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MICRF500
Example 2. f RF = 869.0MHz, f RF = 10.00MHz. FSK modula-
tion is applied to the VCO.
Binary form: (MSB to the left):
Tx: 110010 110010 000010000111
Micrel
Tx
Rx
Tx
Rx
A1
50
50
RxFilt
0
0
Ref6
A0
50
50
Pa2
1
1
Ref5
N1
135
135
Pa1
1
1
Ref4
N0
135
135
Pa0
1
1
Ref3
M1
100
100
Gc
1
1
Ref2
M0
100
100
ByLNA
0
0
Ref1
000010000111 0001100100 0001100100
01011110000000010100000011
Rx: 111011 111011 000010001110
000010001110 0001101010 0001101010
01011110000000010100000001
With modulation applied to the VCO, A, N and M values
corresponding to the receive frequency have to be found. The
same set of A, N and M values are used in all modes.
Programming After Battery Reset
Tx
Rx
Tx
Rx
0
0
Ref0
0
0
OutS1
0 0
0 0
Cpmp1 Cpmp0
0 1
0 1
OutS0 Mod1
0
0
Fc1
1
1
Mod0
0
0
Fc0
0
0
RT
0
0
OutS2
0
0
Pu
In order to ensure a successful programming after V DD has
been zero volts, the P DEXT needs to be kept low during the
first programming sequence. This can be done by a separate
110-line from a microcontroller, or a RC circuit on the P DEXT
pin to V DD (A capcitor between P DEXT and V DD ). Using the
latter method, R and C values need to be chosen so that the
voltage on the P DEXT pin is lower than V DD /2 when the
controller word is loaded into the parallel register (see Figure
Tx
Rx
0
0
0
0
0
0
0
0
1
0
1
1
10).
March 2003
17
MICRF500
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