MRF89XAM8A-I Datasheet, PDF (49/140 Pages) Microchip Technology – Ultra Low-Power, Integrated ISM Band Sub-GHz Transceiver

MRF89XA
2.18 Transmitter Configuration
Registers
2.18.1
TRANSMIT PARAMTER
CONFIGURATION REGISTER
DETAILS
REGISTER 2-27: TXCONREG: TRANSMIT PARAMETER CONFIGURATION REGISTER
(ADDRESS:0x1A) (POR:0x7C)
R/W-0
R/W-1
R/W-1
R/W-1
R/W-1
R/W-1
R/W-0
TXIPOLFV<3:0>
TXOPVAL<2:0>
bit 7
r
—
bit 0
R = Readable bit
-n = Value at POR
r = Reserved
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-4
bit 3-1
bit 0
TXIPOLFV<3:0>: Transmission Interpolation Filter Cut Off Frequency Value bits
These bits control the cut-off frequency (f_c) of the interpolation filter in the transmission path.
TXIPOLFV<3:0> = 0111 Î f_c = 200 kHz (default)
f_c
=
200
kHz^∗
⎛
⎝
1-^{f--x-2-t--.a-8-l--MM-----H-}H^{----zz-⎠⎞}
∗⎛
⎝
v_----a_---l_--(_--T_----X_----I_--8P_----O_-----L_----F_----V_----)⎠⎞
Where,
TXIPOLFV <3:0> is the value in the register
f_c is the cut-off frequency
f_o is the local oscillator frequency (center frequency)
f_xtal is the crystal oscillator frequency
TXOPVAL<2:0>: Transmit Output Power Value bits (1 step ≈ 3dB)
111 = -8 dBm
110 = -5 dBm
101 = -2 dBm
100 = 1 dBm
011 = 4 dBm
010 = 7 dBm
001 = 10 dBm (default)
000 = 13 dBm
Reserved: Reserved bit; do not use
0 = Reserved (default)
© 2010–2011 Microchip Technology Inc.
Preliminary
DS70622C-page 49