MAX1472_05 datasheet(3/9 Pages) MAXIM

3 / 9 page

300MHz-to-450MHz Low-Power, Crystal-Based

ASK Transmitter

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(Typical Application Circuit, output power is referenced to 50

Ω, VDD = 2.1V to 3.6V, VENABLE = VDD, TA = -40°C to +125°C, unless

otherwise noted. Typical values are at VDD = 2.7V, TA = +25

°C, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

PHASE-LOCKED LOOP PERFORMANCE

VCO Gain

330

MHz/V

fOFFSET =100kHz

-84

fRF = 315MHz

fOFFSET = 1MHz

-91

fOFFSET =100kHz

-82

Phase Noise

fRF = 433MHz

fOFFSET = 1MHz

-89

dBc/Hz

fRF = 315MHz

-50

Maximum Carrier Harmonics

fRF = 433MHz

-50

dBc

fRF = 315MHz

-75

Reference Spur

fRF = 433MHz

-81

dBc

Loop Bandwidth

1.6

MHz

Crystal Frequency

fXTAL

fRF / 32

MHz

Oscillator Input Impedance

From each XTAL pin to GND

6.2

Frequency Pushing by VDD

ppm/V

Maximum Crystal Inductance

DIGITAL INPUTS

Data Input High

VIH

VDD- 0.25

Data Input Low

VIL

0.25

Maximum Input Current

2nA

Pulldown Current

µA

Note 1: 100% tested at TA = +25°C. Guaranteed by design and characterization over temperature.

Note 2: 50% duty cycle at 10kHz data.

Note 3: Guaranteed by design and characterization, not production tested.

Note 4: Generally limited by PC board layout.

Note 5: VENABLE < VIL to VENABLE > VIH. fOFFSET is defined as the frequency deviation from the desired carrier frequency.

Note 6: VENABLE > VIH, VDATA > VIH, Efficiency = POUT/(VDD x IDD).

Note 7: VENABLE > VIH, DATA toggled from VIL to VIH, 10kHz, 50% duty cycle, Efficiency = POUT/(VDD x IDD).

Note 8: Output power can be adjusted with external resistor.

Note 9: Guaranteed by design and characterization at fRF = 315MHz.

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