decimal 63 on digital PA bias current

Q150

330

400

+15 dBm

0.5 mA

36 dB

MHzDivide-by-2 LO divider setting 431.5 472.5

kbps

kHz

Fs

�� Maxim Integrated Products 6

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

AC ELECTRICAL CHARACTERISTICS (continued)

(Figure 2, 50I system impedance, VDD = +2.1V to +3.6V, fRF = 868MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C, unless otherwise noted. All min and max values are 100% tested at TA = +125°C and are guaranteed by design and characterization over temperature, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

FRACTIONAL-N SYNTHESIZER

VCO Gain K

Close-In Phase Noise 10kHz offset, 100kHz loop BW -101 dBc/Hz

VCO Phase Noise 1MHz offset, 863MHz to 945MHz -126 dBc/Hz

Charge-Pump Current I

LO Divider Settings

Minimum Synthesizer Frequency Step

Reference Spur -71 dBc

Frequency Switching Time

Reference Frequency Input Level

ADC

Resolution 7 Bits

LSB Bit Width 7.25 mV

CRYSTAL OSCILLATOR

Crystal Frequency f

Frequency Pulling by V

Recommended Crystal Load Capacitance

Maximum Crystal Load Capacitance

TEMPERATURE SENSOR

Range -40 to +125

Digital Code Slope 2

SPI TIMING CHARACTERISTICS (Figure 1)

Minimum SCLK Low to Falling Edge of CS Setup Time

Minimum CS Low to Rising Edge of SCLK Setup Time

DD

VCO

XTAL

t

CSS

Referenced to 863MHz to 945MHz LO 108 MHz/V

V

= V

CP

SC

OUT

V

= V

OUT

Referenced to 863MHz to 945MHz LO or carrier frequency band

26MHz frequency step, 902MHz to 928MHz band, 100kHz synthesizer loop bandwidth

/2, low setting (icont bit = 0) 204

CPVDD

/2, high setting (icont bit = 1) 407

CPVDD

1

2

3

16

f

/2

XTAL

48

1 V

16 to 22.4 MHz

0.5 ppm/V

10

20

20 ns

30 ns

FA

Hz

Fs

P-P

pF

NC

NC/LSB

�� Maxim Integrated Products 7

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

AC ELECTRICAL CHARACTERISTICS (continued)

(Figure 2, 50I system impedance, VDD = +2.1V to +3.6V, fRF = 868MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C, unless otherwise noted. All min and max values are 100% tested at TA = +125°C and are guaranteed by design and characterization over temperature, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Minimum SCLK Low to Rising Edge of CS Setup Time

Minimum SCLK Low after Rising Edge of CS Hold Time

Minimum Data Valid to SCLK Rising-Edge Setup Time

Minimum Data Valid to SCLK Rising-Edge Hold Time

Minimum SCLK High Pulse Width

Minimum SCLK Low Pulse Width t

Minimum CS High Pulse Width

Maximum Transition Time from Falling Edge of CS to Valid SDO

Maximum Transition Time from Falling Edge of SCLK to Valid SDO

t

HCS

t

HS

t

DS

t

DH

t

CH

CL

t

CSH

t

CSG

t

CG

CL = 10pF load capacitance from SDO to GND

30 ns

20 ns

15 ns

10 ns

30 ns

20 ns

CS

SCLK

SDI

SDO

Figure 1. SPI Timing Diagram

�� Maxim Integrated Products 8

t

CSH

t

CSS

t

SC

t

DH

t

DS

t

CSG

t

CG

t

HCS

t

CH

t

CL

t

HS

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

Typical Operating Characteristics

(Figure 2, 50Ω system impedance, VDD = +2.1V to +3.6V, fRF = 288MHz to 945MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C, unless otherwise noted.)

SHUTDOWN MODE CURRENT

vs. TEMPERATURE

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

SHUTDOWN MODE CURRENT (µA)

0.2

0

-50 125 TEMPERATURE (°C)

VDD = 3.6V

VDD = 3.0V

VDD = 2.7V

VDD = 2.1V

VCO TUNING CHARACTERISTIC

(IN 900MHz BAND) vs. CONTROL VOLTAGE

1000

TA = +125˚C

0.7

0.8

TA = -40˚C

0.9

1.0

TA = +85˚C

1.1

1.2

1.3

980

960

940

920

900

880

860

TRANSMIT FREQUENCY (MHz)

840

820

800

TA = +25˚C

0.3

0.4

0.5

CONTROL VOLTAGE WITH RESPECT TO SUPPLY (V)

0.6

SLEEP MODE CURRENT

vs. TEMPERATURE

2.4

2.2

2.0

MAX7049 toc01

1.8

1.6

1.4

1.2

1.0

0.8

0.6

SLEEP MODE CURRENT (µA)

0.4

0.2 0

1007550250-25

-50 125

VDD = 2.1V

TEMPERATURE (°C)

VDD = 3.6V

VDD = 3.0V

VDD = 2.7V

1007550250-25

120

100

MAX7049 toc02

TEMPERATURE SENSOR CODE (DECIMAL)

TEMPERATURE SENSOR CODE

vs. TEMPERATURE

80

60

40

20

0

-50 125 TEMPERATURE (°C)

1007550250-25

MAX7049 toc03

CHARGE-PUMP CURRENT

FREQUENCY SETTLING

AFTER POWER-UP

868.62MHz

MAX7049 toc04

868.60MHz

868.58MHz

1.4

1.5

1.6

1.7

1.8

0.00s

500.0µs 1.000ms

100.0µs/div

MAX7049 toc05

250

200

150

100

CHARGE-PUMP CURRENT (µA)

50

0

vs. CONTROL VOLTAGE

(LOW CURRENT SETTING, 2.1V SUPPLY)

-40˚C-40˚C

+25˚C

+85˚C

+125˚C

DOWN

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

CONTROL VOLTAGE WITH RESPECT TO GROUND (V)

UP

MAX7049 toc06

�� Maxim Integrated Products 9

MAX7049

(3kHz RBW, 4kHz SQUARE-WAVE MODULATION,

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

Typical Operating Characteristics (continued)

(Figure 2, 50Ω system impedance, VDD = +2.1V to +3.6V, fRF = 288MHz to 945MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C, unless otherwise noted.)

PHASE NOISE (VCO DOMINATED)

vs. OFFSET FREQUENCY

(C

= 0.1µF, CS = 0.01µF,

L

R = 200I, RP = CP = 0)

-70

-80

-90

-100

-110

PHASE NOISE (dBc/Hz)

-120

-130

-140 10 10,000

868MHz, ibsel = 0

927MHz, ibsel = 0

927MHz, ibsel = 1

OFFSET FREQUENCY (kHz)

UNMODULATED CLOSE-IN SPECTRUM (100Hz RBW, 100 SAMPLE AVERAGE,

16MHz CRYSTAL, ibsel = 0, icont = 0)

0

-10

-20

-30

-40

-50

POWER (dBc)

-60

-70

-80

-90

926.990

926.994 926.998 927.002 927.006 927.010

926.992 926.996 927.000 927.004 927.008 FREQUENCY (MHz)

UNMODULATED CLOSE-IN SPECTRUM (100Hz RBW, 100 SAMPLE AVERAGE,

22.4MHz CRYSTAL, ibsel = 0, icont = 0)

0

-10

MAX7049 toc07

-20

-30

-40

-50

POWER (dBc)

-60

-70

-80

1000100

-90

868.590

868.594 868.598 868.602 868.606 868.610

868.592 868.596 868.600 868.604 868.608 FREQUENCY (MHz)

MAX7049 toc08

UNMODULATED SPECTRUM

UNMODULATED CLOSE-IN SPECTRUM (100Hz RBW, 100 SAMPLE AVERAGE,

22.4MHz CRYSTAL, ibsel = 0, icont = 0)

0

-10

-20

-30

-40

-50

POWER (dBc)

-60

-70

-80

-90

926.990

926.994 926.998 927.002 927.006 927.010

926.992 926.996 927.000 927.004 927.008 FREQUENCY (MHz)

ASK MODULATION SPECTRUM

MAX7049 toc09

(palopwr = 0, 100% DUTY CYCLE,

MAX7049 toc10

+10dBm, 868MHz,

WITH +10dBm AT 3V MATCH)

0

-10

-20

-30

-40

-50

POWER (dBc)

-60

-70

-80

-90

-100 848 888

FREQUENCY (MHz)

MAX7049 toc11

883878868 873858 863853

+10dBm OUTPUT POWER, WITH

+10dBm AT 3V MATCH)

0

-10

-20

-30

-40

POWER (dBc)

-50

-60

-70

-80

867.75

867.85 867.95 868.05 868.15 868.25

867.80 867.90 868.00 868.10 868.20

GAUSSIAN

FREQUENCY (MHz)

UNSHAPED

MAX7049 toc12

�� Maxim Integrated Products 10

MAX7049

POWER (dBc)

(1kHz RBW, 4kHz SQUARE-WAVEMODULATION,

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

Typical Operating Characteristics (continued)

(Figure 2, 50Ω system impedance, VDD = +2.1V to +3.6V, fRF = 288MHz to 945MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C, unless otherwise noted.)

ASK MODULATION SPECTRUM

(3kHz RBW, 4kHz SQUARE-WAVE MODULATION,

+9dBm OUTPUT POWER, WITH

+10dBm AT 3V MATCH)

0

-10

-20

-30

-40

-50

-60

-70

-80

867.75

867.85 867.95 868.05 868.15 868.25

867.80 867.90 868.00 868.10 868.20

GAUSSIAN

FREQUENCY (MHz)

FSK MODULATION SPECTRUM

(3kHz RBW, 4kHz SQUARE-WAVE MODULATION,

Q100kHz DEVIATION, +10dBm OUTPUT

POWER, WITH +10dBm AT 3V MATCH)

0

-10

GAUSSIAN

-20

-30

-40

-50

POWER (dBc)

-60

-70

-80

-90

867.4 867.8 868.2 868.6867.6 868.0 868.4

UNSHAPED

FREQUENCY (MHz)

MAX7049 toc13

FSK MODULATION SPECTRUM (1kHz RBW,

4kHz SQUARE-WAVE MODULATION,

±4kHz DEVIATION, +10dBm OUTPUT

POWER, WITH +10dBm AT 3V MATCH)

0

-10

GAUSSIAN

-20

-30

-40

POWER (dBc)

-50

-60

-70

-80

867.95 867.97 867.99 868.01 868.03 868.05

867.96 867.98 868.00 868.02 868.04

MAX7049 toc16

FREQUENCY (MHz)

FSK MODULATION SPECTRUM

±4kHz DEVIATION, +10dBm OUTPUT POWER,

WITH +10dBm AT 3V MATCH)

0

-10

MAX7049 toc14

UNSHAPED

-20

-30

-40

POWER (dBc)

-50

-60

-70

-80

867.95 867.97 867.99 868.01 868.03 868.05 FREQUENCY (MHz)

FSK MODULATION SPECTRUM

(3kHz RBW, 4kHz SQUARE-WAVE MODULATION,

Q100kHz DEVIATION, +10dBm OUTPUT

POWER, WITH +10dBm AT 3V MATCH)

0

-10

UNSHAPED

-20

-30

-40

-50

POWER (dBc)

-60

-70

-80

-90

867.4 867.8 868.2 868.6867.6 868.0 868.4 FREQUENCY (MHz)

MAX7049 toc15

MAX7049 toc17

�� Maxim Integrated Products 11

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

Typical Operating Characteristics (continued)

(Figure 2, 50Ω system impedance, VDD = +2.1V to +3.6V, fRF = 288MHz to 945MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C, unless otherwise noted.)

Tx CURRENT vs. TEMPERATURE

(PA OFF, 900MHz BAND, palopwr = 1)

10.60

10.50

10.40

10.30

10.20

Tx CURRENT (mA)

10.10

10.00

9.90

-50 125

VDD = 3.6V

VDD = 2.1V

TEMPERATURE (°C)

VDD = 3.0V

VDD = 2.7V

PA POWER vs. PA CODE

(palopwr = 1, 100% DUTY CYCLE, 868MHz,

WITH +10dBm AT 3V MATCH)

15

10

5

(dBm)

OUT

P

0

-5

-10 0 64

2.1V

PA CODE (DECIMAL)

20

15

MAX7049 toc18

10

(dBm)

OUT

P

1007550250-25

2.4V 2.7V 3.0V 3.3V 3.6V

-10

5648403224168

(palopwr = 0, 100% DUTY CYCLE, 915MHz,

PA POWER vs. PA CODE

WITH +15dBm AT 3V MATCH)

3.6V

3.0V

5

0

-5

0 64

PA CODE (DECIMAL)

2.1V

5648403224168

(palopwr = 0, 100% DUTY CYCLE, 868MHz,

14

(dBm)

OUT

P

12

10

8

6

4

2

0

-2

MAX7049 toc21

(palopwr = 0, 100% DUTY CYCLE, 868MHz,

PA POWER vs. PA CODE

WITH +15dBm AT 3V MATCH)

20

3.6V

2.1V

MAX7049 toc19

15

10

(dBm)

5

OUT

P

0

-5

-10 0 64

PA CODE (DECIMAL)

PA POWER vs. PA CODE

WITH +15dBm AT 3V MATCH)

PA CODE 39

PA CODE 19

-50 125

PA CODE 10

10075-25 0 25 50

TEMPERATURE (°C)

MAX7049 toc20

3.0V

5648403224168

MAX7049 toc22

�� Maxim Integrated Products 12

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

Pin Configuration

TOP VIEW

CS

SCLK

SDI

18

4 5 6 7

N.C.

LOVDD

ENABLE

EP

CTRL

VCOVDD

DATAIN

SDO

CPVDD

14

N.C.

XTALB

13

12

XTALC

XOVDD

11

10

N.C.

PLLVDD

9

8

CPOUT

DVDD

HOP

GPO1

SHDN

AVDD

PA+

PA-

GPO2

2021 19 17 16 15

22

23

24

25

26

27

28

1 2

+

PAVDD

MAX7049

3

REXTPA

TQFN

(5mm x 5mm)

Pin Description

PIN NAME FUNCTION

1 PAVDD Power Amplifier Supply Voltage Input. Bypass to ground with 33pF capacitor as close as possible to the pin.

External PA Bias Current Setting Resistor Connection. Couple to ground through a Q1% tolerance low-

2 REXTPA

3, 10,

14

N.C. No Connection. Leave unconnected.

4 LOVDD

5 VCOVDD

6 CTRL

7 CPVDD 8 CPOUT Charge-Pump Output. Connect through passive loop filter to CTRL. 9 PLLVDD Synthesizer Supply Voltage Input. Bypass to ground with 33pF capacitor as close as possible to the pin.

11 XOVDD

temperature coefficient resistor. A resistor of 56.2kI is recommended for a 0.5mA nominal PA bias current DAC LSB value.

Local Oscillator (LO) Supply Voltage Input. Bypass to ground with 33pF capacitor as close as possible to the pin.

Voltage-Controlled Oscillator (VCO) Supply Voltage. Bypass to ground with 1FF capacitor as close as possible to the pin.

Control (Tuning) Voltage for VCO Input. Referenced to VCOVDD pin. Connect through passive loop filter to CPOUT.

Charge-Pump Supply Voltage Input. Bypass to ground with 0.01FF capacitor as close as possible to the pin.

Crystal Oscillator Supply Voltage Input. Bypass to ground with 0.1FF capacitor as close as possible to the pin.

�� Maxim Integrated Products 13

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

Pin Description (continued)

PIN NAME FUNCTION

Collector Crystal Input. Connect to crystal either directly or through an AC-coupling capacitor. A shunt

12 XTALC

13 XTALB

15 SDO Serial Peripheral Interface (SPI) Data Output. It can also be configured as a general-purpose digital output. 16 DATAIN Transmitter Data Input. The Datain function can also be controlled by SPI. Internally pulled to ground.

17 ENABLE

18 SCLK SPI Clock. Internally pulled to ground. 19 SDI SPI Data Input. Internally pulled to ground. 20 21 GPO2 General-Purpose Output 2. High drive strength digital general-purpose output. 22 DVDD

23 HOP

24 GPO1 General-Purpose Output 1. Low drive strength digital general-purpose output.

25 SHDN

26 AVDD

27 PA+

28 PA-

— EP

CS

capacitance to ground might be needed depending on the specified load capacitance of the crystal and PCB stray capacitances. Can be driven by an AC-coupled external reference with a signal swing of

0.8V

Base Crystal Input. Connect to crystal either directly or through an AC-coupling capacitor. A shunt capacitance to ground might be needed depending on the specified load capacitance of the crystal and PCB stray capacitances. Must be DC shorted to ground if XTALC is driven by external reference.

Enable. Drive high for active operation. Drive low or leave unconnected to put the device into Sleep mode. The enable function can also be controlled by SPI. Internally pulled to ground.

SPI Active-Low Chip Select. Internally pulled to supply.

Digital Supply Voltage Input. Bypass to ground with 0.1FF capacitor as close as possible to the pin.

Frequency Hop Pin. Transfers the base[20:0] bits to the fractional-N divider. See the Fractional-N Synthesizer section. The hop function can also be controlled by SPI. Internally pulled to ground.

Shutdown Digital Input. Turns off internal power-on-reset (POR) circuit when driven high. Register contents are set to the initial state when driven high. Must be driven low for normal operation. Not internally pulled to supply or ground.

Analog Supply Voltage Input. Bypass to ground with a 1FF capacitor as close as possible to the pin.

Power Amplifier (PA) Positive Output. Requires DC current path to supply voltage through an inductive path. The DC current path can be part of the output impedance matching and harmonic filter network.

Power Amplifier (PA) Negative Output. Requires DC current path to supply voltage through an inductive path. The DC current path can be part of the output impedance matching and harmonic filter network.

Exposed Pad. This is the only ground connection. Solder evenly to the PCB ground plane for proper operation. Multiple vias from the solder pad to the PCB ground plane are recommended.

P-P

to 1.2V

P-P

.

�� Maxim Integrated Products 14

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

Functional Diagram

27 28

PA-

PA+

25

SHDN*

GPO1*

HOP*

GPO2*

SDI

24

23

21

CS

20

19

2

8

REXTPA

CPOUT

PA

/1, /2, OR /3

TEMPERATURE

SENSOR

CHARGE

PUMP

MAX7049

ADC

6

7

DIGITAL CONTROL AND MCU

INTERFACE

6

CTRL

GROUNDED

PAD (EP)

FRACTIONAL-N

DIVIDER

VCO

XTAL OSCILLATOR

XTALC

12 13

Detailed Description

Architectural Overview and

Applications Circuit

The MAX7049 includes a single precision local oscillator fractional-N synthesizer with an integrated VCO, fractional-N divider, phase/frequency detector, charge pump, LO divider, and lock detector. The loop filter is located off-chip to allow the user to optimize the synthesizer noise and transient characteristics for a particular application. In FSK transmit mode, the synthesizer transitions between the mark and the space frequency based on the state of the DATAIN pin or datain bit (Datain register, 0x3D, bit 6). A user-programmable frequency-shaping function enables the user to precisely define the transition from the mark frequency to the space frequency and vice versa to minimize spectral width of the modulated Tx waveform.

The IC utilizes a differential emitter-coupled, dual-opencollector power amplifier for the transmitter output.

SCLK 18

PFD

XTALB

21

* OPTIONAL I/Os FROM/ TO MCU.

DATAIN*

SDO*

17ENABLE*

16

15

The bias current of the output stage is set with a combination of an external resistor and an internal amplitudeshaping function. The programmable shaping function enables the user to precisely define the transition between carrier on and carrier off and vice versa based on the state of the DATAIN pin or datain bit so as to minimize the spectral width of the modulated Tx signal. Linear amplitude ramping is used in FSK mode as the PA is enabled at the beginning of a data burst and disabled at the end of a data burst for spectral control.

A complete transmitter system can be built using a low-end MCU, the IC, a crystal, and a small number of passive components for power-supply bypassing and for RF matching, as illustrated in Figure 2.

Communication between the MCU and the IC is accomplished through a 4-pin SPI bus and a number of optional digital inputs and outputs.

�� Maxim Integrated Products 15

MAX7049

High-Performance, 288MHz to 945MHz

ASK/FSK ISM Transmitter

C13

L1

50I

C20

PAVDD

N.C.

LOVDD

CTRL

CPVDD

1

2

3

4

5

6

7

C14

L2

PA-

+

2728 26 25 24 23 22

J1

C17

R2

L4

C16 C15

V

DD

C1

R1

C2

C3

C4

L3

REXTPA

VCOVDD

PA+

C12

AVDD

MAX7049

GROUNDED

PAD (EP)

DASHED LINES DENOTE OPTIONAL CONNECTIONS

SHDN

GPO1

HOP

DVDD

C11

GPO2

21

CS

20

SDI

19

SCLK

18

ENABLE

17

DATAIN

16

SDO

15

µP

C6

C5

Figure 2. Typical Operating Circuit

�� Maxim Integrated Products 16

CPOUT

98 10

PLLVDD

C7

N.C.

12

11

XOVDD

C8

13 14

XTALB

XTALC

Y1

C9 C10

N.C.

MAXIM MAX7049 Technical data

TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

AC ELECTRICAL CHARACTERISTICS

Typical Operating Characteristics

Pin Configuration

Pin Description

Functional Diagram

Detailed Description