micrf501 Micrel Semiconductor, micrf501 Datasheet - Page 17

• Manufacturer Part Number: micrf501
• Description: 300mhz To 600mhz Radiowire? Rf Transceiver
• Manufacturer: Micrel Semiconductor

Example 2. f
lation is applied to the VCO.
March 2003
MICRF501
Rx
Rx
Rx
Rx
Rx
Tx
Tx
Tx
Tx
Tx
OutS1
RxFilt
Ref6
Ref0
A1
27
27
0
0
0
0
0
0
0
0
RF
= 434.245MHz, f
Cpmp1 Cpmp0
OutS0
Ref5
Pa2
A0
27
27
1
1
0
0
0
0
0
0
Mod1
Ref4
Pa1
143
143
N1
1
1
0
0
1
1
0
0
RF
= 10.00MHz. FSK modu-
Mod0
Ref3
Pa0
143
143
Fc1
N0
1
1
0
0
1
1
0
0
Ref2
106
106
Fc0
M1
RT
Gc
1
1
0
0
0
0
1
0
ByLNA
OutS2
Ref1
106
106
M0
Pu
0
0
0
0
0
0
1
1
17
Binary form: (MSB to the left):
Tx:
Rx:
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
In order to ensure a successful programming after VDD has
been zero volts, the PDEXT needs to be kept low during the
first programming sequence. This can be done by a seperate
I/O-line from a microcontroller, or a RC circuit on the PDEXT
pin to the VDD (a capacitor between PDEXT and ground and
a resistor between PDEXT and VDD). Using the latter method,
R and C values need to be chosen so that the voltage on the
PDEXT pin is lower then VDD/2 when the control word is
loaded into the parallel register. (See Figure 10.)
011011 011011 000010001111
000010001111 0001101010 0001101010
011110000000001100000011
011011 011011 000010001111
000010001111 0001101010 0001101010
011110000000001100000001
MICRF501
Micrel