Datasheet

© 2009-2011 Microchip Technology Inc. Preliminary DS70590C-page 81
MRF49XA
Note 1: Typical Values: TA = 25°C, VDD = 3.3V.
2: BER = 10E – 3, BW = 67 kHz, Δf = 30 kHz, Baud Rate = 1.2 kbps, digital filter with AFC disabled.
TABLE 5-4: RECEIVER AC CHARACTERISTICS
(1)
Parameters Condition Min Typ Max Unit
Receiver Sensitivity 433 MHz band
(2)
—-112—dBm
868 MHz band
(2)
—-110—dBm
915 MHz band
(2)
— -109 — dBm
Maximum RF Input
Power
LNA: High Gain 0 — — dBm
RF Input Capacitance — — 1 — pF
Receiver Spurious
Emission
———-60dBm
Receiver BW mode 0 — 67 — kHz
Mode 1 — 134 — kHz
Mode 2 — 200 — kHz
Mode 3 — 270 — kHz
Mode 4 — 340 — kHz
Mode 5 — 400 — kHz
RSSI Range — — 46 — dB
RSSI Error — — ±6 — dB
RSSI Power Supply
Dependency
When input signal level is lower than
-54 dBm and greater than -100 dBm
—+35—mV/V
Filter Capacitor for
Analog RSSI
—1——nF
RSSI Programmable
Level Steps
——6—dB
Digital RSSI
Response Time
Until the RSSI signal goes high after
the input signal exceeds the
preprogrammed limit, CARRSI = 4.7
nF
— 500 — μs
Input IP3 In band interferers in high bands (868
MHz, 915 MHz)
—-21—dBm
IIP3
(LNA – 6 dB gain)
In band interferers in low band (433
MHz)
—-15—dBm
IIP3
(LNA – 6 dB gain)
Out of band interferers,
l f-f
O l > 4 MHz
—-12—dBm
FSK Bit Rate With internal digital filters supported
by design
0.6 — 115.2 kbps
FSK Bit Rate With internal analog filters supported
by design
——256kbps
AFC Locking Range Δf
fsk: FSK deviation in the received
signal
— 0.8 – Δffsk ——