Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX7058ATG+

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 match-

ing 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 oper-

ation 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

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

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

*EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX7058ATG+ -40°C to +125°C

24 Thin QFN-EP*

(4mm x 4mm)

CAP3

PAOUT

ROUT

N.C.

ENABLE

TOGGLE

N.C.

7 8

CAP1

10 11 12

2324 22 20 19

CAP2

N.C.

XTAL2

AVDD

PAVDD

N.C.

MAX7058

CAP4

DIN

FSEL

XTAL1

DVDD

N.C.

DIGITAL

CONTROL

FREQUENCY

21 OR 26

CRYSTAL

OSCILLATOR

CHARGE

PUMP

PFD

LOOP

FILTER

ENVELOPE

SHAPING

EXPOSED

PADDLE

(GND)

VCO

MAX7058

7 8 9 10

TQFN

11 12

24 23 22 21 20 19

N.C.

FSEL

DVDD

CAP1

N.C.

CAP3

CAP4

PAOUT

ROUT

N.C.

ENABLE

TOGGLE

N.C.

CAP2

N.C.

XTAL2

XTAL1

AVDD

N.C.

PAVDD

DIN

TOP VIEW

*EP = EXPOSED PADDLE.

EP*

MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter

19-3206; Rev 1; 7/14

Functional Block DiagramPin Conguration

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (13 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter 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.
PAGE 2
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter Absolute Maximum Ratings 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 (TA = +70°C) 24-Pin TQFN (derate 20.8mW/°C above +70°C)......1666.7mW Operating Temperature..................................... -40°C to +125°C Storage Temperature..................................
PAGE 3
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter AC Electrical Characteristics (Typical Operating Circuit, 50Ω system impedance, VAVDD = VDVDD = VPAVDD = +2.1V to +3.6V, fRF = 315MHz or 390MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VAVDD = VDVDD = VPAVDD = +2.7V, TA = +25°C, unless otherwise noted. All min and max values are 100% tested at TA = +125°C, and guaranteed by design and characterization over temperature, unless otherwise noted.
PAGE 4
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter AC Electrical Characteristics (continued) (Typical Operating Circuit, 50Ω system impedance, VAVDD = VDVDD = VPAVDD = +2.1V to +3.6V, fRF = 315MHz or 390MHz, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VAVDD = VDVDD = VPAVDD = +2.7V, TA = +25°C, unless otherwise noted. All min and max values are 100% tested at TA = +125°C, and guaranteed by design and characterization over temperature, unless otherwise noted.
PAGE 5
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 15 14 13 TA = +25°C 12 TA = -40°C 11 2.5 2.7 2.9 3.1 3.3 3.5 TA = +85°C 13 TA = +25°C 12 TA = -40°C 10 3.1 9 3.6 2.6 2.1 3.1 3.6 SUPPLY CURRENT vs. OUTPUT POWER TA = -40°C 14 10 8 315MHz AND 390MHz 6 4 2.6 3.1 ON 6 4 50% PA 2.1 2.6 3.1 0 3.6 -40 -30 -20 -10 0 10 OUTPUT POWER (dBm) SUPPLY CURRENT vs. OUTPUT POWER PHASE NOISE vs.
PAGE 6
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) -47.5 -48.0 -48.5 -49.0 -49.5 2.6 3.1 3.6 24 TA = +85°C 22 20 18 16 TA = +125°C 14 12 2.1 2.6 3.1 10 3.6 2.1 2.4 2.7 3.0 3.3 EFFICIENCY vs. SUPPLY VOLTAGE EFFICIENCY vs. SUPPLY VOLTAGE EFFICIENCY vs. SUPPLY VOLTAGE 24 22 25 TA = +85°C 2.4 2.7 20 18 16 14 TA = +125°C TA = +85°C 12 3.0 SUPPLY VOLTAGE (V) www.maximintegrated.
PAGE 7
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter Pin Description PIN NAME 1, 6, 7, 12, 13, 18, 19, 24 N.C. 2 DVDD Digital Positive Supply Voltage. Bypass to GND with 0.1µF and 0.01µF capacitors placed as close to the pin as possible. 3 FSEL Frequency Select. Internally pulled down to GND when the part is not in standby mode. Set FSEL = 0/ TOGGLE = 0 to select continuous 390MHz, and FSEL = 1/TOGGLE = 0 to select continuous 315MHz. See Table 1 for detailed mode description.
PAGE 8
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter Detailed Description resolution of 0.5pF. When the MAX7058 operates at 315MHz, the capacitance added at PAOUT corresponds to the setting at CAP1–CAP4, as seen in Table 2. When the MAX7058 operates at 390MHz, the MAX7058 does not add any internal shunt capacitance at PAOUT.
PAGE 9
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter Operating Mode CASE 1: DIN PIN ONLY USED TO POWER UP THE MAX7058 TOGGLE and FSEL are two pins available for controlling the state of the toggle mode and the operating frequency. The following truth table defines the pin logic for the four possible operating states. Table 1.
PAGE 10
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter When the particular capacitance control input pin is high, then the corresponding amount of capacitance is added at PAOUT; this capacitance tuning works only at 315MHz. The 16 capacitor values are selected by setting CAP1–CAP4; the capacitance resolution is 0.5pF. The total capacitance varies from 0 to 7.5pF. For example, if CAP1 and CAP3 are high and CAP4 and CAP2 are low when operating at 315MHz, then this circuit will add 2.5pF at PAOUT. Table 2.
PAGE 11
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter Applications Information Output Matching to 50Ω When matched to a 50Ω system, the MAX7058’s PA is capable of delivering +10dBm of output power at VDD = +2.7V. The output of the PA is an open-drain transistor, which has internal selectable shunt tuning capacitors for impedance matching (see the Variable Capacitor section). It is connected to VDD through a pullup inductor for proper biasing.
PAGE 12
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter Typical Operating Circuit CAP4 CAP3 CAP2 CAP1 FSEL 5 8 L1 22nH RFOUT C3 10pF C2 10pF VDD 9 C1 8.2pF 10 L2 18nH C5 680pF R1 0 FSEL DVDD CAP3 11 2 C12 0.01F CAP4 C13 0.1F PAOUT DIN C4 220pF C6 0.01F VDD 3 CAP1 MAX7058 14 C7 220pF 4 CAP2 ROUT PAVDD VDD EXPOSED PADDLE AVDD C8 0.1F 21 20 DIN ENABLE TOGGLE 17 16 C10 100pF C9 0.01F TOGGLE XTAL1 XTAL2 15 ENABLE 22 XTAL C12 3.9pF C11 100pF C13 3.
PAGE 13
MAX7058 315MHz/390MHz Dual-Frequency ASK Transmitter Revision History REVISION NUMBER REVISION DATE 0 1/08 Initial Release — 1 7/14 Removed automotive reference from data sheet 1 DESCRIPTION PAGES CHANGED For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.