MRF49XA-ISLASHT datasheet(82/102 Pages) MICROCHIP

82 / 102 page

MRF49XA

DS70590C-page 82

Preliminary

Note 1: Typical Values: TA = 25°C, VDD = 3.3V.

TABLE 5-6:

PLL PARAMETERS AC CHARACTERISTICS(1)

Note 1: Typical Values: TA = 25°C, VDD = 3.3V.

TABLE 5-5:

TRANSMITTER AC CHARACTERISTICS(1)

Parameters

Condition

Min

Typ

Max

Unit

RF Carrier Frequency

433 MHz band, 2.5 kHz resolution

430.24

—

439.75

MHz

868 MHz band, 5.0 kHz resolution

860.48

—

879.51

MHz

915 MHz band, 7.5 kHz resolution

900.72

—

929.27

MHz

Maximum RF Output Power

433 MHz @ 50

Ω load

—

dBm

868 MHz @ 50

Ω load

—

dBm

915 MHz @ 50

Ω load

—

dBm

RF Output Power Control Range In steps of 8

Pmax – 17.5

—

Pmax

dBm

TX Gain Control Resolution

Programmed in 8 steps

—

2.5

—

Harmonic Suppression

At maximum power, 50

Ω load

—

-35

dBc

Open-Collector Output DC

Current

Programmable

0.5

—

Spurious Emission

| f-fsp | > 1 MHz

At maximum power, 50

Ω load

—

-55

dBc

Output Capacitance (Set by the

Automatic Antenna Tuning

Circuit)

433 MHz band

2.6

3.2

868 MHz band

2.1

2.7

3.3

915 MHz band

2.1

2.7

3.3

Quality Factor of the Output

Capacitance

433 MHz band

—

868 MHz band

—

915 MHz band

—

Output Phase Noise

100 kHz from carrier

—

-80

—

dBc/Hz

1 MHz from carrier

—

-103

—

dBc/Hz

FSK Bit Rate

Internal TX Data register

—

172

kbps

FSK Bit Rate

TX data connected to the FSK

input

—

256

kbps

FSK Frequency Deviation

Programmable in 15 kHz steps

—

240

kHz

Parameters

Condition/Note

Min

Typ

Max

Unit

PLL Reference Frequency

Crystal related timing and fre-

quency parameters change

according to the PLL reference

frequency

910

MHz

PLL Lock Time

Frequency error <1 kHz after

10 MHz step

—30

—

μs

PLL Start-up Time

With a running crystal oscillator

and based on the design

—

200

300

μs

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