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MRF49XA
REGISTER 2-4:
TXCREG: TRANSMIT CONFIGURATION REGISTER (POR: 0x9800) (CONTINUED)
bit 2-0
Note 1:
2:
OTXPWR<2:0>: Output Transmit Power Range bits (2)
These bits set the transmit output power range. The output power is programmable from 0 dB (Max.)
to -17.5 dB in -2.5 dB steps.
111 = -17.5 dB
110 = -15.0 dB
101 = -12.5 dB
100 = -10.5 dB
011 = -7.5 dB
010 = -5.0 dB
001 = -2.5 dB
000 = 0 dB
The transmitter FSK modulation parameters are used for calculating the resulting output frequency, as
shown in Equation 2-1 .
The output transmit power range is relative to the maximum available power, which depends on the actual
antenna impedance.
EQUATION 2-1:
f FSKOUT = f 0 +[(– 1) SIGN x (MB + 1) x (15 kHz)]
where:
f 0 is the Channel Center Frequency (see Register 2-6 for f 0 Calculation)
MB is the 4-bit Binary Number (MODBW<3:0>)
SIGN = MODPLY XOR FSK
DS70590C-page 24
Preliminary
? 2009-2011 Microchip Technology Inc.
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