MRF49XAT-I/ST【PDF 82/102 页】IC RF TXRX 433/868/915 16-TSSOP

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MRF49XA

TABLE 5-5:

TRANSMITTER AC CHARACTERISTICS (1)

Parameters

RF Carrier Frequency

Maximum RF Output Power

Condition

433 MHz band, 2.5 kHz resolution

868 MHz band, 5.0 kHz resolution

915 MHz band, 7.5 kHz resolution

433 MHz @ 50 Ω load

Min

430.24

860.48

900.72

—

Typ

—

—

—

7

Max

439.75

879.51

929.27

—

Unit

MHz

MHz

MHz

dBm

868 MHz @ 50 Ω load

915 MHz @ 50 Ω load

RF Output Power Control Range In steps of 8

—

—

P max – 17.5

5

5

—

—

—

P max

dBm

dBm

dBm

TX Gain Control Resolution

Harmonic Suppression

Open-Collector Output DC

Programmed in 8 steps

At maximum power, 50 Ω load

Programmable

—

—

0.5

2.5

—

—

—

-35

6

dB

dBc

mA

Current

Spurious Emission

| f-f sp | > 1 MHz

Output Capacitance (Set by the

Automatic Antenna Tuning

Circuit)

Quality Factor of the Output

Capacitance

Output Phase Noise

FSK Bit Rate

FSK Bit Rate

At maximum power, 50 Ω load

433 MHz band

868 MHz band

915 MHz band

433 MHz band

868 MHz band

915 MHz band

100 kHz from carrier

1 MHz from carrier

Internal TX Data register

TX data connected to the FSK

—

2

2.1

2.1

13

8

8

—

—

—

—

—

2.6

2.7

2.7

15

10

10

-80

-103

—

—

-55

3.2

3.3

3.3

17

12

12

—

—

172

256

dBc

pF

pF

pF

—

—

—

dBc/Hz

dBc/Hz

kbps

kbps

input

FSK Frequency Deviation

Programmable in 15 kHz steps

15

—

240

kHz

Note 1:

Typical Values: T A = 25°C, V DD = 3.3V.

TABLE 5-6:

PLL PARAMETERS AC CHARACTERISTICS (1)

Parameters

PLL Reference Frequency

Condition/Note

Crystal related timing and fre-

Min

9

Typ

10

Max

11

Unit

MHz

quency parameters change

according to the PLL reference

frequency

PLL Lock Time

PLL Start-up Time

Frequency error <1 kHz after

10 MHz step

With a running crystal oscillator

and based on the design

—

—

30

200

—

300

μ s

μ s

Note 1:

Typical Values: T A = 25°C, V DD = 3.3V.

DS70590C-page 82

Preliminary

? 2009-2011 Microchip Technology Inc.

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